The differential equations applicable to the film thickness beneath an infinitely wide, perfectly flexible self-acting tape are derived in the paper. Accurate numerical solutions are obtained for the film thickness in both the entrance and exit regions. T...

In this paper, the natural frequencies and mode shapes of a cracked beam are obtained using the finite element method. An `overall additional flexibility matrix', instead of the `local additional flexibility matrix', is added to the flexibility matrix of the corresponding intact beam element to obtain the total ...

Compared with the widely used straight front crack model, an elliptical front crack has been found to be more accurate and realistic for modeling the transverse surface crack in rotating machinery. Therefore, based on the strain energy release rate (SERR) approach and the closed-form results of SIFs, the local flexibilities of an elliptical cracked shaft ...

A simple, flexible, accurate, and comprehensive numerical method is presented for theoretically analyzing the diffraction field of a continuous wave transducer of arbitrary size, shape, and frequency. Using the extensively studied circular transducer for comparison, numerical results are shown for an unfocused ...

A computational procedure for extracting substructure-by-substructure flexibility properties from global modal parameters is presented. The present procedure consists of two key features: an element-based direct flexibility method which uniquely determines the global flexibility without resorting to case-dependent redundancy ...

... Title : NUMERICAL STUDY OF SECONDARY EFFECTS IN FLEXIBILITY ANALYSIS OF AN ELL-SHAPED PIPING STRUCTURE. ...

... Descriptors : *FLEXIBLE STRUCTURES, *MATHEMATICAL MODELS, NUMERICAL ANALYSIS, SCALE, STABILITY, SIMULATION, STRUCTURES. ...

NOVEL METHOD FOR NUMERICALLY ACCURATE ANALYSIS OF PRINTED ROTMAN LENS ANTENNAS ... specific geometry of the printed lens. ...

... Accession Number : ADA051736. Title : An Efficient, Accurate Numerical Method for the Solution of a Poisson Equation on a Sphere. ...

... Accession Number : ADA003458. Title : An Accurate Economical Numerical Radiation Transport Algorithm. Descriptive Note : Memorandum rept.,. ...

The Analytical Equation of State (ANEOS) is a useful computer code to generate equations of state (EOS) for rocks and minerals. An accurate EOS is one of essential points necessary for the numerical modeling of impact events. We analyze here a possibility to use a "standard" ANEOS in a "non-standard" way to make more flexible the ...

A linear scaling approach for general and accurate pseudopotential Density Functional Theory calculations is presented. It is based on a Finite Difference discretization. Effective O(N) scaling is achieved by confining the orbitals in spherical localization regions. To improve accuracy and flexibility while computing the smallest possible number of ...

... Computerized simulation, *Numerical methods and procedures, Turbomachinery, Compressible flow, Supercritical flow, Algorithms, ...

Accurate rotordynamic analysis is critical in the achievement of efficient rotary machine design, however the majority of models concern flexible shafts with concentrated supports. The modified Euler equations of motion are used in a numerical model to calculate the natural frequencies and whirl amplitudes of a rigid rotor supported by ...

... Accession Number : ADP003396. Title : Low Authority Control of Flexible Spacecraft via Numerical Optimization,. Corporate ...

Flexible robot manipulators have numerous advantages over their rigid counterparts. They have increased payload-to-weight ratio, they run at higher speeds, use less energy and smaller actuators, and they are safer during interaction with their environments. On the other hand, light design combined with external effects result in components which can ...

... Title : Numerical Optimization, System Theoretic and Software Tools for the Integrated Design of Flexible Structures and their Control Systems. ...

... Title : Numerical Optimization, System Theoretic and Software Tools for the Integrated Design of Flexible Structures and Their Control Systems. ...

... numerical generation of boundary conforming curvilinear coordinate systems ... NUMERICAL ANALYSIS, GRIDS(COORDINATES), NAVIER STOKES ...

Hydraulic models of circulation are used to test mechanical heart assist devices and for research and training purposes. However, when compared with numerical models, they are rather expensive and often not sufficiently flexible or accurate. Flexibility and accuracy can be improved by merging ...

... (AN). Descriptors : *MATHEMATICAL MODELS, *STRUCTURAL MECHANICS, *FLEXIBLE STRUCTURES, ALGORITHMS, COMPUTERIZED ...

... Descriptors : *FLEXIBLE STRUCTURES, *DIGITAL SIMULATION, *MATHEMATICAL MODELS, FLOATING BODIES, FRAMES, DYNAMICS ...

A detailed numerical investigation of the coupling between the vibration of a flexible plate and the

A detailed numerical investigation of the coupling between the vibration of a flexible plate and the

flexible chemical reactions and kinetics; ... Details of the physical and numerical features of the code will be presented with special emphasis on the ...

The simulation of the dynamic behavior of flexible structures with impact, is experimentally and numerically investigated. A radially rotating flexible beam attached to a rigid shaft is considered. Both experimental and numerical studies are undertaken. E...

The present investigation is concerned with a fourth order accurate finite difference method and its

Risk based inspection strategies rely on detailed knowledge of the performance of inspection techniques. The objective of the ``POD generator'' project is to develop a numerical modeling approach to assess the effectiveness of specific inspection techniques. Simulation offers flexibility and reliability at acceptable costs. Therefore ...

Collective motions on ns-?s time scales are known to have a major impact on protein folding, stability, binding and enzymatic efficiency. It is also believed that these motions may have an important role in the early stages of prion protein misfolding and prion disease. In an effort to accurately characterize these motions and their potential influence on the misfolding and ...

Annular subaperture interferometry (ASI) has been developed for low cost and flexible test of rotationally symmetric aspheric surfaces, in which accurately combining the subaperture measurement data corrupted by misalignments and noise into a complete surface figure is the key problem. By introducing the Zernike annular polynomials which are orthogonal ...

A new analytical method is developed for transient vibration analysis of stepped systems composed of distributed components like elastic bars, flexible shafts and taut strings, and lumped masses. The method, with a distributed transfer function formulation and a residue formula for inverse Laplace transform, gives the exact transient response of a stepped system with any ...

Significant sensitivity variations among cell-phone camera modules have been observed. As a result, for an effective and reliable white balancing, per-module RGB-ratios calibration/estimation under various illumination conditions is required. Herein, a new technique is proposed which minimizes/simplifies RGB-ratios calibration/estimation process. The proposed method could be based on either direct ...

Oscillating flexible and rigid flat plates are studied with a combination of numerical simulations and experimental measurements. Visualization data and numerical simulations are used to classify the principal characteristics in the wake of the plates. Visualization data for each plate shows distinct differences between when and how ...

Falling films have a long history and modern advances in the theory have led to accurate modelling for flows down rigid inclines. We now consider the possible effects that can be introduced by flexible substrates. In this work, we derive Benney-like coupled equations for the film thickness and substrate deflection using long-wave theory. Weakly nonlinear ...

Numerous transcription factors self-assemble into different order oligomeric species in a way that is actively regulated by the cell. Until now, no general functional role has been identified for this widespread process. Here, we capture the effects of modulated self-assembly in gene expression with a novel quantitative framework. We show that this mechanism provides precision ...

Numerous transcription factors self-assemble into different order oligomeric species in a way that is actively regulated by the cell. Until now, no general functional role has been identified for this widespread process. Here, we capture the effects of modulated self-assembly in gene expression with a novel quantitative framework. We show that this mechanism provides precision ...

The time history of local flexibilities associated with a breathing crack in a rotating shaft is the concern of this paper. Considering quasi-static approximation, the deflections of a circular cross-section beam presenting a crack of different depths, due to bending or torsion loads are analyzed with the aid of a refined nonlinear contact-finite element procedure in order to ...

... Abstract : The objective of this research project was to derive and evaluate accurate and efficient numerical solution algorithms for the three ...

... of numerical methods capable of yielding accurate solutions of the kinetic ... The free polecule solution to the circular cylinder problem has �. ...

... This improved numerical method permits finer mesh sizes and consequently, more accurate stress wave propagation simulations are possible. ...

In this paper, an efficient and accurate numerical procedure to determine the thermo-hydrodynamic performance of cavitating bearings is described. ...

A method has been developed to reduce numerical stiffness and computer CPU requirements of high fidelity multibody flight simulations involving parachutes for planetary entry trajectories. Typical parachute entry configurations consist of entry bodies suspended from a parachute, connected by flexible lines. To accurately calculate line ...

Three broad areas of concern in the development of aquifer scale transport models will be local scale diffusion and dispersion processes, regional scale dispersion processes, and numerical problems associated with the advection-dispersion equation. Local scale dispersion processes are fairly well understood and accessible to observation. These processes will generally be ...

Qualitative description has generally been viewed as the "poor cousin" to more developed qualitative methods, such as grounded theory. As such, little has been written about rigor in qualitative description, and researchers lack a navigational map to guide them and facilitate decision making. The novice, in particular, can be faced with numerous challenges and uncertainties. ...

A parallel, time-accurate flow solver is devised to study the human cardio-vascular system. The solver is capable of dealing with moving boundaries and moving grids. It is designed to handle complex, three-dimensional vascular systems. The computational domain is divided into multiple block subdomains. At each cross section the plane is divided into twelve sub-zones to allow ...

This paper considers the combined use of a hybrid numerical method for the modeling of acoustic mufflers and a genetic algorithm for multiobjective optimization. The hybrid numerical method provides accurate modeling of sound propagation in uniform waveguides with non-uniform obstructions. It is based on coupling a wave based modal ...

We propose a simple rubber friction law, which can be used, for example, in models of tire (and vehicle) dynamics. The friction law is tested by comparing numerical results to the full rubber friction theory (Persson 2006 J. Phys.: Condens. Matter�18�7789). Good agreement is found between the two theories. We describe a two-dimensional (2D) tire model which combines the ...

We propose a simple rubber friction law, which can be used, for example, in models of tire (and vehicle) dynamics. The friction law is tested by comparing numerical results to the full rubber friction theory (Persson 2006 J. Phys.: Condens. Matter 18 7789). Good agreement is found between the two theories. We describe a two-dimensional (2D) tire model which combines the ...

Identifying the origins of the large propagation losses in substrate-type photonic crystal waveguides and subsequently reducing them by means of structural optimization requires a numerical model, which is flexible and accurate enough to allow a quantitative comparison. In this article we discuss the applicability of the cutback-method ...

Numerical models were developed to simulate temperature profiles in Newtonian fluids during continuous flow microwave heating by one way coupling electromagnetism, fluid flow, and heat transport in ANSYS 8.0 and COMSOL Multiphysics v3.4. Comparison of the results from the COMSOL model with the results from a pre-developed and validated ANSYS model ensured accuracy of the ...

We present a numerical procedure using the PN-method to model light distributions in layered structures such as the epithelium. In contrast to previous studies of layered media using Monte Carlo methods and discrete ordinates, the PN-method provides the flexibility to not only vary tissue optical properties across layers but also allows one to vary the ...

A finite element formulation for the dynamic response of gear pairs is proposed. Following an established approach in lumped parameter gear dynamic models, the static solution is used as the excitation in a frequency domain solution of the finite element vibration model. The nonlinear finite element/contact mechanics formulation provides accurate calculation of the static ...

This paper presents a practical numerical method for incompressible flows by combining the concept of the CIP method and the finite volume formulation. The method, namely VSIAM3 (Volume/Surface Integrated Average based Multi-Moment Method), employs two integrated averages, i.e. Volume Integrated Average (VIA) and Surface Integrated Average (SIA) which are generically called ...

... The finite-element method is very powerful and flexible to model complex ... the region of interest can be subdivided into finite elements accurately. ...

The development of accurate numerical model of the atmospheric general circulation experiment (AGCE)

The key to weather prediction lies in accurately measuring these variables and feeding the data into numerical models that can predict changes in the ...

An efficient numerical technique to produce accurate solutions to the equations of fluid dynamics is

Application of modular control techniques to the attitude control of a prototype flexible spacecraft and a prototype flexible space platform was further developed by determining numerical values for the physical parameters of a four body approximation of ...

We continue the program of constructing, within the effective-one-body (EOB) approach, high-accuracy, faithful analytic waveforms describing the gravitational wave signal emitted by inspiralling and coalescing binary black holes. We present the comparable-mass version of a new, resummed 3 post-Newtonian (PN) accurate EOB quadrupolar waveform that we recently introduced in the ...

A multibody system consisting of rigid bodies, flexible bodies and various joints is called a flexible multibody system. When constructing a numerical model of a flexible multibody system, the simulation tool needs to be able to adequately represent the physical characteristics of the system. In particular, ...

The classic spectral element method (SEM) is important for seismographical simulation. However, waves subjected to irregular interfaces or surfaces are difficult to simulate accurately using SEM with quadrangular/hexahedral elements. In this paper we propose a new technique to solve this problem. The technique reconstructs some new elements near the surface/interface to ...

The context of this paper is the development of a general and efficient numerical haemodynamic tool to help clinicians and researchers in understanding of physiological flow phenomena. We propose an accurate one-dimensional Runge-Kutta discontinuous Galerkin (RK-DG) method coupled with lumped parameter models for the boundary conditions. The suggested ...

Most of the numerical schemes commonly used for solving the scalar advection equation are not simultaneously: positive definite, high accurate, mass conserving and monotone. Semi Lagrangian numerical schemes derived by van Leer (1977a, b) and Colella and ...

Risk based inspection strategies rely on detailed knowledge of the performance of inspection techniques. It is well known that every inspection technique has limitations in terms of reliability and effectiveness. Moreover, these are influenced by many factors. E.g. it depends on operator skills, inspection procedure, defect and object geometry as well as technique specific instrument properties ...

Discontinuous Galerkin (DG) method is known to have several advantages for flow simulations, in particular, in flexible accuracy management and adaptability to mesh refinement. In the present work, the DG method is developed for numerical simulations of both temporally and spatially developing mixing layers. For the temporally developing mixing layer, both ...

This paper summarizes the achievements obtained so far in the context of a research project carried out at the University of Aveiro, Portugal on both numerical and experimental viewpoints concerning Single Point Incremental Forming (SPIF). On the experimental side, the general guidelines on the development of a new SPIF machine are detailed. The innovation features are related ...

We present a numerical technique for modelling elastic-wave propagation in 3-D media with discrete distributions of 2-D fractures. The scheme treats the fractures as the non-welded interfaces that satisfy the linear-slip displacement-discontinuity conditions, instead of using the equivalent medium theories. We develop the scheme following a so-called 3-D grid method. The key ...

This thesis is concerned with the efficient numerical simulation of finite element based flexible multibody systems. Scaling operations are systematically applied to the governing index-3 differential algebraic equations in order to solve the problem of ill conditioning for small time step sizes. The importance of augmented Lagrangian terms is ...

A rotor-stator model of a turbogenerator is introduced in order to investigate speed transients with rotor-to-stator rubbing caused by an accidental blade-off imbalance. In order to assess the angular deceleration of the rotor due to rubbing, the angular position of its cross-section is considered as an unknown of the problem. Displacement fields are discretized through a finite element ...

Jan 18, 2005 ... The goal of this proposal is the development of the first flexible, multi-scale numerical, dynamical model of planetary atmospheres - and ...

... CURVATURE, TRAJECTORIES, NUMERICAL INTEGRATION, PEAK VALUES, RIGIDITY, QUADRATIC EQUATIONS, THESES, CONTROL ...

... The physical and chemical flexibility of SP processes offers numerous opportunities for the controlled synthesis of advanced ceramic powders and ...

... Corporate Author : INDIAN INST OF SCIENCE BANGALORE DEPT OF AEROSPACE ... coupling the fluid and structure dynamics shows that high ...

Assembly of the Space Station requires numerous construction flights by the Space Shuttle. A particularly challenging problem is that of control of each intermediate station configuration when the shuttle orbiter is approaching it to deliver the next component. The necessary braking maneuvers cause orbiter thruster plumes to impinge on the station, especially its solar arrays. ...

Presented here is a camera-based noncontact measurement theory for static/dynamic testing of flexible multibody systems that undergo large rigid, elastic and/or plastic deformations. The procedure and equations for accurate estimation of system parameters (i.e. the location and focal length of each camera and the transformation matrix relating its image ...

... Scheme for the Dynamic Response of Non-Linear Crush Zone Type ... accurate solutions for different boundary conditions. ... in the numerical solution. ...

Several examples of probabilistic models often used to analyze fault trees, common mode failures, and decision trees are discussed to show that each is a special case of a general model. The general model is PAR (Probabilistic Analysis of Risks), and its use enhances the understanding and interpretation of this type of analysis. Experience with this method of analysis over the past few years has ...

A new numerical integration procedure for exchange-correlation energies and potentials is proposed and ``proof of principle'' results are presented. The numerical integration grids are built from sparse-tensor product grids (constructed according to Smolyak's prescription [Dokl. Akad. Nauk. 4, 240 (1963)] ) on the unit cube. The grid on the unit cube is ...

Binary black hole coalescence is treated semianalytically by a novel approach. Our prescription employs the conservative Skeleton Hamiltonian that describes orbiting Brill-Lindquist wormholes (termed punctures in numerical relativity) within a waveless truncation to the Einstein field equations [G. Faye, P. Jaranowski, and G. Schaefer, Phys. Rev. D 69, 124029 (2004)]. We ...

We consider the free energy of confinement for a flexible self-avoiding polymer inside a spherical cavity. Accurate numerical calculations allow us to arbitrate between competing scaling predictions. We find that, for moderate confinement, the free energy exhibits a power-law dependence on cavity size that is different from what is ...

The Global Theater Weather Analysis and Prediction System (GTWAPS) is intended to provide war fighters and decision makers with timely, accurate, and tailored meteorological and oceanographic (METOC) information to enhance effective employment of battlefield forces. Of critical importance to providing METOC theater information is the generation of meteorological parameters ...

The detection and identification of structural damage is important in monitoring of structural systems during their lifetime. Many researchers have proposed a variety of damage evaluation methods based on structural monitoring. The stiffness matrix is used in some conventional damage detection methods; however, it leads to inevitable error due to the lack of data provided by structural monitoring. ...

The numerical advantage of quantum Monte Carlo simulations of rigid bodies relative to the flexible simulations is investigated for some simple systems. The results show that if high frequency modes in molecular condensed matter are predominantly in the ground state, the convergence of path integral simulations becomes nonuniform. Rigid body quantum ...

The mathematical background for a multiport-network-solving program is described. A method for accurately numerically modeling an arbitrary, continuous, multiport transmission line is discussed. A modification to the transmission-line equations to accommodate multiple rf drives is presented. An improved model for the radio-frequency quadrupole (RFQ) ...

Compared with the widely used straight front crack model, an elliptical front crack has been found to be more accurate and realistic for modeling the transverse surface crack in rotating machinery. When the shaft rotates, the elliptical crack opens and closes alternatively, due to gravity, and thus a "breathing effect" occurs. This variance in shaft stiffness is time-periodic, ...

A surface integral formulation for light scattering on periodic structures is presented. Electric and magnetic field equations are derived on the scatterers' surfaces in the unit cell with periodic boundary conditions. The solution is calculated with the method of moments and relies on the evaluation of the periodic Green's function performed with Ewald's method. The accuracy of this approach is ...

This paper deals with the analysis of the vibrations induced on the carbody of a rail vehicle by track unevenness. Attention is focused on the excitation mechanism of the carbody vibration modes, which has a strong influence on the vehicle's comfort. At first the problem is investigated through a simple three-degree-of-freedom analytical model, and the phenomenon of the critical velocities is ...

A semi-analytical, semi-numerical method of seismogram synthesis is presented for piecewise heterogeneous media resulting from an arbitrary source. The method incorporates the discrete wavenumber Green's function representation into the boundary-volume integral equation numerical techniques. The presentation is restricted to 2-D antiplane motion (SH ...

We present an accurate approximation of the full gravitational radiation waveforms generated in the merger of noneccentric systems of two nonspinning black holes. Utilizing information from recent numerical relativity simulations and the natural flexibility of the effective-one-body (EOB) model, we extend the latter so that it can ...

In this work, we have theoretically analyzed and numerically evaluated the accuracy of high-order lattice Boltzmann (LB) models for capturing non-equilibrium effects in rarefied gas flows. In the incompressible limit, the LB equation is shown to be able to reduce to the linearized Bhatnagar-Gross-Krook (BGK) equation. Therefore, when the same Gauss-Hermite quadrature is used, ...

A piping system analysis is accurate only to the extent that the flexibilities of all portions of the piping system are accurately known. The use of a ''conservative'' flexibility factor is not possible because such a factor cannot be defined. Branch connections require a ...

Jun 16, 2011 ... Description: A numerical model capable of accurately predicting the preference for landscape photographs of selected points in eastern ...

Jun 27, 2011 ... Subject Category: NUMERICAL ANALYSIS ... NUMERICAL ANALYSIS. Subject Terms ALGORITHMS. DIFFERENTIAL EQUATIONS. DIFFUSION. EIGENVALUES ...

An accurate and efficient numerical method based on the rigorous Sommerfeld theory is described for modeling antennas near an interface such as the ground. The Sommerfeld integrals are evaluated by numerical integration along contours in the complex plane...

The results of numerical calculations of the evolution of Neutron Star (NS) in close binaries are presented. The detailed analysis of the NS evolution uses accurate evolutionary tracks for optical companion. By using less accurate evolutionary tracks for ...

The need for efficient and accurate methods for the solution of boundary value problems such as Poisson-type equations is well established. In numerical weather prediction where solutions to such equations are required in daily routine operations, it is p...

A new method has been presented for accurate and stable numerical solutions of ordinary differential equations. Applied to the Schrodinger equation the two essential features of the method are (a) simultaneous Taylor expansions between space steps delta r...

The goal of this research is to design a controller for multi-link flexible robots that ensures accurate joint trajectory tracking and fast vibration damping. This research follows two methods, theoretical and experimental. The theoretical approach compri...

Flexible risers have been used in offshore petroleum production for several years, and a breakthrough is also seen for application in the hostile North Sea environment. The need for efficient and accurate methods for load effect analysis is obvious, and s...

The study deals with the development of a methodology for predicting the amount of useful life remaining in flexible pavements exposed to the effects of traffic, age and environment. Such a methodology is considered necessary if accurate predictive models...

Laser beam positioning and beam rider modules were incorporated into the long hollow flexible segment of an articulated robot manipulator (ARM). Using a single laser beam, the system determined the position of the distal ARM endtip, with millimetric preci...

The behavior of flexible-wall, volume-resonator acoustic filters in liquid-filled pipes can be predicted accurately over a wide frequency range by means of existing theory. However, for design purposes, a simple method for the selection of the major param...

Light and flexible rotating parts of modern turbine engines operating at supercritical speeds necessitate application of more accurate but rather computationally expensive 3D FE modeling techniques. Stacked disks misalignment due to manufacturing variability in the geometry of individual components constitutes a particularly important aspect to be included ...

Due to the inherent flexibility of engineering structures, transient and residual vibrations occur when a motion command is applied, thus raising several practical restrictions concerning their fast, accurate and safe motion. Although various command-preconditioning techniques have been proposed for the effective suppression of the excited vibrations, ...

Bevel-tip flexible needles have greater mobility than straight rigid needles, and can be used to reach targets behind sensitive or impenetrable areas. Accurately planning and executing the optimal motions for such steerable needles is difficult, however, and requires solving inverse kinematics for a nonholonomic system.This paper presents an approach to 3D ...

In a dynamic system, estimation of the system model parameters from the experimental force-response measurements is generally termed as the identification. The present paper proposes a general identification algorithm to estimate crack flexibility coefficients and the crack depth based on the force-response information. The algorithm uses the standard dynamic reduction scheme ...

Large- and medium-scale computational molecular biology projects require accurate bioinformatics software and numerous heterogeneous biological databanks, which are distributed around the world. BioMAJ provides a flexible, robust, fully automated environment for managing such massive amounts of data. The JAVA application enables ...

... Simulation of the above implies numerical solution of the Schroedinger equation, using algorithms and methods, which give accurate results. ...

... In this report, as a start, two accurate general purpose approaches are presented for the solution of variable coefficient parabolic wave equations. ...

... Abstract : An accurate technique to measure the complex permittivity of materials ... the development of models to predict the dielectric parameters of ...

... in the development of appropriate variational formulations, and then inventing stable and accurate discretizations based on the variational methods ...

... A name; a system of terms used in ... ensure compatibility of numerous information systems within CDER ... and accurate, comprehensive retrieval of data ...

The development of high-order accurate numerical discretization techniques for irregular domains and

ACCURATE numerical simulation of the aerodynamics and aeroacoustics of a helicopter is a ... three-dimensional transonic aerodynamic phenomena and complex ...

A new numerical algorithm, ``Vorticity Confinement,'' is proposed to accurately and economically compute vortices produced by aircraft. ...

A new numerical algorithm, "Vorticity Confinement" is proposed to economically and accurately compute the generation and evolution of trailing vortices in ...

accurate numerical solution requires artificial boundary conditions which simulate the propagation of nonlinear waves in open domains. ...

The literature available on this suggests that an accurate numerical solution requires artificial boundary conditions which simulate the propagation of ...

... For pedagogical purposes, the two-particle case is presented and the numerical dispersion of the simulated wave packets is compared with the ...

A new class of piecewise linear methods for the numerical solution of the one- dimensional Euler equations of gas dynamics is presented. ...

... This paper models the equilibrium solutions for a laser ... the peak density, velocity, and temperature of the ... and the distance to the critical surface on ...

A nonlinear aeroelastic analysis that couples a nonlinear structural model with an Euler/Navier-Stokes flow solver is developed for flexible high aspect ratio wings. To model the nonlinear structural characteristics of flexible high aspect ratio wings, a two-dimensional geometric nonlinear methodology, based on a 6 degree-of-freedom (DOF) beam finite ...

LSENS is a flexible, convenient, accurate, and efficient solver for chemical reaction problems such as static system; steady, one-dimensional, inviscid flow ...

Provides access to key solar system data and flexible production of highly accurate ephemerides for solar system objects (163000+ asteroids and comets, ...

... of applications require accurate detection and characterization of persons, human measurement and signature intelligence (H-MASINT), and SAR ...

Feb 14, 2011 ... Maximized flexibility and control: Each hierarchical segmentation level has a ... The software accurately maintains image region boundaries ...

The post exposure bake (PEB) of a chemically amplified resist is one of the key processes for fabricating very small features of semiconductor devices. The use of photogenerated acid enables the de-protection of protected polymers, and this de-protection highly depends on PEB temperature and time. The diffusion length of acid is also strongly dependent on PEB temperature and time. As the line ...

An important task for stereo vision is camera calibration, whose goal is to obtain the intrinsic and extrinsic parameters of each camera. This paper proposes a new accurate calibration method with multilevel process of camera parameters. In order to improve the calibration accuracy, a sub-pixel corner detection method is presented. We start with several views of a planar ...

A wide range of software now exists for the design and simulation of photonic crystals. The sophistication and high performance specifications of many photonic crystal devices mean that techniques must typically not only provide accurate vector results, or at least a reliable error estimate, but also be able to deal with multi-scale problems, intricate materials properties ...

The eigensolutions and associated eigensensitivities of an analytical model are usually calculated at the global structure level, which is time-consuming or even prohibitive for large-scale structures. Several substructuring approaches have been proposed that divide the global structure into some manageable substructures and assemble parts of the eigensolutions and eigensensitivities of the ...

Numerical algorithms for solving fluid flow problems are traditionally constructed in either an Eulerian or a Lagrangian reference frame. In the Lagrangian formulation, the mesh follows the fluid motion and this automatically guarantees the accurate treatment of interfaces. However, when large relative motions occur in the flow, the mesh becomes tangled ...

Timing-accurate storage emulation offers a unique capability: flexibility of simulation with the reality of experimental measurements. This allows a researcher to experiment with not-yet-existing storage components in the context of real systems executing...

Many future mission models require large space (LSS) which have accurate surfaces and/or the capability of being accurately aligned. If ground test approaches which will provide adequate confidence of the structrual performance to the program managers are...

The development of accurate and reliable plate bending elements based on the shear flexible Mindlin plate theory has resulted in attempts to accurately evaluate bending moments and shear forces in transversely loaded plates. It appears from such studies t...

In this paper, a finite difference code for Direct and Large Eddy Simulation (DNS/LES) of incompressible flows is presented. This code is an intermediate tool between fully spectral Navier-Stokes solvers (limited to academic geometry through Fourier or Chebyshev representation) and more versatile codes based on standard numerical schemes (typically only second-order ...

Truncated Gaussian fields provide a flexible model for defining binary media with dispersed (as opposed to layered) inclusions. General properties of excursion sets on these truncated fields are coupled with a distance-based upscaling algorithm and approximations of point process theory to develop an estimation approach for effective conductivity in two-dimensions. Estimation ...

Dynamically evolving boundaries and deforming bodies interacting with a flow are commonly encountered in fluid dynamics. However, the numerical simulation of flows with dynamic boundaries is difficult with current methods. We propose a new method for studying such problems. The key idea is to use the overset grid method with a thin, body-fitted grid near the deforming ...

In relation to the design of an innovative FLexible-fuel-cycle Water Reactor (FLWR), investigation of thermal-hydraulic performance in tight-lattice rod bundles of the FLWR is being carried out at Japan Atomic Energy Agency (JAEA). The FLWR core adopts a tight triangular lattice arrangement with about 1 mm gap clearance between adjacent fuel rods. In view of importance of ...

The Fractional Langevin Equation (FLE) describes a non-Markovian Generalized Brownian Motion with long time persistence (superdiffusion), or anti-persistence (subdiffusion) of both velocity-velocity correlations, and position increments. It presents a case of the Generalized Langevin Equation (GLE) with a singular power law memory kernel. We propose and numerically realize a ...

Digital holography appears to be a strong contender as the next-generation technology for holographic diagnostics of particle fields and holographic particle image velocimetry for flow field measurement. With the digital holographic approach, holograms are directly recorded by a digital camera and reconstructed numerically. This not only eliminates wet chemical processing and ...

This work was motivated by four goals: (1) by working in configuration space, where intuition is greatest, investigate graphically those trinucleon properties which are determined by specific features of wave functions; (2) produce benchmark calculations against which new techniques and numerical methods can be measured; (3) investigate the effect of the Coulomb interaction ...

This numerical work is an attempt to build accurate and continuous response surfaces of two degree-of-freedom vortex-induced vibrations (VIV) of flexibly mounted cylinders for a wide range of transverse and in-line natural frequencies. We consider both the structure and the flow to be two-dimensional. The structure has a low mass ...

Mathematical modeling has become an integral component in biotechnology, in which these models are frequently used to design and optimize bioprocesses. Canonical models, like power-laws within the Biochemical Systems Theory, offer numerous mathematical and numerical advantages, including built-in flexibility to simulate general ...

This paper presents a numerical study of the 3D flow around a cylinder which was defined as a benchmark problem for the steady state Navier-Stokes equations within the DFG high-priority research program flow simulation with high-performance computers by Schafer and Turek (Vol. 52, Vieweg: Braunschweig, 1996). The first part of the study is a comparison of several finite ...

For differential-difference equations, we provide a method that gives numerical solutions accurate to hundreds or even thousands of digits. We illustrate with numerical solutions to three classical problems. With a few exceptions, previous claims of extended accuracy for these problems are found to be wrong.

The concept of 'numerical speed of sound' is proposed in the construction of numerical flux. It is shown that this variable is responsible for the accurate resolution of' discontinuities, such as contacts and shocks. Moreover, this concept can he readily ...

A numerical algorithm suitable for rapid numerical solution of advanced turbulence-model equations on elliptic regions has been devised. The algorithm is particularly useful for obtaining accurate solutions when (a) one of the dependent variables is singu...

This paper demonstrates that filtered inverse system can be used effectively for the feed forward control of a flexible stacker crane. A numeric model for the crane is developed from the experimental input and output data. From this model, a feedfoward controller based on an inverse system was developed and simulated. We applied the feedforward control to ...

The relaxation data, shown on the left, does not suggest the linker is flexible. Instead, there are numerous places within the N-terminal and the C-terminal domains show flexibility.

The Deficiency Corrective Action Program (DCAP) code was used to simulate analog and digital control of a flexible spacecraft for the case of only in-plane motion, without spinning. For analog control, a simple PD scheme with sensors and actuators on the ...

Water impact accelerations of flexible spherical shells are analyzed considering hydroelastic interactions between water and vibrations of bottom surfaces. Four equations are derived to express the phenomena and solved numerically. Experiments were carrie...

The report focuses on the mathematical modelling of the dynamics of spacecraft based manipulators displaying structural flexibility in their links. The equations of motion must be cast in a form suitable for efficient numerical simulation. In the report t...

The finite difference�marker-in-cell (FD-MIC) method is a popular method in thermomechanical modeling in geodynamics. Although no systematic study has investigated the numerical properties of the method, numerous applications have shown its robustness and flexibility for the study of large viscous deformations. The model setups used ...

Base isolation can effectively reduce the seismic forces on a superstructure, particularly in low- to medium-rise buildings. However, under strong near-fault ground motions, pounding may occur at the isolation level between the base-isolated building (BIB) and its surrounding retaining walls. To effectively investigate the behavior of the BIB pounding with adjacent structures, after assessing some ...

A single step second-order accurate flux-difference-splitting method has been developed for solving unsteady quasi-one-dimensional and two-dimensional flows of multispecies fluids with finite rate chemistry. A systematic method for incorporating the source term effects into the wave strength parameters of Roe's linearized approximate Riemann solver is presented that is ...

A study for validating a time-accurate explicit finite element code for modeling fully-coupled flexible multibody systems carrying liquid-filled tanks is presented. The multibody system includes rigid bodies, flexible bodies, joints, and actuators. Rigid ...

... Flexible, Numerically Robust Array Processing Algorithm and its Relationship to the ... Ling, D Manolakis and J G Proakis, "A Recursive Modified Gram ...

... fabrication process uses T-base lathes, similar to the one shown in figure 1, which are equiped with a Computer Numerical Control (CNC) system. ...

... At lower rates (or lacger values of "a") the effect of sampling is to ... first-order effect of sampling is to introduce the rhp numerator zero at ...

... and Kenneth Harris without whose love and support ... have had numerous conversations about my projects which ... or a person with long flexible hair. ...

Soil microorganisms are essential to life, and to all agricultural practices. They are numerous, diverse, and metabolically flexible. Basic information regarding the soil microorganisms and their roles with respect to crop production are summarized for the layman....

o Observing System Simulation Experiments (OSSEs). � Use current-generation physics and numerics. � Design for flexibility across computer systems ...

... in any body is obtained by solving the ... Another numerical method is the use of spline ... I C. NEW APPROACH TO STRESS-STRAIN MODELING OF ...

An approximate theoretical and numerical model for gradient drift microstructure has been developed. While it is believed to be completely consistent with all current theoretical understanding of the physics, the model is quite flexible and adjustable so ...

A flexible aerogel and process of fabrication. An aerogel solution is mixed with fibers in a mold and allowed to gel. The gel is then processed by supercritical extraction, or by air drying, to produce a flexible aerogel formed to the shape of the mold. The flexible aerogel has excellent thermal and acoustic properties, and can be ...

A flexible aerogel and process of fabrication. An aerogel solution is mixed with fibers in a mold and allowed to gel. The gel is then processed by supercritical extraction, or by air drying, to produce a flexible aerogel formed to the shape of the mold. The flexible aerogel has excellent thermal and acoustic properties, and can be ...

The purpose of the present paper is to perform direct numerical simulations of the time-developing subsonic and supersonic mixing layers. In order to simulate unsteady shock-vortex interactions accurately, a fourth-order accurate shock capturing scheme is...

Numerical control of metalworking machines and flexible manufacturing systems could help raise metalworking productivity. These systems permit automation of small-lot production and more variety in design than mass production allows. Their information req...

Plasmator is a flexible monodimensional numerical code for plasma transport in Tokamaks of circular cross-section, it allows neutral particle transport and impurity effects. The code leaves a total freedom in the analytical form of transport coefficients....

The in-orbit instability of the Ulysses spacecraft was numerically simulated. The thermal excitation from the solar flux, the flexible axial boom, and the deployment mechanism were modeled and analyzed. In order to model a non-isolated mechanical system, ...

Theoretical and numerical analysis of the multipass amplifier illustrates its flexibility in applications ranging from efficient high-power pulse amplification to short-pulse generation with great amplitude and pulse-width stability.

The Generalized Multipole Technique, due to its flexibility, is used in a variety of cases for the analysis of electromagnetic structures. This method is generally based on a multiple multipole expansion and a point matching technique. The numerical condi...

We propose two efficient numerical methods of evaluating the luminosity distance in the spatially flat Lambda cold dark matter (?CDM) universe. The first method is based on the Carlson symmetric form of elliptic integrals, which is highly accurate and can replace numerical quadratures. The second method, using a modified version of ...

Many geotechnical engineering problems involve the localization of deformations along distinct shear planes, such as the response of a layer of soil to displacement along an underlying bedrock fault. Understanding the process of deformation localization and the propagation of shear zones to the surface would aid in the siting of structures near faults, and in developing mitigation techniques. ...

3D numerical simulation is a challenging issue for assessing the seismic response in complex media like sedimentary basins. In such models, the 3D geometry and the local geological features can result in significant wave amplifications and trapping of specific frequencies. These 3D effects must be taken into account for strong motion prediction and seismic risk assessment and ...

Flexible polyurethane foam is used in a variety of engineering applications, including automotive seating. It exhibits nonlinear and viscoelastic response to mechanical loading. Accurate models are needed for effective and efficient design of seating systems utilizing this material. The overall objective of the present investigation was to measure and ...

The overall goal of the present project is to enable advanced modeling and simulations for the design and optimization of fuel-flexible turbine combustors. For this purpose we use a high-fidelity, extensively-tested large-eddy simulation (LES) code and state-of-the-art models for premixed/partially-premixed turbulent combustion developed in the PI's group. In the ...

This paper considers a systematic approach for motion planning and feedforward control design for a flexible cantilever actuated by piezoelectric macro-fiber composite (MFC) patches. For accurate feedforward tracking control, special attention has to be paid to the inherent nonlinear hysteresis and creep behavior of these actuators. In order to account for ...

Since the introduction to seismology of the so-called Spectral Element Method (the SEM: a powerful numerical tool which allows accurate simulations of wave propagation in complex elastic media), numerous seismologists have assessed various global tomographic models to test how well the SEM synthetics fit observed waveforms and ...

This paper presents a novel numerical technique for large-scale groundwater flow simulations, in the frame of artificial recharge planning. The implementation is demonstrated using two test-sites from the EU funded GABARDINE project (FP6): The Sindos test site, near Thessaloniki, Greece, examines the infiltration of water towards the water table, through several unsaturated ...