Showing papers in "Advances in Engineering Software in 1998"

TL;DR: A parallel, implicit, unstructured Euler/Navier-Stokes solver has been developed that is accurate, robust and user-friendly, and permits the routine analysis of large viscous problems on workstation-class processors.

TL;DR: In this paper, an integrated framework for concurrent development of a project and the associated construction process is presented, where the authors examine the current status quo in the construction industry and the need for change.

TL;DR: In this paper, a two-dimensional quasi-periodic lattice truss with pin-jointed nodes in the case of static deformation is presented, and a simple illustrative example is given.

TL;DR: Kohonen's self-organization model, which uses typical artificial neural networks, is applied to predict the cleavability of oligopeptides by proteases with multiple and extended specificity subsites, and should be a useful technique for finding effective inhibitors of HIV protease, one of the targets in designing potential drugs against AIDS.

TL;DR: The relation between the multiple reciprocity method and the complex-valued formulation for the Helmholtz equation is re-examined in this article, where it is shown that the kernels derived from the conventional MRC method are exactly the same as those obtained in the complexvalued formulation.

TL;DR: Revised genetic operators and a new recombination scheme are presented, designed to ensure the balance between effective exploration and selective pressure to exploit the better solutions which are the main power behind the GAs.

TL;DR: The conditional probability density function (pdf) is developed for each monopulse measurement of a Rayleigh target by conditioning the pdf of the complex monopulse ratio on the measured amplitude of the sum signal.

TL;DR: In this article, a methodology for the probabilistic analysis of concrete gravity dams is presented, Concrete properties and seismic excitation are considered as random variables, and structural response is obtained employing the finite element method to solve the equations of motion of the coupled system dam-reservoir-foundation.

TL;DR: In this article, a numerical approach is proposed and applied to a case study dealing with a typical transformer cell in an underground power plant, where the fluid-structure interaction code PLEXIS-3C is used to perform both fluid and structural fast dynamic computation.

TL;DR: In this article, the authors concentrate on parallel implementations of neural networks and genetic algorithms and show how a parallel finite element analysis may be undertaken in an efficient manner by preprocessing of the finite element model using a genetic algorithm utilizing a neural network predictor.

TL;DR: In this paper, a nonlinear explicit dynamic finite element code for use on scalable computers is presented, written entirely in FORTRAN 90, but uses MPI for all interprocessor communication.

TL;DR: In this article, a finite element model of steel girders with corrugated webs was developed using thin shell elements and tested under shear, uniform bending and local discrete compressive loads on the top flange.

TL;DR: Two ANSI C subroutines for the direct solution of finite time optimal control problems are described, one of which is parameterized using a piecewise linear approximation and the other using the sequential unconstrained minimization technique.

TL;DR: In this paper, a brief review of the basic points of the infinitesimal deformation theory of unsaturated porous media is presented, including the main modifications due to nonlinear and suction-dependent behaviour.

TL;DR: Two new reliability measures are proposed that, for small networks in particular, are easy to understand and interpret and straightforward to calculate and are fully capable of quantifying partial failure.

TL;DR: The object-oriented approach makes it much easier to exercise control over the calculation processes, both in terms of the algorithms used, and in taking advantage of the multi-threading.

TL;DR: In this paper, a three-dimensional variational, finite element analysis technique was used to study the thermal stresses in aluminum-to-composite, symmetric double-lap joints.

TL;DR: In this article, an algorithm is presented for the optimum design of three-dimensional rigidly jointed frames which takes into account the nonlinear response due to the effect of axial forces in members.

TL;DR: The research described examines issues involved in the integration of construction disciplines by using Case-Based Reasoning by describing a hierarchical case memory structure and a context-based indexing method for retrieval and reuse of previous designs and their costs.

TL;DR: In this article, the mathematical analysis of thermal crack formation during continuous solidification processes is characterized by a fully coupled analysis of solidification and further cooling, strand contraction and resulting thermal stresses.

TL;DR: In this paper, the authors investigated the mode-I stress distribution around the crack tip in a thin conducting plate under a uniform electric current flow and proposed an algorithm based on the Biot-Savart integral to reduce the calculation of magnetic field in the thin plate to a two-dimensional analysis problem.

TL;DR: The Langley Aerothermodynamic Upwind Relaxation Algorithm (LAURA), a Navier-Stokes solver, has been modified for use in a parallel, distributed-memory environment using the Message-Passing Interface (MPI) standard.

TL;DR: A low-level image processing front-end is currently being developed to support the interpretation of drawings in vector format from scanned paper P&IDs.

TL;DR: An effective pure finite element methodology for the process simulation analysis of mold filling in RTM is employed for large-scale process simulation of composite structures and the computational effectiveness of the methodology is demonstrated for large -scale process simulations.

TL;DR: An overview of the product and process entities and the organizational, interaction and sequence relationships of entity-based integrated design product-and process models is presented in this paper, along with formal concepts and notation used to represent these entities and relationships.

TL;DR: In this paper, the authors examined the role of the integrated force method in analysis, animation and design of aerospace and other products and concluded that it is advisable to use both methods to calculate stress and eliminate errors through comparison.

TL;DR: A nondestructive procedure was proposed in the paper to determine the welding residual stresses with the aid of the boundary integral equation and its discrete form—the boundary element method, in which the displacements measured at the boundaries or the welding deformations of the welded structures were taken as the known boundary conditions.

TL;DR: The measurements and discussion lead to the conclusion that Hyglac is suitable for running these types of codes (in a research/industrial environment such as at JPL) and that the primary factor for determining how a given code will perform is the code's ratio of communication to computation.

TL;DR: This work considers a finite-element formulation of the problem with adaptive refinement of an unstructured mesh to accurately model plastic transition zones and presents a framework for the parallel implementation of such complex algorithms.

TL;DR: Comparisons with some recent programs based on analytical and heuristic techniques demonstrate the high computational efficiency of the presented technique making it suitable for solving large-scale layout problems on a PC.