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NASA Langley Research Center (LaRC) has developed a comprehensive test and analysis program to evaluate the ability of LS-DYNA to model the materials and the phenomena involved in soil and water landing impacts of the Orion crew module. 12Elemental, scale boilerplate, and full-scale prototype testing is being conducted in support of the simulation verification and validation approach. Aspects of the...
With the rapid growth of the computer applications, multitudinous procedures were developed for the prediction of the strength and fractures of various materials in engineering applications. A finite element simulation of composite woven reinforcement forming requires the knowledge of the fabric mechanical behavior. In the presented microscopic approach, the plain weaved glass fabric/epoxy laminates...
Finite element model updating with incomplete complex modal data and structural parameters coupled with mass, stiffness and damping matrixes simultaneously for unsymmetrical damping system using optimization method is presented. By the use of finite element software-NASTRAN and mathematical tool-MATLAB model updating based on complex eigenvalue sensitivity analysis is successfully accomplished in...
Taking a special vehicle frame as the study object, in allusion to the complex time-consuming FEA computation in the optimization design, the numerical approximation technology of Kriging method is adopted to establish the approximate mapping relationship between design variables of vehicle frame and structural strength, stiffness and weight. The genetic algorithm is employed to perform the optimization...
Accurate computation of gun barrel temperature history is necessary to predict the barrel-wear and cook-off. Most of the previous researchers, in their computational models, neglected the variation of thermal conductivity and specific heat of gun metal, with temperature. It is expected to introduce an error in the results. In this work, this error was estimated by incorporating the variation of thermal...
In this work we analyze the performance of a structural health monitoring technique for bridges. The proposed technique employs the use of compactly supported sub-band space/frequency and time/frequency analysis using local vibration characteristics. Moreover, an adaptive beamformer is used to mitigate the effect of the extremely low signal-to-noise ration of the extracted features. The sensor array...
The thermodynamics of exhaust gas recirculation (EGR) coolers plays a very important role for reducing oxides of nitrogen (NOX) emissions of diesel engines. Using the ANSYS software, some fluid thermodynamic models of EGR coolers were established by using the finite element method (FEM); and the temperature fields of gas fluids in the EGR coolers were simulated and verified by comparing the experimental...
Traditional mechanical design process faces three major challenges: (1) the need for rapid and repeated numerous time-consuming simulations, such as finite element analysis and computational fluid dynamics; (2) the need for dataset management; (3) the lack of an integrated and easy-to-use collaborative mechanical design environment. This paper presents a grid-enabled solution for mechanical engineering...
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