As one of the mainstream software packages widely used in automotive industry, LS-DYNA provides not only strong nonlinear capabilities for crashworthiness simulation, but also a suite of solvers for NVH and fatigue (durability) analysis. For NVH analysis, a series of vibration and acoustic solvers have been implemented to meet the need from CAE analysis of automotive of different levels and phases. They include FRF (Frequency Response Function), SSD (Steady State Dynamics), random vibration, response spectrum analysis, and acoustic analysis based on BEM (Boundary Element Method), FEM (Finite Element Method) and SEM (Spectral Element Method). The fatigue analysis features include fatigue damage solvers in both time domain and frequency domain (based on random vibration and steady state vibration).
There is rapid convergence of multiple technologies that are creating unprecedented capabilities in every field of technology. The incorporation of new technologies like Artificial Intelligence/Machine Learning (AI/ML) in the CAE process has been quite gradual. Xitadel’s XIPA technology is a pioneering effort to leverage the power of ML to transform the CAE model build process and bring this to production level. CAE modeling is a critical path in the overall CAE process. CAE modeling however is very time consuming, particularly because plastic subsystems typically contain multiple complex features and variable thicknesses.
Increasingly there is an emphasis in the engineering simulation community on ultrasonic devices. They are seen in medical imaging, structural health monitoring, and of course, in the rapidly emerging world of autonomous/semi-autonomous vehicles. These devices operate at frequencies of 50KHz and above, sometimes well above. Wavelengths at those frequencies are measured in millimeters, sometimes even micrometers. The simulation of the propagation of such short waves over any substantial distance is a very demanding endeavor. This is especially true if tri-linear/quadratic iso-parametric finite elements are used. Newer, higher-order finite element methods exist [1]. Among those methods is the spectral element method (SEM). Many SEM references are available in the literature, a sampling being [1-6.] Spectral elements are appealing because they are highly accurate and can be efficiently incorporated in an explicit solver like LS-DYNA. In a massively parallel setting, they allow for the solution of models with billions of degrees-of-freedom in a reasonable amount of time.
At IBM systems robust and reliable designs of servers and supercomputers are one of the main objectives. Predicting mechanical performance of servers, such as IBM Cognitive Systems' Power9 portfolio can be more challenging considering shorter development cycles, increasingly dense product design as well as advanced design features. The 2U version includes DDR4 RDIMM’s, Power9 hybrid land grid array (HLGA) processor modules, PCIe Gen3 and Gen4 slots, blowers, hard drives, and internal storage controller slots.
The increased use of castings, forgings and thick extrusions in vehicle structures has led to the need for modeling certain parts with solid elements in crash simulations. Since the geometries of the considered parts are typically highly complex, using tetrahedral elements seems to be the practical solution. In the LS-DYNA simulation software, a multitude of different tetra element formulations are available however there is some uncertainty whether these elements can be used with confidence in a simulation for accurate fracture prediction based on a stress state dependent failure model.
This study aims to present a proposal for finite element modeling for electrical cables of a PDC to improve the response of the virtual analysis during design phase, establishing a good interation of electrical cables during crash tests. The objective of this study is to present types of elements and contact pairs that are capable of predicting the response of electrical cables.
Recent developments in NVH and fatigue solvers in Ansys LS-DYNA®