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Numerically simulating structural behaviors of a product by using explicit finite element analysis with a mass scaling enhanced subcycling technique

A structural performance, finite element technique used in the field of numerical simulation of product structural performance using explicit finite element analysis and mass scaling enhanced sub-cycle technology, which can solve problems such as changing structural dynamic performance

Active Publication Date: 2013-07-17
LIVERMORE SOFTWARE TECH
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Problems solved by technology

However, artificially applying mass scaling to the FEA model may alter the dynamic behavior of the structure in unwanted ways (i.e., artificially higher mass)

Method used

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  • Numerically simulating structural behaviors of a product by using explicit finite element analysis with a mass scaling enhanced subcycling technique
  • Numerically simulating structural behaviors of a product by using explicit finite element analysis with a mass scaling enhanced subcycling technique
  • Numerically simulating structural behaviors of a product by using explicit finite element analysis with a mass scaling enhanced subcycling technique

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Embodiment Construction

[0021] figure 1 is a flowchart illustrating an exemplary process 100 for numerically simulating structural performance of a product using explicit finite element analysis (FEA) with mass scaling enhanced sub-cycle techniques, according to an embodiment of the present invention. Preferably, process 100 is understood in conjunction with the preceding figures and is implemented in software.

[0022] Process 100 begins by receiving a finite element analysis (FEA) model representing a product or structure (eg, automobile, aircraft, etc.) at step 102 . The FEA model includes multiple nodes and multiple finite elements associated with material properties. Next at step 104, an element critical time step is determined for each finite element (e.g. Figure 2A ). Accordingly, each node is assigned an individual node critical time step (e.g., Figure 2B ). Selects the smallest element critical time step at a particular node for all finite elements it is connected to.

[0023] In ste...

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Abstract

Methods and systems for numerically simulating structural behaviors of a product by using explicit FEA with a mass scaling enhanced subcycling technique are disclosed. A FEA model of the product defined by a plurality of nodes and finite elements is received. A critical time step size is calculated for each finite element and then assigned to associated nodes. Elements are partitioned into N element groups with first group requiring minimum time step size [Delta]t1 and other element groups requiring respective time step sizes ([Delta]tN=2N-1[Delta]t1). In order not to resort or repartition the finite elements and still obtain a stable solution, respective proper amounts of mass scaling are applied to those elements that have become too small to maintain a stable solution in their respective element groups. A time-marching simulation using explicit FEA with the mass scaling enhanced subcycling technique is then conducted with such a FEA model.

Description

technical field [0001] The present invention relates generally to computer-aided engineering analysis, and more particularly to the use of explicit finite element analysis (FEA) numerical simulations of products (e.g., automotive , aircraft, etc.) method and system for structural performance. Background technique [0002] Finite element analysis (FEA) is a computerized method widely used in industry to model and solve engineering problems related to complex systems, such as three-dimensional nonlinear structural design and analysis. The name FEA originates from the way the geometry of the object under consideration is specified. With the advent of modern digital computers, FEA has been implemented as FEA software. Basically, FEA software provides a model with a geometric description and associated material properties at each point within the model. Within this model, the geometry of the system under analysis is represented by various sized solids, shells, and beams called...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2217/16G06F17/50G06F17/5095G06F17/5018G06F30/15G06F30/23G06F2111/10
Inventor 约翰·奥·哈尔奎斯特
Owner LIVERMORE SOFTWARE TECH
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