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

A finite element and mass technology, which is applied in the field of computer-aided engineering analysis and can solve problems such as changing the dynamic performance of structures

Active Publication Date: 2013-07-17
LIVERMORE SOFTWARE TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, artificially applying mass scaling to the entire 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 combined technique of mass scaling and subcycling
  • Numerically simulating structural behaviors of a product by using explicit finite element analysis with a combined technique of mass scaling and subcycling
  • Numerically simulating structural behaviors of a product by using explicit finite element analysis with a combined technique of mass scaling and subcycling

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Embodiment Construction

[0024] figure 1 is a flowchart illustrating an exemplary process 100 for numerically simulating the structural performance of a product using explicit finite element analysis (FEA), employing a combined technique of subcycles and mass scaling, in accordance with an embodiment of the present invention. Preferably, process 100 is understood in conjunction with other diagrams and is implemented in software.

[0025] 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 a number of nodes and a number of finite elements defining the product, with associated material properties. Types of finite elements may include but are not limited to solids, shells, harnesses, truss, etc. ( Figure 4 An exemplary shell element 401 and an exemplary solid element 402 are shown). In addition, the minimum time step (Δt min ) (for example, by users (i.e. engineers, scientists ...

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Abstract

Methods and systems for numerically simulating structural behaviors of a product by using explicit FEA with a combined technique of subcycling and mass scaling are disclosed. A FEA model representing a product and a minimum time step size ([Delta]tmin) for a time-marching simulation of the product are specified. N element groups is established with the first element group associated with [Delta]tmin as required minimum time step size, while other element groups with integer multiples of [Delta]tmin according to formula [Delta]ti=2i-1[Delta]tmin, n=1, 2, . . . , N. Finite elements are periodically resorted into N element groups based on their new respective [Delta]tcr. To ensure all finite elements in the FEA model are processed at the user specified minimum time step size, proper amount of mass scaling is applied to those finite elements that are or have become too small to maintain a stable solution in the first element group.

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., automobiles, Methods and systems for structural performance of aircraft, etc. 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 cal...

Claims

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Application Information

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