Efficient algorithm for node load conversion among different engineering physical model grids

A technology of node load and engineering physics, applied in the direction of electrical digital data processing, instrumentation, geometric CAD, etc., to achieve the effect of improving algorithm accuracy, enhancing internal constraint characteristics, and improving adjustability

Active Publication Date: 2020-01-17
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This method is only based on the physical calculation characteristics of the load, and does not need to be coupled with the energy transfer

Method used

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  • Efficient algorithm for node load conversion among different engineering physical model grids
  • Efficient algorithm for node load conversion among different engineering physical model grids
  • Efficient algorithm for node load conversion among different engineering physical model grids

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Effect test

Embodiment 1

[0128] In this embodiment, there are two forms of node load distribution on regular plane grids, namely, uniform distribution and sinusoidal distribution. The nodes of the fine grid of model a are converted to the centroid points of the coarse grid of model s, and three constraints are adopted The load-independent transformation algorithm implementation of the equations was performed in order to test the basic capabilities of the algorithm of the present invention. The specific process includes the following steps:

[0129] Step S11, set up two kinds of grid node coordinates on a 100 * 100 plane with Matlab software: one is the node coordinates (x aj ,y aj )j=1,...,34; the other is the 15×11 rectangular grid s node coordinates (x sk ,y sl ), k=1,...,15; l=1,...,11. Do two kinds of function values ​​on grid a: one is a function whose uniform value is equal to 10; the other is to calculate the node function value according to the sinusoidal column function 10×sin(π·x / 100). ...

Embodiment 2

[0134] The present embodiment is the right half wing configuration of an unmanned aerial vehicle, and the plane view of wing is as Figure 4 shown. The analysis task is to convert the nodal load data calculated by the computational fluid dynamics CFD on the wing object surface to the grid centroid point of the coarse grid used for structural analysis. The radial basis interpolation function RBF point-by-point quasi-interpolation distribution algorithm in the literature is adopted, and the 3-constraint equation independent load conversion algorithm and the 6-constraint equation independent load conversion algorithm of the present invention are used to implement the load distribution calculation of this example respectively, and adopt the present invention The LAC index given in step 7 evaluates the distribution characteristics of its distributed load.

[0135] Step S21, using Matlab software to design a software program according to the radial basis interpolation function RBF po...

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Abstract

An efficient algorithm for node load conversion among different engineering physical model grids utilizes different monotonous subtraction value characteristics of different negative power exponent point spacing monomials, introduces more constraint equations, improves distribution characteristics of node load conversion between different grids, establishes a distribution coefficient in combination with scatter full scanning, has no requirement for regularity of node grids, and is easy to achieve parallel computing, and the finally obtained linear equation set does not exceed six orders, thuscompleting solving the inversion calculation efficiency problem of a large equation set. Numerical examples show that the algorithm of the invention is obviously improved and enhanced in precision andefficiency compared with the existing algorithm technology. The algorithm technology provided by the invention has important application value and significance for improving node load conversion calculation among different grid models in engineering coupling problem numerical analysis.

Description

technical field [0001] The invention belongs to the technical field of numerical analysis of modern engineering physics, and relates to a high-efficiency algorithm for converting scattered loads of grid nodes of different models. Background technique [0002] In the analysis of modern engineering physics problems, numerical calculation has become the third type of technical means in addition to theoretical research and experimental testing. It has many advantages such as high efficiency, quickness and low cost for engineering project decision-making and technical performance prediction. Usually, the design and analysis of engineering physics devices involves multidisciplinary issues, and multiple types of physical quantities between different disciplines are coupled and influenced by each other. Due to the professional differences of different disciplines and the differences in the magnitude of physical quantities, numerical calculation technology needs to use the physical in...

Claims

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Application Information

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IPC IPC(8): G06F30/15G06F119/14
Inventor 艾俊强孙秦刘彦杰谢怀强
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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