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Computer auxiliary statistical tolerance design method based on mixing convolution algorithm

A computer-aided design method technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as complex calculations

Inactive Publication Date: 2009-07-29
TIANJIN UNIV OF SCI & TECH
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Problems solved by technology

In theory, the convolution method can solve the random variables of any distributed ring size and various confidence levels, but the calculation is more complicated, and it needs to be calculated with the help of numerical integration and programming techniques

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  • Computer auxiliary statistical tolerance design method based on mixing convolution algorithm
  • Computer auxiliary statistical tolerance design method based on mixing convolution algorithm
  • Computer auxiliary statistical tolerance design method based on mixing convolution algorithm

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Embodiment Construction

[0046] The present invention is further described below in conjunction with embodiment; Following embodiment is illustrative, not limiting, can not limit protection scope of the present invention with following embodiment.

[0047] A computer-aided statistical tolerance design method based on a hybrid convolution algorithm, the hybrid convolution design method of the statistical tolerance design is:

[0048] Assuming a size chain has n rings, if the random variable X i (i=1, 2, ..., n) represents the processing size of the i-th component ring, then the size Z of the closed ring of the size chain is a random variable X i (i=1, 2,..., n) function, denoted as

[0049] Z=h(X 1 , X 2 ,...,X n ) (1)

[0050] Formula (1) is called the design function. (Note: In the forward calculation, Z represents the size of the closed ring, and in the reverse calculation, Z represents the size of the unknown constituent ring; X i (i=1, 2, . . . , n) represents the ...

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Abstract

The invention relates to a design method of computer assistant tolerance statistics based on mixed convolution algorithm. A dimension chain is provided with n composition rings, the function relation between the dimension Z of a closed ring and the dimension Xi of the composition ring is set as a design function which is analyzed into a linear part and a nonlinear part, the nonlinear part is linearized and a high-level remainder is omitted to transform the design function into a linear function, i.e., a mixed convolution method comprising a resolution convolution and a numerical convolution can be used for determining the distribution of the dimension Z of the closed ring, and the calculation results can be corrected by the adoption of a closed ring correction method or a composition ring correction method. The design method promotes the existing tolerance statistics method to the calculation of the dimension chain of the composition ring and the closed ring with different distributions, is applicable to the mixed convolution algorithm that is effective for various linear and nonlinear problems, and has relatively rapid calculation speed and relatively high calculation precision.

Description

technical field [0001] The invention belongs to the technical field of computer-aided design engineering, and in particular relates to a computer-aided statistical tolerance design method based on a hybrid convolution algorithm. Background technique [0002] In the past thirty years, the research on Computer Aided Statistic Tolerancing (CAST) has developed rapidly, and these researches are all carried out according to the development and needs of computer aided engineering. The research work of computer-aided tolerance design technology at home and abroad can be roughly divided into four categories: the first category mainly studies the representation of computer-aided tolerance information and the generation of design functions; the second category focuses on computer-aided process tolerance design; the third category studies Focus on reasonable machining cost-tolerance model; the fourth category is the research on parallel optimization design of design tolerance and proces...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李振刚王平张大克刘少岗沈晓阳
Owner TIANJIN UNIV OF SCI & TECH
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