A Statistical Tolerance Analysis Method for Flexible Assembly

An analysis method and flexible assembly technology, applied in computing, special data processing applications, instruments, etc., which can solve problems such as material elastic modulus and Poisson's ratio random error without consideration

Inactive Publication Date: 2017-10-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] In order to solve the problem that the elastic modulus and Poisson's ratio random error of materials are not considered in the existing flexible assembly statistical tolerance analysis, the present invention provides a flexible assembly statistical tolerance analysis method, which makes the deviation prediction of flexible assembly more accurate and more in line with engineering actual

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  • A Statistical Tolerance Analysis Method for Flexible Assembly
  • A Statistical Tolerance Analysis Method for Flexible Assembly
  • A Statistical Tolerance Analysis Method for Flexible Assembly

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with accompanying drawing.

[0051] The flexible assembly statistical tolerance analysis method of the present invention considering the random error of material properties, the flow chart is as follows figure 1 As shown, the specific implementation is implemented in the following steps:

[0052] Step 1: If figure 2 In the assembly and positioning stage of the flexible thin plate parts shown, the three-coordinate measuring machine is used to collect data on the thin plate parts to obtain the geometric dimensions and deviation δ of parts A and B A ,δ B , using the statistical tolerance analysis method (STA) to obtain the mean value {μ δ} A 、{μ δ} B and variance

[0053] Step 2: Combining with the surface continuity model of the flexible part, calculate the covariance (COV) to obtain the closed gap covariance matrix [∑ δ ] A , [∑ δ ] B ;

[0054] [∑ δ ] A =[S] A [∑ S ] A [S] T A (1...

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Abstract

The present invention establishes a flexible assembly statistical tolerance analysis method considering the elastic modulus of material and Poisson's ratio random error, using statistical tolerance analysis method (STA), covariance (COV) calculation, finite element analysis method (FEM), super Using element stiffness matrix theory and other methods, the calculation model of assembly stiffness matrix considering the random error of material elastic modulus and Poisson's ratio is established, and the calculation model of assembly springback deviation mean and covariance matrix is ​​obtained, which is helpful for scientifically and accurately determining material properties The impact of errors on flexible assembly deviations improves the scientificity of engineering applications.

Description

technical field [0001] The invention relates to the field of dimensional deviation analysis of flexible parts assembly, in particular to a statistical tolerance analysis method for flexible assembly. Background technique [0002] During the assembly process, the flexible parts are subjected to various complex assembly forces, and the parts deform under the force and spring back after the force is released. The formation mechanism of the assembly dimensional tolerance is different from that of the rigid parts assembly. Due to the existence of tolerances, rigid parts will produce assembly gaps or interferences during the assembly process, while flexible parts can overcome the gaps and interferences due to tolerances through force deformation, but at the same time the introduction of assembly stress will lead to assembly deformation. Therefore, it is necessary to use effective methods to analyze the deformation and deviation during the assembly process of flexible parts and pre...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 谭昌柏陈晖王志国
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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