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Meta-motion unit part tolerance distribution method based on state space equation

A technology of state space equations and allocation methods, which is applied in complex mathematical operations and other directions, and can solve problems such as the lack of establishment of part tolerance allocation methods

Active Publication Date: 2019-07-12
CHONGQING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, the theory of meta-action units has only been applied in the field of reliability, and the method of part tolerance allocation for meta-action units has not yet been established.

Method used

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  • Meta-motion unit part tolerance distribution method based on state space equation
  • Meta-motion unit part tolerance distribution method based on state space equation
  • Meta-motion unit part tolerance distribution method based on state space equation

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with embodiment.

[0044] During specific implementation: if figure 1 and figure 2 as shown,

[0045] 1. According to the composition structure of the meta-action unit, such as figure 2 As shown, the power input part, intermediate part, fastener, support part and power output part of the meta-action unit are obtained. The output accuracy of the meta-action unit can be regarded as the geometric dimensions of each part are finally superimposed on the power output part through assembly, which is reflected in the pose of the power output part in the direction of six degrees of freedom in space, where x, y, and z represent space right angles The movement along the coordinate axis in the coordinate system, α, β, γ represent the rotation around the coordinate axis.

[0046] 2. Establish the assembly sequence of each part of the meta-action unit, and extract the key matching features M=(M 1 , ...

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Abstract

The invention discloses a meta-motion unit part tolerance distribution method based on a state space equation. The method includes: Analyzing the structure model of the element action unit, and explaining the assembly tolerance transfer of the element action unit as the superposition process of the dimensional tolerance and the form and location tolerance of each part under different matching forms; determining a part assembly sequence of a meta-motion unit and related part geometrical characteristics of each matching characteristic, expressing a geometrical characteristic space pose of each part by using a small displacement spinor according to a tolerance model, and calculating and obtaining micro transformation of an actual pose of the assembly characteristic after each step of assembly; obtaining an output tolerance vector of the assembled power output part according to the assembly tolerance differential vector so as to obtain a state space equation of the element action unit in the assembly process; through iterative calculation, fitting out the part geometric tolerance meeting the requirement, and achieving distribution of the element action unit part tolerance.

Description

technical field [0001] The invention belongs to the technical field of mechanical tolerance allocation, in particular to the technical field of precision design, and in particular relates to a tolerance allocation method of meta-action units based on state space equations. Background technique [0002] The problem of tolerance distribution is the primary task to be solved in the product design stage, and an effective and accurate tolerance distribution model is the basis for a reasonable distribution of machining accuracy of parts. Mechanical products are usually assembled from hundreds or thousands of parts. For the distribution of product tolerances, if the transfer model between parts is directly studied, the calculation process will be cumbersome and the calculation results will have large errors due to the large number of parts. The traditional tolerance allocation model mainly considers the subordination relationship between parts and products, and cannot reflect the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10
CPCG06F17/10Y02P90/30
Inventor 王宏伟冉琰张根保王志超张生永
Owner CHONGQING UNIV
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