Series structure quality distribution evaluation method

An evaluation method and a series mechanism technology, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., can solve the problems of no quality distribution, high difficulty, poor effect, etc., and achieve the effect of simplified model and high accuracy

Pending Publication Date: 2020-08-04
TIANJIN UNIV
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Problems solved by technology

[0002] For series structures such as high-end CNC machine tools and manipulators, mass distribution plays an important role in their dynamic characteristics, and dynamic characteristics have an important relationship with their motion accuracy. In the traditional evaluation process for such structures, there is no effective evaluation directly for mass distribution. Methods, usually with the help of commercial finite element software or complex dynamic models, simulate or calculate the dynamic characteristics of the system, and then evaluate them
[0003] At present, in the initial design stage of high-end CNC machine tools and tandem manipulators, there is no effective quality distribution evaluation method. Instead, after the design of quality, structural parameters, and material types is completed, the performance of the whole machine must be evaluated based on various means, and then Evaluate the rationality of the quality distribution of the system structure, which is difficult and ineffective

Method used

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  • Series structure quality distribution evaluation method
  • Series structure quality distribution evaluation method

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Experimental program
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Effect test

Embodiment 1

[0029] Step 1: Select the evaluation object, such as figure 2 As shown, it is a typical series structure;

[0030] Step 2: Determine the quality of structural parts, such as figure 2 As shown, the masses of the three structural members in the series structure are m 1 、m 2 、m 3 ;

[0031] Step 3: Calculate the mass ratio of adjacent structural members, where:

[0032]

[0033] Step 4: Calculate the mass ratio of the whole machine system.

[0034] R T = r 1 + r 2

[0035] R T The larger the value, the more reasonable the mass distribution of the tandem structure is.

[0036] The validity of the method is verified by taking the three-degree-of-freedom system as the research object. The structure is as follows: figure 1 shown. The system consists of three masses M 1 , M 2 , M 3 , with a mass of m 1 、m 2 、m 3 . by Spring K 1 、K 2 、K 3 , the stiffness is k 1 、k 2 、k 3 . in K 1 There is a fixed constraint at M 3 for the free end. The system dynamics...

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Abstract

The invention discloses a series mechanism mass distribution evaluation method, which comprises the following steps of 1, selecting a series mechanism object, taking a connection kinematic pair as a joint point along the series chain direction of a series mechanism, reserving each structural member, and determining the mass of each structural member; 2, calculating the mass ratio of every two adjacent structural parts in the series connection structure; and 3, calculating the total mass ratio of the whole machine, and defining the sum of the mass ratios of all adjacent structural parts in theseries mechanism. By adopting the method, rationality evaluation of complete machine quality distribution is realized, and the method is rapid and efficient.

Description

technical field [0001] The invention relates to a mass distribution evaluation method of a series mechanism, in particular to a mass distribution evaluation method of a series structure based on the mass ratio of structural parts. Background technique [0002] For series structures such as high-end CNC machine tools and manipulators, mass distribution plays an important role in their dynamic characteristics, and dynamic characteristics have an important relationship with their motion accuracy. In the traditional evaluation process for such structures, there is no effective evaluation directly for mass distribution. Methods, usually with the help of commercial finite element software or complex dynamic models, simulate or calculate the dynamic characteristic index of the system, and then evaluate it. [0003] At present, in the initial design stage of high-end CNC machine tools and tandem manipulators, there is no effective quality distribution evaluation method. Instead, aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/17
CPCG06F30/17G06F30/20
Inventor 王晨升牛文铁刘宏达郭永豪陈志强
Owner TIANJIN UNIV
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