Assembly precision prediction method for planar closed-loop precision bar system

A technology of assembly accuracy and prediction method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as long assembly cycle

Active Publication Date: 2018-05-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for predicting the assembly accuracy of a plane closed-loop precision rod system, which solves the problem that the assembly cycle is too long due to "blind assembly" and "blind adjustment" in the current assembly process of a plane closed-loop precision rod system

Method used

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  • Assembly precision prediction method for planar closed-loop precision bar system
  • Assembly precision prediction method for planar closed-loop precision bar system
  • Assembly precision prediction method for planar closed-loop precision bar system

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Experimental program
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Effect test

Embodiment 1

[0054] For a plane closed-loop precision rod system, after determining its assembly sequence, the first assembly unit is first judged according to the assembly sequence, as shown in Figure 4 As shown, when it is judged that the assembly unit is not a single-bar connection unit but a double-bar connection unit, the error model of the double-bar connection is matched, and the assembly error of the assembly unit is obtained as When it is judged that the assembly unit is a single-bar connection unit, continue to judge whether it is a redundant single-bar member. When it is judged to be a single-bar connection unit, match the single-bar connection error model, and the assembly error of the assembly unit is obtained as When it is judged that there are redundant rod connections, the assembly error of the assembly unit is obtained without considering the link gap as

[0055] When the assembly unit is assembled, judging whether the precision rod system is assembled can be determin...

Embodiment 2

[0057] For a plane closed-loop precision rod system, after determining its assembly sequence, the first assembly unit is first judged according to the assembly sequence, as shown in Figure 5 As shown, when it is judged that the assembly unit is not a single-bar connection unit but a double-bar connection unit, the error model of the double-bar connection is matched, and the assembly error of the assembly unit is obtained as When it is judged that the assembly unit is a single-bar connection unit, continue to judge whether it is a redundant single-bar member. When it is judged to be a single-bar connection unit, match the single-bar connection error model, and the assembly error of the assembly unit is obtained as When it is judged that there are redundant rod connections, in the case of considering the link gap, the static force balance analysis is carried out to obtain Si, and the assembly error of the assembly unit is further obtained as

[0058] When the assembly unit ...

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Abstract

The invention discloses an assembly precision prediction method for a planar closed-loop precision bar system. The method includes: establishing a basic assembly unit error model; determining a reference rod or a reference structure of the planar closed-loop precision bar system, and establishing a structural assembly sequence for planar closed-loop precision bar systems in any topological structures; according to the bar system structural connection assembly sequence, matching a bar system assembly type at each step with the basic assembly unit error model in the step 1, and performing errorcalculation; determining pose errors to complete assembly precision prediction. The problem of overlong assembly period caused by 'blind assembly' and 'blind adjustment' in an existing planar closed-loop precision bar system assembly process is solved.

Description

technical field [0001] The invention belongs to the technical field of prediction of assembly accuracy of a plane precision rod system, and in particular relates to a method for predicting the assembly accuracy of a plane closed-loop precision rod system. Background technique [0002] With the improvement of product quality requirements for precision, the geometric precision of precision mechanical products in engineering practice has been paid more and more attention. Therefore, in order to meet the high-precision requirements and achieve accurate prediction of precision, error analysis and precision modeling of precision machinery products are extremely important. However, the complex structure of the planar closed-loop precision link mechanism has the characteristics of multiple closed loops, ring constraint coupling, numerous parameters and high nonlinearity, which makes its precision modeling relatively complicated. [0003] The plate-type satellite antenna deployment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 洪军赵强强郭俊康刘志刚余德文赵鼎堂
Owner XI AN JIAOTONG UNIV
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