Combined stress acceleration life test method of spaceflight drive assembly

A technology for accelerated life test and drive components, which is used in the testing of mechanical components, the testing of machine/structural components, measuring devices, etc. It can solve the problems of the lack of accelerated life test design methods for aerospace drive components, and achieve obvious acceleration effects. Effect

Inactive Publication Date: 2012-05-09
BEIHANG UNIV
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Problems solved by technology

In view of the closed policy adopted by foreign countries on my country's related technologies, we have no way of knowing how to design accelerated life tests for foreign aerospace drive components, and my country's research on accelerated life tests for aerospace drive components has just started. Accelerated Life Test Design Method for Applied Aerospace Drive Components

Method used

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  • Combined stress acceleration life test method of spaceflight drive assembly
  • Combined stress acceleration life test method of spaceflight drive assembly
  • Combined stress acceleration life test method of spaceflight drive assembly

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Embodiment

[0043] Using the method of the present invention to conduct a comprehensive stress accelerated life test on a certain type of harmonic gear reducer is as follows:

[0044] Harmonic gear reducer is an important aerospace drive component. Due to its advantages of large transmission ratio, small size and high transmission precision, it is widely used in spaceborne antenna deployment mechanisms and other occasions.

[0045] 1) Select accelerated stress.

[0046] The main failure modes of the harmonic gear reducer are the following five types: the viscosity of the grease increases at low temperature, which leads to the increase of the driving torque, the fatigue fracture of the flex spline, the wear of the tooth surface, the slippage of the gear teeth or the wave generator, and the gear The flow of the surface, in which the fatigue fracture of the flexspline is the most important failure mode.

[0047] The environmental stresses that the harmonic gear reducer bears mainly include ...

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Abstract

The invention, which belongs to the spaceflight drive assembly reliability and life evaluation field, relates to a combined stress acceleration life test method of a spaceflight drive assembly. According to the method, an acceleration stress is selected; an acceleration testing profile is determined and as a result, a combined stress acceleration life testing profile is employed; testing samples are selected and the number of samples is determined; fault determination and a testing period are determined; testing stop time is determined; and according to data obtained by the above-mentioned testing process, a life characteristic value of the spaceflight drive assembly is evaluated. According to the method, a combined stress is employed to carry out acceleration life testing and an acceleration effect is obvious; therefore, rapid evaluation on reliability and life of the spaceflight drive assembly is realized.

Description

technical field [0001] The invention belongs to the field of reliability and life evaluation of aerospace drive components, and in particular relates to a comprehensive stress accelerated life test design method for aerospace drive components. Background technique [0002] According to the statistical data of foreign satellites, the "stuck" caused by poor lubrication of the driving components is one of the main reasons for the failure of satellites, and the friction and wear of the driving components is the key reason for the decline in the performance of the rotating mechanism. Aerospace drive components are key products that restrict the long-life in-orbit flight of satellites, and their high reliability and long life are crucial to the development and use of new long-life satellites. [0003] Usually the life characteristics of products are obtained by doing life tests under normal conditions. However, for aerospace drive components, if the conventional life test method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
Inventor 张超王少萍
Owner BEIHANG UNIV
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