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Spatial harmonic reducer multi-performance parameter accelerated degradation test evaluation method

A technology of accelerated degradation test and harmonic reducer, which is applied in the fields of instruments, design optimization/simulation, electrical digital data processing, etc.

Pending Publication Date: 2021-04-13
BEIHANG UNIV
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Problems solved by technology

However, there is no report on how to consider the influence of cognitive uncertainty in the modeling process of accelerated degradation tests such as harmonic reducers with multiple performance parameter degradation characteristics.

Method used

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  • Spatial harmonic reducer multi-performance parameter accelerated degradation test evaluation method
  • Spatial harmonic reducer multi-performance parameter accelerated degradation test evaluation method
  • Spatial harmonic reducer multi-performance parameter accelerated degradation test evaluation method

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Embodiment Construction

[0076] Such as figure 2 As shown, the multi-performance parameter accelerated degradation test evaluation method of the harmonic reducer of the space drive mechanism proposed in this embodiment includes the following steps:

[0077] S1: For a batch of harmonic reducers, select the test samples, and obtain the performance degradation value of each test sample at each degradation detection moment under each acceleration stress;

[0078] The performance degradation data for each sample tested is:

[0079]

[0080] Among them, t i,j,l Indicates the l-th degradation detection moment of the j-th sample under the i-th accelerated stress level (two performance parameters are tested at the same time), i=1,2,...,N, j=1, 2,...,n i , l=1,2,...,m i , N represents the number of accelerated stress levels, n i Indicates the number of tested samples under the i-th stress level, m i Indicates the total number of tests for each sample tested at the i-th accelerated stress level; Deno...

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Abstract

The invention belongs to the technical field of acceleration tests, and particularly relates to a space driving mechanism harmonic reducer multi-performance parameter accelerated degradation test evaluation method, which comprises the steps of obtaining a performance degradation value of each tested sample at each degradation detection moment under each acceleration stress; carrying out normalization processing on each performance degradation value; carrying out uncertain process modeling on the performance degradation process under the acceleration stress level, and constructing a system degradation equation; establishing a relationship between the normalized performance degradation data and the reliability; performing comprehensive trade-off optimization on all unknown parameters of the system degradation equation by using an uncertainty statistical analysis method; and solving a system margin equation, an unreliability distribution function and a reliability measurement equation of a corresponding space harmonic reducer product by combining the threshold values of the performance parameters. According to the method, the problem of cognitive uncertainty quantification caused by a small number of test samples and limited performance detection times in a multi-performance parameter accelerated degradation test of the harmonic reducer is solved.

Description

technical field [0001] The invention belongs to the technical field of accelerated tests, in particular to an accelerated degradation test evaluation method for multiple performance parameters of a harmonic reducer of a space drive mechanism. Background technique [0002] The harmonic reducer is a key moving part that affects the performance of the space drive mechanism. It is mainly composed of a rigid spline, a flex spline and a wave generator, and relies on the elastic deformation of the intermediate flexible member to achieve power transmission. The main principle is that through the continuous rotation of the wave generator, the flexible spline produces continuous elastic deformation, so that the teeth between the flexible spline and the rigid spline continuously repeat the process of "engagement-engagement-engagement-disengagement". This is to transmit the meshing motion to achieve the deceleration effect. The transmission accuracy index of the harmonic reducer mainly...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/17G06F119/02G06F119/04G06F119/14
CPCG06F30/20G06F30/17G06F2119/14G06F2119/04G06F2119/02
Inventor 孙富强付方友郭宏轩
Owner BEIHANG UNIV
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