Space flexible mechanism dynamic reliability analysis method based on PSO

A technology of particle swarm algorithm and flexible mechanism, applied in calculation, calculation model, special data processing application, etc., can solve problems such as inaccurate results

Inactive Publication Date: 2014-08-27
BEIHANG UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to provide a dynamic reliability analysis method for space flexible mechanisms based on particle swarm optimization, which solves the problem that the classic time-varying reliability analysis results based on the up-passing theory for long-lived space flexible mechanisms in orbit are not accurate enough. For practical problems, on the basis of analyzing the time-varying reliability by using the up-passing theory, adopting the particle swarm optimization strategy can significantly improve the accuracy of the time-varying reliability analysis, forming a set of particle swarm optimization algorithm and up-passing rate method, aiming at High-precision time-varying reliability analysis method for space-rail flexible mechanism

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  • Space flexible mechanism dynamic reliability analysis method based on PSO
  • Space flexible mechanism dynamic reliability analysis method based on PSO
  • Space flexible mechanism dynamic reliability analysis method based on PSO

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[0123] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0124] Task description: The time-varying reliability analysis problem of harmonic reducer based on wear.

[0125] The dual-axis drive mechanism is an important part of the space satellite antenna mechanism, and its reliability level is directly related to the safety of the satellite antenna mechanism and the reliability of task completion. The harmonic reducer is an important part of the biaxial drive mechanism and plays a role in power transmission in the satellite antenna. It is mainly composed of a rigid gear with an inner gear, a flexible wheel with an outer gear and a wave generator. attached figure 1 shown.

[0126] When the wave generator rotates in the flexspline, it forces the flexspline to produce continuous elastic deformation. At this time, the continuous rotation of the wave generator makes the four states of the flexspline t...

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Abstract

The invention discloses a space flexible mechanism dynamic reliability analysis method based on PSO. The space flexible mechanism dynamic reliability analysis method includes the specific steps of (1) building a time-variation reliability model of an in-orbit space flexible mechanism according to the reliability modeling theory, (2) carrying out time discretization on the time-variation reliability model, and dividing the time-variation reliability model into a plurality of time points t1, t2, ..., tn, (3) building performance functions corresponding to the time points, and then building an association coefficient rou(t, t+deltat) between t and t+deltat by deriving normal vectors of the performance functions, (4) obtaining reliability coefficients beta1, beta2, ..., betan with the PSO, (5) calculating the up-crossing rate in cooperation with the association coefficient rou(t, t+deltat) between t and t+deltat, and (6) calculating the failure probability with the up-crossing rate method. By means of the space flexible mechanism dynamic reliability analysis method, the accuracy of a high-dimensional nonlinear flexible time-variation reliability analysis result is improved.

Description

technical field [0001] The invention relates to a dynamic reliability analysis method of a space flexible mechanism based on a particle swarm optimization algorithm, which is a dynamic reliability analysis method for a long-life in-orbit space flexible mechanism based on a particle swarm optimization algorithm, belonging to aerospace and general machinery The field of engineering reliability technology. Background technique [0002] The operation of space flexible mechanism in orbit is a typical dynamic process, and its parameters such as load, working condition, stress and environment are time variables. Due to long-term in-orbit service and accumulation of wear effects, the reliability design analysis of long-life on-orbit space mechanisms has attracted the attention of engineers and researchers in the aerospace field. [0003] Due to the wear effect of long-term service and the high-dimensional nonlinear problem in the process of rigid-flexible coupling between rigid par...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G06N3/00
Inventor 张建国司建磊王丕东刘博
Owner BEIHANG UNIV
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