Optimization design and analysis for the mechanical test platform of scientific probe module of the Cool Planet Imaging Coronagraph

TL;DR

This paper presents an optimized design and analysis of a mechanical test platform for a scientific probe module of the Cool Planet Imaging Coronagraph, ensuring it meets frequency and vibration requirements for space applications.

Contribution

It introduces a response surface modeling approach combined with modal and vibration analysis for optimizing the structural design of space instrument test platforms.

Findings

Fundamental frequency of the test platform is 436.2Hz, exceeding the 300Hz requirement.

The response surface model accurately predicts the platform's dynamic behavior.

The design methodology provides a theoretical basis for Chinese space station structural design.

Abstract

This paper optimizes the design and analysis of the mechanical test platform for the scientific probe module of the Cool Planet Imaging Coronagraph, which is the fifth part of the China Space Station survey Telescope. First, according to the module layout and economic requirements, the preliminary structural design of the module mechanical test platform is carried out, and the stiffness sensitive parameters of the assembly are identified to determine the optimization parameters. The Central Composite Design method is used to design the test platform, and a third-order regression model is constructed for response surface analysis. The third-order response surface model of the fundamental frequency and amplitude of the test platform is obtained by fitting the test data with the least squares method, and the structure of the module mechanical test platform is determined. The modal analysis is carried out to determine the fundamental frequency and vibration modes of the mechanical test platform. The vibration response of the platform is simulated by sine, random and swept frequency vibration simulations. The response surface fitting algorithm is verified by the test platform swept frequency test. The agreement between the response surface fitting algorithm and the experiment is good. The fundamental frequency of the test platform is 436.2Hz (>300Hz), which meets the design index requirements of the test platform and can accurately guide the optimization design work. At the same time, it provides the theoretical basis and design method for the structural design of the Chinese manned space station.