Research on Microvibrations Generated by a Control Moment Gyroscope on a Flexible Interface Based on a Dynamic Substructure Method

Abstract

Microvibrations generated by a control moment gyroscope (CMG) will couple with a flexible spacecraft structure, and this seriously degrades certain point performances of a spacecraft. This study focuses on investigating the coupled microvibrations caused by a CMG on a flexible interface by using a dynamic substructure method (DSM). First, a DSM based on a frequency response function (FRF) is established, and this method is used to simultaneously synthesize multiple substructures with different coordinates irrespective of whether their connection interfaces are rigid or flexible. Second, the bearings and the gimbal servo system are simplified into linear springs, and therefore the CMG model is equivalent to a mass-spring-damping system with eighteen degrees of freedom (DOFs). Third, the established DSM is employed to deduce the FRF matrix of the CMG-flexible interface coupling system that consists of CMG mounted on an aluminum honeycomb sandwich palate (AHSP). Dynamic responses of the coupling system are calculated by the derived FRF matrix. Finally, MATLAB and multibody dynamics simulations are conducted to analyze and validate the dynamic responses of the coupling system obtained by the DSM. The results indicate that the DSM is appropriate to predict the coupled microvibrations of CMG on a flexible interface and exhibits high prediction accuracy and computational efficiency.

Micro-Vibration Analysis, Suppression, and Isolation of Spacecraft Flywheel Rotor Systems: A Review

“…On this basis, Shi et al [97] adopted Luo's analytical mode for the analysis and design of an SGCMG vibration isolation platform. Li et al [98] studied the micro-vibration characteristics of CMG combined with the dynamic test results, and analyzed the influence of a flexible interface on the micro-vibration characteristics of CMG using the dynamic substructure method [99]. Through modal test and frequency response analysis, Wu et al [100] studied the transmission characteristics of micro vibration of CMG.…”

Application of the Substructure Method in Direct Calculation of Hull Structures

“…Chen et al used a substructure-based frequency response function method to establish a dynamic model of the submarine's elastic propeller-shaft-ship body system for longitudinal and lateral coupled vibrations and studied the correctness and feasibility of the method [6]. Li used finite element and dynamic substructure methods to study the impact response characteristics of ship compartment sections [7]. Zou and Wu used the substructure method to analyze and verify the fluid-structure coupling dynamics of ship structures through the integration of the main hull and substructures [8].…”

Analysis and Experimental Study on Dynamic Behavior of Stepper-Actuated Dual-Axis Data Transmission Antenna

“…In order to improve the imaging quality of high-resolution remote sensing satellite, the stability requirements of remote sensing satellite are constantly raised [1]. But there are control moment gyroscope, momentum wheel, solar array and solar array drive assembly, data transmission antenna, and other moving parts on the satellite [2][3][4][5]. When the satellite is in orbit, the moving parts will cause microvibration.…”