Benefit of Relaxation-Type Damping on the Performance of a Six-Degree-of-Freedom Microvibration Isolation Device for Control Moment Gyroscope

Xingtian Liu,Xiangsen Kong,Changbao Shao,Liping Zhou

doi:10.1155/2021/6690192

Xingtian Liu, Xiangsen Kong + Show 2 more

Open Access

https://doi.org/10.1155/2021/6690192

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Abstract

In order to provide an ultraquiet environment for spacecraft payload, a six-degree-of-freedom microvibration isolation device for satellite control moment gyro (CMG) is proposed in this paper. The dynamic characteristics of the microvibration isolation device are analyzed theoretically and experimentally. The dynamic equations of the microvibration suppression device are established by using the Newton–Euler method. The dynamic responses are numerically solved and the frequency-domain characteristics of the microvibration isolation device under base excitation are analyzed. The analytical results are first verified numerically, and the two results are in good accordance. The experimental apparatus is built, and the vibration isolation performance is investigated. The acceleration transfer function is measured and the influence of the excitation amplitude on the vibration isolation performance is performed. It is shown that the amplification factor at the vicinity of the resonance frequency is within 10 dB, and the vibration isolation performance is significant at higher frequencies. The vibration attenuation performance at the main frequency of the CMG (100 Hz) is more than 30 dB. The microvibration suppression device can effectively suppress the microvibration generated by CMG during orbital operation.

Highlights

Remote sensing or observation of the Earth is one of the most important tasks of satellite
In order to get an ultra-high-resolution image, many disturbances that affect the performance of the sensitive payload need to be controlled on board. e most annoying disturbance that degrades the performance of payload is thermal deflection [1, 2] of satellite structure and microvibration ejected by moving parts such as cryocooler [3,4,5], flywheel [6, 7], and control moment gyroscope (CMG) [8]
2.1. e Microvibration Isolation Device. e Stewart-type structure is used very popularly to get vibration isolation performance in six degrees of freedom [21]. e schematic of the proposed microvibration isolation device for single CMG in this paper is shown in Figure 1, which is based on a Stewart-type structure. e platform includes upper platform to connect with the CMG and the lower platform to be installed on the satellite

Summary

Introduction

Remote sensing or observation of the Earth is one of the most important tasks of satellite. In a recently published paper [9], the on-orbit microvibration measurement in a remotesensing satellite shows that flywheel and CMG are the main vibration source. Many microvibration suppression methods including vibration source control and payload isolation [10] are employed to achieve the purpose. Zhang et al [16, 17] proposed a new method to achieve better image quality of optical payload. In their research, both the control strategy and the passive vibration source isolation are implemented. The dynamic model of the proposed vibration isolation device based on a relaxation-type damper is deduced using Euler–Newton method.

Dynamic Modeling

The Experiment

Findings

Conclusions