Dynamics Analysis of Active Variable Stiffness Vibration Isolator for Whole-Spacecraft Systems Based on Nonlinear Output
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ISSN 1860-2134
Dynamics Analysis of Active Variable Stiffness Vibration Isolator for Whole-Spacecraft Systems Based on Nonlinear Output Frequency Response Functions Kefan Xu1
Yewei Zhang1
Yunpeng Zhu2
Jian Zang1
Liqun Chen3
1
( College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, China) (2 Department of Automatic Control and Systems Engineering, Sheffield University, Mapping Street, Sheffield S1 3JD, UK) (3 Harbin Institute of Technology, Shenzhen 518055, China)
Received 3 August 2020; revision received 12 October 2020; Accepted 14 October 2020 c The Author(s) 2020
ABSTRACT In order to improve the harsh dynamic environment experienced by heavy rockets during different external excitations, this study presents a novel active variable stiffness vibration isolator (AVS-VI) used as the vibration isolation device to reduce excessive vibration of the whole-spacecraft isolation system. The AVS-VI is composed of horizontal stiffness spring, positive stiffness spring, parallelogram linkage mechanism, piezoelectric actuator, acceleration sensor, viscoelastic damping, and PID active controller. Based on the AVS-VI, the generalized vibration transmissibility determined by the nonlinear output frequency response functions and the energy absorption rate is applied to analyze the isolation performance of the whole-spacecraft system with AVS-VI. The AVS-VI can conduct adaptive vibration suppression with variable stiffness to the whole-spacecraft system, and the analysis results indicate that the AVS-VI is effective in reducing the extravagant vibration of the whole-spacecraft system, where the vibration isolation is decreased up to above 65% under different acceleration excitations. Finally, different parameters of AVS-VI are considered to optimize the whole-spacecraft system based on the generalized vibration transmissibility and the energy absorption rate.
KEY WORDS Vibration isolation, Active variable stiffness vibration isolator, Nonlinear output frequency response functions (NOFRFs), Transmissibility
1. Introduction In the field of aerospace engineering, harsh vibration environment has become a principal factor restricting the development of spacecraft and space exploration activities [1]. The extreme dynamic environment of heavy launch vehicles is one of the main reasons for the launch failure of the entire satellite system [2]. Therefore, reducing the effects of the satellite vibration environment is critical to improving the safety and reliability of satellite launches [3]. The whole-spacecraft vibration isolation usually requires a redesign of the adaptor with vibration isolation performance, but without changing the original structure of the satellite, or introduction of vibration isolation devices between the carrier rocket and the satellite [4]. A vibration isolator installed
Corresponding author. E-mail: [email protected]
ACTA MECHANICA SOLIDA SINICA
between the adapter and the payload to isolate the vibration load has been widely studied [5]. In general, the commonly used vibrati
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