Novel Piezoelectric Constrained Layer Damping Treatment And Its Application On Whole-spacecraft Vibration Isolation

Piezoelectric active constrained layer damping (PACLD) treatment combines their advantages of active vibration control and passive vibration control, so it is an efficient active-passive hybrid vibration control technology. Because piezoelectric material has direct and converse piezoelectric effect, piezoelectric constraining layer could not only connect feedback control system to make PACLD treatment, but also connect shunting circuit to make piezoelectric passive constrained layer damping (PPCLD) treatment.However, PACLD treatment and PPCLD treatment in the previous studies were two relatively independent research objects. Researchers either studied the PACLD treatment or studied the PPCLD treatment.Therefore, studying the vibration control mechanism of the PACLD treatment and the PPCLD treatment systematically, combining their advantages of the PACLD treatment and the PPCLD treatment to develop novel piezoelectric constrained layer damping (NPCLD) treatment, and exploring the application prospect of this NPCLD treatment in the WSVI boldly will play a positive role for the development of China aerospace industry.Accordingly, this paper, which is supported by advanced research project of the Commission of Science Technology and Industry for National Defense, studies the NPCLD treatment and its application on WSVI systematically. The main research contents and results involve the following aspects:Firstly, active-passive hybrid piezoelectric network (APPN) is studied. Results show that the APPN has better vibration control performance and higher reliability than pure active control. Besides, RL shunting circuit of the APPN is optimized and the roles of RL shunting circuit in the APPN are fully revealed in order to lay a solid foundation for investigating the NPCLD treatment.Secondly, two NPCLD treatments, hybrid APPN/PCLD treatment and hybrid APPN/PSOLD treatment, are proposed by combining their respective advantages of the PACLD treatment and the PPCLD treatment. Hamilton’s principle and Rayleigh-Ritz method are used to derive the dynamic models of these two NPCLD treatments. And the open-loop and closed-loop characteristics are analyzed respectively. Results show that both hybrid APPN/PCLD treatment and hybrid APPN/PSOLD treatment have better vibration control performance than the APPN and the PACLD treatment. Based on the above results, the minmax method is used to optimize the RL shunting circuit of the NPCLD treatment.Thirdly, robust control about the NPCLD treatment is investigated. Aiming at the problems in control system design (the system robustness and the contradiction between the system’s response speed and damping degree), a composite nonlinear feedback sliding mode control (CNFSMC) is proposed by combining the advantages of composite nonlinear feedback and sliding mode control. By comparing CNFSMC with traditional sliding mode control, it is shown that the CNFSMC not only could improve the contradiction between the system’s response speed and damping degree, but also has a great robustness for parameter perturbation. And then the CNFSMC is used to design robust controller for a class of matched uncertain system and a class of mismatched uncertain system, which make the application scope of the CNFSMC enlarge further. After that, the CNFSMC is used to design robust controller so as to perform the experiment researches about the NPCLD treatment.When using the CNFSMC to perform the experiment on the NPCLD treatment, the mathimatical models established by the mechanism analysis method generally cannot be used to describe the actual structures, also the state variables of the actual structures are usually unmeasured. So, this paper models the state-space expression of the actual structures by using eigensystem realization algorithm, and designs the state observer for the CNFSMC. After that, a cantilever beam is used as the actual controlled plant, and eigensystem realization algorithm with observable CNFSMC is used to perform the experiment of the cantilever beam with the NPCLD treatment. Results illustrate that the NPCLD treatment has better vibration control performance than pure active control and the PACLD treatment.Finally, the WSVI based on the NPCLD treatment is studied. The installation location and structural form of the NPCLD treatment on the satellite-launch vehicle system is proposed by simplifying the connect mode of the satellite-launch vehicle system. Then Hamilton’s principle and Rayleigh-Ritz method are used to derive the dynamic models of the simplified WSVI system. And analyses on the open-loop and closed-loop characteristics are performed to show the vibration control performance of the WSVI system. On these bases, the prototype of the WSVI system is designed and tested to demonstrate the feasibility and effectiveness of this design scheme.