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Design and Application Study of a Novel Piezoceramic-Rubber Integrated Vibration Isolator

Author: WangQiang
Tutor: ChenZhaoBo
School: Harbin Institute of Technology
Course: Mechanical Design and Theory
Keywords: Active vibration control Active vibration isolation Piezoceramic-rubber integrated vibration isolator PID control strategy
CLC: TB535.1
Type: Master's thesis
Year: 2009
Downloads: 142
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Abstract


Precision instruments are the important promise of spacecraft working successfully. They suffered from the vibration interrupt during launch and on-orbit running. In order to improve the dynamics environment, some vibration control methods should be done to control the vibration interrupt. Pure passive vibration control methods have been proved can’t meet the requests. A novel piezoceramic-rubber integrated vibration isolation plan is proposed. The piezoceramic-stacks actuator is the active component of the integrated vibration isolator. And a T forms rubber isolator is used to as the passive component of the integrated vibration isolator. Emulation results show that the integrated vibration isolation system is effectively on all range of frequency and all kinds of signals input.Start form the one-dimensional piezoelectric equation, the driven equation of the piezoceramic slice and piezoceramic-stacks have been calculated. The piezoceramic actuator is designed on this base. The rubber part of the integrated isolator has also been designed. And now all parts of the integrated vibration isolator have been obtained.A detailed discussion is given on the influencing factors of dynamics character of the piezoceramic-stacks actuator. An equivalent dynamics model of the actuator has been given. At the same time, a complex number-stiffness model of the rubber isolator of the integrated vibration isolator to characterized the dynamics performance. The dynamics model of the integrated vibration isolator is the base of controller design and experimentation.A series of experimentations was designed and carried out to obtain the static and dynamic characteristics of the piezoceramic-stacks actuator and the rubber isolator. The experiment results show that the integrated vibration isolator has a stably dynamics output. It is the ideal isolator for the vibration control of precision instruments used on the spacecraft.Various feedback control types have been discussed for their influence on Single degree of freedom vibration system. Finally, a PID controller with input feedforward and output feedback is designed to control this vibration isolation system. The transfer function of the system is calculated. Emulation study is carried out with pulse signal, harmonic wave Signal and Random signal input. The emulation results show that the integrated vibration isolation system is effectively on all kinds of the signal input and all range of the frequency.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use > Vibration isolation, damping materials and structures
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