导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA

    Next Articles

An integrated Active and passive Stewart vibration damping system based on polygonal Diaphragm spring and piezoelectric actuator

  

  • Received:2020-07-16 Revised:2020-12-01 Online:2020-12-03 Published:2020-12-03

Abstract: With the continuous improvement of the accuracy of remote sensing satellite optical imaging equipment, its re-quirements on vibration environment are also getting higher and higher, and the simple linear passive Stewart plat-form can no longer meet the stringent requirements for use. A new integrated active and passive Stewart vibration damping platform based on the composite of polygonal diaphragm spring and piezoelectric actuator is presented. Its vibration isolation leg is mainly composed of polygonal diaphragm spring, piezoelectric actuator, force sensor and flexure hinge. There is an inherent contradiction between the high static stiffness and the low dynamic stiffness in the traditional linear vibration isolator. As the key component of the vibration isolator, the polygonal diaphragm spring proposed in this paper has the characteristics of high-static-low-dynamic (HSLD). It can make the vibration isolation system have high static stiffness for static loading and low dynamic stiffness for dynamic vibration reduc-tion. In order to reduce the amplitude of the resonance peak in the passive vibration isolation system, an active con-trol element consisting of a piezoelectric actuator and a force sensor is connected in series on the basis of the pas-sive diaphragm spring element to control the active vibration. The simulation results show that the active control system using the PIF feedback control algorithm can not only reduce the peak value of resonance (11.9 dB) by building the effect of ceiling damping through the integral force link in frequency domain, but also increase the mass matrix term, effectively reduce the natural frequency (20.9Hz) of the damping system and broaden its damp-ing effect. At the same time, it can maintain the high attenuation of the high frequency band. In the time domain, it can also reduce the acceleration vibration amplitude of the system from ± 0.6g to ± 0.07g, and the vibration attenu-ation reaches 88%.

Key words: Vibration damping system, Diaphragm spring, Stewart platform, Proportional integral force algorithm, Feed-back control

CLC Number: