Abstract
In order to obtain better vibration suppression effect, this paper designs a semiactive/fully active hybrid isolator by using magnetorheological elastomer (MRE) and piezoelectric material. Combined with multimode control scheme, full frequency vibration suppression is achieved. Firstly, series type structure is determined for the hybrid isolator, and the structure of hybrid isolator is designed. Next, the dynamic model of hybrid isolator is derived, the dynamic characteristics measurement for MRE isolator and piezoelectric stack actuator (PSA) is established, and parameters such as voltage-displacement coefficient, stiffness and damping constant are identified from the experimental results, respectively. Meanwhile, the switch frequency is determined by experimental results of PSA and MRE isolator. Lastly, influence of the stiffness of MRE, control voltage of PSA, and intermediate mass on hybrid isolator system is analyzed by simulations, and the results show that the hybrid isolator proposed is effective.
Highlights
Along with the development of micro-nano-fabrication and precision measurement technology, how to reduce effectively the adverse effects of vibration has become a difficult and hot problem [1]
In view of the above problems, this paper proposes the semiactive/fully active hybrid isolator with combination between magnetorheological elastomer (MRE) and piezoelectric stack actuator (PSA), which corresponds to the combination between many “passive” isolators and active vibration isolator, and the “passive” isolator can be adjusted arbitrarily with some stiffness and damping
The dynamic model of hybrid isolator is established, the dynamic characteristics measurement for MRE isolator and PSA is established, the switch frequency is obtained, and parameters such as voltage-displacement coefficient and stiffness and damping constants are identified from the experimental results, respectively
Summary
Along with the development of micro-nano-fabrication and precision measurement technology, how to reduce effectively the adverse effects of vibration has become a difficult and hot problem [1]. The piezoelectric actuator features fast response speed, small stroke, compact structure, and high force generation It has large energy consumption, poor stability, and high frequency suppression effects. The dynamic model of hybrid isolator is established, the dynamic characteristics measurement for MRE isolator and PSA is established, the switch frequency is obtained, and parameters such as voltage-displacement coefficient and stiffness and damping constants are identified from the experimental results, respectively. The microvibration control method proposed in this paper is a helpful exploration, which covers the stability, the controllability, and the advantages of good dynamic characteristics and large output force, realizes the effective attenuation band of all band microvibrations including ultralow frequency vibration, and solves the vibration problems of micronanoprocessing caused by uncertain excitation. The volume and quality of vibration isolator can be reduced
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