Piezoelectric type variable stiffness and variable damping dynamic vibration absorber

Abstract

The invention discloses a piezoelectric type variable stiffness and variable damping dynamic vibration absorber. The dynamic vibration absorber comprises an upper bearing platform and a lower bearingplatform; a mass inertia block and a plurality of vibration absorbing units are arranged between the upper bearing platform and the lower bearing platform; the lower bearing platform is fixedly connected with equipment awaiting vibration damping; and each vibration absorbing unit comprises two first piezoelectric elements, a friction lever, a plurality of vertical elastic elements and a second piezoelectric element, wherein the two first piezoelectric elements are arranged on the upper bearing platform and the lower bearing platform correspondingly, the two ends of the friction lever are connected with the two first piezoelectric elements, and the middle part of the friction lever penetrates through the mass inertia block, the two ends of each of the multiple vertical elastic elements areconnected with the mass inertia block and the first piezoelectric elements, and the second piezoelectric element is arranged on the joint face of the friction lever and the mass inertia block. The dynamic vibration absorber disclosed by the invention has the advantages that the stiffness coefficient and the damping coefficient of the vibration absorber can be designed according to the vibration characteristics of the equipment; stiffness and damping can be adjusted by controlling voltage; the dynamic vibration absorber can be effectively applied to architectural and mechanical equipment variedin vibration property; semi-active control over vibration can be realized; and a good vibration damping effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of equipment vibration reduction, and in particular relates to a piezoelectric variable-stiffness variable-damping dynamic shock absorber. Background technique [0002] With the development of mechanical equipment, high-precision mechanical equipment needs to effectively control the vibration inside the equipment. In the prior art, to control the single vibration of the structure, a one-way dynamic vibration absorber whose vibration direction is consistent with the vibration direction of the structure is used for processing. However, the effective range of the existing dynamic vibration absorber needs to be determined in advance, its operating parameters cannot be changed once it is designed, its natural frequency cannot be adjusted, and the effective vibration reduction frequency band is relatively narrow. In addition, the damper used in the dynamic shock absorber is a hydraulic piston cylinder, which has ...

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Problems solved by technology

However, the effective range of the existing dynamic vibration absorber needs to be determined in advance, its operating parameters cannot be changed once it is designed, the natural frequency cannot be adjusted, and the frequency band of effective vibration reduction is narrow

In addition, the damper used in the dynamic shock absorber is a hydraulic piston cylinder, which has a complex structure and mechanical wear, which seriously affects the durability and service life of the device

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