Bidirectional piezoelectric ceramic and electrorheological fluid self-coupling damper

Abstract

The invention relates to a bidirectional piezoelectric ceramic and electrorheological fluid self-coupling damper. The damper is mainly composed of a piezoelectric energy supply part and a damping cavity part. Springs and pressure spring plates are symmetrically arranged relative to a set of piezoelectric ceramics. When a piston rod is subjected to external vibration, the pressure spring plates andthe springs which are symmetrically arranged up and down move along with the piston rod to apply pressure to the piezoelectric ceramics to generate voltage. In the compression and recovery two-way stroke, the piezoelectric ceramics are pressed all the time to generate the induced voltage and connected to an inner electrode and an outer electrode through wires, an electric field is generated between an annular damping channel, the viscosity of electrorheological fluids between the inner electrode and the outer electrode is increased under the action of the electric field, and an upper cavity and a lower cavity of the damper form pressure difference so as to reduce vibration of a piston. The larger the vibration amplitude of the piston is, the higher the generated voltage is, and the largerthe resistance generated by the electrorheological fluids is, so that the purpose of self-coupling vibration reduction of the system is achieved. According to the damper, the number of the piezoelectric ceramics is reduced, the effect of two-way power supply is still achieved, the utilization efficiency of the piezoelectric ceramics is improved, and the space is saved.

Description

technical field [0001] The invention relates to a novel electrorheological fluid damper, which is an intelligent damper capable of self-coupling and vibration reduction with the external vibration amplitude without external power supply during operation. Background technique [0002] Electrorheological fluids (ERF fluids) are smart materials, which are generally formed by uniformly dispersing micron (or nanometer)-scale particles with high dielectric constant in an insulating oil phase medium with low dielectric constant suspension. When an external electric field is applied, the ERF fluid changes from a flow state to a solid-like state, its apparent viscosity increases by several orders of magnitude, and reaches a higher shear stress. The process is reversible, controllable, rapid and low power consumption. These excellent electromechanical coupling properties enable ERF fluids to effectively solve energy transfer and control problems in mechanical engineering. In the pa...

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Problems solved by technology

The above two kinds of dampers have their own defects, so that the application is limited

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