Inertia-type hybrid vibration isolator based on piezoelectric stack

Abstract

The purpose of the present invention is to provide an inertial hybrid vibration isolator based on a piezoelectric stack, which includes an upper cover plate, a lower cover plate, an elastic bladder, and an active actuator. The lower cover is connected, and the lower cover is provided with air holes and wire holes that connect the inside and the outside of the elastic bladder. The active actuator includes a shell, a ball head-cone hole force transmission device, a piezoelectric stack, a force output rod, and an inertial mass block. The shell is fixed Below the upper cover plate, the shell is provided with a ball head-cone hole force transmission device, a piezoelectric stack, and a force output rod in sequence from top to bottom. The force output rod is sleeved with a pre-compression spring. The rod and the shell, the outer part of the shell and the force output rod is provided with an inertial mass. The invention can suppress the vibration of the vibration isolation object in a wider frequency domain, effectively making up for the shortcomings of the passive vibration isolator's small frequency domain control range and the low output force of the traditional piezoelectric stack actuator under low pressure.

Description

technical field [0001] The invention relates to a vibration damping device, in particular to an active and passive vibration isolation device. Background technique [0002] Vibration isolation technology is a commonly used technology in the field of vibration control. The traditional passive vibration isolation technology is widely used due to its advantages of simple structure, high working reliability and low maintenance cost. However, with the continuous development of science and technology, people have to increase the vibration of the environment and equipment, and passive vibration isolation has been difficult to meet the requirements. Considering active control through the introduction of active components is gaining more and more attention. [0003] Various vibration isolators are widely used in marine equipment, such as metal vibration isolators, rubber vibration isolators, air spring vibration isolators, airbag vibration isolators, etc. The airbag vibration isol...

AI Technical Summary

Problems solved by technology

The patent named "active-passive hybrid vibration isolator" with the publication number CN 102748425A combines the airbag vibration isolator with the electromagnetic actuator, but in order to increase the magnetic flux density and increase the output force, the armature and iron in the electromagnetic actuator The air gap between the cores should not be too large, so it is easy to be impacted and cause damage

The patent titled "An anti-shock active-passive hybrid vibration isolator" with the publication number CN104930113A adds an anti-shock spring device between the upper end cover and the iron core of the airbag vibration isolator, although the heat sink surrounds the iron core and the coil , the other end is attached to the lower end cover of the vibration isolator to dissipate heat, but there will still be a lot of heat that will be directly transferred from the heat sink to the air in the airbag. Working for a long time will definitely affect the stiffness of the airbag vibration isolator. This unstable factor Will cause the deterioration of the active control effect

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