Laminated type PVDF actuator and active and passive hybrid vibration isolator

Abstract

The invention discloses a laminated type PVDF actuator comprising multilayer PVDF piezoelectric film units. PET films are adhered to the two sides of the multilayer PVDF piezoelectric film units. In the multilayer PVDF piezoelectric film units, directions of polarization of two adjacent layers of PVDF piezoelectric films are opposite, and the two adjacent layers of the PVDF piezoelectric films are mutually adhered via epoxy resin layers. Conductive lead wires are respectively led out of all layers of the PVDF piezoelectric films in the multilayer PVDF piezoelectric film units and between the PVDF piezoelectric films and the PET films. All conductive lead wires are mutually connected in a spacing way so that a first electrode and a second electrode are formed respectively. Besides, the invention discloses an active and passive hybrid vibration isolator on the basis of the laminated type PVDF actuator. Compared with common passive vibration isolators, vibration in wide frequency range and particularly vibration near natural frequency of the system can be more effectively isolated by the vibration isolator so that appropriate working environment of the instrument is ensured. Meanwhile, volume, mass and structure of the vibration isolator are smaller than those of the passive vibration isolators.

Description

technical field [0001] The invention relates to a vibration isolation device based on piezoelectric materials, in particular to an actuator laminated by multilayer piezoelectric films, and to an active and passive hybrid vibration isolator based on the laminated PVDF actuator. Background technique [0002] In modern engineering practice, the work of various instruments and equipment is often affected by vibration, which greatly affects the working life, stability and accuracy of various instruments. In order to ensure the normal operation of the instrument and equipment, it is necessary to install vibration isolation equipment. [0003] Vibration isolators are devices that can effectively isolate vibration within a certain frequency range. They are generally divided into three types, namely passive vibration isolators, active vibration isolators and active-passive hybrid vibration isolators. [0004] Passive vibration isolators are usually composed of passive components suc...

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Problems solved by technology

[0004] Passive vibration isolators are usually composed of passive components such as rubber and springs. It has the advantages of no energy supply, low cost, easy engineering implementation, good high-frequency vibration isolation effect, and high system reliability. However, it also has significant disadvantages: There is no vibration isolation effect in the low frequency area, and even the vibration will be amplified near the natural frequency of the system

However, the volume of the piezoelectric stack is relatively large, and it has a metal casing. The volume of a typical packaged piezoelectric stack actuator reaches 15mm×15mm×80mm, and the mass exceeds 100g. In this way, the piezoelectric stack actuator is installed on the original structure. , which not only increases the volume and mass of the original structure significantly, but also changes various properties of the original structure.

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