A method for applying prestress to a piezoelectric actuator

A piezoelectric driver and prestressing technology, applied in the direction of piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve problems such as application, improve accuracy, and solve prestressing The effect of imposing the problem

Active Publication Date: 2020-02-21
CHINA HELICOPTER RES & DEV INST
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Problems solved by technology

This method effectively solves the problem of applying the prestress of the piezoelectric actuator in the project and improves the accuracy

Method used

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  • A method for applying prestress to a piezoelectric actuator
  • A method for applying prestress to a piezoelectric actuator
  • A method for applying prestress to a piezoelectric actuator

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Embodiment Construction

[0024] The purpose of the present invention is to find a method for applying the prestress of the piezoelectric driver, solve the problem of applying the prestress of the piezoelectric driver in engineering, and improve the precision.

[0025] The technical solution of the present invention is: a method for applying prestress to a piezoelectric actuator, which adopts an interference fit method to establish the deformation coordination relationship between the piezoelectric ceramic stack and the magnifying frame, and when calculating the deformation of the piezoelectric ceramic stack, comprehensively consider Due to the influence of the electromechanical coupling effect of the piezoelectric ceramic stack caused by the prestress on the deformation of the piezoelectric ceramic stack, the relationship between the prestress and the amount of interference is finally established, and finally the application of the prestress is realized through interference assembly.

[0026] The inven...

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Abstract

The invention provides a method for applying a pre-stress of a piezoelectric actuator. The piezoelectric actuator comprises a piezoelectric ceramic stack and a magnifying frame, and realizes the application of the pre-stress by means of interference assembly between the piezoelectric ceramic stack and the magnifying frame. The determination of an interference magnitude comprises the steps of: step1, calculating the stiffness of the magnifying frame in a driving direction of the piezoelectric ceramic stack; step 2, determining a deformation compatibility relationship between the magnifying frame and piezoelectric ceramics; step 3, calculating an induced electric field generated by the pre-stress; step 4, determining piezoelectric stack strain under the electromechanical coupling effect; step 5, and returning to the step 2, and determining a relationship between the interference magnitude and the force. The method effectively solves the problem of application of the pre-stress of the piezoelectric actuator in engineering, and improves the precision.

Description

technical field [0001] The invention belongs to the technical field of designing a piezoelectric driver for a helicopter blade, and in particular relates to a method for applying prestress to a piezoelectric driver. Background technique [0002] Piezoelectric material is a kind of intelligent material that can realize the conversion of electrical energy and mechanical energy. It has outstanding characteristics such as small energy loss, fast response speed, controllable frequency bandwidth, and high energy conversion efficiency. The piezoelectric actuator with the piezoelectric ceramic stack as the main component is a device that amplifies the relatively small strain of the piezoelectric ceramic stack by 2 to 20 times through the magnifying frame to reach the usable range. The piezoelectric ceramic stack is particularly sensitive to tensile stress, so it is necessary to avoid the tensile stress of the piezoelectric ceramic stack as much as possible in the working environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/04
CPCH02N2/04
Inventor 高乐胡和平邓旭东宋彬张仕明周云孟微
Owner CHINA HELICOPTER RES & DEV INST
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