Measuring system and method for mechanical quality factor of vibrating body

Abstract

The invention belongs to the technical field of mechanical quality factor measurement, and in particular relates to a measurement method and a measurement system for the mechanical quality factor of a vibrating body. Use the detection signal wave to drive the ultrasonic transducer to excite the vibration of the vibrating body, move the vibration measuring device along the axial direction of the vibrating body, measure the vibration velocity and phase of multiple particles at the ΔZ microelement spacing on the surface of the vibrating body, and measure the vibration of the particle on the vibrating body Do spatial Fourier transform of the velocity to obtain the frequency spectrum in the wavenumber space and determine the dominant wavenumber k 0 , remove 1.2k 0 For the above wave number, restore the distribution curve of the vibration velocity of the particle in space, and calculate the energy loss ΔE of the microelement d and the reactive energy ΔE of the element r , the corresponding relationship between the mechanical quality factor of the vibrating body and the amplitude of the vibrating body is obtained; the invention avoids the influence of the energy loss of the connector on the measurement result in principle, and ensures the measurement accuracy. The overall approach makes the whole calculation process simple and can be applied on a large scale.

Description

technical field [0001] The invention belongs to the technical field of mechanical quality factor measurement, and in particular relates to a measurement system and method for the mechanical quality factor of a vibrating body. Background technique [0002] Ultrasonic components are widely used in ultrasonic motors, ultrasonic sound sources and other equipment due to their advantages such as simple structure, high output power, small weight, and easy integration. Such as figure 1 As shown, the ultrasonic element includes an ultrasonic transducer 1 and a vibrating body 4. The ultrasonic transducer 1 includes a piezoelectric ceramic sheet 11 and a transducing vibrating body 12 fixedly arranged on the piezoelectric ceramic sheet 11. The vibrating body 4 passes through the connector 2 is fixedly connected with the transducing vibrating body 12, and both the piezoelectric ceramic sheet 11 and the vibrating body 4 have an important influence on the performance of the ultrasonic ele...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects in the prior art that the measurement accuracy of the mechanical quality factor of the vibrating body is low, and the mechanical quality factor of the vibrating body cannot be simultaneously measured under the condition of large amplitude, and provides a simultaneous measurement method that can ensure high measurement accuracy System and method for mechanical quality factor of vibrating body under large amplitude condition

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