System and method for measuring mechanical quality factor of vibrating body

Abstract

The invention belongs to the technical field of mechanical quality factor measurement, and particularly relates to a method and system for measuring the mechanical quality factor of a vibrating body.The method comprises the steps of driving an ultrasonic transducer by a detection signal wave to excite the vibration of the vibrating body, moving a vibration measuring device along the axial direction of the vibrating body, and measuring the vibration speeds and phases of a plurality of mass points at intervals of delta Z infinitesimal elements on the surface of the vibrating body; carrying outspatial Fourier transform on the vibration speed of the measurement mass points on the vibration body to obtain a frequency spectrum in a wave number space, determining a main wave number k0, removinga wave number above 1.2 k0, restoring a distribution curve of the vibration speed of the mass point in the space, calculating the energy loss delta Ed of the infinitesimal element and the reactive energy delta Er of the infinitesimal element, and obtaining the corresponding relation between the mechanical quality factor of the vibrating body and the amplitude of the vibrating body. According to the present invention, the influence of the energy loss of the connector on the measurement result is avoided in principle, the measurement precision is ensured, the whole calculation process is simpleby using a method of firstly analyzing the infinitesimal and then analyzing the whole through the infinitesimal, and the large-scale application can be carried out.

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. like 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 elemen...

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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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