Inertial piezoelectric exciting device and implementation method

Abstract

The invention relates to an inertial piezoelectric exciting device and an implementation method; wherein, the device comprises a piezoelectric ceramics stack, inertia quality, a base, a piezoelectric force transducer, a preloaded spring, a preloaded nut, a preloaded bolt, an insulated sleeve and the like; the piezoelectric ceramics stack is arranged between the inertia quality and the base; the preloaded bolt and the preloaded spring compress own joint surfaces; outgoing lines of the positive and negative electrodes of the piezoelectric ceramics stack are respectively connected with the positive and negative output terminals of an external driving circuit; the insulated sleeve is arranged between the preloaded bolt and the inner wall of the piezoelectric ceramics stack; the base is closely connected with the piezoelectric force transducer by the bolt. In the invention, the way that a fixed bolt is directly fixed on an excited structure is adopted, exciting force is generated onto the structure by telescopic motion of the piezoelectric ceramics stack, the piezoelectric force transducer measures and monitors the output force and the upper frequency limit of the provided exciting force can exceed 20KHz. The device has the advantages of small volume, simple structure, convenient installation, high upper frequency limit and the like, and can work in the manners of sine, sine sweeping exciting and shock exciting.

Description

technical field [0001] The invention relates to an inertial piezoelectric excitation device and a realization method, which can be used for vibration excitation in a high frequency range in structural dynamic tests. Background technique [0002] As one of the smart materials, piezoelectric ceramics have been widely used in sensing and driving because of their bidirectional mechanical energy and electrical energy conversion capabilities. They have the advantages of fast frequency response, large driving force, and low heat generation. The field has become one of the important drivers, and has a variety of working methods, including direct drive, inertial impact, creep displacement, etc. In terms of inertial drive, it can be generated by applying symmetrical or asymmetrical waveforms through its dynamic expansion and contraction. It is also an important application component in the ultrasonic field. Ultrasonic transducers are widely used in many engineering aspects such as ult...

AI Technical Summary

Problems solved by technology

[0003] The vibrator is currently an indispensable test equipment in the dynamic test analysis of mechanical structures. The traditional vibrator is mainly an electric vibrator. Because it is limited by the natural frequency of the driving coil and the skeleton, there is a problem of low upper frequency. Disadvantages, because there are excitation elements and drive coils in the structure, there are electromagnetic interference and magnetic flux leakage effects, and usually have a heavy fixed base, which has problems such as heavy weight and inconvenient installation

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