Frequency adjustable type ultrasonic amplitude transformer

Abstract

The invention relates to a frequency adjustable type ultrasonic amplitude transformer and belongs to the field of ultrasonic fatigue test. The frequency adjustable type ultrasonic amplitude transformer is capable of solving the problem that the inherent frequency of a displacement amplifier in the ultrasonic fatigue test cannot be adjusted according to the test requirements. According to the technical scheme, a positioning rod is fastened with a fixing base through bolts; an upper end of a frequency up-modulation assembly is fastened with a lower end of an ultrasonic transducer through a bolta; the lower end of the frequency up-modulation assembly is fastened with the upper end of the positioning rod through a bolt b; the upper end of a frequency down-modulation assembly is fastened withthe lower end of the positioning rod through a bolt c; the lower end of the frequency down-modulation assembly is fastened with the upper end of an amplitude-change pole through a bolt d; the lower end of the amplitude-change pole is fastened with the upper end of a test piece through a bolt e; the inherent frequency of the frequency up-modulation assembly and the frequency down-modulation assembly is at 20kHz and is adjustable in a certain bandwidth scope; the axial lengths of the frequency up-modulation assembly, the positioning rod, the frequency down-modulation assembly, the amplitude-change pole and the test piece all are half wave length. The frequency adjustable type ultrasonic amplitude transformer is capable of adjusting the inherent frequency of the frequency up-modulation assembly and the frequency down-modulation assembly and overcoming the defects of the conventional integrated displacement amplifier.

Description

technical field [0001] The invention relates to a frequency-adjustable ultrasonic amplifier used in the field of ultrasonic fatigue testing. Background technique [0002] Ultrasonic fatigue is an accelerated resonance fatigue test method, and its test frequency (20kHz) far exceeds the conventional fatigue test frequency (less than 200Hz). In 1950, Masion established the ultrasonic fatigue test method based on the principle of piezoelectric stretching and using high-energy ultrasonic resonance technology, which opened up a new field of ultrasonic vibration technology in the field of material fatigue damage and cycle life research. The essence of ultrasonic fatigue is to establish mechanical resonance waves on the loaded pattern. [0003] Conventional fatigue tests can only complete 10 6 ~10 7 However, in many industrial sectors (such as high-speed trains, automobiles, aircraft, etc.), the actual service life of some structures and parts often needs to reach 10 cycles. 8 ~...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is: in order to solve the problem that the natural frequency of the displacement amplifier cannot be adjusted according to the test requirements in the ultrasonic fatigue test, a frequency-adjustable ultrasonic amplifier is specially provided

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