Influences of non-ideal factors on a high frequency sine pressure generator
XUE Bin1 , YANG Jun1,2 , LI Bo1
1.Key Lab, Changcheng Research Institute of Metrology & Measurement, Beijing 100095, China;
2.School of Instruments and Optoelectronic Engineering, Beijing University of Aeronautics &Astronautics, Beijing 100191, China
Abstract：A piezoelectric transducer installed at bottom of a high frequency sine pressure generator was taken as the generator’s excitation source, and its resonant cavity affects distributions of resonant points and pressure amplitude.During the actual installation, there are some non-ideal factors due to engineering reasons including gaps at tube cavity connection positions, water medium not enough to fill tube cavity, air layer and uneven surface of piezoelectric transducer.Based on the software COMSOL simulation platform, taking the form of multi-physical field coupled simulation, the error between resonant frequency under the case of acoustic-structure coupling and theoretical calculation was analyzed, and simulation studies were conducted for non-ideal factors mentioned above.The simulation results showed that installation gaps cause pressure amplitude to drop, and air gaps in tube cavity causes resonant points’ amplitudes to drop and affects low-frequency amplitude seriously; uneven surface of piezoelectric transducer in installation process causes resonant frequency to offset, the larger the inclination angle, the more serious the offset; comparing the simulation results with the test ones, both of them have basically consistent laws..
薛斌 1,杨军 1，2,李博 1. 高频正弦压力发生装置的非理想因素影响分析[J]. 振动与冲击, 2019, 38(3): 179-185.
XUE Bin1,YANG Jun1,2,LI Bo1. Influences of non-ideal factors on a high frequency sine pressure generator. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(3): 179-185.
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