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《OCEANOLOGIA ET LIMNOLOGIA SINICA》 1999-05
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DESIGN OF A COMPOSITE PIEZOELECTRIC VIBRATOR WITH MULTIDIMENTIONAL COUPLED VIBRATIONS

WANG Qing-chi(Department Oceanography, Xiamen University, Xiamen, 361005)  
If the sizes of the height and the diameter of a composite piezoelectric vibrator arecomparable, then the vibrator can be designed using the method of base frequency apparent elasticitywhen its resonant frequency conforms to the lowest radial resonant frequency equation of thepiezoelectric water and metal disc. When the resonant frequency does not conform to that equation,it can be designed with a quadratic radial resonant frequency by the method of apparent elasticity.After the deduction of the piezoelectric wafer axial apparent elasticity module of quadratic resonancewave, Ez =Ez theoretical curve of the frequency constant (fa) andthe radio of height to radius (h/a) of the composite piezoclectric vibrator can be obtained, incombination with the Iongitudinal vibration frequency equation of the composite piezoclectric vibrator,tg(K1L1/ 2)tg(K2L2/2) = This method has been used in designing the transducers of verticalfish finder and an ultrasonic radiator applied to studies on the enhancement of the content ofmultiple-unsaturated fatty acids in qualified single-celled alga fed with ultrasonic radiahon techniques.The calculation results show that the theoretical value is consistent with experimental data. Themethod is simple, convenient and applicable to the design of the composite piezoelectric vibratorwith multidimensional coupled vibrations, if the radial resonant frequency of the piezoelectric waferis lower than the resonant frequency of the transducer.
【Fund】: 福建省自然科学基金!C97006
【CateGory Index】: TN75
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【Citations】
Chinese Journal Full-text Database 2 Hits
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