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《Journal of Vibration and Shock》 2016-23
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Influenceof load on resonance frequency and resonance impedance of an ultrasonic cutting acoustic system

JI Huawei;YU Wenze;HU Xiaoping;School of Mechanical Engineering,Hangzhou Dianzi University;  
An ultrasonic cutting system may have out of harmony,insufficient amplitude,even non-resonance when bearing a load,these lead to serious effects on machining process and machining quality of a workpiece. Here,the impedance and the resonance frequency of a loaded acoustic system were studied. By using the 4-terminal network method,the input/output characteristics of ultrasonic horn,piezoelectric ceramics and end cover were studied,the whole body design equation of an acoustic system was presented,and the impedance,frequency equation and the relationships among load,current and amplitude of the acoustic system were obtained. In order to get influence laws of load on the impedance and resonant frequency of the system,a digital push-pull meter was used to exert a load in a single direction on the acoustic system,the relationships among impedance,resonant frequency and load were tested. The test results showed that the impedance of the system increases after loads are exerted in three directions; with increase in load,the impedance of the ultrasonic cutting system when loads are exerted in Y and Z directions increases faster than that does when load is exerted in X direction; the increments of resonant frequency of the ultrasonic cutting system when loads exerted in X and Z directions are much more than that be when load is exerted in Y direction; the load in the sensitive direction should be reduced in practical application. The results provided a theoretical guidance for the actual processings.
【Fund】: 国家自然科学基金(51475130);; 国防科工局重大专项(A3920133001);; 浙江省重中之重学科开放基金
【CateGory Index】: TB33;TB559
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