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《Progress in Modern Biomedicine》 2006-01
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The Characteristics of cosine type Loaded ultrasonic horn

LV Hai-tao, ZHU Jie-xi, YANG Yang-ni, YAN Bi-geInstitute of Applied Acoustics, Shaanxi Normal University, Xi'an 710062, Shannxi, ChinaCollege of Life science, Northwest Sci&Tech University of Agriculture andForestry, Yangling 712100, Shannxi, China  
This paper studies a cosine type loaded ultrasonic horn. The unified expressions of amplification factor and mbius transformation parameters of four kinds of loaded transformers are given. If the input reactance part of ultrasonic horn is zero, the resonance frequency equation and magnification coefficient of loaded cosine longitudinal ultrasonic horn will be calculated, including pure resistance and pure reactance and impedance, Based on the expression of mǒbius transformation, the working stability of this type of transformer and equal point of relative impedance etc are further discussed. It shows that resonance frequency equation of loaded cosine horn with two above methods are the same; Its parameters and frequency equation have a close relation with load impedance in relation to zero load horn; In pure resistance condition, magnification coefficient of one-fourth wavelength transformer is more obvious than that of half-wavelength horn, which varies directly with geometric mean value of input impedances of both sides, whereas, varies inversely with pure resistance load.
【Fund】: 国家自然科学基金资助项目(No:10074043);; 陕西省自然科学基金资助项目(No:2003A05)
【CateGory Index】: TB55
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