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标题：CALCULATION OF ACTIVE ELEMENT UNDER THE FORM OF PIEZOCERAMIC DISK OF AN ULTRASONIC ENGINE WITH THREE FREEDOM DEGREES
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作者：Dan DOBROTĂ ; Oana CHIVU
期刊名称：Constantin Brancusi University's Annals, Letters and Social Sciences Serie
印刷版ISSN：1844-6051
出版年度：2009
期号：3
出版社：Academica Brancusi Publisher
摘要：Waves propagation in various media and in certain conditions is a widely discussed problem by many authors, in various ways, based on the same main equations. The difference between various approach methods discussed in this paper is the actual applicability degree in practical circumstances and the way in which these theories adjust easier to practical requirements for solving various problems. We next describe only the propagation of Raileigh waves in active elements like piezoceramic disks. The study is limited to the analysis of small amplitude free vibrations in a semi-finite environment resulting as a particularization of propagation in infinite media. We shall consider first the study referring to vibrations propagation without referring to the reflexion, refraction of waves or their combinations.
关键词：ultrasonic; piezoceramic; freedom ;degrees