ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
FEM is a very important tool for getting the numerical solution of many engineeringproblems. It has been widely used in solving structural, mechanical, heat transfer, and fluiddynamics’ problems as well as problems of other disciplines such as piezoelectricity. Since thecomplexity of many problems leads to the formation of models of large dimension, which aredescribed with many degrees of freedom, their numeric solution makes for the highest demands.The number of degrees of freedom is often unnecessarily large to represent the structural responsein a limited bandwidth and therefore, in such a case, a reduction should be conducted. Thesystematic reduction of complex FE models on simple electromechanical equivalent circuit models(with less mechanical degrees of freedom) is the subject of this paper. The aim of the work is tomake the reduction in such a way that the characteristics of the systems input/output descriptionsare approximated within a pre-selectable frequency range with sufficient accuracy. A transducerwedge-system is used as an example for the method, to extract a state space model of the systemspiezoelectric input/output description and to derive the parameters of the electromechanicalequivalent circuit directly from the modal finite element analysis. In the present paper we describethe general methodology as well as its application to piezoelectric transducers as used in ultrasonicengineering
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.113.1.pdf
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