682 - Modal detection for non-uniform beams using continuous and discrete strain sensors
Anthony D.
Abstract
Surface mounted strain based sensors provide a more practical and cost effective solution for measuring plate vibration for in-field applications such as Active Structural Acoustic Control (ASAC). When considering non-uniform plates the orthogonality condition (OC) based on the plate kinetic energy cannot be used, and an approximate strain energy based OC has been developed for beams using with continuous strain sensors, such as polyvinylidene fluoride (PVDF) [3]. The OC is converted for use with discrete sensors and compared with the Least Mean Squares method (LMS) method. It is found that using the OC as a basis for modal detection is not successful for strain sensing and the LMS method is better but still not as good as when using displacement detection. The consequence of using strain sensing in general is discussed, and also the more detrimental aliasing effect for discrete sensors when applied to non-uniform beams.
Citation
Anthony D.: Modal detection for non-uniform beams using continuous and discrete strain sensors , CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7
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