Frequency domain analysis of linear and nonlinear structures with applications to impact force identification and micro-resonator design

[摘要] The modeling and analysis of structures using frequency-domain methods simplifythe procedure of the modeling and analysis and provides better understanding ofthe response of the structures. There are different applications in frequency-domainstructural modeling and analysis such as modeling and analysis in impact engineering,wave propagation in structures, and micro-resonators. The identification of theimpact force and the impact location in structures are important for monitoring thecondition of the structures and also for the design of the future structures. The complexityand nonlinearity of the impact incident makes it impractical to measure theimpact force directly. In this study, a new method that uses the spectral finite elementmethod (SFEM) is introduced in order to identify and locate the applied impactforce. Using SFEM facilitates for the successfully identification of the high frequencycontent in the impact forces. Also, using SFEM allows for the identification of theimpact force independent of the location of the impact force. The impact force identificationand localization method is verified by experimental results. For designingand analyzing micro-resonators, it is required to do the frequency-analysis of thesestructures which provide the frequency characteristics and the frequency-response ofthe structures. In this study, a novel class of parametrically excited micro-resonatorsis introduced. The micro-resonator takes advantage of piezo-electric excitation whichimproves the performance of the micro-resonator over that of the micro-resonatorswith electrostatic excitation for certain applications.

[发布机构] Rice University

[效力级别] force