Modal disparity and its experimental verification
This paper describes an analytical and experimental investigation of the property of modal disparity in a vibrating structure. For a given structure, the concept of modal disparity describes the structure's ability to generate significant changes in the mode shapes by some type of on-the-fly st...
محفوظ في:
| المؤلف الرئيسي: | |
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| التنسيق: | article |
| منشور في: |
2008
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| الوصول للمادة أونلاين: | http://hdl.handle.net/10725/3959 http://dx.doi.org/10.1016/j.jsv.2007.10.038 http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php http://www.sciencedirect.com/science/article/pii/S0022460X07008280 |
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| الملخص: | This paper describes an analytical and experimental investigation of the property of modal disparity in a vibrating structure. For a given structure, the concept of modal disparity describes the structure's ability to generate significant changes in the mode shapes by some type of on-the-fly structural modification. In the present study we consider a vibrating beam that experiences a controlled stiffness change, induced by the activation and deactivation of an electromagnetic brake that causes a spatially localized change in the bending stiffness. Using a finite element model and an experimental apparatus it is shown that significant amounts of energy can be shifted back and forth between sets of modes in a systematic and predictable manner. This confirmation of modal disparity for a specific structural system provides evidence that this concept is feasible, and thereby opens the door for a number of potential applications in passive and active control of vibrating structures. |
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