Vibration Reduction of an Annular Rotating Plate with Constrained Layer Damping Treatment

• Main Author: 于善淳
• Other Authors: 黃世欽
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/98169505048096616052

博士 === 國立臺灣科技大學 === 機械工程系 === 90 === In this dissertation, vibration suppression of a three-layer circular plate with a viscoelastic core is studied. First of all, based on Love''s thin shell theory and by referring to the theory of Mead and Markus, the equations of motion for a three-layer rotating shell with a constrained layer damping (CLD) are derived via energy principles. The derived equations can be applied to structures of various geometries commonly encountered in engineering applications, for example, cylindrical shells, circular rings, circular plates, etc.. The response of the transverse displacement subjected to transverse loading is the focus of this study. By adopting Donnell-Mushtari-Vlasov''s assumption, the equations are simplified to contain only three displacement variables of the main structure. One is the transverse displacement and the other two are the in-plane displacements. Since the applications of the circular plates in engineering are extensive, this has a comprehensive study on the contribution of the CLD on the vibration suppression of the circular plate, which includes both static and rotating systems. At last, the response equation of the plate can be simplified to be expressed in terms of the transverse displacement and contains n linear single degree of freedom systems with hysteretic damping. The discussion begins with the contribution of viscoelastic core on the vibration suppression of a circular plate. Then, the damping effects caused by the CLD and the viscous damper on a spring-mass-damping (SMD) and plate system are compared. At last, the CLD applied to a rotating system is investigated. The results provide comprehensive explanation on vibration suppression of a circular plate with passive constrained layer damping (PCLD) and can be used as references for engineering designs.