Use of optimum parameters of a two degree-of-freedom vibration absorber for suppressing the torsional-vibration responses of a uniform beam subjected to an eccentric harmonic dynamic load

• Main Authors: Ho,Chia-Feng, 何嘉峰
• Other Authors: Wu,Jia-Jang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/20070994946354894963

碩士 === 國立高雄海洋科技大學 === 輪機工程研究所 === 98 === In the existing literature, the conventional one degree-of-freedom (dof) vibration absorber is a widely used device for suppressing translational (i.e., vertical or horizontal) structural responses induced by external dynamic loads. For the case of suppressing torsional motions of structures, the relating information is limited. Therefore, this paper presents the optimum parameters for a two-dof vibration absorber such that the torsional-vibration responses of a structure due to external dynamic loads can be effectively suppressed. To this end, equations of motion of the structure together with the two-dof vibration absorber are firstly derived using the Lagrange’s equations. Then, based on the equation for the dynamic magnification factor of the structure, the optimum parameters of the aforementioned vibration absorber are determined. Numerical investigations concerning the use of two-dof vibration absorber for suppressing the torsional-vibration motions of a one-dof spring-mass main system due to a harmonic torque and a uniform beam subjected to an eccentric harmonic dynamic load are conducted. Numerical results reveal that the presented optimum parameters for the two-dof vibration absorber do provide a technique for effectively suppressing the torsional-vibration responses of a structure. Because the presented absorber can also suppress the translational structural responses to some degree, in addition to the torsional-vibration ones, the aforementioned two-dof vibration absorber should be better than the conventional one-dof one.