| Summary: | 碩士 === 國立高雄海洋科技大學 === 輪機工程研究所 === 100 === In the field of structural engineering, the engineers usually use the translational one degree-of-freedom vibration absorber for suppressing the translational (vertical or horizontal) structural responses induced by external dynamic loads. Therefore, the relevant information in this aspect is abundant. Nevertheless, the literature concerning the device for suppressing both the torsional and bending structural responses is limited. Thus, the object of this research is to present a theory for the rotational vibration absorber, so that the structural engineers can use it for effectively suppressing both the torsional and bending vibration responses of a structure due to eccentric distributed harmonic forces. To the last end, by means of the Lagrange’s equations, the equations of motion for a rotational vibration absorber and the generalized main vibration system corresponding to a certain predominant mode shape of the beam will be firstly derived. Then, the optimum parameters of the rotational vibration absorber will be determined by means of the mathematical expressions for the dynamic magnification factor of the torsional and bending dof’s of the last generalized main vibration system. Numerical investigations concerning use of rotational vibration absorber for suppressing the vibration responses of the generalized main vibration system due to a harmonic torque will then be conducted. Finally, based on the theory of mode superposition, the presented technique will be extended to suppressing both the torsional and bending vibration responses of a beam undergoing eccentric distributed harmonic forces. Because the presented rotational vibration absorber can suppress the torsional and bending vibration responses of a structure simultaneously, the last vibration absorber should be significant from the viewpoint of practical application.
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