A Study on Methods for Measuring Natural Frequency of Rubber Damped Dynamic Vibration Absorber 2019-01-1594
The dynamic stiffness of a rubber damped Dynamic Vibration Absorber (DVA)depends on the excitation amplitude and the excitation frequency. The measured natural frequency of a rubber damped DVA is not a constant and it is decided by external excitations. In this paper, the effects of excitation methods, excitation amplitudes and excitation modes on the measured natural frequency of a rubber damped DVA is studied. Under the different modes of impulse excitations which are generated by a shaker and a force hammer percussion, and the different excitation methods such as constant displacement, constant acceleration and random acceleration, the natural frequency of a rubber damped DVA is measured and compared. It is shown that the natural frequency of the DVA is related to the excitation method, the excitation amplitude and the excitation mode. The larger the amplitude of excitation is, the smaller the natural frequency is. To obtain the accurate natural frequency of a rubber damped DVA, the excitation method, excitation amplitude and excitation mode in the test should be known. It provides the experimental basis for the parameter design of the DVA under actual working conditions.
Liping Li, Qin Wu
South China University of Technology
Noise and Vibration Conference & Exhibition