Composite Materials Broadband Dynamic Vibration Absorber Design And Application

The dynamic vibration absorbing technique has been widely applied in noise and vibration control fields as a easy and effective vibration reduce method. Although dynamic vibration absorber has developed for a long history, it still has good application prospects.A helix-type dynamic vibration absorber has been researched in this dissertation.The control equations of curved beam whose curvature is Archimedes helixes and whose section transforms uniformly have been established with the theory of Timoshenko beam. The equations have been solved with differential cubature method, and inherence frequency and displacement have been obtained. Theoretic basic for more studies have been supplied.The finite element model of helix-type dynamic vibration absorber for elastic plate is established. And effect of dynamic vibration absorber is computed with ANSYS software. The results show that helix-type dynamic vibration absorber has dense modal density and complex mode, and it has wideband vibration absorbing effect. Several parameters effect of the dynamic vibration absorber is also analyzed.Composite materials dynamic vibration absorber is investigated. Its finite element model is established, and computed with parameters of rubber. The results show that composite materials dynamic vibration absorber has better vibration absorbing effect than uniform beam dynamic vibration absorber. Several parameters effect of the composite materials dynamic vibration absorber is also analyzed.The finite element models of flange with uniform beam dynamic vibration absorber and composite materials dynamic vibration absorber have been established respectively. The results show that dynamic vibration absorber has vibration absorbing effect on pipeline. The finite element models of flange with distributed composite materials dynamic vibration absorber is established, and the results show that distributed dynamic vibration absorber has better vibration absorbing effect than single dynamic vibration absorber.The test system is built to test the vibration absorbing ability of composite materials dynamic vibration absorber. The space-time average accelerate response of the plate are tested and average vibration energy of plate with and without dynamic vibration absorber are obtained. In this experiment, electromotor is applied as exciter to simulate reality. The experiment results show that composite materials dynamic...