Vibration And Shock Experiments Research Of Elastomer Damper Dynamics Modeling Analysis

Dampers are the essential equipments for reducing the shock. Bridges, vehicles, aircrafts and military equipments all need dampers to protect themselves from damage. Concerning the status that the dampers can not satisfy the demand of reducing the vibration and shock at the same time, we provide a new method of using the coupling of the solid particles and fluid to reduce the vibration and shock, research on the improvement of the damping characteristics by adding solid particles has important theoretical meaning.The research is financially supported by National Natural Science Foundation (No.10872132). Combining the experiments and theories, we conducted the vibration and shock experiments, and built the dynamics models and identified the parameters for each experiment. The details of this research are as follow:(1) Out of the demand of the experiments, double-acting damper with gap was designed and different volume percentages of solid particles were added into the cylinder of the damper for the incoming experiments. In the vibration experiments of the elastomer damper, we analyzed the components of the experimental signal in order to choose the appropriate filters to get the real damping force singal. Then we studied the influence of the damping force– displacement hysteresis curves under different volumes of particles and different amplitude and frequency of the displacement.(2) During the shock experiments, we measured the shock results of different dampers at different shock heights and analyzed the damping performance of the testing dampers, which contained pure silicone oil or silicone oil with different volume percentages of particles in it. In the analysis, we emphasized on the curves of acceleration-time, damping force-velocity and damping force-displacement of the dampers.(3) In the modeling of the vibration, we built the Bouc-Wen hysteresis model. Meanwhile, we utilized the un-sensitiveness of some parameters of Bouc-Wen model to transfer the non-linear parameter identification problem into linear parameter identification problem, so the process of the calculation for the identification will be reasonably simplified. Moreover, concerning the character of hysteresis curve of the elastomer damper and the weakness of Bouc-Wen model, we added a velocity dampering term into the former model in order to make the identification results represent the real curve of dampers more accurately.In the modeling of the shock, we utilized the non-newton fluid character of the silicone oil to build the mathematical velocity related model and indentify the parameters by linearization of the equation, and successfully get the damping force equations for each damper.These works have theoretically significant guidance and reference to research on the shock and vibration characteristics of the elastomer dampers under coupling, dynamics modeling and parameter identification of the dampers.