Study On The Damping Performance Of ZN-35 Silicon Rubber Damper

With the rapid development of launch vehicles,satellites,missiles and other equipment,rubber shock absorber as the protection elements plays a very important role.At present,the design of rubber shock absorber depends on experience and repeated test verification,which leads to long design cycle and large design investment.These problems mainly come from the lack of in-depth understanding and flexible application of the damping performance parameters of rubber materials.In this paper,through the vibration test of zn-35 silicone rubber damper,the factors influencing the damping performance of the rubber damper are studied,and the dynamic performance of the rubber damper are explored,which provides the data support for the realization of the theoretical design of the rubber damper system.First of all,according to the damping model of the original vibration system in the laboratory,and the material property and working state of the ZN-35 silicon rubber damper,the mathematical model and analysis of its completion degree are made.It is determined that its stiffness and damping coefficient are the important factors affecting the damping system.The least square method and frequency domain analytical method are proposed to identify the parameters of the ZN-35 silicon rubber damper.The accuracy of these two methods is verified by numerical simulation,and the conclusion that the two methods can identify the parameters of the damper accurately is obtained.The influence of the integral method of the vibration signal on the identification accuracy are analyzed,and the result shows that the vibration signal can be identified after the frequency domain integral processing parameters work best.The vibration test is carried out to simulate the working state of the ZN-35 silicon rubber damper.The identification test data shows that the stress area of the rubber damper has a great influence on its parameters,that is,the shape has great influence on the damping effect.The relationship between the parameters of the damper and the material modulus is established by the ANSYS analysis software,which eliminates the interference of the shape of the rubber damper on the parameter research.The single degree of freedom vibration test of 20Hz-2000 Hz under the ideal state of ZN-35 silicone rubber damper is realized by improving the test device.The change data of stiffness and damping coefficient in the wide frequency range of ZN-35 silicone rubber damper are obtained,and the correctness of the identification result is verified by the method of hysteresis loop.The results show that the stiffness curve of shock absorber increases slowly in the range of 20Hz-1000 Hz,and is stable in the range of 1000Hz-2000 Hz,the damping coefficient curve decreases in the range of 20Hz-1000Hz,and is stable in the range of 1000Hz-2000Hz.The relationship between the pressure on the shock absorber and its compression is quantified,and the influence of the preload on the parameters of the shock absorber is studied.It is found that the change of the parameters of the shock absorber is not affected by the frequency,and the curve of the change rate of the parameters with the change of the preload is drawn.The influence of excitation frequency and preload on energy consumption of ZN-35 silicon rubber damper is analyzed.The conclusion is the higher the excitation frequency is,the smaller the energy consumption per unit cycle of the damping system will be.When the excitation frequency reaches a certain range,the greater the energy consumption per unit period will be with the increase of the excitation frequency.The greater the preload is applied to the damper,the smaller the energy consumption per unit cycle will be;the preload will change the resonance area of the damping system,that is to say,if the preload of the damper is applied properly,the rubber can be adjusted The resonance area of the damper's pressure regulating system.