Automotive Silicone Oil Shock Absorber Damping Performance Parameters Of The Calculation Method Of Research

Torsional vibration is one of the most important factors which greatly influence the mobile safety. Torsional vibration will not only crease the subsidiary stress on the crank shaft and negative effects on corollary equipment, but also create obvious vehicle vibration and noise, these will reduce the vehicle ride comfort. The most commonly used method to reduce the torsional vibration is adding silicone oil damper which parameters are suitable with the engine. During the matching procedure, the exactly number of stiffness, inertia and damp should be known. The inertia parameter of the silicone oil damper is easy to get, but the damp parameter is hard to know. In this paper, a mathematical method is proposed to calculate the inside damp parameter of silicone oil damper according its structure. The method calculates the damper parameter from the phase difference between the damper shell and inside inertia ring. The inertia, stiffness, modal parameters during the compute process is got by finite element method. The test experiments including the silicone oil damper confirm the feasibility of this method and the credibility of the results. According the testing damper number and the inherent property of the testing equipment, the sensitivity of the torsional vibration amplitude was analyzed under the changing of silicone oil damper parameters.The following works are completed in this thesis:1. Put forward the calculate procedure according the phase difference between the damper shell and inside inertia ring, set up the mathematic expression according the Alembert equation, choose the phase difference under ideal state, calculate the damper number in different frequency, build the damp, frequency, phase difference MAP.2. Build the silicone oil damp parameter test bench, use finite element software such as pro/e, hypermesh, abaqus to simulate the mechanical components, get the property of inertia, stiffness and modal parameters.3. Write the control application program based on Labview and write the damp parameter calculate program based on matlab. 4. Do the experiment with silicone oil damper, find out the phase difference and the real damp number using the already got MAP.5. Use two method to certify the calculate results. The first one calculates the external applied moment according to the calculated damp number; the second one calculates the ideal torsional amplitude according to the calculated damp number. Take these two calculate test to compare with the ideal results, prove the validity of the calculate method.6. On account of two variable parameters:the inertia of the inner ring and the inside damp of the silicone oil damper, calculate the properties of the test system with the changing variable parameters; match the test bench and the silicone oil damper with mathematical method.