A test method of dynamic damping coefficient of micro-vibration isolators

The determination of the damping coefficient is very important for vibration isolation design. For large damping viscous fluid micro-vibration isolators, this paper presents a new equivalence theory and method to measure the damping coefficient of a three-parameter isolation model. Based on the equality of mechanical impedance, an equivalent two-parameter physical system which can be easily tested is obtained from the three-parameter isolation model. The measured damping coefficient and stiffness coefficient from a self-designed test setup are input into an ADAMS simulation model, and then the equivalent damping coefficient of this simulation is compared with that directly received from a hysteretic loop test. The results show great consistency between simulation and measurement and thus prove the validity and feasibility of this method. The variation of dynamic damping coefficient with frequency is also obtained, which is difficult for traditional methods to obtain and will be valuable for the design of vibration isolation. Thus, it becomes convenient to conduct measurements of damping coefficients of micro-vibration isolators because of the simplified model. Furthermore, the method can also be applied to isolators with more parameters to measure damping coefficients.