Dynamic And Static Experimental Study On Metal Rubber Vibration Isolator In High-Temperature Environment

Metal Rubber (MR) is a kind of material obtained through special manufacturing technology by pressing wires of stainless steel. The MR vibration isolator is with nonlinear hysteresis characteristics caused by dry friction. This kind of vibration isolator has been widely applied in aerospace, astronautics, shipments, missiles and other fields because of its high and low temperature shock performance, corrosion resistance, ageing resistance, radiation resistance, load capacity, large damping, and adjustable density and porosity. Researchers have made remarkable achievements about the application of MR isolator in normal temperature condition, but few results about the study of MR isolator used in high temperature can be found in the literature. In the present study, the isolation performance of the MR isolator used in a lunar rover working in high temperature, as well as the effects of the structural parameters of MR isolator on its isolation characteristics, is studied, which can be beneficial to the application of MR material in lunar environment theoretically.Based on the analysis of isolation mechanism of MR isolator under random excitation, the formula for the description of RMS acceleration response of MR isolator under the high temperature and random vibration is derived and verified experimentally, and then the scope of application of this formula is determined. This analysis provides a theoretical basis for the design of MR isolator.Based on the swept-sine vibration experiment under high temperature, the dependency of transmissibility on the relative density, preliminary deformation, diameter of metal wire is obtained, and the main influencing factor for the transmissibility under high temperature are analyzed. Based on the random vibration experiment under high temperature, the relationship between the natural frequency, damping ratio, RMS acceleration response and the relative density, preliminary deformation, and diameter of metal wire are obtained, and their influence relationship are analyzed. This study provides experimental evidence for the design of MR isolator.The force-deformation curves of MR isolator are obtained from static experiments under high temperature, from which the hysteresis and damping characteristics of MR isolator are studied, and effects of environmental temperature and relative density of MR components on the coefficient of energy dissipation and average stiffness are analyzed, which provides a reliable evidence for the design of isolators.