Study on metal rubber material's characteristics of damping and sound absorption

Metal Rubber (MR) is a kind of new-style porous damping material. It is made of wires through choiceness, encircling, wiredrawing, weaving and molding by compression. The special production techniques make its characteristics incomparable, such as high damping, controllable porosity and strong environmental adaptability, besides it is easy to be fabricated into complex shapes. Thus MR can be widely used in many aspects such as damping, sound absorption, seal and thermal protection. The damping and sound-absorbing characteristics of MR material are studied in theory and experiment in the paper, and the applications of MR products are introduced. This paper first presents the characteristics of MR's stiffness and damping, and the energy dissipating model is used to describe the relative dry friction process of wires. Through static and dynamic experiments, the influencing laws of production techniques and structural parameters on the performance of MR are studied, and the design parameters' range of different dampers is obtained. The research on the principle of porous acoustic absorption materials is performed. Through measuring the absorption coefficient and acoustic impedance of MR with different structural parameters, the influencing laws of porosity, thickness, cavity size and other factors on sound-absorbing characteristics of MR are obtained.