Papers by Keyword: Metal Rubber

Abstract: The damaging variable was defined firstly, mean while the fatigue character of metal rubber was discussed. Then the relationship between damaging variable and cyclic loading times had been summarized through fatigue tests. Finally observed the pattern of fracture face, cavities and flaws of the fatigue wires inner the metal rubber components with electronic scanning microscope, some technical methods of improving the wearing resistivity of metal rubber material had been brought forward.

Abstract: The damaging factor was defined firstly, mean while the fatigue character of metal rubber was discussed. Then the relationship between damaging factor and cyclic loading times had been summarized through fatigue tests. Finally observed the pattern of fracture face, cavities and flaws of the fatigue wires inner the metal rubber components with electronic scanning microscope, some technical methods of improving the wearing resistivity of metal rubber material had been brought forward.

Abstract: In order to reduce the vibration load transmitted from the launch vehicle to the spacecraft during the launching stage, a whole-spacecraft vibration isolating method is advanced by modifying ordinary payload attach fitting (PAF). The core component of the PAF is a kind of damping rod produced by composite material encapsulating metal rubber (MR). In this paper, nonlinear equivalent damping model of the damping rod is built up. By using the model, the stiffness, damping and the transmissibility of the damping rod is studied attentively. Simulation results demonstrate that there exist nonlinear relationships between vibration parameters and the stiffness and damping characteristics of the damping rod. The damping rod can isolate high-frequency vibration as well as restrain the resonant peak effectively.

Abstract: Metal Rubber is a kind of material with nonlinear of resuming force. In the dynamic test of Metal Rubber based on the control of displacement loading, its force-displacement curve is a hysteretic loop. The hysteretic phenomenon is studied with the means theory and experiment in this paper. The generalized restoring force is the binary function of displacement and speed. For the binary function, it is unilateral to represent the hysteretic loop only on the displacement-force plane, so the space hysteretic loop is introduced. The important parameters of the linear vibration isolators are stiffness and damping coefficient, however the nonlinear vibration isolators have stiffness and damping function, which all need be identified from the tested data. The results have proved that the dynamic model can meet the requirements of dynamic analysis of Metal Rubber in engineering.

Abstract: The hysteresis dynamic behavior of metal rubber mathematically modeled with a practical method is studied, and the method of parameter separated identification is presented with details. Parameters of the model are identified with the test data of metal rubber, from which the theoretical loops are reconstructed, and the mechanism of the nonlinear damping behavior of the metal rubber is investigated. The theoretical loops and the experimental one are close to each other with satisfactory accuracy. The result shows that with the simple mathematical form and the satisfactory precision, the mixed damping model can be used effectively in practical engineering. This study provides a practical and effective method in modeling and the parameter identification of the metal rubber isolator.

Abstract: This work studied the cushion efficiencies of aluminum foam and metal rubber as the cushion materials for microaccelerometers under shock load. A series of shock experiments were carried out to test the performance of these two materials. Preliminary results indicated that aluminum foam and metal rubber have different energy absorption mechanisms, and both of them have excellent energy absorption capability, which can effectively cushion the effect of shocking pulse peak and suppress the high-frequency vibration noise. Aluminum foam and metal rubber are believed to be promising cushion materials for microaccelerometer.

Abstract: Based on the basic components of the porous Metal Rubber (MR) materials, all kinds of heat transfer modes were analyzed. Wire helix was considered as the micro-element of Metal Rubber by analyzing the characteristics of processing components of Metal Rubber. According to the acoustoelectric analogy method, the heat transfer model of MR was established on the basis of arrangement of wire helix and Fourier Law. The formula of thermal conductivity coefficient was derived. And the LFA 427 instrument was used to obtain thermal conductivity characteristics of MR experimentally. The results showed that the model had certain application. This model was valuable for the analysis of the thermal properties and the design of Metal Rubber. It provided theoretical support for the further engineering application of Metal Rubber in the field of heat insulation.

Abstract: In this paper, the main problem is how to eliminate vibration came from the compressor base in petrochemical industry. The absolute transmissibility was calculated by building the compressor isolation system model. The spectrum information of compressor vibration was got through the vibration test, and the results can be acted as the condition for the isolator’s design. Isolators were designed with damping part connecting metal rubber with helical spring. Nonlinear simulation calculation was completed by finite element software. The results show that the maximum stress of isolator is about 494MPa and its maximum distortion is approximately 6mm. It verifies that the new-style isolator can satisfy vibration elimination of compressor. It is with wide-range rigidity and better capability of energy dissipation than that of general rubber isolator. It has a useful application and perspective on vibration elimination for the mechanical equipment in petrochemical industry.

Abstract: The metal rubber is a kind of material for vibration control. In this paper, experimental research on characteristics of energy dissipation of metal rubber is exploited, and the relation between metal rubber stiffness and the amplitude of relative density and load. The relative between relative density and characteristics of energy dissipation is researched, in the excitation of displacement and load respectively. By comparing variation of the deformation and load with time, we found that the cycle of deformation and load is the same, but the deformation is still lag behind load. The research provided a basis for the application of metal rubber.

Abstract: This paper introduces a sound absorption structure named as MPA/MR which is a combination of the MPA and Metal Rubber (MR) material. On the basis of Rayleigh model and sound propagation theory in pipe, according to the acoustoelectric analogy method, the theoretical acoustic model of MPA/MR is established, and the formula of absorption coefficient is derived. The multi-function standing wave tube with two microphones was used to obtain acoustic characteristics of MPA/MR experimentally, and the effects of the parameters were analyzed as well. The investigation indicates that MPA/MR can be applied with a broad range of application prospects.