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It can be seen that if the natural frequency of the vibration isolation system is reduced, the damping ratio is increased, the vibration isolation frequency range is widened, and the transmission rate is lowered, this is exactly what we need. The vibration isolation system improves the simulation results of the transmission rate before and after. The test results and analysis are summarized. The following improvements are proposed for the compression spring isolation system: (1) reduce the natural frequency of the vibration isolation system, reduce the transmission of the vibration of the movement to the outer casing, and reduce the vibration of the casing; (2) increase the separation Damping of the vibration system to improve the vibration isolation effect of high-frequency vibration and reduce the high-frequency vibration of the casing, thereby reducing the noise of the compressor. After the improvement according to the scheme, the vibration and noise test of the compressor is performed according to the normal process installation.
The test results show that the vibration of the compressor of the compression spring isolation system has been significantly reduced compared with the current compression spring isolation system. For some measuring points, the reduction is more than 50%. This proves that reducing the stiffness of the compression spring and appropriately increasing the damping of the vibration isolation system, etc. Measures are very effective in reducing the vibration of the compressor.
(3) The electrorheological fluid is converted from a liquid to a solid-like solid, and a moving plate group of the damper is also accompanied by a part of the electrorheological fluid to participate in the movement. Although the viscosity coefficient C1 also varies with the applied voltage, the variation is not large.
(4) At low electric field strength, the electrorheological fluid is still in a liquid state, and the viscous damping in the damping characteristic is dominant; the electric field strength increases as the applied voltage increases, and the electrorheological fluid gradually changes from a liquid state to a solid-like state, Coulomb The damping effect is significantly increased, and the viscous damping characteristic changes little at this time. It can be seen that the damping controllable part of the ER damper is actually its Coulomb damping force.
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