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Mount is a component used to connect the powertrain and the body, which plays an important role in isolating vibration from motor of electrical vehicles. As for traditional rubber mounts, the dynamic stiffness increases significantly with the increase of excitation frequency and will have a peak value, which is called "internal resonance" phenomenon. Compared with the traditional rubber mount, the rubber mount with second-stage isolators has a smaller dynamic stiffness at high-frequency ranges and is usually used to enhance NVH (Noise, Vibration and Harshness) performance of electric vehicles at high-frequency ranges. This paper investigates a rubber mount with second-stage isolators. The second-stage isolators are assembled with bolt holes connecting with mount and car body.

For traditional rubber isolators, the dynamic stiffness increases significantly with the increase of excitation frequency and will have a peak value, which is called "internal resonance" phenomenon. This paper investigates a double-isolation rubber isolator, which consist of two rubber bushings and additional mass. It can be applied to improve the NVH (Noise, Vibration and Harshness) performance at high frequency of electric vehicles. The equivalent mechanical model and mathematical model of the double-isolation rubber isolator are established. Then, the finite element analysis (FEA) model is established, and we calculate the drive point dynamic stiffness and cross point dynamic stiffness of the inner bushing, outer bushing and the entire double-isolation rubber isolator.