| This subject stemmed from the promotion project of Shanxi Intellectual Property Office(SIPO) —— Application of the Viscoelastic Damper, and the project of China Coal Technology & Engineering Group(CCTEG) Taiyuan Research Institute —— Research on Technique for Reducing Vibration and Noise of the Engine in Explosion-proof Vehicles. Aimed at solving problems for designing damper elements, this paper took WC5 E explosion-proof vehicle as the research project, mainly carried out the following:Based on WC5 E explosion-proof vehicle, research was done on damper elements in non-road vehicles such as explosion-proof vehicles, the hardness of damper is about 60(shore A), and with it, the engine’s damper was redesigned in aspect of basic parameters and structures.A 6DOF vibration model of the engine was established, and vibration coupling analysis was done for the engine’s damping suspension system, showing that the decoupling performance is not good and damper parameters need to be optimized. For maximizing decoupling performance, this paper set distribution range of the system inherent frequency in terms of preventing resonance and the stiffness range of dampers as constrain, after optimization, the distribution range of the system inherent frequency was more reasonable and the decoupling performance was also improved.In order to testify the feasibility of the optimization, an experiment was carried out to compare the original vehicle with the optimized one. The result showed that the self-excited kinetic energy transferring to the frame declined compared with the original vehicle. RMS of vertical vibration in the driver seat also decreased, these improvements showed a better driving experience.The redesigned engine damping system of WC5 E explosion-proof vehicle, which successfully improved the isolation performance and driving experience, has received acceptance of CCTEG Taiyuan Research Institute and applied on this type of vehicle already. |
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