Last modified: 2013-05-07
Abstract
Earth-moving machinery drivers are often exposed to whole body vibrations and shock due to terrain irregularities. For the increasing demand of operator comfort, the application of hydraulic mounts for cab’s vibration isolation is of concern. In this paper, effects of the displacement-dependent damping presented by the hydraulic mount with a decoupler on dynamic responses of a frame-cab system under the bump road excitation are investigated. As a result that the cab’s mass center is positioned relatively high above the supporting surface but hardly in the center of the supported mounts, cab shake is prone to generate. Therefore, a 3 degrees-of-freedom model is established, considering the cab vibration along the vertical, roll and pitch axes. The acceleration response of the cab and the rattle space response are compared between with and without the displacement-dependent damping. Simulation results show that the acceleration exhibits a much higher first response peak but decreases rapidly from the adjacent negative peak in the system including nonlinear damping, while the rattle space always has lower response peaks. The study helps to learn the performance of the suspended cab with displacement-dependent damping.
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