Because of the density mismatch between the decoupler and surrounding fluid, the decoupler of all hydraulic engine mounts\r\n(HEM) might float, sink, or stick to the cage bounds, assuming static conditions. The problem appears in the transient response of\r\na bottomed-up floating decoupler hydraulic engine mount. To overcome the bottomed-up problem, a suspended decoupler design\r\nfor improved decoupler control is introduced. The new design does not noticeably affect the mechanism�s steady-state behavior,\r\nbut improves start-up and transient response. Additionally, the decoupler mechanism is incorporated into a smaller, lighter, yet\r\nmore tunable and hence more effective hydraulic mount design. The steady-state response of a dimensionless model of the mount\r\nis examined utilizing the averaging perturbation method applied to a set of second-order nonlinear ordinary differential equations.\r\nIt is shown that the frequency responses of the floating and suspended decoupled designs are similar and functional. To have a more\r\nrealistic modeling, utilizing nonlinear finite elements in conjunction with a lumped parameter modeling approach, we evaluate\r\nthe nonlinear resorting characteristics of the components and implement them in the equations of motion.
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