Mathematical Modeling of Passive Hydraulic Engine Mounts

Abstract

Hydraulic engine mounts are widely used in automotive powertrain for vibration isolation. A lumped mechanical parameter model is a traditional approach for modeling and simulation of such mounts. This paper presents a mathematical model of passive hydraulic engine mounts with a double-chamber, an inertia track, a decoupler, and a plunger. The model is developed based on analogy between electrical systems and mechanical-hydraulic systems. The model is created to capture both the low and high frequency dynamic behavior of hydraulic mounts. The model will be further used to find the approximate pulse responses of the mounts in terms of the force transmission and top chamber pressure. The close form solution from the simplified linear model may provide some insight into the highly nonlinear behavior of the mounts. Various operational scenarios are also discussed.