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TECHNICAL PAPERS

Simulation of Engine Vibration on Nonlinear Hydraulic Engine Mounts

[+] Author and Article Information
A. R. Ohadi

Mechanical Engineering Department,  Amirkabir University of Technology, Hafez Avenue, Tehran 15914, Irana̱ṟohadi@aut.ac.ir

G. Maghsoodi

Automotive Engineering Department,  Iran University of Science and Technology, Tehran 16844, Iran

J. Vib. Acoust 129(4), 417-424 (Apr 09, 2007) (8 pages) doi:10.1115/1.2748459 History: Received August 19, 2005; Revised April 09, 2007

In this paper, vibration behavior of engine on the nonlinear hydraulic engine mount, including inertia track and decoupler, is studied. In this regard, after introducing the nonlinear factors of this mount (i.e., inertia and decoupler resistances in turbulent region), the vibration governing equations of engine on one hydraulic engine mount are solved and the effect of nonlinearity is investigated. In order to have a comparison between the rubber and the hydraulic engine mounts, a six-degree-of-freedom four-cylinder V-shaped engine under shaking and balancing mass forces and torques is considered. By solving the time domain nonlinear equations of motion of the engine on three inclined mounts, translational and rotational motions of an engine body are obtained for different engine speeds. Transmitted base forces are also determined for both types of engine mount. Comparison of rubber and hydraulic mounts indicates the efficiency of a hydraulic one in the low-frequency region.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross section of hydraulic engine mount including inertia track and decoupler (6)

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Figure 2

Lumped parameter model of hydraulic engine mount (6)

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Figure 3

Schematic of inertia track and decoupler (7)

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Figure 4

Rigid-body engine model

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Figure 5

Inclined mounting system

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Figure 6

Single-cylinder engine model

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Figure 7

Direction of cylinders of four-cylinder V-shaped engine in global coordinate system (8)

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Figure 8

Variation of dynamic stiffness of HEM versus frequency: (a) Low-amplitude excitation (X=0.05mm) and (b) high-amplitude excitation (X=1.0mm)

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Figure 9

Variation of volumetric flow through (a) inertia track and (b) decoupler versus time for nonlinear model under low-frequency (6Hz), high-amplitude excitation (1mm)

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Figure 10

Variation of volumetric flow through (a) inertia track and (b) decoupler versus time for nonlinear model under high-frequency (50Hz), low-amplitude excitation (0.05mm)

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Figure 11

Time domain responses of engine at 800rpm speed. (a) Engine displacement in X (bounce) direction, hydraulic mounts; (b) engine displacement in X (bounce) direction, rubber mounts; (c) transmitted force to base, hydraulic mounts; and (d) transmitted force to base, rubber mounts.

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Figure 12

Responses of engine versus frequency. (a) Engine displacement in X direction, (b) engine displacement in Z direction, (c) engine rotation in Y direction, and (d) transmitted force to base.

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