Research Papers

Development of an Active Compliance Chamber to Enhance the Performance of Hydraulic Bushings

[+] Author and Article Information
S. Arzanpour

 Simon Fraser University, Surrey, BC, V3T 0A3, CanadaSiamak_arzanpour@sfu.ca

M. F. Golnaraghi

Department of Mechatronic Systems Engineering, Burnaby Mountain Chair, School of Engineering Science, Simon Fraser University, Surrey, BC, V3T 0A3, Canadamfgolnar@sfu.ca

J. Vib. Acoust 132(4), 041012 (Jul 15, 2010) (7 pages) doi:10.1115/1.4001500 History: Received April 11, 2009; Revised March 23, 2010; Published July 15, 2010; Online July 15, 2010

With the new improvements in the fuel economy engines and to enhance the passenger’s comfort, the topic of active vibration cancellation has received a lot of attention recently by both the automotive industry and researchers. Engine mounts and bushings are the devices used to suppress the transverse and tensional vibrations of engines, respectively. Engine mounts and bushings are primarily designed for the first order vibration of engine. Higher order vibrations, however, are neglected due to their lower amplitudes. Although lots of research has been focused on the improvement of the design and performance of engine mounts, engine bushings has not been addressed well in the literature. This paper focuses on the modeling and design of an active bushing, which addresses the higher order vibrations in engines. Such a bushing has a significant advantage in the ride quality of the newly commercialized variable displacement engine (VDE), where the amplitude of vibration induced by switching is higher than normal engines. For VDEs the higher amplitude of vibration makes the higher orders sensible. Isolation of these vibrations is beyond the capabilities of the passive hydraulic bushings. In this paper the design of a novel active chamber is proposed, which is ultimately utilized to control the fluid pressure inside the bushing. It is evident that the fluid pressure significantly contributes to the dynamic performance of the hydraulic bushing. The active chamber described in this paper utilizes a magnetic actuator, excited by electrical current signal, which is fed to a solenoid coil. The pulses produced by the magnetic actuator are used to adjust the pressure at any specific frequency. This feature enables the active chamber not only to alter the frequency response characteristic of the hydraulic bushing, but also to generate complex pressure frequency responses. A mathematical linear model for the magnetic actuator, and the active bushing assembly, is provided and then verified experimentally. The experimental results confirm that the active hydraulic bushing can well address the sophisticated vibration isolation requirements particular to the VDE systems.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

A typical hydraulic bushing and its lumped model of a hydraulic bushing

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Figure 2

Curve fitting the experimental data to identify the bushing parameters

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Figure 3

Pumping chamber assembly and its lumped model

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Figure 4

Active hydraulic bushing lumped model

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Figure 5

Active bushing assembly schematic view

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Figure 6

Control unit to produce the appropriate current for the actuator

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Figure 7

Active hydraulic bushing assembly testbed

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Figure 8

Experimental results of comparison between the active and passive hydraulic bushings

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Figure 9

Bode plot of the controller

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Figure 10

Simulation results of the dynamic stiffness response of the active bushing for different engine modes

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Figure 11

Pumping chamber pressure response with the controlled signal

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Figure 12

Dynamic stiffness response of the active bushing for different engine modes



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