This paper presents the results of vibration isolation analysis for the pump/motor component of hydraulic hybrid vehicles (HHV). The hybrid subsystem can potentially improve the fuel efficiency of the vehicle by recovering some of the energy that is otherwise wasted in friction brakes. High pressure hydraulic fluid “assists” the engine in the initial acceleration period. Noise and vibration are an issue with these systems due to the variable hydraulic loads that are applied to the regenerative hybrid element. This study looks into the possibility of reducing the transmitted noise and vibration to the vehicle’s chassis by using smart magnetorheological (MR) dampers. MR dampers utilize MR fluid which is made of pure iron particles suspended in a carrier fluid. MR fluids deliver variable yield stress under the effect of a controllable electromagnetic field. To this end, an MR damper is modeled and simulated. In the simulation both shock and vibration loads are considered. The simulation results are compared with the performance of regular elastomer isolators. It is shown that the MR damper can effectively reduce the vibration for different working cycles of the regenerative system.

1.
Stelzer
,
Schulz
,
Kim
and
Allemang
,
2003
: “
A Magnetorheological Semi-active Isolator to Reduce Noise and Vibration Transmissibility in Automobiles
.”
Journal of Intelligent Material Systems and Structures
, Vol.
14
, pp.
743
765
.
2.
Ahmadian
and
Ahn
,
1999
:
Performance Analysis of Magneto-Rheological Dampers
.
Journal of Intelligent Material Systems and Structures
, Vol.
11
, pp.
248
256
.
3.
Choi
,
Lee
and
Park
,
2002
: “
H Control Performance of a Full-Vehicle Suspension Featuring Magnetorheological Dampers
.”
Vehicle System Dynamics
Vol.
38
, [No.
5
], pp.
341
360
.
4.
Pranoto
,
Nagaya
,
Hosoda
,
2004
: “
Vibration suppression of plate using linear MR fluid passive damper
.”
Journal of Sound and Vibration
276
, pp.
919
932
.
5.
Yoshida
and
Dyke
,
2004
: “
Seismic control of a nonlinear benchmark building using smart dampers
.”
Journal of Engineering Mechanics
Vol.
130
[No.
4
], pp.
386
392
6.
Wyczalek
Floyd A.
,
2001
: “
Hybrid Electric Vehicles - Year 2000 Status
.”
IEEE Aerospace and Electronic Systems Magazines
Vol.
16
, pp.
15
19
.
7.
United States Environmental Protection Agency (EPA), 2004: “Progress Report on Clean and Efficient Automotive Technology under Development at EPA - Interim Technical Report.” Office of Transportation and Air Quality
8.
Matheson and Stecki, 2003: “Development and Simulation of Hydraulic-Hybrid Powertrain for Use in Commercial Heavy Vehicles.” SAE Technical Paper Series - International Truck and Bus Meeting and Exhibition.
9.
Kepner, R. P., 2002: “Hydraulic Power Assist - A Demonstration of Hydraulic Hybrid Vehicle Regenerative Braking in a Road Vehicle Application.” SAE Technical Paper Series - International Truck and Bus Meeting and Exhibition.
10.
Fact sheet, 2004: “World First Full Hydraulic Hybrid SUV.” 2004 SAE World Congress.
11.
Sun, Thomas and Gray Jr., 2004: “An HCCI Engine - Power Plant for a Hybrid Vehicle.” SAE Technical Paper Series - 2004 SAE World Congress.
12.
Jackey, Smith and Broxham, 2005: “Physical System Model of a Hydraulic Energy Storage Device for Hybrid Powertrain Applications.” SAE Technical Paper Series - 2005 SAE World Congress.
13.
Shimoyama, Ikeo, Koyabu, Ichiryu and Lee, 2004: “Study on Hybrid Vehicle Using Constant Pressure Hydraulic System with Flywheel for Energy Storage.” SAE Technical Paper Series - Powertrain & Fluid Systems Conference and Expo.
14.
Lord Corporation Website, http://www.lord.com
15.
Virginia Tech University Advanced Vehicle Dynamics Lab, http://www.me.vt.edu/avdl
16.
Giuclea, Sireteanu, Stancioiu and Stammers, 2004: “Model parameter identification for vehicle vibration control with magnetorheological dampers using computational intelligence methods.” Proceedings of Institution of Mechanical Engineers Vol. 218 Part I: J. Systems and Control Engineering, pp. 569–581.
17.
Gray, Charles L. Jr., 2005: Future Automotive Fuel Options/Implications. Office of Transportation and Air Quality - Advanced Technology Division.
18.
Spencer Jr., Dyke, Sain, and Carlson, 1997: “Phenomenological Model for a Magnetorheological Damper.” Journal of Engineering Mechanics, ASCE 123, pp. 230–238.
19.
Yu
,
Naganathan
and
Dukkipati
,
2001
:
A literature review of automotive vehicle engine mounting systems
.”
Mechanism and Machine Theory
36
, pp.
123
142
.
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