This study presents a compact hydro-pneumatic strut design with enhanced working area to reduce the design pressure requirements for suspension applications. The two struts are interconnected in the roll plane to realize enhanced roll properties of the suspension. The feedback effects of the interconnecting pipes on the suspension stiffness and damping properties are derived and discussed. The influences of fluid compressibility on the effective ride and roll properties are also investigated. Asymmetric and variable damping valves are further introduced to realize adequately damped and soft ride, and high low speed damping in the roll mode. Fundamental properties of the proposed interconnected configurations are derived and compared with those of the unconnected struts with an anti-roll bar, in terms of suspension vertical stiffness, roll stiffness, and vertical and roll mode damping. Parametric studies are also performed to study the role of interconnecting parameters on the essential suspension properties. The results indicate that interconnected suspension with inherent enhanced roll stiffness and damping characteristics offers significant potential to improve the dynamic roll performance of heavy vehicles, while retaining soft vertical ride. The effectiveness of the proposed concept is further illustrated through simulation results attained under two different deterministic excitations.

1.
Ervin, R.D., 1986, “The dependence of truck roll stability on size and weight variables,” Int. J. of Vehicle Design, Special issue on Vehicle Safety, pp. 192–208.
2.
Winkler, C., 2000, “Rollover of heavy commercial vehicles,” UMTRI Research Review, 31(4).
3.
Sampson, D., 2000, “Active roll control of articulated heavy vehicles,” Ph.D. Thesis, University of Cambridge, UK.
4.
Liu, P.J., 1994, “An analytical study of ride and handling performance of an interconnected vehicle suspension,” Master Thesis, Concordia University, Canada.
5.
Cebon, D., 1999, “Handbook of vehicle-road interactions,” Swets & Zeitlinger, Lisse, Netherlands.
6.
Kusahara, Y., Li, X.S., Hata, N. and Watanabe, Y., 1994, “Feasibility study of active roll stabilizer for reducing roll angle of an experimental medium-duty truck,” AVEC’94, 9438501.
7.
Felez
J.
,
Vera
C.
,
1987
, “
Bond graph assisted models for hydro-pneumatic suspensions in crane vehicles
,”
Vehicle System Dynamics
,
16
, pp.
313
332
.
8.
Su, H., 1990, “An investigation of vibration isolation systems using active, semi-active and tunable passive mechanisms with applications to vehicle suspensions,” Ph.D. Thesis, Concordia University, Canada.
9.
Chaudhary, S., 1998, “Ride and roll performance analysis of a vehicle with spring loaded interconnected hydro-pneumatic suspension,” Master Thesis, Concordia University.
10.
Wu, L.W., 2003, “Analysis of hydro-pneumatic interconnected suspension struts in the roll plane vehicle model,” Master Thesis, Concordia University, Canada.
11.
Cole
D. J.
and
Cebon
D.
,
1996
, “
Truck suspension design to minimize road damage
,”
IMechE J Automobile Eng
,
210
, pp.
95
107
.
12.
Darling, R.J., 1996, “Integrated control of road vehicle dynamics,” Ph.D. Thesis, University of Cambridge, UK.
13.
Dixon, J.C., 1999, “The shock absorber handbook,” SAE Inc., PA, USA.
14.
Dixon, J.C., 1996, “Tires, suspension and handling,” 2nd Edition, SAE Inc., PA, USA.
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