This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effect of Semi-Active Front Axle Suspension Design on Vehicle Comfort and Road Holding for a Heavy Truck
Technical Paper
2012-01-1931
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Semi-active suspension systems for ground vehicles have been the
focus of research for several years as they offer improvements in
vehicle comfort and handling. This kind of suspension has attracted
more interest compared to active suspension systems especially due
to lower cost and energy consumption.
In this paper the capabilities of a semi-active front axle
suspension are investigated for a commercial vehicle. A half-truck
model of a 4x2 tractor and semitrailer combination is developed in
Matlab/Simulink for this purpose. Also, a 2 DOF roll plane model is
considered to capture the roll motion of the vehicle body mass.
Employing the above-mentioned models, results from on-off and
continuous variable semi-active damping systems are compared to the
ones from the passive suspension system according to ride comfort
and handling safety characteristics. Simulations are performed in
the time domain with realistic road-induced excitations, namely
random road and single/double-sided bump inputs, applied on the
wheel road contact points.
Ride comfort is evaluated using the acceleration signals in the
cab by studying acceleration peak values as well as PSD plots of
the iso-filtered accelerations. Cab center of gravity pitch and
body roll motions are also assessed. Furthermore, handling in terms
of road-holding characteristics is examined by means of analyzing
dynamic tire forces while monitoring rattle space (suspension
deflection) simultaneously.
The control strategies of the semi-active damping are based on
the skyhook theory, in which the damping coefficient is either
switchable or continuously controlled. Skyhook, groundhook and
hybrid control laws have been implemented and evaluated in the
vehicle models.
The results of the comparison analysis that are presented
quantitatively and qualitatively clearly show the great influence
of the semi-active dampers on the vehicle dynamic properties for
the conducted simulations. With continuous semi-active dampers
accelerations in the cab are drastically decreased particularly up
to front axle resonance frequency. Hence, unlike passive suspension
that is a compromise between ride comfort and handling, semi-active
suspension facilitates enhancing both target criteria.
Authors
Topic
Citation
Yarmohamadi, H. and Berbyuk, V., "Effect of Semi-Active Front Axle Suspension Design on Vehicle Comfort and Road Holding for a Heavy Truck," SAE Technical Paper 2012-01-1931, 2012, https://doi.org/10.4271/2012-01-1931.Also In
References
- Cole, D. J. Fundamental issues in suspension design for heavy road vehicles Vehicle System Dynamics 35 4 319 360 2001
- Fukushima, N. Hidaka, K. Iwata, K. Optimum characteristics of automotive shock absorbers under various driving conditions and road surfaces International Journal of Vehicle Design 4 5 1983
- Karnopp, D. C. Crosby, M. J. The active damper, The Shock and Vibration Bulletin 43 Naval Research Laboratory Washington, DC 1973
- Ivers, D. Miller, L. “Experimental Comparison of Passive, Semi-Active On/Off, and Semi-Active Continuous Suspensions,” SAE Technical Paper 892484 1989 10.4271/892484
- Cao, D. Song, X. Ahmadian, M. Editors' perspectives: road vehicle suspension design, dynamics, and control Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility 49 1-2 3 28 2011
- Ahmadian, M. Goncalves, F. “A Frequency Analysis of Semiactive Control Methods for Vehicle Application,” SAE Technical Paper 2004-01-2098 2004 10.4271/2004-01-2098
- Ahmadian, M. Marjoram, R. “Effects of Passive and Semi-Active Suspensions on Body and Wheel Hop Control,” SAE Technical Paper 892487 1989 10.4271/892487
- Naraghi, M. Najaf zadeh, E. “Effect of Heavy Vehicle Suspension Designs on Dynamic Road Loading - A Comparative Study,” SAE Technical Paper 2001-01-2766 2001 10.4271/2001-01-2766
- Bouazara, M. Richard, M. J. An optimization method designed to improve 3-D vehicle comfort and road holding capability through the use of active and semi-active suspensions European Journal of Mechanics - A/Solids 20 3 509 520 2001
- Motta, D. Zampieri, D. Pereira, A. “Optimization of a Vehicle Suspension Using a Semi-Active Damper,” SAE Technical Paper 2000-01-3304 2000 10.4271/2000-01-3304
- Cebon, D. Besinger, F. H. Cole, D. J. Control strategies for semi-active lorry suspensions Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 210 2 161 178 1996
- Williams, D. E. Haddad, W. M. Active suspension control to improve vehicle ride and handling Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility 28 1 1 24 1997
- Holen, P. Experimental evaluation of modally distributed damping in heavy vehicles Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility 46 6 521 539 2008
- Gillespie, T. “Heavy Truck Ride,” SAE Technical Paper 850001 1985 10.4271/850001
- Ahmadian, M. “Semiactive Fuzzy Logic Control for Heavy Truck Primary Suspensions: Is it Effective?,” SAE Technical Paper 2005-01-3542 2005 10.4271/2005-01-3542
- International Organization for Standardization Mechanical vibration - Road surface profiles - Reporting of measured data, ISO 8608 1995 1995
- International Organization for Standardization Mechanical vibration and shock - Evaluation of human exposure to whole-body vibration, ISO 2631-1 1997