Abstract
The problem considered is that of combining results and ideas obtained from simplified models of actively suspended vehicles to obtain a complete scheme for a real vehicle. It is argued that, if the road is considered to be isotropic and the vehicle laterally symmetrical, the symmetric motions of a vehicle in response to a cylindrical road profile and the anti-symmetric motions in response to a pure crosslevel input can be superposed (assuming linearity) to give the total motion. The symmetric problem has been considered extensively in previous work but the antisymmetric problem has not been separated out from the total and studied on its own before. The paper contains such a study. A mathematical model of a car with a limited bandwidth active suspension system and roll freedoms is excited by a cross-level input deriving from white noise. Suspension control laws are obtained by application of a form of linear quadratic optimal control theory and cost function values and frequency responses are used to evaluate performance. It is found that the active suspension is able to make only very modest contributions to improving the performance, in this anti-symmetric mode, of an adequately damped passive suspension.
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References
Hedrick J K and Wormley D N, Active suspension for ground support vehicles — a state of the art review, ASME-AMD, 15, 21–40, 1975.
Morman K N and Giannopoulos F, Recent advances in the analytical and computational aspects of modelling active and passive vehicle suspensions, ASME-AMD, 50, 75–115, 1982.
Goodall R M and Kortüm W, Active controls in ground transportation — a review of the state of the art and future potential, Vehicle System Dynamics, 12, 225–257, 1983.
Sharp R S and Crolla D A, Road vehicle suspension design — a review, Vehicle System Dynamics, 16, 167–192, 1987.
Wallentowitz H and Konik D, Actively influenced suspension systems — survey of actual patent literature, EAEC 3rd International Conference, Vehicle Dynamics and Power Train Engineering, Strasbourg, 1991.
ElBeheiry E M, Karnopp D, ElAraby M E and Abdelraaouf A M, Advanced ground vehicle suspension systems — a classified bibliography, Vehicle System Dynamics, 24, 231–258, 1995.
Aoyama Y., Kawabata K, Hasegawa S, Kaobari Y and Sato M, Development of full active suspension by Nissan, SAE 910747, 1990.
Yokoya Y., Ryotiei K, Kawaguchi H, Ohashi K and Otino H, Integrated control system between active control suspension on four wheel steering for the 1989 Celica, SAE 910748, 1990.
Acker B, Darenberg W and Gall H, Active suspensions for passenger cars, The Dynamics of Vehicles on Roads and Tracks, R J Anderson (ed..) Vehicle System Dynamics Supplement to 18, 15–26, 1990.
Williams R A, Best A and Crawford I L, Refined low frequency active suspension, Vehicle Ride and Handling, MEP, Bury St. Edmunds, 285–300, 1993.
Chalasani R M, Ride performance potential of active suspension systems — part 1: Simplified analysis based on a quarter-car model, ASME-AMD, 80, 1987–202, 1986.
Chalasani R M, Ride performance potential of active suspension systems — part 11: Comprehensive analysis based on a full-car model, ASME-AMD, 80, 205–234, 1986.
Sharp R S and Hassen S A, The relative performance capabilities of passive, active and semi-active car suspension systems, Proc. I. Mech. E., Journal of Automobile Engineering, 200(D3), 219–228, 1986.
Hedrick J K and Butsuen T, Invariant properties of automotive suspensions, Advanced Suspensions, MEP, Bury St. Edmunds, 35–42, 1988.
Yue C., Hedrick J K and Butsuen T, Alternative control laws for automotive active suspensions, Trans. ASME, Jour. Dyn. Syst. Meas, and Control, 111, 286–290, 1989.
Louam N, Wilson D A and Sharp R S, Optimal control of a vehicle suspension incorporating the time delay between front and rear wheel inputs, Vehicle System Dynamics, 17, 317–336, 1988.
Pilbeam C and Sharp R S, On the preview control of limited bandwidth vehicle suspensions, Proc. I. Mech. E., Journal of Automobile Engineering, 207(D3), 185–194, 1993.
Fruehauf F, Kasper R and Luckel J, Design of an active suspension for a passenger vehicle model using input processes with time delays, The Dynamics of Vehicles on Roads and Tracks, O Nordstrom (ed..) Vehicle System Dynamics Supplement to 15, 126–138, 1986.
Crolla D A and Abdel Hady M B A, Active suspension control; performance comparisons using control laws applied to a full vehicle model, Vehicle System Dynamics, 20, 107–120, 1991.
Malek K M and Hedrick J K, Decoupled active suspension for improved automotive ride quality and handling performance, The Dynamics of Vehicles on Roads and Tracks, O Nordstrom (ed..) Vehicle System Dynamics Supplement to 15, 383–398, 1986.
Gordon T J, An integrated strategy for the control of complex mechanical systems based on subsystem optimality criteria, IUTAM Symposium on Optimisation of Mechanical Systems, D Bestie and W Schiehlen (eds), Kluwer, Dordrecht, 97–104, 1996.
Gordon T J, An integrated strategy for the control of a full vehicle active suspension system, Proc. IAVSD Symposium on The Dynamics of Vehicles on Roads and on Tracks, L Segel (ed..) Swets and Zeitlinger, Lisse, in printing.
Lang R and Walz U, Active roll reduction, EAEC 3rd International Conference on Vehicle Dynamics and Powertrain Engineering, EAEC, Strasbourg, 88–92, 1991.
Sharp R S and Pan D, On active roll control for automobiles, The Dynamics of Vehicles on Roads and Tracks, G Sauvage (ed.) Vehicle System Dynamics Supplement to 20, 566–583, 1992.
Sharp R S and Pan D, On the design of an active roll control system for a luxury car, Proc. I. Mech.E., Journal of Automobile Engineering, 207(D4), 275–284, 1993.
Dodds C J and Robson J D, The description of road surface roughness, J. Sound and Vibration, 31, 175–183, 1973.
Kamash K M A and Robson J D, Implications of isotropy in random surfaces, J. Sound and Vibration, 54, 1–15, 1977.
Robson J D, Road surface description and vehicle response, Int. J. Vehicle Design, 1, 25–35, 1979.
Rill G, The influence of correlated random excitation processes on dynamics of vehicles, The Dynamics of Vehicles on Roads and Tracks, J K Hedrick (ed..) Swets and Zeitlinger, Lisse, 449–459, 1984.
Venhovens P J Th, Optimal control of vehicle suspensions, Doctoral Dissertation, Delft University of Technology, 1993.
Clark S K (ed..) Mechanics of pneumatic tires — 2nd ed., NBS Monograph 122, Washington D.C., 1982.
Wilson D A, Sharp R S and Hassan S A, The application of linear optimal control theory to the design of active automotive suspensions, Vehicle System Dynamics, 15, 105–118, 1986.
Press W H, Teukolsky S A, Vetterling W T and Flannery B P, Numerical recipes in FORTRAN; the art of scientific computing — 2nd ed., Cambridge University Press, 1992.
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Sharp, R.S. (1997). Decoupling in Automotive Active Suspension System Design. In: Van Campen, D.H. (eds) IUTAM Symposium on Interaction between Dynamics and Control in Advanced Mechanical Systems. Solid Mechanics and Its Applications, vol 52. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5778-0_44
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DOI: https://doi.org/10.1007/978-94-011-5778-0_44
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