Print Email Facebook Twitter On the achievable performance using variable geometry active secondary suspension systems in commercial vehicles Title On the achievable performance using variable geometry active secondary suspension systems in commercial vehicles Author Evers, W.J. Besselink, I.G.M. Teerhuis, A.P. Nijmeijer, H. Publication year 2011 Abstract There is a need to further improve driver comfort in commercial vehicles. The variable geometry active suspension offers an interesting option to achieve this in an energy efficient way. However, the optimal control strategy and the overal performance potential remains unclear. The aim of this paper is to quantify the level of performance improvement that can theoretically be obtained by replacing a conventional air sprung cabin suspension design with a variable geometry active suspension. Furthermore, the difference between the use of a linear quadratic (LQ) optimal controller and a classic skyhook controller is investigated. Hereto, an elementary variable geometry actuator model and experimentally validated four degrees of freedom quarter truck model are adopted. The results show that the classic skyhook controller gives a relatively poor performance while a comfort increase of 17-28% can be obtained with the LQ optimal controller, depending on the chosen energy weighting. Furthermore, an additional 75% comfort increase and 77% energy cost reduction can be obtained, with respect to the fixed gain energy optimal controller, using condition-dependent control gains. So, it is concluded that the performance potential using condition-dependent controllers is huge, and that the use of the classic skyhook control strategy should, in general, be avoided when designing active secondary suspensions for commercial vehicles. Subject Mechatronics, Mechanics & MaterialsIVS - Integrated Vehicle SafetyTS - Technical SciencesReliable Mobility SystemsTrafficMobilityActive suspensionHeavy duty vehiclesRide comfortSuspension controlVariable geometryActuatorsAutomobile suspensionsCost reductionGeometryOptimal control systems To reference this document use: http://resolver.tudelft.nl/uuid:325ca822-bd48-4699-9718-49266105b7d1 TNO identifier 435948 ISSN 0042-3114 Source Vehicle System Dynamics, 49 (10), 1553-1573 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.