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MULTI-OBJECTIVE OPTIMIZATION OF ROAD VEHICLE PASSIVE SUSPENSIONS WITH INERTER.pdf

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MULTI-OBJECTIVE OPTIMIZATION OF ROAD VEHICLE PASSIVE SUSPENSIONS WITH INERTER

Proceedings of the ASME 2016 International Design Engineering Technical Conferences Computers and Information in Engineering Conference IDETC/CIE 2016 August 21-24, 2016, Charlotte, USA DETC2016-59864 MULTI-OBJECTIVE OPTIMIZATION OF ROAD VEHICLE PASSIVE SUSPENSIONS WITH INERTER Kesavan Ramakrishnan Department of Mechanical Engineering Politecnico di Milano Milan, 20158 Italy Email: kesavan.ramakrishnan@polimi.it Liunan Yang Department of Mechanical Engineering Politecnico di Milano Milan, 20158 Italy liunan.yang@polimi.it Federico Maria Ballo Department of Mechanical Engineering Politecnico di Milano Milan, 20158 Italy Email: federicomaria.ballo@polimi.it Massimiliano Gobbi Department of Mechanical Engineering Politecnico di Milano Milan, 20158 Italy Email: massimiliano.gobbi@polimi.it Gianpiero Mastinu Department of Mechanical Engineering Politecnico di Milano Milan, 20158 Italy Email: gianpiero.mastinu@polimi.it ABSTRACT The influence of inerter on the performance of passive sus- pension systems is studied by comparing six different suspension architectures using a simplified quarter-car model. The suspen- sion architectures can have one or two springs, damper, and in- erter. Ride comfort, road holding, and working space are con- sidered as the objective functions, while the suspension spring stiffness, damping ratio, and inerter equivalent mass are taken as the design variables for the multi-objective optimization. The Pareto-optimal solutions are computed and compared in the ob- jective functions domain. The results confirm that specific inerter architectures provide advantages when all the design variables are varied. The inerter benefits are more evident in all the con- sidered architectures, when the suspension spring stiffness is kept constant. NOMENCLATURE σx?2 standard deviation of discomfort (m/s 2) σFz standard deviation of road holding (N) σx2?x1 standard deviation of working space (m) Ab road irregularity parameter (m) J rotational inertia of the iner