Design, control and optimization of vehicle suspensions with inerters

Gerger, Ozan
Inerter is proposed as a mechanical equivalent of the capacitors available in electric circuits. The main advantage of the inerter is to provide a wider design space for a vehicle suspension by adding another suspension element next to spring and damper. Therefore, fine tuning of a suspension performance can be made without subjected to heavy trade-offs. The effect of the addition of inerter to a vehicle suspension and performance of the selected suspension arrangements with passive and semi-active inerters are investigated in this study by using ISO standards. At first, mathematical models of the suspension systems are constructed. In this scope, configurations that are analyzed in this study which are quarter-car model of standard suspension, passive parallel inerter, passive serial inerter and semi-active serial inerter; half-car model of standard suspension, passive serial inerter and semi-active serial inerter are explained with schematics and equations. New type of semi-active inerter control method is proposed based on a sky-hook damping control system. Furthermore, the effect of the inerter on the vertical vehicle dynamics in frequency domain is explained by using the quarter-car models. In the second part of the study, ISO-8608 road profiles are constructed for optimization and performance evaluation purposes. Optimization of the passive suspension parameters are made. Before proceeding into the optimizations, the effect of the inertance, inerter stiffness and suspension damping on the performance of the suspension with passive serial inerter are presented. After the parameters are chosen, the performance of the suspension systems with passive serial inerter and semi-active serial inerter are compared with the standard suspension by using the ISO-2631 ride comfort evaluation methods. Performance evaluations are based on ride quality, tire deflection and suspension deflection in time domain, ride quality in frequency domain. Furthermore, suspension performance when the vehicle passing over a standard hump profiles are also evaluated. Finally, using standard bump profiles and ISO-8608 road profiles simulations are made and the results are presented.


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Citation Formats
O. Gerger, “Design, control and optimization of vehicle suspensions with inerters,” M.S. - Master of Science, Middle East Technical University, 2013.