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Masters Thesis | Control Systems Engineering | India | Volume 12 Issue 5, May 2023

Finite Frequency Controller for Vehicle Active Suspension System

Libi A

Abstract: This paper investigates the problem of vertical vibration control of an active vehicle suspension system. An active suspension system is a possible way to improve suspension performance. This paper illustrates the design of an output feedback H? controller and state feedback H? controllers in the entire frequency range as well as in finite frequency range for an active suspension system. The H? performance is used to measure ride comfort so that more general road disturbances can be considered. Human body is much sensitive to vibrations of frequency 4 - 8 Hz in the vertical direction. The main objective is to reduce the body vertical vibration in this frequency range using an active suspension system. By using Generalized Kalman - Yakubovich - Popov (KYP) lemma, the H? norm from the disturbance to the controlled output is reduced in the particular frequency band. A state feedback controller is designed in the framework of linear matrix inequality (LMI) optimization. In addition, the time domain constraints are guaranteed in the controller design. A quarter car model with active suspension system is considered in this work and the effectiveness of the approach is illustrated by using simulations.

Keywords: Active suspension system, Quarter car model, H controllers, Vertical vibration control, Generalized KYP lemma, Linear matrix inequality, LMI

Edition: Volume 12 Issue 5, May 2023,

Pages: 60 - 67