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Shock and Vibration
Volume 16 (2009), Issue 6, Pages 593-605

Ride Performance Analysis of Half-Car Model for Semi-Active System Using RMS as Performance Criteria

S.I. Ihsan,1 M. Ahmadian,2 Waleed F. Faris,1 and E.D. Blancard2

1Mechanical Engineering Department, College of Engineering, International Islamic University Malaysia (IIUM), Malaysia
2Mechanical Engineering Department, Virginia Tech, Blacksburg, VA, USA

Received 25 April 2008; Accepted 15 October 2008

Copyright © 2009 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The work aims to study the root mean square (RMS) responses to acceleration input for four state variables: the ms vertical acceleration, the ms pitch angular acceleration and the front and rear deflections of the suspensions. A half-car two degree-of-freedom model of semi-active control scheme is analyzed and compared with the conventional passive suspension system. Frequency response of the transfer function for the heave, pitch of the sprung mass and suspension deflections are initially compared and then mean square analysis is utilized to see the effect of semi-active scheme. Results indicate that significant improvements were achieved in the sprung mass heave and pitch responses using semi-active control scheme. However results for the rear and front suspension deflection show that there are limiting values of damping coefficient beyond which, the semi-active scheme becomes disadvantageous than the passive system.