Development of Variable Damping and Variable Stiffness Magnetorheological Fluid Damper for Four Wheeled Passenger Vehicle
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Abstract
A standard automotive suspension with spring and damper has two main functions: to isolate the car from road vibrations and provide better road handling. Investigation into controlled suspension systems has been driven forward by the limitations of passive suspensions. Semi-active suspensions were selected for this research because of their better reliability, reduced cost and comparable performance. The spring rate and damping characteristics are not able to be modified of a passive suspension system to obtain acceptable behaviour across the whole operating frequency range. The damping characteristics have been modified by means of a Magneto-Rheological (MR) fluid damper. The MR fluid damper was developed and it was made to operate effectively across the entire range of its operating frequency. The developed MR damper is experimentally evaluated in a lab test setup to determine its effectiveness. On a laboratory test setup, a recently developed suspension system was subjected to the test. Different spring masses, including 50 kg, 100 kg and 150 kg, were used in this test. The results that were obtained are in the frequency range. Additionally, a mechanism with variable stiffness was suggested to enhance ride comfort. Theoretically, various variable stiffness values generated from the suggested mechanism are determined.
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