Experimental Investigation Of The Motion Characteristics Of A Passive Quarter Car Suspension

Tee, Siau Ping (2016) Experimental Investigation Of The Motion Characteristics Of A Passive Quarter Car Suspension. Project Report. UTeM, Melaka, Malaysia . (Submitted)

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Abstract

This research paper will discuss the study of a two degree-of-freedom quarter car model passive suspension system. Vehicle suspension system are rated by the ability to provide good vehicle handling and passenger comfortability. However, these are two conflicting criteria for a passive suspension system. This can be improved by introducing actuators to the system, transforming it into an active suspension system. In this research, the main objectives are to study the motion characteristics of the passive suspension system of a quarter car model. Apart from that, a controller is designed to control platform 1, which represents the road profile of the quarter car model. The setup of the whole research is discussed and illustrated with details. Calibration of the IR sensors used in the research have been carried out. The setup and steps for calibration is included. The calibration results showed the relationship between IR sensor output voltage and measured distance, which output voltage decreases with increasing distance. Besides that, an experiment to determine the effects of tilting the IR sensor is also completed. The results show greater tilt angle decreases IR sensor output voltage at a fixed distance. The output voltage of the IR sensor is converted using a polynomial equation generated from the calibration of sensor. Next, experiments such as open loop characteristics testing using system identification method is carried out to determine the transfer function of the passive suspension system. Once these steps are completed, a closed loop uncompensated system is designed to determine the error between the output and desired input. Then, a proportional-integral-derivative (PID) controller is designed by using manual tuning method. The Kp value is first varied, followed by varying Ki and then Kd. A PID controller with values Kp = 1.35, Ki = 0.021 and Kd = 0.0022 is successfully obtained. Finally, a close-loop evaluation is carried out using the developed PID controller. The controller is able to reduce steady-state error up to 48.9% and rise time up to 67.5%.

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