Prediction Technology of Suspension Damping Performance for Improving the Durability of Hand-made vehicle

자작차의 내구성 향상을 위한 현가장치 감쇠성능 예측 기술

This research presents a method for calculating the fitted curve through the displacement response in order to predict the damping coefficient of the suspension mounted a self-made electric vehicle. A lever system was developed to apply the tensile force of the suspension device, and the displacement response of the step function was calculated by modeling the lever system as a 1-DOF system. The exponential-function fitting curve for time was predicted by using the peak data of the displacement response, and the damping rate was calculated through the time constant and the resonance frequency. The lever system was assumed to be a rigid beam in consideration of the actual jig shape and compared with the step function response of the 1-DOF system through a rigid body dynamics simulation. As a result of comparing the fitting curves, the actual lever system shape and the damping rate of the 1-DOF system were predicted similarly. In order to verify the previously developed damping rate prediction method, an actual lever system was manufactured to measure the acceleration response, and the damping rate was predicted through the curve fitting. The accuracy of the proposed prediction method was verified by comparing the correlation coefficient between the curve fitting and the acceleration response data.