The Effect of Road Profile on the Performance of a Full Car Suspension Model Ride Comfort.

Authors

Bassem Nashaat zakher Assistant Professor, Borg El Arab Technological UniversityFollow
Ibrahim Mahmoud El Fahham professor, Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, EgyptFollow
Mostafa Mohamed Mohamed Associated Professor, Alexandria university- faculty of EngineeringFollow
Mohamed Abdelfattah ElGohary Associated Professor, Alexandrria university- faculty of EngineeringFollow

Abstract

A full-car eight-degrees of freedom model is used to investigate the dynamic response of vehicles subjected to different road profiles on ride comfort. Two road profiles are used in this study, which include the effect of the vehicle mass and moment of inertia on the vehicle ride comfort. In the proposed vehicle model, the masses of the tires, damping, and stiffness are variables. Also, the suspension parameters and the location of the centre of gravity of the vehicle body can be changed. The Lumped Mechanical System interface of COMSOL Multiphysics is used to model the tires, the suspension system, and the seats with a passenger using mass, spring, and damper nodes. The vehicle chassis is modelled as a rigid body with three degrees of freedom in the multi-body dynamics interface. A transient analysis is performed to compute the vehicle motion as well as the seat vibration levels for a given road profile. It was found that the displacement and pitch angular velocity of the vehicle C.G. and front left seat are higher under a rectangular road bump profile than in a sinusoidal road profile. On the other hand, the front left seat acceleration and jerk analysis show that rectangular road profiles also have higher values than sinusoidal road profiles. The recording was uncomfortable in accordance with the ISO standard. In a continuous irregular road profile, however, the values recorded for rectangular bumps are lower than those recorded for single bumps for both acceleration and jerk. Whereas for continuous sinusoidal bumps, extreme values of acceleration and jerk were recorded.

Recommended Citation

zakher, Bassem Nashaat Assistant Professor; El Fahham, Ibrahim Mahmoud professor; Mohamed, Mostafa Mohamed Associated Professor; and ElGohary, Mohamed Abdelfattah Associated Professor (2024) "The Effect of Road Profile on the Performance of a Full Car Suspension Model Ride Comfort.," Journal of Engineering Research: Vol. 8: Iss. 4, Article 13.
Available at: https://digitalcommons.aaru.edu.jo/erjeng/vol8/iss4/13