Eventos Anais de eventos
MECSOL 2022
8th International Symposium on Solid Mechanics
Modeling and Analysis of Active/Passive Vehicle Vibration Attenuation System under Different Road Excitations
Submission Author:
Leonardo Roso Colpo , RS
Co-Authors:
Leonardo Roso Colpo, Herbert Gomes
Presenter: Leonardo Roso Colpo
doi://10.26678/ABCM.MECSOL2022.MSL22-0183
Abstract
The key function of a suspension system in a vehicle is to isolate the passengers from the vibrations originating from the ground, besides guaranteeing the vehicle stability by maintaining all tires in contact. This is usually a trade-off since comfort and stability are conflicting goals which require opposite directions on suspension parameters tuning. Standard suspension designs have only spring and shock absorber elements that can be determined to be efficient in a small range of conditions since they can't adapt and control forces due to necessity. To overcome these barriers, intelligent suspension designs are developed, changing its parameters or adding energy to increase the vehicle's performance. The best acceleration reduction and road holding results are achieved using active suspensions, which exert forces in the system using actuators. In the most common applications, an actuator is placed on each suspension attached to the wheels. The disadvantages of these systems are the high cost of their elements and the large amount of energy required to achieve the performance goals. A potentially viable solution to overcome cost and energy issues in active suspensions is to change the approach of the suspension concept, placing the actuators on the seat of the occupants. This strategy may provide equal performance with considerably less energy, making the active system more viable. This paper proposes a performance study on vibration attenuation of a full car suspension system. The traditional passive system is used initially under road roughness (ISO 8608:1995) and bumps. Then a classic active system is developed, based on Literature references, using a Linear Quadratic Regulator (LQR) to attenuate vibration using actuators on each wheel. Moreover, an active seat model is developed and tuned to achieve the best performance and latter compared to the other systems. Time histories for chassis and driver's seat accelerations are presented, and the systems' control forces and relative performance are compared. Acceleration transmissibility shows the effectiveness and advantages of using such approach.
Keywords
Active suspension, Vibration Attenuation, Vehicle Suspension, random excitation
