Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
SUSPENSION SYSTEM STUDY ON THE PUSH ROD DOUBLE WISHBONE MODEL WITH VARIABLE STIFFNESS ACTUATOR FOR PERFORMANCE GAIN IN VEHICLES ON THE NORMALIZED DOUBLE LANE CHANGE TEST
Submission Author:
Guilherme Bernardi , SC , Brazil
Co-Authors:
Guilherme Bernardi, Rodrigo de Souza Vieira, Henrique Simas
Presenter: Guilherme Bernardi
doi://10.26678/ABCM.COBEM2023.COB2023-0824
Abstract
One of the most famous tests to verify the performance of vehicles is the double lane change, where the vehicle avoids any unexpected obstacle without hitting cones in the designed lane. Generally, several vehicles fail that test because the tire inside loses contact with the asphalt when the driver turns the steering wheel. This results in a loss of control that can cause the vehicle to hit cones or even tip over. However, approved vehicles often have a gravity center nearer to the ground, suspensions that have more control over the vehicle’s behavior, and a functional traction control system. A suspension system that can be considered with more control of vehicle behavior is the double wishbone push-rod which has prompted interest in using it to improve the performance of disapproved vehicles on the double lane change. The main issue with implementing the double wishbone push-rod suspension in disapproved vehicles is the increase of the natural frequency, which can harm passengers if they are exposed for more than two hours to certain frequency ranges. The stiffness of suspension components is one factor that influences natural frequency, making it essential to develop a device capable of varying suspension properties and behavior. The Variable Stiffness Actuator (VSA) will allow the changing of suspension behavior, enabling it to assume various configurations from a flexible to a rigid one, preventing passengers from being exposed to harmful frequency ranges. This paper aims to present a suspension system study on the push rod double wishbone model with variable stiffness actuator, proposed to improve the performance of vehicles in the double lane change test. A model describing the lateral vehicle dynamics during the handling spin step in the normalized test and an actuator capable of improving vehicle performance were developed through the Davies method and a systematic VSA development. Implementation of VSA on vehicle dynamic model to verify the enhancement of performance, dealing successfully with the stage of the test where typically the tires lose contact with the ground. In conclusion, the implementation of VSA in vehicles is disapproved on the normalized double lane change test, permitting that they can be approved and have more control of the vehicle behavior during curves.
Keywords
variable stiffness actuator, performance, suspension system, Lateral vehicle dynamics model, Davies method
