International Research Journal in Engineering and Emerging Technology (IRJEET) Volume – 01, Issue – 01, March – 2020 www.we-irjeet.com 2019 IRJEET – All Right Reserved 1 | Page Selection Parameter of AVT suspension system Punit Choudhary 1 , Kuldeep Sharma 2 1(Department of Mechanical Engineering / Jaipur Engineering College and Research Centre, India) 2(Training & Placement officer, Professor / Jaipur Engineering College and Research Centre, India) Abstract The Suspension is the most vital sub-system in the automobile. its main function is to load transfer to the wheels and protection of the driver from the road shocks .The purpose of this paper is to select proper suspension system for front and rear of All Terrain vehicles (ATV) and to thereafter design, analyze, simulate and test the suspension system for optimum performance of the vehicle, driver safety and maximum driver comfort. The stability and road handling of vehicle is very important for parameters. The system was designed to be durable enough to withstand with road shocks and vibration from harsh terrain where ATV generally used. The springs were designed by calculation and the components were designed using SOLID WORKS. Keywords: Suspension, AVT, Spring, Anti-drive, Anti-squat, Rolling and Pitching 1. INTRODUCTION Vehicle dynamics is the study of performance of an automobile in all of its motion like ride, acceleration, braking and cornering. Suspension play a key role in all of these motion. The study of vehicle suspension can be broken into two major parts: suspension kinetics and suspension kinematics. Suspension kinetics is study of vibration analysis and suspension kinematics is study of motion of tire as the suspension compress and extends. So for better motion of tire as they compress and extends, some important parameters are considered. These parameters are motion ratio, ride frequency, wheel travel, wheel rate, ride height, roll center, pitch center. The selection criteria of these parameters for ATV are different from commercial vehicles. 1.1. STIFFNESS AND DAMPING The tires stiffness and the tires viscous damping coefficient are important to the ride quality of the vehicle, but more importantly to the handling performance of the vehicle. In typical passenger car vehicles the stiffness of the tires is of an order of magnitude greater than the suspension stiffness. It is typically the tire deflection that is important for the handling performance of the vehicle, because the tire deflection is one of the parameters in which decides the tires grip capabilities. As the deflection of the tire increases, the grip capabilities of the tire will decrease. It is very important to not allow the tire to lose contact with the ground, because if it does the car will not be controllable in handling. Typically, the damping coefficient of the tires is neglected because it is generally very low compared to the other parameters in the system, and neglecting it results in a small error in the analysis in handling. Typically, the damping coefficient of the tires is neglected because it is generally very low compared to parameters in the system, and neglecting it results in a small error in the analysis. 1.2. CORNERING STIFFNESS The tire cornering stiffness is an important parameter in determining the handling performance of the vehicle. It is to some extent arbitrary; each tire has its own stiffness, and the tires on a vehicle can be changed. Therefore the cornering stiffness can be chosen by the user to precisely predict turning (cornering) characteristics of the vehicle. It is this parameter that will determine whether the car is an understeering (the actual cornering radius increases with vehicle speed) or an oversteering (the actual cornering radius decreases with vehicle speed) automobile because the center of mass of the vehicle is a fixed parameter. It is generally better to have an understeering vehicle, because the vehicle is normally more stable. In an oversteering case, the vehicle oversteers the turn, and the driver will be