Suspension Kinematics and Unsprung Design (original) (raw)

Kinematic Analysis and Design Optimization of Rear Suspension of an ATV

2020

The objective of this work is to design and analyse the rear suspension of an All Terrain Vehicle. Suspension kinematics are designed for a mini BAJA ATV used in racing using multi body dynamics approach in LOTUS SHARK software. Modifications are done on the current geometry which is a semi trailing arm suspension and rear links are added to increase the adjustability as well reduce the variation of camber, toe, half track width and roll center height. By altering the design the drive shaft articulation limits are achieved which protects the universal joints from damage. By minimizing the variation in toe and camber angle the straight ahead tendency of the car increases also reducing the tire wear on different terrains during the race. The reduction in the variation of half track width and roll center height increases the stability of the vehicle during sharp maneuvers and uneven terrain thus increasing the stability of vehicle. Keywords— All Terrain Vehicles, SAE BAJA, MultiBody Dy...

Improved Vehicle Dynamics with Development in Suspension Geometry

International Journal For Research In Applied Science & Engineering Technology, 2020

The motive of undertaking this work of "Improved Vehicle dynamics with development in Suspension Geometry" is trying to increase the performance of the vehicle by keeping it stable and able to take all the loads coming from the ground and run comfortably. The key areas focused were to maintain minimal roll angle with controlling yaw/roll motions of vehicle and accelerate in a better way. The primary objective of the suspension system in this atv is to maximizing the contact between the tires and the road surface, providing steering stability and good handling, evenly supporting the weight of the vehicle (including the frame, engine, and body), and ensuring the comfort of passengers by absorbing and dampening shock provide safe vehicle control with free from vibrations. Design calculations are done for the geometry and frame as per the requirements. Nx11.0 has been chosen to design the components, Ansys solver is used for the analysis, lotus shark is used for the simulation, Manufacturing is done according to the design using all manufacturing tools with performing various operations and a run-virtual compliance test is performed for checking the vehicle dynamic performance and the vehicle is even tested in a rough-terrain.

IRJET- Design Review of Suspension Assembly of a BAJA ATV

IRJET, 2020

All Terrain Vehicle is designed to move through all terrain. Suspension system of this vehicle should be strong to provide better ride and handling with better comfort. Independent suspension systems are required for this purpose. It is designed using LSSA (Lotus Shark Suspension Analysis). After designing in Lotus, with the hard points the A-arms, front and rear uprights are then designed in CATIA and analyzed it by using ANSYS. It is the system that connects the wheels with chassis by means of an assembly, which provides firmness necessary to compensate shocks from roads. Suspension system defines roll/body angle, effortless steering, camber characteristics and many other factors. The suspension system must be quite rigid in order to bear sudden shocks due to drop, sudden dump etc. The suspension systems of vehicle support in maneuverability and driver's comfort. The suspension designing should withstand ruggedness, driver's fatigue-less driving.

Fine-Tuning Of the Suspension System of Baja ATV

As defined by the American National Standards Institute (ANSI), All-Terrain Vehicle is a vehicle that travels on low-pressure tires and designed to handle a wider variety of terrain. Since it is made to run on different types of terrain, thus stability, vehicle behaviour and driver comfortability in the vehicle are the foremost problems. Once the ATV is manufactured it difficult to change the design according to the track condition but through, proper adjustments and tuning of suspension system like by changing the spring stiffness, problems can be resolved and also the steering problems i.e. understeer, neutral steer, oversteer can also be corrected.

IJERT-Design, Analysis and Optimization of Suspension System for an Off Road Car

International Journal of Engineering Research and Technology (IJERT), 2014

https://www.ijert.org/design-analysis-and-optimization-of-suspension-system-for-an-off-road-car https://www.ijert.org/research/design-analysis-and-optimization-of-suspension-system-for-an-off-road-car-IJERTV3IS090250.pdf Suspension is one of the most vital subsystems of an automobile. The basic function is to isolate the driver from the road shocks. Secondary function includes load transfer, lateral stability and providing adequate wheel travel ensuring ergonomics and driver comforts. The study describes design, analysis and optimization of a suspension system for an off-road buggy. The aim is to compete in SAE INDIA Baja competition. The suspension is designed for a rough terrain giving optimum camber, caster, toe, anti-dive, Roll Centre and Ackermann geometry variations. Compliance studies, effect on suspension bushings, transmissibility of different forces, vibration analysis, quarter car modeling has been carried out. Shock absorber, spring design and mounting considerations are also put forward. The geometry of the suspension has been modelled in commercial software package Lotus Shark. The finite element analysis of various suspension components are done in commercial software ANSYS 14.

Optimized Suspension Design of an Off-Road Vehicle

Suspension system is the term that defines the transmissibility of an off-road vehicle. In order to resist the bumps and jerks that usually occur in an off-road track, an integrated approach of design is developed to obtain an optimized geometry which can give the drivers a ‘fun-to-drive’ experience. This paper describes the development of this suspension and steering geometry design that is fast enough to be used at off-road circuit giving us appropriate camber and caster variations , toe angles , Ackermann geometry , proper flow of forces from chassis to ground and shock absorber characteristics when running on the challenges posed by a rugged off-road track. The geometry design discussed here was achieved through the thorough study of its dimensions, position of installation and application. This vehicle was a Baja off-road prototype which is used in international competitions among universities with its top speed as 45- 65km/hour and its turning radius being 10.5 ft. The car is rear wheel driven.

Design and Optimization of steering and Suspension System of All Terrain Vehicle

IRJET, 2023

One of the most important automotive systems is suspension. The primary purpose is to protect the driver from shocks from the road. In addition to providing proper wheel travel and load transfer, secondary functions also include lateral stability and ergonomics and driver comfort. Vehicles with all-terrain capabilities are built to tackle any surface. Stability, vehicle behavior, and driver comfort are the main issues because the vehicle is designed to operate on various types of terrain. The paper's primary goal was to develop and optimize the front suspension wishbone for a BAJA (ATV) vehicle. The purpose of this study is to analyze the entire suspension system of an ATV vehicle to enhance wheel handling and stability. The entire system was made to be strong enough to absorb shocks from the rough terrain that ATVs are typically used on. Calculations were used to design the springs, and SOLIDWORKS was used to design the components. The front and rear systems were simulated using Lotus software, and the components were examined using commercial FEA software from ANSYS. The steering and suspension system's pivot point, known as the steering knuckle, enables the steering arm to turn the front wheels. The knuckle is put to the test in a variety of loading conditions, including bump, cornering, and braking.

Design, Development & Analysis of Suspension System for All Terrain Vehicle

IRJET, 2023

An all-terrain vehicle is made to travel across any surface. This vehicle's suspension system needs to be robust to deliver a better ride, better handling, and greater comfort. For this, independent suspension systems are necessary. It is created utilizing LSSA (Lotus Shark Suspension Analysis). Following design in Lotus, CATIA is used to create the A-arms, front and rear uprights, and is then examined using ANSYS. The mechanism that attaches the wheels to the chassis via an assembly offers the rigidity required to absorb road shocks. Roll/body angle, smooth steering, camber characteristics, among many other things, are all determined by the suspension system. In order to withstand abrupt shocks brought on by drops, sudden dumps, etc., the suspension system must be rigid. The vehicle's suspension systems aid in the comfort and maneuverability of the driver. The suspension should be designed to endure rough terrain and alert driving.