Please use this identifier to cite or link to this item: http://hdl.handle.net/10266/5516
Title: Vehicle Dynamics Performance Optimization of a New Generation Multi-Axle Truck
Authors: Shah, Rishi
Supervisor: Kumar, Devender
Setia, Gautam
Gupta, Amit
Keywords: Vehicle Dynamics;Multi Axle Truck;Brake Steer;Bump Steer;Vehicle Handling
Issue Date: 19-Jul-2019
Abstract: The main objective of this thesis work is to study the vehicle dynamics of a new generation heavy-duty commercial vehicle i.e. Truck by optimizing steering and suspension kinematics characteristics of the vehicle. Initial stage of present project was to define the problem so that critical attention could be paid on important points. Due to implementation of Increased Axle Load (IAL) regulation, major changes in the design of steering and suspension system is required to be made. Simulations were carried out based on existing suspension and steering system hardpoints. It was found that for the new vehicle development, improvements have to be made in the suspension and steering kinematics linkages in order to meet defined target values of brake steer, bump steer, Ackerman error, pitman arm & drag link toggle, caster & camber change with wheel travel etc. in order to fulfill drivers expectations of ride and comfort. In second step, model of front suspension and steering system is created in ADAMS/View and using rule of thumb improvements and sensitivity analysis method, number of hardpoints is decreased which are then used to optimize its linkages. In next step, vehicle handling behavior is studied in ADAMS/Car where full vehicle model is made and constant circular test is done. New design is released on the basis of hardpoints obtained from the optimization study. Prototype vehicle is made and various physical tests are performed whose results are compared with the results obtained through simulations. Results are in good agreement with the simulated results and shows that there is significant improvement on the steering performance of the vehicle. Some of the major other problems which were not identified during simulations but appeared on prototype vehicle were identified and their corrective actions without bringing any changes in steering or suspension linkages are proposed. Steer by brake technique didn’t solve the problem completely. Use of electronic control of lift axle helped in achieving TCD target. Concept of caster steer axle was evaluated through simulation in ADAMS/Car. It is proposed that the vehicles highly understeer behavior and problem of not meeting TCD requirement will be resolved using caster steer lift axle instead of non-steerable lift axle.
Description: This thesis in collaboration with TATA Motors, Pune on live project for new vehicle development.
URI: http://hdl.handle.net/10266/5516
Appears in Collections:Masters Theses@MED

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