Title page for ETD etd-02212012-204837


Type of Document Dissertation
Author Umsrithong, Anake
Author's Email Address uanake@vt.edu
URN etd-02212012-204837
Title Deterministic and Stochastic Semi-Empirical Transient Tire Models
Degree PhD
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Sandu, Corina Committee Chair
Chan, Brendan Juin-Yih Committee Member
Ferris, John B. Committee Member
Sandu, Adrian Committee Member
Taheri, Saied Committee Member
Keywords
  • tire model
  • uncertainties
  • vehicle dynamics
Date of Defense 2012-02-10
Availability unrestricted
Abstract
The tire is one of the most important components of the vehicle. It has many functions, such as supporting the load of the vehicle, transmitting the forces which drive, brake and guide the vehicle, and acting as the secondary suspension to absorb the effect of road irregularities before transmitting the forces to the vehicle suspension. A tire is a complex reinforced rubber composite air container. The structure of the tire is very complex. It consists of several layers of synthetic polymer, many flexible filaments of high modulus cord, and glass fiber, which are bonded to a matrix of low modulus polymeric material. As the tire is the only component of the vehicle which makes contact with the road surface, almost all forces and moments acting on the vehicle must be transferred by the tire. To predict the dynamics of the vehicle, we need to know these forces and moments generated at the tire contact patch. Therefore, tire models that accurately describe this dynamic behavior are needed for vehicle dynamic simulation. Many researchers developed tire models for vehicle dynamic simulations; however, most of the development in tire modeling has been limited to deterministic steady-state on-road tire models.

The research conducted in this study is concerned with the development of semi-empirical transient tire models for on-road and off-road vehicle simulations. The semi-empirical transient tire model is developed based on existed tire models, analytical tire structure mechanics analysis, and experimental data collected by various researchers. The tire models were developed for vehicle traction, handling and ride analysis. The theoretical mechanics analysis of the tire model focused on the determination of tire and terrain deformation. Then, the results are used together with empirical data to calculate the force response and the moment response. Moreover, the influence of parametric uncertainties in tire parameters on the tire-terrain interaction is investigated. The parametric uncertainties are quantified and propagated through the tire models using a polynomial chaos theory with a collocation approach. To illustrate the capabilities of the tire models developed, both deterministic and stochastic tire models are simulated for various scenarios and maneuvers. Numerically simulated results are analyzed from the perspective of vehicle dynamics. Such an analysis can be used in tire and vehicle development and design.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Figure_2_1_Fair_Use.pdf 118.98 Kb 00:00:33 00:00:16 00:00:14 00:00:07 < 00:00:01
  Figure_2_2_Fair_Use.pdf 119.18 Kb 00:00:33 00:00:17 00:00:14 00:00:07 < 00:00:01
  Figure_2_4_Fair_Use.pdf 121.37 Kb 00:00:33 00:00:17 00:00:15 00:00:07 < 00:00:01
  Figure_2_5_Fair_Use.pdf 120.97 Kb 00:00:33 00:00:17 00:00:15 00:00:07 < 00:00:01
  Figure_2_6_Fair_Use.pdf 121.92 Kb 00:00:33 00:00:17 00:00:15 00:00:07 < 00:00:01
  Umsrithong_A_D_2012.pdf 27.55 Mb 02:07:33 01:05:36 00:57:24 00:28:42 00:02:26

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.