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Effects of Kingpin Inclination and Caster Angle on Kinematics and Lateral Dynamics of Long Wheelbase School Bus
Technical Paper
2019-26-0219
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Camber angle of steered wheels varies with steering angle as a function of the kingpin inclination angle (KPIA) and caster angle. Thus, the aim of the study herein was to understand the possibility of control of KPIA and caster angle and thus also control camber angle during turn. Hence a detailed study has been done to evaluate the effects of KPIA and caster angle on kinematics and lateral dynamics of the school bus. TruckSimĀ® simulation tool has been used to carry out a simulation study on an 8.5 tonne 6.45 m wheelbase bus model. This open loop study was done to evaluate individual and combined effects of the aforementioned input variables on camber angle which directly influences the kinematic and dynamic response of the bus. Thus, for both KPIA and caster angle variation, handling response metrics were studied for three different manoeuvres, namely straight path driving, steady-state circles and double lane change. The handling response metrics which were analysed include radius of turn, tyre side-slip angles, body slip angle, steering effort as well as aligning moments and forces at tyre road contact. Furthermore, the effect on understeer gradient was evaluated to understand the variation in handling behaviour of the bus with respect to changes in input variables. To determine the effects of caster angle and kingpin inclination angle on the above-mentioned handling metrics, the design of experiments (DOE) has been carried out. A full factorial DOE for a 2-variable (caster angle and KPIA) and 5-level simulation was done to understand the trend of the output parameters. Validation of the results from this work has been done against work presented in the literature. Thus, the outcome of the work helps in assessing the sensitivity of handling response metrics to the input variables discussed here.
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Jambukar, S. and Chandramohan, S., "Effects of Kingpin Inclination and Caster Angle on Kinematics and Lateral Dynamics of Long Wheelbase School Bus," SAE Technical Paper 2019-26-0219, 2019, https://doi.org/10.4271/2019-26-0219.Data Sets - Support Documents
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References
- Murthy , S. , Gowda , M. , and Venna , H. Evaluation of Handling Characteristics of an Intercity Bus by Multi-Body Dynamic Simulations SAE Technical Paper 2016-28-0178 2016 10.4271-2016-28-0178
- Ledesma , R. and Shih , S. The Effect of Kingpin Inclination Angle and Wheel Offset on Medium-Duty Truck Handling SAE Technical Paper 2001-01-2732 2001 10.42.71/2001-01-2732
- Park , S. and Sohn , J. Effects of Camber Angle Control of Front Suspension on the Vehicle Dynamic Behaviors Journal of Mechanical Science and Technology 26 2 307 313 10.1007/s12206-011-1206-1
- Vo , D. , Marzbani , H. , Fard , M. , and Jazar , R. A Novel Kinematic Model of a Steerable Tyre for Examining Kingpin Moment during Low-Speed-Large Steering Angle Cornering SAE Technical Paper 2016-01-8030 2016 10.4271/2016-01-8030
- Yoshino , T. and Nozaki , H. Camber Angle Control Method Corresponding to the Electric Vehicle Age Engineering 6 472 484 2014 10.4236/eng.2014.68049
- Jazar , R. , Subic , A. , and Zhang , N. Kinematics of a Smart Variable Caster Mechanism for a Vehicle Steerable Wheel Vehicle System Dynamics 50 12 1861 1875 2012 10.1080/00423114.2012.699075
- Vo , D. , Jazar , R. , and Fard , M. A Comparison between Caster and Lean Angle in Generating Variable Camber SAE Technical Paper 2015-01-0067 2015 10.4271/2015-01-0067
- Gillespie , T. Fundamentals of Vehicle Dynamics Warrendale Society of Automotive Engineers Inc. 1992 217 220
- Jazar , R. Vehicle Dynamics: Theory and Applications Australia Springer 2006 145 150
- Lee , S. and Jeong , B. Comparisons of Traffic Collisions between Expressways and Rural Roads in Truck Drivers Journal of Safety and Health at Work 7 38 42 2016 10.1016/j.shaw.2015.11.005