Study the Instability Dynamic of a Bus in Crosswind Conditions
Main Article Content
Abstract
When a grand bus is moving on the road, aerodynamic forces and moments can be the main cause of vehicle instability and accidents. Therefore, studying the influence of aerodynamic forces and moments on the instability of grand buses is a matter of concern. This article investigates bus' safety when moving in crosswind conditions with three types of motion instability: loose, rollover, and sideslip. A static model is use to determine the speed limits when the vehicle is unstable. The basic equations are selected based on the assumption that the vehicle moves straight on the plane. The aerodynamic forces and moments are characterized by the aerodynamic coefficients determined by the aerodynamic simulation model of the bus. The article has focused on determining the limit speeds of crosswinds that cause instability of the 45-seat bus by numerical method. The results of the study can be used as a basis for assessing the influence of aerodynamic forces on the dynamic instability of the bus during the movement on the road in complex windy conditions.
Keywords
crosswind, grand bus, instability, rollover, sideslip
Article Details
References
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[9] D.T. Quyet, N.T. Hoan, T.M. Hoang, Study on computation of aerodynamic force acting on bus in crosswind conditions by using CFD, The First International Conference on Fluid Machinery and Automation Systems ICFMAS2018, Hanoi, Vietnam, pp. 522-527, 2018.
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[2] C.J. Baker, A simplified analysis of various types of wind-induced road vehicle accidents, J. Wind Eng. Ind. Aerodyn. Vol. 22(1), pp.69-85, 1986. https://doi.org/10.1016/0167-6105(86)90012-7
[3] C.J. Baker, High sided articulated road vehicles in strong cross winds. J. Wind Eng. Ind. Aerodyn. Vol. 31, pp. 67–85, 1988. https://doi.org/10.1016/0167-6105(88)90188-2
[4] W.H. Guo, Y.L. Xu, Dynamic analysis of moving road vehicle under a sudden crosswind. Key Eng. Mater. Vol. 243–244, pp. 141–146, 2003. https://doi.org/10.4028/www.scientific.net/KEM.243-244.141
[5] M. Batista, M. Perkovič, A simple static analysis of moving road vehicle under crosswind, J. Wind Eng. Ind. Aerodyn. Vol. 128, pp. 105–113, 2014. https://doi.org/10.1016/j.jweia.2014.02.009
[6] Z. Zhang, J. Li, W. Guo, Combined simulation of heavy truck stability under sudden and discontinuous direction change of crosswind with computational fluid dynamics and multi-body system vehicle dynamics software, Advances in Mechanical Engineering Vol. 10, pp. 1-10, 2018. https://doi.org/10.1177/1687814018786364
[7] T.D. Gillespie, Fundamentals of Vehicle Dynamics. SAE Inc., Warrendale, PA, 1992. https://doi.org/10.4271/R-114
[8] T.H. Tung, Research for improvement the aerodynamic shape of coach assembled in Vietnam, Ph.D. dissertation, Hanoi University of Science and Technology, 2016.
[9] D.T. Quyet, N.T. Hoan, T.M. Hoang, Study on computation of aerodynamic force acting on bus in crosswind conditions by using CFD, The First International Conference on Fluid Machinery and Automation Systems ICFMAS2018, Hanoi, Vietnam, pp. 522-527, 2018.
[10] D.T. Quyet, N.T. Hoan, T.M. Hoang, Determining aerodynamic forces acting on the bus by experiment, Vietnam Mechanical Engineering Journal, Vol. 10, pp.406-411, 2020.