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Crosswind Stability Simulation Technology for Performance Design in Model Base Development of Mass-production Vehicles

Article of Honda R&D Technical Review Vol.30 No.1

Summary

A simulation technology was developed that can be used in performance design with respect to crosswind stability for various vehicle types. This involves computation that takes the vehicle model used in the model base development of mass-production vehicles, and combines it with the model of driving conditions used to define actual vehicle tests for evaluation of crosswind stability. For the modeling of driving conditions, in particular, the time when the vehicle is entering the crosswind section and the time when the vehicle is exiting the crosswind section are treated separately, so both a continuous crosswind model, for a crosswind with continuously changing influence on the vehicle, and a discontinuous crosswind model, for discontinuously changing influence, were developed respectively. Combining these to define a half-continuous crosswind model enabled computation time to be shortened while still maintaining the necessary accuracy in calculations for performance evaluation of crosswind stability. The validity of this conceptual approach was verified using a 2014 model year FIT, and this simulation technology has enabled the study of specifications by means of crosswind stability simulation, for the development of other mass-production vehicles as well. The effectiveness of the technology was verified in development of the 2018 model year N-BOX.

Reference

(1) Toyoshima, T., Matsuzawa, T., Ito, K., Endo, Y., Takano, H., Ushimura, T.: Development of Chassis Performance Design Technologies for MBD of Mass-production Vehicles, Honda R&D Technical Review, Vol. 29, No. 1, p. 52-62
(2) Toyoshima, T., Matsuzawa, T., Ushimura, T.: Lap Time Simulation Technology for Performance Design during Production Car Development, Honda R&D Technical Review, Vol. 29, No. 2, p. 124-133
(3) ISO 12021-1: Road vehicles - Sensitivity to lateral wind - Open-loop test method using wind generator input, (2010)
(4) JASO Z108: 2004, Road vehicles - Test procedure of lateral wind stability (in Japanese)
(5) Takada, H., Nakagawa, K., Shinoda, H.: Crosswind Stability of 1-box Car, Journal of Society of Automotive Engineers of Japan, Vol. 43, No. 3, p. 119-126, (1989) (in Japanese)
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(7) Maruyama, Y., Yamazaki, F.: NUMERICAL ANALYSIS AND DRIVING SIMULATOR EXPERIMENT ON THE STABILITY OF A VEHICLE UNDER STRONG CROSS-WIND, Proceedings of JSCE, No. 766, I-68, p. 129-140, (2004) (in Japanese)
(8) Nakasato, K., Takase, H., Kiyono, M., Kouno, K., Ishihara, Y., Shiozawa, H.: Prediction of Aerodynamics Effect on Vehicle Motion under Transient Crosswind Condition, using by Coupling Simulation of CFD (Computational Fluid Dynamics) and MBD (Multi Body Dynamics), JSAE Annual Congress Proceedings, No. 25-14, p. 1-4, (2014) (in Japanese)
(9) URL: http://www.aics.riken.jp/shirutsudoi/meeting9.html
(10) Kuroda, S., Tanaka, S., Ueno, K., Tanaka, H.: Development of aerodynamic transient force measurement running into crosswind, JSAE Annual Congress Proceedings, No. 21-13, p. 1-4, (2013) (in Japanese)
(11) Ryan, A., Dominy, R. G.: The Aerodynamic Forces Induced on a Passenger Vehicle in Response to a Transient Cross-Wind Gust at a Relative Incidence of 30°, SAE Technical Paper 980392, p. 1-4, (1998)

Author (organization or company)

Takayuki TOYOSHIMA(Automobile R&D Center)、Yoshitomo AZEKATSU(Automobile R&D Center)、Naofumi IKEDA(HRD Sakura)

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