Coupled 6DoF Motion and Aerodynamic Crosswind Simulation Incorporating Driver Model

Nakasato, Kosuke; Tsubokura, Makoto; Ikeda, Jun; Onishi, K.; Ota, Shoya; Takase, Hiroki; Akasaka, Kei; Ihara, Hisashi; Oshima, Munehiko; Araki, Toshihiko

doi:10.4271/2017-01-1525

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…To enhance the reproducibility of the vehicle response to a crosswind gust, test tracks with crosswind generators have been utilized [5,[20][21][22]. The International Standard ISO 12021:2010 [23] has been formulated for experiments at these facilities.…”

Section: Introductionmentioning

confidence: 99%

Quantitative High Speed Stability Assessment of a Sports Utility Vehicle and Classification of Wind Gust Profiles

Brandt

Sebben

Jacobson

et al. 2020

SAE Technical Paper Series

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The automotive trends of vehicles with lower aerodynamic drag and more powerful drivetrains have caused increasing concern regarding stability issues at high speeds, since more streamlined bodies show greater sensitivity to crosswinds. This is especially pronounced for high vehicles, such as sports utility vehicles. Besides, the competitiveness in the automotive industry requires faster development times and, thus, a need to evaluate the high speed stability performance in an early design phase, preferable using simulation tools. The usefulness of these simulation tools partly relies on realistic boundary conditions for the wind and quantitative measures for assessing stability without the subjective evaluation of experienced drivers. This study employs an on-road experimental measurements setup to define relevant wind conditions and to find an objective methodology to evaluate high speed stability. The paper focuses on the events in proximity to the drivers' subjective triggers of instability. Wind direction and magnitude, vehicle motion response, along with the subjective event triggering were measured at different conditions of the natural wind. A statistical approach was utilized to analyze the correlation between the vehicle response and subjective triggers together with the wind conditions. A correlation was established between the subjective triggers and a rapid change in lateral acceleration and yaw velocity response. The paper also proposes a set of four crosswind gust profiles of interest for driving stability, combining results from previous research and the experimental data of the natural wind obtained in this study. These findings can be used as objective measures for virtually assessing stability performance and as realistic boundary conditions for simulating wind gusts.

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Section: Introductionmentioning

confidence: 99%

Quantitative High Speed Stability Assessment of a Sports Utility Vehicle and Classification of Wind Gust Profiles

Brandt

Sebben

Jacobson

et al. 2020

SAE Technical Paper Series

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“…Therefore, the more realistic method of two-way coupling has been put forward. 17 Nakasato et al 18 demonstrated a two-way coupled numerical simulation method and attained a good application for the method to vehicle performance. Moreover, the comparison of one-way and two-way coupling has been investigated in the following researches.…”

Section: Introductionmentioning

confidence: 99%

Coupled analysis of the unsteady aerodynamics and multi-body dynamics of a small car overtaking a coach

Liu

Huang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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The severe additional aerodynamic loads that are generated on a small car when overtaking a coach have an adverse effect on the car handling stability and its safety. In this article, a two-way coupling of the unsteady aerodynamics and multi-body dynamics is performed in order to study the mutual interactions of a car in an overtaking maneuver with a coach. The unsteady aerodynamic interactions are obtained by using SST (Menter) K-Omega Detached Eddy Simulation and overset mesh technology. The aerodynamics couple the multi-body dynamics, taking into account the effects of the transverse spacing and the cross winds. To validate the necessity of the two-way coupling method, a one-way coupling of the aerodynamics to the vehicle motion is also conducted. Finally, by comparing the aerodynamic loads and the dynamic response of the overtaking car in different overtaking maneuvers between one- and two-way coupling, the results show that it should be considered with two-way coupling analyses of the car while overtaking a coach, particularly under the severe conditions of a lower transverse spacing or the crosswinds.

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“…The results clearly demonstrated the necessity of considering transient aerodynamic forces in dynamic response analysis. The real-time dynamic response and aerodynamic forces could be computed by the kinetics model and the aerodynamic model by using the two-way coupling method (Nakasato et al, 2017;Winkler et al, 2016;Wang et al 2020;Zhang et al 2020). At present, this approach has been used to analyse the aerodynamic performance and dynamic response of the vehicle in crosswinds (Huang et al, 2018;Li et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

Zhang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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The aerodynamic performance and dynamic response of two cars in overtaking maneuver under crosswind were investigated using a multi-car two-way coupling method. The coupling was achieved by exchanging aerodynamic forces obtained by computational fluid dynamic and vehicle dynamic responses acquired by multi-body dynamics in real time. The change rules of the aerodynamic force, moment, yaw angle, and lateral displacement of overtaking and overtaken cars were revealed on the basis of coupling computation. The coupling effect between aerodynamics and dynamics and the interplay between overtaking and overtaken cars were also illustrated. Moreover, the necessity of the two-way coupling was verified. Final results indicated that the posture of the body and the lateral space of the two vehicles are crucial to the stability of the vehicles during the overtaking maneuver, and the interaction between the aerodynamic forces and the dynamic response should be considered.

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Coupled 6DoF Motion and Aerodynamic Crosswind Simulation Incorporating Driver Model

Cited by 11 publications

References 18 publications

Quantitative High Speed Stability Assessment of a Sports Utility Vehicle and Classification of Wind Gust Profiles

Quantitative High Speed Stability Assessment of a Sports Utility Vehicle and Classification of Wind Gust Profiles

Coupled analysis of the unsteady aerodynamics and multi-body dynamics of a small car overtaking a coach

Coupling analysis of transient aerodynamic and dynamic response of cars in overtaking under crosswinds

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