Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests

This paper discusses that the unsteady aerodynamic forces caused by vehicle motion in road input have a large influence on the vehicle behaviors. In the present coupling analysis, unsteady aerodynamic forces were obtained by using the response functions for vehicle motion derived in our previous stu...

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Autores principales:	Kazuhiro MAEDA, Daisuke TSUBAKINO, Susumu HARA, Akihiro SASOH
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	road vehicle aerodynamics unsteady aerodynamic force vehicle dynamics coupling analysis response function motion simulation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/20d85609a4844490b49a685e42c1e4c8
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id	oai:doaj.org-article:20d85609a4844490b49a685e42c1e4c8
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spelling	oai:doaj.org-article:20d85609a4844490b49a685e42c1e4c82021-11-29T06:09:58ZCoupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests2187-974510.1299/mej.21-00095https://doaj.org/article/20d85609a4844490b49a685e42c1e4c82021-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/4/8_21-00095/_pdf/-char/enhttps://doaj.org/toc/2187-9745This paper discusses that the unsteady aerodynamic forces caused by vehicle motion in road input have a large influence on the vehicle behaviors. In the present coupling analysis, unsteady aerodynamic forces were obtained by using the response functions for vehicle motion derived in our previous study. By attaching a protrusion on the roof which only measures about 3% of the vehicle height, pitch and heave motions are affected significantly by the change of unsteady aerodynamic effects. Due to the coupling of the unsteady aerodynamic forces and vehicle suspension responses, the vehicle behavior depends on the road input frequency. The pitch motion is enhanced in low-frequency road input (<1.6 Hz for a real vehicle) and is suppressed at high frequencies (>1.6 Hz). Meanwhile, the heave motion is suppressed over 1.2 Hz. Such vehicle behaviors were verified in actual running tests, and were consistent to the subjective evaluation of the drivers feeling. Comparing the unsteady aerodynamic coefficients to the equivalent vehicle specification factors, the aerodynamic inertia caused by pitch motion contributes to 39% of the rear vehicle mass inertia effect in pitch motion. This aerodynamic effect is important in designing suspension specifications of vehicles. These results show that the vehicle stability can be affected even by small detail in vehicle shape due to the unsteady aerodynamic forces.Kazuhiro MAEDADaisuke TSUBAKINOSusumu HARAAkihiro SASOHThe Japan Society of Mechanical Engineersarticleroad vehicleaerodynamicsunsteady aerodynamic forcevehicle dynamicscoupling analysisresponse functionmotion simulationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 4, Pp 21-00095-21-00095 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	road vehicle aerodynamics unsteady aerodynamic force vehicle dynamics coupling analysis response function motion simulation Mechanical engineering and machinery TJ1-1570
spellingShingle	road vehicle aerodynamics unsteady aerodynamic force vehicle dynamics coupling analysis response function motion simulation Mechanical engineering and machinery TJ1-1570 Kazuhiro MAEDA Daisuke TSUBAKINO Susumu HARA Akihiro SASOH Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests
description	This paper discusses that the unsteady aerodynamic forces caused by vehicle motion in road input have a large influence on the vehicle behaviors. In the present coupling analysis, unsteady aerodynamic forces were obtained by using the response functions for vehicle motion derived in our previous study. By attaching a protrusion on the roof which only measures about 3% of the vehicle height, pitch and heave motions are affected significantly by the change of unsteady aerodynamic effects. Due to the coupling of the unsteady aerodynamic forces and vehicle suspension responses, the vehicle behavior depends on the road input frequency. The pitch motion is enhanced in low-frequency road input (<1.6 Hz for a real vehicle) and is suppressed at high frequencies (>1.6 Hz). Meanwhile, the heave motion is suppressed over 1.2 Hz. Such vehicle behaviors were verified in actual running tests, and were consistent to the subjective evaluation of the drivers feeling. Comparing the unsteady aerodynamic coefficients to the equivalent vehicle specification factors, the aerodynamic inertia caused by pitch motion contributes to 39% of the rear vehicle mass inertia effect in pitch motion. This aerodynamic effect is important in designing suspension specifications of vehicles. These results show that the vehicle stability can be affected even by small detail in vehicle shape due to the unsteady aerodynamic forces.
format	article
author	Kazuhiro MAEDA Daisuke TSUBAKINO Susumu HARA Akihiro SASOH
author_facet	Kazuhiro MAEDA Daisuke TSUBAKINO Susumu HARA Akihiro SASOH
author_sort	Kazuhiro MAEDA
title	Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests
title_short	Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests
title_full	Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests
title_fullStr	Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests
title_full_unstemmed	Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests
title_sort	coupling analysis of unsteady aerodynamics and vehicle behavior with road input: modeling and verification in road tests
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/20d85609a4844490b49a685e42c1e4c8
work_keys_str_mv	AT kazuhiromaeda couplinganalysisofunsteadyaerodynamicsandvehiclebehaviorwithroadinputmodelingandverificationinroadtests AT daisuketsubakino couplinganalysisofunsteadyaerodynamicsandvehiclebehaviorwithroadinputmodelingandverificationinroadtests AT susumuhara couplinganalysisofunsteadyaerodynamicsandvehiclebehaviorwithroadinputmodelingandverificationinroadtests AT akihirosasoh couplinganalysisofunsteadyaerodynamicsandvehiclebehaviorwithroadinputmodelingandverificationinroadtests
_version_	1718407572720975872

Coupling analysis of unsteady aerodynamics and vehicle behavior with road input: Modeling and verification in road tests

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