In a preceding paper an on-road investigation of the longitudinal aerodynamic response of a vehicle to ambient wind was presented. That study resulted in a frequency-dependent response function with a distinctive maximum within the range of the natural frequency of the vehicle on its suspension system. This finding raised the question as to whether the horizontal response of a car’s deceleration to wind gusts is associated with or caused by the suspension’s natural frequency. The objective of the present work is an attempt to shed some light on this question by the investigation of both deceleration and pitch angle fluctuations in additional on-road experiments. Both vehicle velocity and total airspeed in the driving direction and the pitch angle are recorded by independent data acquisition systems during a set of coastdown experiments. The deceleration data and the vehicle’s response to the airspeed fluctuations are derived by differentiation of its velocity-time history and numerical filtering techniques. The experiments reveal a cause-and-effect relation between wind gusts and pitch motion that is additionally supported by model calculations. The study results in frequency-dependent longitudinal vehicle response and pitch angle response functions. Both functions show distinctive maxima, which are clearly separated from each other. This finding implicates that the resonance in the longitudinal vehicle response is caused by an aerodynamic effect.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Analysis of a Vehicle’s Longitudinal Response to an Unsteady Wind Environment


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE World Congress & Exhibition ; 2009



    Publication date :

    2009-04-20




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    2009-01-0005 Analysis of a Vehicle's Longitudinal Response to an Unsteady Wind Environment

    Bischof, G. / Society of Automotive Engineers | British Library Conference Proceedings | 2009



    On-Road Investigation of a Vehicle's Longitudinal Response to Wind Gusts

    Bischof, G. / Society of Automotive Engineers | British Library Conference Proceedings | 2008


    Analysis of a vehicles longitudinal response to an unsteady wind environment

    Bischof,G. / FH Joanneum,Graz,AT | Automotive engineering | 2009


    2008-01-0472 On-Road Investigation of a Vehicle's Longitudinal Response to Wind Gusts

    Bischof, G. | British Library Conference Proceedings | 2008