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