Statistical Modelling of Lateral Vehicle Loads
نویسندگان
چکیده
A way of describing lateral acceleration for fatigue assessments is discussed. The purpose of the model is to parameterise the different sources of the fatigue load, such as the operating environment and the influence of the driver. The measured lateral acceleration is modelled with an approximative curvature, and the average speed explaining centripetal acceleration in the curve. The difference between the model and the observed lateral acceleration (the residual) is further analysed. An algorithm for extracting the curvature is presented based on road construction requirements and suitable statistical distributions for different driving conditions are suggested. The algorithm is verified using proving ground measurements and video recordings in field. A regression model for the relation between the curvature and the chosen speed is investigated. The acceleration residual is modelled by a transformed normal process. For the model of the centripetal acceleration, explicit expressions for the expected cumulative fatigue damage and range spectrum using rainflow cycles are given. For the residual an upper bound for the expected damage is shown. Comparison between the modelled loads and observed loads are made in terms of cumulative fatigue damage and range spectra. The influence of different drivers and markets are discussed.
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