Simulation of a multivariate and multidimensional turbulent wind velocity, and the consequential effect on a moving ground vehicle

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Title: Simulation of a multivariate and multidimensional turbulent wind velocity, and the consequential effect on a moving ground vehicle
Author: Semrad, James Matthew
Abstract: A multidimensional and multivariate turbulent wind velocity is computed for two points on a moving vehicle , and then used to determine the consequential aerodynamic side force and yawing moment . The main objective is to provide a subroutine , with the above capabi1ities , that may be used by the ADAMS code in simulatinq the dynamic response of a moving automobile in a turbulent atmospheric wind fîeld . The wind fluctuations are derived from a Fourier time series representation of the power spectral density function appropriate for a reference frame moving perpendicular to the mean wind speed . The side forces and yawing moments are calculated from the resultant relative wind speeds at points on the front and back sections of the vehicle cummulatively . The statistical characteristics of the simulated wind time series are evaluated for the mean wind speed , mean wind direction , root -mean -square variance , auto -correlation , and cross -correlation . It is demonstrated that all of these features compare favorably with their respective tarqet values when a sufficîent number of discrete frequency components is used in the Fourier time series .
URI: http : / /hdl .handle .net /2346 /13917
Date: 1988-05

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Simulation of a multivariate and multidimensional turbulent wind velocity, and the consequential effect on a moving ground vehicle. Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /13917 .

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