Research Of Car Unsteady Speed Based On The Improved Trace Energy Method

In the study of the traffic accident problems, the speed calculation of accident vehicle is an important and indispensable part of the traffic accidents analysis and handling, it has important influence to the traffic accident responsibility determination, the domestic and foreign scholars have carried out extensive research of how to accurately calculate the unsteady car speed and have put forward many valuable calculation methods.Trace energy method is the most traditional calculation method of the speed, but in the process of practical application, the calculation precision of traditional trace energy method is poorer, traces the use of energy method and equivalent adhesion coefficient calculation speed of vehicle and few literature research, in order to further raise the trace energy method speed calculation accuracy, the need for further research.In this paper, in order to improve vehicle attachment coefficient calculation accuracy energy method to solve the traditional trace in the defect of adhesion coefficient should be assumed as a fixed value, application of automobile braking principle of load transfer and adhesion coefficient of elliptic equation, build car equivalent adhesion coefficient of mathematical model of asynchronous brake and braking when the rotating side of vertical and horizontal joint equivalent adhesion coefficient of mathematical model and based on the mathematical model of the equivalent adhesion coefficient when the car brake slip.Traces in view of the traditional energy method ignored part of the automobile braking energy losses caused by the problem of low precision, based on the analysis of the vehicle when the car braking energy loss, traces in the traditional energy method, on the basis of mathematical model, combined with the equivalent adhesion coefficient, automotive centroid trajectory equation and car sideslip rotational energy loss equation, the energy method modified trace mathematical model is set up, and put forward a kind of energy method based on modified trace speed calculation method.Traces to verify the improved energy method has the characteristics of highprecision, based on the adhesion coefficient measurement test to obtain the accurate data of asphalt pavement test road road adhesion coefficient, the measured data with traffic accident cases and traces the traditional energy method and the modified traces, and the simulation of energy method, compared with case surveillance video speed.In this paper, to verify the effectiveness of the proposed traces the modified energy method has characteristics of high precision.Energy method combined with modified traces and Austria PC- Crash accident simulation software, simulation results will be gained by the traffic accident and traffic accident case real scene,compared to verify the improved traces the correctness of the energy method proposed.The purpose of this paper is to solve the problems of the traditional trace energy method accuracy is not high and improve the calculation precision of vehicle speed,traffic accidents and adhesion coefficient calculation for car, automobile traffic accident problems such as motion analysis research to provide certain theory reference and provide traffic justice more accurate, impartial analysis data.