The Calculation Method of International Roughness Index

Academic calculation method of quarter car model is studied firstly.Ideal experiment platform and simulation data are used in calculation method experiment.This method can eliminate the influence of some factors which affect final result.Experiment is divided into three steps.Firstly,0 is given as start value and the result proves that this method can cause the most deviation.In order to lower the deviation,statistic interval must be no less than 100 meters.Secondly,11 meters warm up value is given as start value and the result proves that 100 meters may be the best choice as statistical interval.Lastly,continuous start value is used as the next interval start value.This method is proved as an effective way to control deviation.The suggestion of data head cutting interval is no less than 50 meters.