Noticeable Problems of Braking Calculation for High Speed Train

Abstract

The effort per gravity N·kN~(-1) is legally determined to the unit of specific effort(train resistance or tractive effort or braking effort)on《Regulations on Railway Train Traction Calculation》in the year 1998,so the unit of specific effort must be unitized on the legal unit for braking calculation of high speed train in China,then the established series calculative formulas should be used to any form.The paper points out that the rotary mass coefficient should not be neglected for braking calculation of high speed motor train units(emu or dmu)and the rotary mass coefficient of evenly traction mode(distributed power)is higher than pull-push mode(concentrated power).In addition,the practical formulas of braking adhesion coefficient(wet rail and dry rail)on Chinese railway are put forward.