Emergency Braking Distance Calculation
# NOTE : Please read Para 'Limitations of online EBD simulation tool'. This is an online demo simulation tool and results of online EBD simulation tool may have some error due to these limitations. However, our offline software tools do not have such limitations and provide much accurate simulation results. For detailed description of technical terms used in this simulation tool, please read 'Technical Terms' & 'Performance Parameters' sections of this website.
Note :- User may input equal value of 'OA' & 'EB' / 'FC' & 'GD' (i.e. OA=EB & FC=GD) , if 'AB' & 'CD' portions of BE graph are horizontal.
A linear transient of braking force is considered in EBD simulation tool. Hence, the braking equivalent activation time 'tb' is obtained by adding the absolute delay and a half of the full braking force build up time. Following formulas may be used to calculate the braking equivalent activation time as function of the passenger train length L in meter for emergency braking through brake pipe only :
tb = 3.5 + 0.15*( L/100 )2
Note : Above formula is not applicable to calculate the braking equivalent activation time for service brake application through brake control electronic.
In this simulation tool, it is assumed that the value of brake friction coefficient remains constant during full speed range and train is developing specified braking effort as per given Braking Effort Vs Speed graph. However, in actual, the value of friction coefficient does not remain constant in complete braking operation and a small variation is observed in the value of friction coefficient with change in brake block temperature, train speed and other environmental conditions.
Calculation of EBD can not be calculated on the basis of brake block type, pressure in brake cylinder, area of brake cylinder & break shoe etc.