The force of the car body
When the rolling stock is in operation, the vehicle body is subjected to a large load, mainly including: the weight of the personnel, cargo and equipment loaded in the vehicle body, and the vertical static load generated by the weight of the vehicle body; the locomotive vehicle is caused by the unevenness of the line during operation. The dynamic load generated by the vibration of the body on the spring (see wheel-rail interaction); the longitudinal force generated on the coupler between adjacent rolling stocks during starting, shifting and braking, and the speed of the vehicle on the marshalling yard Longitudinal impact force generated on the coupler cushioning device when the phase is interconnected (see train longitudinal power); centrifugal inertial force of the vehicle body when the rolling stock passes the curve; natural wind and rain and snow load; twisted load due to unbalanced bearing force The side pressure of the bulk or stacked cargo carried by the truck; the traction or braking force transmitted by the bogie to the locomotive body through the traction device during the running of the train (see train traction calculation); various electromechanical devices mounted on the vehicle body The force generated by equipment (such as powertrain, transmission system) and braking system; the force exerted by the loading and unloading machinery on the body of the truck, and so on. In order to ensure the safety of passengers, goods and equipment, the car body must have sufficient strength and rigidity. However, in the event of a serious accident, the passenger car body should be able to produce local plastic deformation to absorb part of the impact energy and reduce passenger casualties.