A Criterion for EvaluatingTiltingTrains Return Safety

The return angle stiffness of tilting mechanism can be taken to judge the return safety of tilting trains is put forward. Return angle stiffness describes the stability of car-body returning to neutral position when tilting mechanism loses power during the car-body tilting. When the return angle stiffness is positive, the car-body can return to the neutral position under the action ofweight. When the return angle stiffness is negative, the car-body can not return to the neutral position. When the return angle stiffness is zero, the car-body is in a critical position. Therefore, the return angle stiffness can be used as a criterion for evaluating the return safety of tilting trains.