Influence of Brake Device Push-out Stiffness on Vibration Performance of Rail Transit Vehicle

Abstract

Objective As a braking mode,electromechanical brake adopts the motor controlled screw rod drive to implement the pushing action, making the brake shoe to contact with the wheel and complete the transmission of brake force and friction brake. It is necessary to study the influence of the new brake mode on the vibration performance of rail transit vehicle. Method The basic structure and the composition of the electromechanical brake and air brake are introduced. The push-out stiffness test and track vibration test of the above two brakes are carried out and the influence of the brake push-out stiffness on vehicle vibration is analyzed. Result & Conclusion The stiffness test shows that the push-out stiffness of the electromechanical brake is much higher than that of the air brake in the normal working area and shows nonlinear characteristics, because it is driven by the motor and not equipped with stomatal piston as the air brake does. In line testing when the electromechanical brake is installed on the vehicle, it is found that compared with the air brake, the electromechanical brake will aggravate the vehicle brake vibration due to the large push-out stiffness, and the vibration acceleration of key components of the vehicle will also increase. Based on the research results, it is suggested that the push-out stiffness of the electromechanical brake shall be reduced to ensure smooth and safe brake processes for vehicles.

Keywords

• railway vehicle
• vibration performance
• push-out stiffness
• vibration transmission