Abstract
In order to facilitate system design and performance analysis, a virtual prototype for metro train electropneumatic brakes is proposed. A virtual braking environment that consists of a three-car train model and six electropneumatic brakes model is elaborated. The virtual braking environment can be used to research the relation between braking response and electropneumatic brake’s parameters and to simulate axle loading transfer. By comparing the simulation results with bench test data, the electropneumatic brake model is proven to be quite accurate. Based on the proposed virtual prototype, a test train brake is designed, and a couple of field tests are carried out. The average deceleration of electropneumatic compound service brake at the initial speed of 45 km/h is 0.83 m/s2, the braking distance is 94 m, and that of pure air service brake at the speed of 43 km/h is 0.64 m/s2, the braking distance is 111 m. The field test results satisfy the test train requirements, which further proves the effectiveness of the proposed virtual prototype.
Highlights
Electropneumatic brakes are widely used on metro trains and high-speed trains because of its advantages over pneumatic brakes,[1,2] and its performance directly affects the operation safety and quality of trains.[3]
A virtual braking environment which consists of a three-car train model and six electropneumatic brakes model is elaborated
Where xc is the longitudinal displacement of car body, Fcbxi is the longitudinal force between a car body and its bogies, i 1⁄4 1 for front bogie and i 1⁄4 2 for rear bogie, Fcpfront is the force of the front coupler, Fcprear is the force of the rear coupler, g is the acceleration of gravity, and u is the ramp slope
Summary
Electropneumatic brakes are widely used on metro trains and high-speed trains because of its advantages over pneumatic brakes,[1,2] and its performance directly affects the operation safety and quality of trains.[3]. The virtual braking environment will help engineers to get a better understanding of the influences that other subsystems (e.g. vehicle dynamics and electric braking) will have on the performance of the electropneumatic brake. The virtual braking environment consists of a three-car train model and six electropneumatic brakes model (each one for each bogie). In order to reduce the number of state variables of the model and the amount of simulation operations, this article takes into account vehicle dynamics of 3 degrees of freedom (vertical, longitudinal, and nodding). They are closely related to train braking process, and less relevant degrees of freedom (rolling, yawing, and lateral) are neglected during modeling.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
