Abstract
The dynamic characteristic of pneumatic brake system is very important, so the full-parameter model of the pneumatic brake system was established on the base of the technology of computer simulation. Its key brake components include brake valve, relay valve, diaphragm brake chamber and pneumatic circuit. AMESim was first introduced on the basis of mathematical derivation. So the multivariable complexity derivation, nonlinear mathematical relationship can be avoided. The model can be used for the bus brake system multi-parameter simulation and design. A pneumatic brake system test-bed was designed to verify the accuracy of the model. It can measure the dynamic characteristic and the output response coordination of each component. It was showed that the simulation results were fit to the experiment results. For the deviation, the explanation and analysis were also given. The response hysteresis of the brake system is mainly caused by the rubber diaphragm deformation in brake chamber. This research laid the foundation for the further structural optimization of brake components and fitness analysis of the pneumatic brake system.
Highlights
Pneumatic brake system has the advantages of simple structure, large braking force, none recycling of working medium
The bond graph model was established by Chen Yan et al [3] of Ludong University which includes dual-chamber brake valve, pneumatic circuit, chamber, emergence relay valve and gas flow in pipe
The brake response time is from the pneumatic brake valve feeling pedal force to brake chamber outputting required work pressure; Brake rescission time is from the pedal force disappearing to the compressed air in brake chamber excluding out
Summary
Pneumatic brake system has the advantages of simple structure, large braking force, none recycling of working medium. The study on dynamic response characteristics for braking systems is necessary. Et al Li He [4] from Huazhong University of Science and Technology modeled and simulated the key components and the whole pneumatic brake system with MWorks. The relationship between pedal force and pressure in the chamber, and the dynamic response of systems were analyzed. Texas A&M University [5] in USA modeled the pneumatic subsystem of a drum air brake system and proved the dynamic response of the model is good. Multidisciplinary modeling software AMESim is introduced to complete the internal key components of pneumatic brake system modeling. It can use graphic modeling method based on physical model to avoid complex mathematical relationships derivation
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