| Braking system performance of mine storage battery electric locomotive plays asignificant role in ensuring safe operation of electric locomotive and transportefficiency. The subject investigated of this study is the8t mine storage battery electriclocomotive of Xiangtan SHUANGMA Electric Co., Ltd. Modern design theory andmethods, mechanical system modeling and dynamic analysis methods, modern controltheory, fluid transmission and control theory were used synthetically. Meanwhile,mechanical behavior of mine storage battery electric locomotive, mechanics model ofhydraulic pressure braking system and brake shoe linkage robust optimization designmethod of mine storage battery electric locomotive which included in the rotation vicegap were analyzed overall. This paper studies the following tasks:(1) Braking process mechanical behavior of mine storage battery electriclocomotive was analyzed overall and mathematical model of braking process wasbuilt. Based on the describing on hand-wheel shoe brake braking process for mineelectric locomotive, the mechanical model between braking mechanical and pressurerelationship of brake shoe was founded. The insufficient braking force in electriclocomotive braking process, a long braking distance, the reason of brake shoeexcessive wear were analyzed deep-going. Bases on force conditions of whole vehicleunder braking condition, the mechanical model between braking drag acceleration andbraking distance was founded. And, braking time, braking distance and theoreticalvalue of brake shoe average pressure considering different working conditions ofmine storage battery electric locomotive were computed.(2) Mine storage battery electric locomotive hydraulic pressure braking systembased on energies collection was presented. Structure and braking characteristics ofmine storage battery electric locomotive were analyzed and a theory of electriclocomotive hydraulic pressure braking system was presented. After several energycollection ways were analyzed synthetically, this study choose hydraulic pressureenergies collection braking method. Electric locomotive hydraulic pressure brakingsystem was ascertained through analyzing structure and braking characteristics ofmine storage battery electric locomotive. The composing as well as working processof drawbars brake shoe braking device, hydraulic pressure energies collection device and hydraulic pressure servo control device were described.(3) Dynamics modeling and simulation analysis for hydraulic pressure brakingsystem of mine storage battery electric locomotive were presented through usingAME/Sim software. Hydraulic pressure energy conversion braking system model wasbuilt based on simulation platform of AME/Sim and the main parameters of systemwere designed. Electric locomotive speed, brake shoe average pressure, changeregulation of accumulator pressure with time were analyzed at the initial velocity of10km/h and15km/h based on different conditions for normal braking and emergencybraking of electric locomotive. Braking performance of4aspects, including brakingdistance, braking time, brake shoe pressures and energy collection using, were made acontrast based on simulation results. Compared with hand-wheel brake shoe method,hydraulic pressure braking time reduces by19%and28.9%and braking distancereduces by19.9%and33.1%under the condition of normal emergency brake. At thesame time, the pressure of the brake shoe on wheels raise4.8%and8.4%and recoveryrate of hydraulic pressure energy is9.7%.(4) Considering influence for processing errors of pole and revolute pair gap,robust design and optimization methods for hand-wheel shoe brake linkage of minestorage battery electric locomotive were presented. Firstly, the process of movementfor shoe brake linkage of electric locomotive was analyzed and kinematics model forshoe brake linkage was built, under ideal conditions. Then, kinematics model of shoebrake linkage for included in rotation vice model was built. Finally, the mean of brakeshoe braking distance error and standard deviation minimization as a goal based onrobust parameter design and optimization model of hand-wheel shoe brake linkage formine electric locomotive were built by institutional rod length as design variables,revolute pair gap, gap vice contact angle as well as processing errors of pole as noisefactors. And, robust design and optimization of parameters were adopted by usinggenetic algorithms and Monte Carlo simulation. So, these provide a theoretical basisfor improving effectively and enhancing braking performance of mine storage batteryelectric locomotive. |
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