Optimization Of Vertical Section Design For Atomated Hump

Along with railway's rapidly developing, the distribution of the marshalling stations on the railway network should be re-planed. As their key shunting equipment, hump design is the critical part firstly involved. It plays an important role in enhancing the hump's wagon stock disintegrating capacity, ensuring the shunting operation safety, reducing the project investment, cutting the railway operation costs, and promoting the comprehensive operational efficiency.Vertical section design of hump is a main task for the hump design. Therefore, this thesis takes the methods to reasonably design the whole hump vertical section as its research objective on the conditions of the point-continued speed control system with reducers and retarders. To do so, based on the conventional design theory and the existing research results, the thesis takes the deficiency of the conventional design method into account, uses the system science, optimization theory, and comprehensive evaluation techniques.(1) A multi-objective optimizing model for designing the hump pushing section has been established according to the results analyzing the operational characteristics, the construction and operation requirements to the section in order to maintain the higher hump disintegrating efficiency, to ensure the operation safety, to reduce the constructing costs. Furthermore, a Pareto solution set is obtained with NSGA-â…¡Multi-objective genetic algorithm.(2) A multi-objective optimizing model for designing the humping section has been established according to the results analyzing the operational characteristics of the section, the requirements for the car group's running to the different slope segments of the section, the requirements of the construction and operations, with its humping capacity, operational efficiency, costs and safety taken into account. Also, its Pareto solution set is achieved with the NSGA-â…¡Multi-objective genetic algorithm.(3) A multi-objective optimization model for designing the coupling section has been established according to the results analyzing the different characteristics between the coupling section and the humping section of hump, the requirements for the car group humping status to the section, with the operational efficiency it will have and the construction costs taken into account. Based on the characteristics of the model, the thesis puts forward a scheme comparison method on analyzing and calculating the candidate schemes on grade combination and slope length combination to select the best matched slope length proportion.(4) The effecting factors of two kinds of shunting accidents:over-speed coupling accidents, the rear-end collision and side collision accidents, are analyzed, and the Bayesian network models on the two accidents are established respectively in line with hump-system's characteristics and the merits of Bayesian network. Then with the inference rule of the Bayesian network model, the posterior probabilities of the main factors are obtained. Since the over-speed coupling is the common accidents, and more and more newly-built heavy-haul cars are put into operation, the thesis also puts one of its research emphases on the over-speed coupling caused by the heavy-loaded cars, and a Bayesian mixture network of common cause failures is set up to calculate and analyze the impact degree of the heavy-haul cars to the over-speed coupling accidents and the adaptability to the existing hump.