A Study On The Switching And Its Controlling Of The Switch And Nose Rails In High-Speed Turnout

In recent years, railway speed increasing, construction of passenger dedicated line and jinghu high-speed railway indicate that China railway will completely enter into a new stage of high-speed. High-speed turnout, which is a key equipment of high-speed railway, reaches the highest speed of 350km/h. To make sure of the stability, comfort and safety, problems in high-speed turnout domestic studying such as design, manufacture and maintenance are urgent problem waiting to be solved effectively. In this thesis, switching and controlling of the movable switch and nose rails which are the key technology and difficulty in design and using stage was comprehensive studied, including mechanical model, calculation method and program. The switching and controlling theory was used in structural design analysis of high-speed turnout, and provided theoretical basis for switching design of No.18 and No.42 turnouts of the passenger dedicated line. In addition, the effect on turnout dynamic respond induced by switching irregularity has been analyzed. Thesis research work is as follows:(1)Based on the summarization and analysis of home and abroad high-speed turnout technical features, switching and turnout dynamics research status, according to switching controlling problem of switch rail and nose rail which are long and large in high-speed turnout, a research thinking has been proposed, which regards the whole turnout as research object, based on finite element method , takes reducing switching force, scant displacement and turnout dynamic respond index as the goal.(2)According to analysis of special structure of the switch and nose rails, nonlinear regression method is proposed to simulate section property by quadratic polynomial. It solved the problem of modeling and calculate induced by complicated section with nonlinear area and moments of inertia. Simulating the switch and nose rails using section nonlinear beam element is realized, and corresponding beam element stiffness matrix is set up. It provides good bases for simulating switching of the switch and nose rails.(3)Considering turnout system structure characteristic, mechanics feature and switching mechanism, an analysis model of turnout switching is set up. To simulate some factors such as fastener, slide baseplate friction, block and close effect, a switching simulation program is written. Dynamic simulation for switching of the switch and nose rails is realized, and the switching simulation program is verified.(4)Switching simulation program has been used in preliminary design of switch rail switching in No.18 and No.42 turnouts of the passenger dedicated line. The factors that effect switching force and scant displacement such as traction points lay and motion, switching time were analyzed. The switching mode has been optimized, reasonable suggestions and structure parameters have been put forward for design and test.(5)Switching simulation program has been used in preliminary design of nose rail switching in No. 18 and No.42 turnouts of the passenger dedicated line. The effects induced by the factors such as nose rail structure, movable part length, fastener state, traction motion, switching time, clip stuff were analyzed. Switching design was optimized through the feedback of test and theoretical calculation.(6)The modes of one switcher for multipoint traction and its principle were summarized and analyzed, and calculating method of the switcher electric power force was set up. The switching of this traction mode was calculated by taking Cogifer No.18 and No.41 high-speed turnout of France as examples. Two modes of one switcher for multipoint traction and multiswitcher for multipoint traction of high-speed turnout were compared detailed, and reasonable suggestions have been put forward.(7)Considering wheel/rail contact character, linear and nonlinear factor of turnout structure, the vehicle-turnout coupling calculation model was set up to calculate the dynamic response during train passing through main line and branch line under ideal state and the state with scant displacement or clip stuff. The dynamics indexes such as flange force, train's hunting motion, the reduction rate of wheel load, derailment coefficient were compared.The author established comparatively perfect switching controlling theory system. The calculating model, method and program are correct, and the results of switching simulation program are credible. No.18 and No.42 turnouts of the passenger dedicated line been developed and produced shows that the thesis works have important guiding significance to structure design of high-speed turnout.