Dynamic Performance Optimization Of Variant Projects In Railway-line Design

Railway line design is the most basic and core work, and it is the overall work of the relationship. The quality of variant projects in railway-line design has direct influence on safety of train operation, circuit stability and passenger comfort. In the design of traditional railway, the design parameters are often identified by adopting the method of static or quasi-static. The method has insufficient attention to the interaction between the lines and the vehicles, and can not guarantee dynamic performance of the scheme, which may lead to that defect of dynamics performance of design scheme can not be discovered and improved in time, but once the line is built and the defect is found later, it is difficult to eliminate. Therefore, based on the method of theoretical analysis and simulation, optimizes dynamics of design scheme for a section of railway lines, and the major work is as follows:(1) Comparison and selection the railway line-design which is from the economic point, as the preliminary railway-line, which takes the design scheme of a section of railway line as the optimization object.Based on the theory of vehicle-track dynamics, combined with the evaluation system of vehicle-track dynamic performance, determines evaluation index of dynamic performance from the security, stability and wheel rail force, three aspects, and establishes the dynamic model of the vehicle-line in the selection line, analyzes dynamics performance of line, determines the key optimized region.(2) Combined with the relevant specifications of railway and the actual conditions of railway, such as curve radius, length of transition curve, vertical curve radius, the minimum length of clip straight line and circular curve, and flat and vertical curve overlapping lines. Dynamic simulation is used the to analyze the situation that under the condition of other parameters are unchanged, analyzes the rules that design parameters of the transmission line have influences on the dynamics performance of vehicle-track, thus obtaining the sensitive parameters of dynamics performance.(3) Based on sensitivity analysis of design parameters, using the analytic hierarchy process, combined with the optimization principle of circuit design. According to the analysis, it can be obtained the initial evaluation index value, which quantifies the evaluation index of dynamics performance, and constructs the evaluation system of dynamic performance of the circuit design scheme, and achieves comprehensive score of dynamic performance of the circuit design scheme.(4) Combined with optimized principle of circuit design, sensitivity analysis of circuit design parameters and actual situation of optimization of regional circuit, puts forward optimized design scheme that makes appropriate optimization line sensitive parameters of dynamic impact, and achieves the optimization method of dynamics performance of design scheme for a section of railway lines, and obtains optimization plan of the overall dynamic performance line system.The dynamic performance optimization method of variant projects in railway-line design is proposed in this paper. In the premise of satisfying the specifications of line design, it can be obtained optimization plan of the overall dynamics performance line system effectively, which can provide reference for optimization design of dynamic performance of high speed railway line scheme in the future.