1、 Study on Layout Optimization of Passenger Station based on Multi-objective Planning AbstractThis paper study on the optimal layout of passenger station and the basic principle of selection location. There are both quantitative index and qualitative index existing in the evaluation indexes of the la
2、yout of passenger station. To unify the evaluation indexes, this paper establishes a multi-objective planning optimization model of the layout of passenger station, by using the basic idea of multi-objective planning and introducing the effect of targets of the evaluation indexes. In Nanning railway
3、 terminal for example, four evaluation indexes: construction investment、operation cost in railway terminal、 cost of passenger trip and the other social benefits are determined. Calculate respectively all effect of targets of the evaluation indexes and then determine the optimal scheme of the layout
4、of passenger station in Nanning railway hub by the total effect of targets after being weighted. Keywords-component； multi-objective； passenger station； Layout Optimization In the past, paying much attention to improving line carrying capacity and neglecting the carrying capacity of hubs or stations
5、 in China leaded to the shortage of passenger capacity and the difficulty in meeting the demand of transport market. At present, China is in the primary stage of high-speed railway construction. High-speed railway being introduced into existing railway terminal will break the transport pattern of ex
6、isting railway hub and will dramatically change the original railway hub transportation structure、 transportation operation mode and transportation path. It is an important question in railway terminal planning to reasonably determine the locations and the number of the high-speed passenger stations
7、 in hub and optimize the layout of passenger stations in terminal. I Layout Optimization model of Passenger Station in railway hub A. Layout of passenger station in railway hub and basic principle of selection location （ 1） For human-oriented, make the trip distance and time of passenger from the st
8、arting point to passenger station shortest、 the travel cost lowest、 the riding most convenient and reduce the passenger transfer or make it more convenient. (Including the transfer between one or multiple transport modes) （ 2） Take the market as the direction and make the benefits as the center. Pas
9、senger station in city is kind of large infrastructure. Inputs and outputs should be the standard of the evaluation of railway operation benefit. At the same time, removal expense which is relative to the selection location of passenger station、 investment of civil engineering、 completion time of pr
10、oject and some cost related to project should be brought into the constraint condition of selection location of passenger station. It still needs to compare the operating costs of different schemes of selection location of passenger station. （ 3） The development of city should be combined with the c
11、ity planning. It includes urban master planning、 urban public transport planning、 urban rail transit network planning and so on. Their evaluation indexes are different. In a word, it should reflect the compatibility between railway station and the city, and guide and advance the development of the t
12、ransportation of the city. 3 On above foundation of all basic principles, alternatives should be in accordance with the natural distributed discipline of passenger flow, and be beneficial to hub passenger train. They also should make full use of the railway existing equipment and the urban existing
13、collecting and distributing centre. At the same time, they should have both good geological conditions and economic environment. B. Layout Optimization model of Passenger Station in railway hub The economic evaluation indexes of layout optimization model of passenger station in railway hub have both
14、 quantitative indexes such as engineering investment、operating costs and so on and some qualitative indexes which cant be quantified directly such as cooperation with the development planning of city、 environment protection and so on. To be convenient to unify quantitative indexes and qualitative in
15、dexes, establish layout optimization model of passenger station below by applying the theory and method of multi-objective planning. 1m ax I iiif w f （ 1） In formula: i Quantitative indexes and qualitative indexes of all design schemes. I evaluation indexes in all； if Effect of targets of all evalua
16、tion indexes（ 01if） . It is introduced for be convenient to unify the dimension of quantitative and qualitative indexes. For the effect of targets of quantitative indexes, determine the corresponding value of zero and one, and then evaluate the value through insertion method. For the qualitative ind
17、exes, use the six-degree standard to quantify: Best1、 Better0.8、 General0.6、bad0.4、 worse0.2、 worst0. iw Weight of all evaluation indexes. It can be confirmed by the means of investigation and argumentation and experts. In addition, 11I iiw . f Total effect of targets of all design schemes. Its valu
18、e determines the final good or bad ranking of all design schemes. II Construction scheme of passenger station in Nanning railway hub A. Present situation and future planning of Nanning railway hub Nanning railway hub is the important regional terminal in southwest railway network. At present, it is
19、connected with three railway main lines: Hunan-Guilin line、Nanning-Kunming line and Nanning-Fangchenggang line. The constructing line: Liuzhou-Nanning passenger dedicated line、 Nanning-Litang railway、 Yunnan-Guilin railway and Nanning-Qinzhou railway all introduced into Nanning hub. Recently, there
20、will be Jinchengjiang-Nanning railway、 Naning-Pingxiang railway and so on introduced into Nanning terminal. At that time, the number of intersection railway lines will be nine in Nanning hub. In terminal , therere only one passenger stationNanning Station. It has five receiving-departure lines for p
21、assenger trains (including main line)、 one freight through line、 four receiving-departure concurrently storage sidings、 four shunting lines. The population of Nanning in downtown is planning to be 69 million in 2010 and 78 million in 2020. The population of the center is planning to be below 21 mill
22、ion in 2010 and below 29 million in 2020. The existing layout of railway terminal is in loop mode. Affected by geological condition and features、 the limit of removal working, existing passenger station cant be reconstructed in large scale. All of passenger working being concentrated in a station leads large pressure to city traffic. Therefore, the layout mode should be that
