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| Scheme evaluation on railway location design in mountains based on cloud model |
| LUO Yuan1， YAO Ling-kan1,2,3 |
1.School of Civil Engineering， Southwest Jiaotong University， Chengdu 610031， China;
2.MOE Key Laboratory of High-speed Railway Engineering， Chengdu 610031， China;
3.Road and Railway Engineering Research Institute， Sichuan Key Laboratory of
Seismic Engineering and Technology， Chengdu 610031， China |
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Abstract The scheme evaluation of mountain railway location design has the characteristic that it has many qualitative indexes. The traditional evaluation methods have not fully taken the uncertainty characteristics of qualitative indexes into account, and it also lacks of appropriate evaluation methods when qualitative indicators and quantitative indicators cross with each other. Firstly, the advantages of the cloud model in describing uncertain information were used to improve the traditional AHP. Combined with deviation method, the subjective weight and objective weight of index were calculated respectively. Through a new weighted fusion mode, the combination weight was formed. Then, according to the principle of uncertain reasoning of cloud model, an effective quantification of qualitative indexes was achieved by using the cloud generator based on the evaluation about qualitative index made by experts using linguistic variables. Finally, the projection method was introduced to select the optimal scheme. Therefore, a new model of comprehensive scheme evaluation which contained both quantitative and qualitative indexes was proposed, and an example of local alignment scheme comparison was used to illustrate its feasibility and practicability. It provides a new idea and method for the scheme evaluation of railway location design in mountains.
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Received: 23 March 2015
Published: 28 August 2015
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基于云模型的山区铁路选线设计方案评价模型
山区铁路选线方案评价具有定性指标多的特点，传统铁路方案评价方法未考虑到定性指标中不确定性因素的影响，并且当定性指标与定量指标出现交叉时，缺乏相应的评价方法.首先利用云模型弥补了传统层次分析法在确定主观权重时对专家意见的不确定性考虑不足的缺点；再通过构建一种新的权重融合模式来计算指标的组合权重，以使指标权重达到主、客观统一；然后根据云模型的不确定性推理原理，在专家采用语言变量对定性指标进行评价的基础上，通过使用云发生器实现定性指标的有效量化; 最后引入投影法进行方案优选.建立了综合考虑定量及定性指标的山区铁路选线方案评价模型，并通过一个原则方案的比选实例说明了模型的可行性和实用性.该研究为山区铁路选线设计的线路方案定性、定量综合评价提供了新的思路和手段.
关键词：
山区铁路,
方案评价,
云模型,
层次分析法,
权重
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