铁路集装箱中心站集装箱流系统运作现状分析

铁路集装箱中心站是集装箱多式联运的重要中转枢纽,对铁路集装箱中心站及其物流系统运作的研究具有重要的实际指导意义。阐述铁路集装箱中心站组成部分、集装箱物流的概念和集装箱物流系统运作问题的分层分解框架;对港口和铁路集装箱枢纽集装箱流的研究现状进行详细分析,探讨今后的研究方向,为铁路集装箱中心站的建设和运作提供参考。     

Application of interval Multi-attribute Decision-Making Method to Aeroengine Performance Ranking

Introduction The performance deterioration of aeroengine isone of the key factors which may induce aircraft cata-strophic events. With the expansion of airline fleets,the number of aeroengines increase dramatically.Because performance parameters can refle…     

铁路集装箱中心站大门系统优化设计

根据铁路集装箱中心站大门口卡车到达和接受服务的不确定性特性,将传统的排队系统与模糊集理论结合,提出基于模糊排队模型的集装箱中心站大门优化设计方法,并通过算例验证该方法的可行性和有效性,从而说明排队理论可以扩展到模糊领域,使其更具有现实意义.     

提高内燃机车牵引齿轮啮合质量,延长牵引从动齿轮使用寿命

分析了内燃机车牵引齿轮磨耗的情况,提出了对磨耗后的牵引齿轮进行磨削的建议,给出了理论计算值。     

Strategy-Based Forecasting Model for Civil Airlines

Airlines usually pay more attention tO maintenance cost for efficiency improvement and consumption reduction．However，airlines，especially the domestic airlines，Can hardly predict the cost exactly due to the uncertainty and complexity until now．In practice，the cost is calculated by collecting and calculating the invoices afterwards．To settle the problem，a maintenance cost forecasting model is proposed in this paper．Maintenance activities are classified into scheduled maintenance and unscheduled maintenance．Scheduled maintenance is periodic，in which the required materials and man-power hours can be obtained properly in advance．Nevertheless，it is impossible to acquire the necessary in formation of unscheduled maintenance．According to the specific characteristics of each，Activity-Based Costing(ABC)and Cost Estimating Relationships(CERs)are introduced to attack the building of forecasting models，respectively．Then practical cases，the 3C check of MD-90 and the engine shop visit are adopted tO verify the cost forecasting models proposed．The results show that the models not only can predict the actual maintenance cost successfully，but also are helpful tO drawing up the maintenance program and managing the maintenance funds efficiently．     

民用飞机维修成本评估

近年来，航空公司的经营状况持续低迷，为解决这一现实问题，从民用飞机维修成本入手，提出了对民用飞机进行经济性评估的方案和策略，介绍了用于民用飞机维修成本经济性评估的方法、步骤以及参数化建模的数学工具，最后以发动机本体送修为例，运用介绍的理论作了实例分析。实证表明，对民用飞机的维修成本进行合理的评估，对改善航空公司经营状况是非常必要和有益的。