优化城际铁路客运需求总量预测

城际铁路客运需求预测利用人口、GDP与区域客运需求的相关性建立回归模型分析,却忽略了由于个人收入分配差异产生对客运需求影响。从收入分配差异性引起的客流变化角度分析,对人口因变量和GDP因变量进行修正,优化城际铁路客运需求总量预测。     

多编组铰接式胶轮电车结构分析和试验

文章详细介绍了多编组铰接式胶轮电车的系统架构组成及主要技术参数,分析了车辆的运动学关系,利用MSC ADAMS动力学软件分析车辆最小半径曲线通过情况。样车试验结果表明,确认设计及计算结构满足车辆运行需求。     

轨道车辆几何曲线通过计算参数化图解法研究

为了提高轨道车辆几何曲线通过计算的精度和效率,基于轨道车辆几何曲线通过计算原理,提出了一种基于尺寸驱动的轨道车辆几何曲线通过计算参数化图解法,利用在Solidworks平台下的尺寸驱动特性和方程式功能建立了B0-B0轴式轨道车辆几何曲线通过计算模板,并进行了实例验证,确定了给定参数下的车体与转向架最大夹角,车体相应点的最大道心距。     

地铁直线电机车辆曲线通过仿真

为了研究地铁直线电机车辆的曲线通过性能,建立了直线感应电机的电磁力学模型,在此基础上建立了地铁直线电机车辆机电耦合系统动力学模型,并将其与传统地铁车辆的动车和拖车进行对比研究.仿真结果表明:所建立的直线电机力学模型,可以满足动力学仿真的实时性要求;线路参数和行车速度与车辆曲线通过动力特性密切相关;地铁直线电机车辆和传统...     

Mn—B系空冷贝氏体钢转变动力学及组织研究

研究了连续空冷冷却速度、等温温度对新型中高碳Mn－B系贝氏体钢组织的影响规律，测试了其连续空冷及等温转变（CCT及TTT）整体动力学曲线。与TTT曲线相比，CCT高温珠光体转变曲线明显右移，而中温贝氏体转变及低温马氏体转变曲线位置几乎不变。此外，观察了不同冷却系条件及等温温度下，试验合金的金相组织。结果表明，试验合金具有优良的淬透性，在空冷条件下可获得贝氏体和马氏体复相组织。     

Using bi-level programming to analyze the royalty for private–public partnership projects: the operational quantity-based model

Abstract

This paper develops a royalty negotiation model based on the operating quantity of Build, Operate, and Transfer (BOT) projects for both government and the private sector using a bi-level programming (BLP) approach. The royalty negotiation is one of many critical negotiation items of a concession contract. This study develops a royalty negotiation model to simulate the negotiation behavior of two parties, and derives the heuristic algorithm for the BLP problem. A number of factors are incorporated into this algorithm including the concession rate, the time value discount rate, the learning rate, and the number of negotiations. The paper includes a case study of the Taipei Port Container Logistic BOT Project. The results show that the two parties involved completed royalty negotiation at the sixth negotiation stage. The findings show that the government can receive a royalty from the concessionaire, calculated at 0.00386% of the operating quantity of this BOT project. Therefore, the royalty negotiation model developed here could be employed to explain negotiation behavior.     

橡胶轮转向架车辆动态曲线通过行为研究

橡胶轮转向架在曲线通过方式上,与钢轮转向架有很大不同。在橡胶轮转向架稳态曲线通过行为研究的基础上,本文着重研究了橡胶轮转向架车辆的动态曲线通过行为。计算分析表明:橡胶轮转向架车辆在导轮横向力、轮重减载率和轮胎磨耗等方面具有优良的曲线通过性能。     

SS3型电力机车动力曲线通过

对ＳＳ３型电力机车动力曲线通过进行了分析法计算和图解法求解，分析法与图解法相比，第一轴的轮缘力Ｆ１相差０．６％之内，第三轴的轮缘为Ｆ３相差０．３％之内，但图解法计算更简捷，直观，因此，建议在机车，车辆的设计时，对机车车辆动力曲线通过的计算尽量采用图解法。     

Competitive tendering versus performance-based negotiation in Swiss public transport

The purpose of this study is to assess differences in the levels of cost efficiency of bus lines operated under competitively tendered contracts and performance-based negotiated contracts. Following the revision of the Swiss railways act in 1996, regional public authorities were given the choice between two different contractual regimes to procure public passenger transport services. We directly compare the impact of competitive tendering and performance-based negotiation by applying a stochastic frontier analysis to the complete dataset of bus lines (n = 630) operated by the main Swiss company (Swiss Post) at the same time (in 2009) throughout the country. The overall results show that the differences in the levels of cost efficiency between the two contractual regimes are not significant. Our findings are in line with recent evidence of cost convergence between competitive tendering and performance-based negotiation, and suggest that the practice of using both contractual regimes is challenging for the operators in terms of competitive pressure. The threat of competitive tendering may have a disciplining effect on negotiation since it prevents bus companies from bargaining inadequate rents and inducing asymmetric information advantages.     

一种新型机车车辆曲线运行模拟试验台研制方案

提出了一种新型机车车辆曲线运行模拟试验台研制方案。该试验台可以模拟单车和两连挂机车车辆通过曲线时的状态。