Modeling the evolutions of day‐to‐day route choice and year‐to‐year ATIS adoption with stochastic user equilibrium

Suppose that in an urban transportation network there is a specific advanced traveler information system (ATIS) which acts for reducing the drivers' travel time uncertainty through provision of pre‐trip route information. Because of the imperfect information provided, some travelers are not in compliance with the ATIS advice although equipped with the device. We thus divide all travelers into three groups, one group unequipped with ATIS, another group equipped and in compliance with ATIS advice and the third group equipped but without compliance with the advice. Each traveler makes route choice in a logit‐based manner and a stochastic user equilibrium with multiple user classes is reached for every day. In this paper, we propose a model to investigate the evolutions of daily path travel time, daily ATIS compliance rate and yearly ATIS adoption, in which the equilibrium for every day's route choice is kept. The stability of the evolution model is initially analyzed. Numerical results obtained from a test network are presented for demonstrating the model's ability in depicting the day‐to‐day and year‐to‐year evolutions.     

PDM系统在亚星的实施和应用

着重讨论PDM系统在亚星实施的目的、过程、作用以及应用的效果,总结实施和应用过程中的经验.     

我国实施利率市场化改革的必要性和途径

对我国实施利率市场化改革的必要性以及进行利率市场化改革存在的问题进行了分析,并相应提出了解决问题的对策。     

我国货运行业综合指数模型研究

为了掌握货运行业的运行发展态势,及时发现行业及区域发展不协调等短板和问题,从而为制定货运行业可持续协调发展政策以及为调整优化我国货运结构以适应经济高质量发展提供科学的决策依据,研究提出了货运行业综合指数这一概念及其计算模型。基于我国货运行业2008—2017年的历史数据,运用熵值法和因子分析法计算指标权重并进行比选,得到全国货运行业及东部、中部、西部和东北四大经济区货运行业基础设施、资源投入和运输产出3类运输指数。研究发现,2008—2017年综合货运指数总体呈增长趋势,但随着我国经济发展进入新常态,基础设施指数、资源投入指数在2014—2016年增速放缓,运输产出指数呈现下降趋势;运输产出指数的波动领先于国内生产总值（Gross Domestic Product, GDP）4个季度,表明我国货运行业综合指数与GDP具有时差相关关系。     

优化产品设计对降低整车工厂人工成本的影响研究

文章从整车工厂人工成本的定义和组成出发,论述了影响整车工厂人工成本的因素,并分析了目前的优化方式,即传统精益生产方式的优点及不足之处。着重阐述早期产品设计优化对提升整车工厂制造效率、降低人工成本的益处和优化方法。     

军选民用车驾驶室的开发设计

军用汽车是指列入军队装备体制的各种类型汽车的总称。以其与民车融合的程度划分,大致分为专研军用、军选民用等。文章重点对军选民用重型卡车的开发进行简述。军选民用车型,是依托民用汽车平台进行开发,以满足军队装备需求。在开发的过程中需重点解决如下问题:整车技术参数、环境适应性、铁路运输等指标是否满足军用指标要求。     

人性化设计在机械产品设计中的应用

现代社会中的人们对于工业产品的要求不仅仅停留在其基本功能的实现,更加注重产品设计中涉及到的人性化设计问题。因此对产品设计中人性化设计的研究不仅具有理论意义,还具有十分重要的指导意义。文章就"人性化设计"及其在机械产品设计中的应用进行分析和探讨。     

Projecting adoption of truck powertrain technologies and CO2 emissions in line-haul networks

In this paper we present a mixed-integer linear program to represent the decision-making process for heterogeneous fleets selecting vehicles and allocating them on freight delivery routes to minimize total cost of ownership. This formulation is implemented to project alternative powertrain technology adoption and utilization trends for a set of line-haul fleets operating on a regional network. Alternative powertrain technologies include compressed (CNG) and liquefied natural gas (LNG) engines, hybrid electric diesel, battery electric (BE), and hydrogen fuel cell (HFC). Future policies, economic factors, and availability of fueling and charging infrastructure are input assumptions to the proposed modeling framework. Powertrain technology adoption, vehicle utilization, and resulting CO₂ emissions predictions for a hypothetical, representative regional highway network are illustrated. A design of experiments (DOE) is used to quantify sensitivity of adoption outcomes to variation in vehicle performance parameters, fuel costs, economic incentives, and fueling and charging infrastructure considerations. Three mixed-adoption scenarios, including BE, HFC, and CNG vehicle market penetration, are identified by the DOE study that demonstrate the potential to reduce cumulative CO₂ emissions by more than 25% throughout the period of study.     

冲压件品质控制

在整车开发过程中,整车外观品质至关重要,因其决定顾客对整车的第一感官印象,而冲压件品质直接决定整车外观品质,因此对冲压件品质有较高的要求。冲压件品质主要受产品设计和过程工艺设计2个阶段影响,文章主要从产品设计和过程工艺设计2个方面阐述了影响冲压件品质的一些注意事项及控制方法,指出冲压件品质直接影响整车白车身品质,冲压件从设计到量产任何一道工序都不能疏忽。     

海外KD出口项目分析

随着国内汽车企业竞争日益激烈,海外KD（k,reekeddown）出口作为企业经济增长点变得尤为重要．文章系统地从海外KD出口项目市场的考察、出口合作方的选择、产品认证、生产准备、KD出口包装以及试生产和量产初期阶段进行了比较全面的描述,为今后企业海外KD项目出口提供指导。