某前置后驱乘用车传动系扭振模态理论计算及试验测试

针对某前置后驱乘用车在一定发动机转速范围内产生车内轰鸣声的现象,建立了该车传动系统的扭振理论计算模型,获取了传动系统的扭振模态信息。进行了该车传动系统扭振强迫振动计算分析与扭振测试,验证了理论计算的准确性,并明确了该车低速轰鸣声是由传动系统扭振导致,进而可采取相关措施降低扭振幅值,避免低速车内轰鸣声产生。     

铁路空车调配问题的区间线性规划模型及算法

铁路空车调配问题是合理解决空车需求与供应之间的不平衡问题。在借鉴空车调配问题模型已有成果的基础上,围绕空车供应与需求量的不确定性、空车调配的时效性、路段通过能力的限制性3个方面,对区间数运用于空车调配问题加以适应性分析,以空车总走行公里最少和到达时间满足空车需求限定时间可信度加权和最大为目标,提出利用线性区间规划理论解决空车调配问题的模型和算法,并结合算例验证了区间规划的灵活性和简便性,使得空车调整模型符合运输生产实际并具有普遍意义,该模型的采用对路网上空车调整问题将起到很好的借鉴作用。     

基于品牌形象的汽车造型研究

通过史论研究方法分析当代汽车造型的潮流和未来趋势;通过个案调查法研究当代国外知名汽车品牌的发展历程,阐述由品牌文化决定的品牌形象在汽车造型设计中发挥的重要作用。归纳总结出品牌策略在汽车造型设计中的实施方法。     

专车服务与出租汽车市场的法律规制

多地监管部门针对专车服务所进行的黑车式查处使得中国刚刚兴起的专车服务面临困境,是否应鼓励专车服务成为时下的热点话题。为解决专车服务在中国出租汽车市场所遭遇的身份尴尬问题,综合考虑出租汽车服务的准公共性、专车服务的现实需要以及合规性等因素展开探讨。指出尽管专车服务存在不符合法规的现象,但在中国却拥有广阔的市场发展前景。进而提出对待专车服务所采取的正确措施应该是:通过完善法律法规、适度放松数量管制、适度放松价格管制、加强质量与安全管制等措施,引导、规范不符合法规的专车服务行为,实现专车服务市场的规范化。     

Determination of the transportable moisture limit of iron ore fines for the prevention of liquefaction in bulk carriers

In 2013, over 500 million metric tons of Iron Ore Fines (IOF) were transported around the world using bulk carriers. Under certain conditions IOF, while being transported, can possibly undergo liquefaction. Since 2006, there has been eight reported bulk carrier casualties possibly caused by the liquefaction of IOF. The objective of this study is to evaluate, compare and verify the limitations and relevance of the Proctor/Fagerberg, Flow Table and Penetration test methods that are used to determine the Transportable Moisture Limit (TML) of IOF. The TML is the maximum gross water content that bulk cargoes, including IOF, may contain while being transported at sea without being at risk of liquefying. A thorough literature review, along with laboratory research, was carried out to compare the TML results from the three leading test methods to determine whether they produce reliable results when testing IOF. The study concludes that the three test methods, as stated in the 2012 International Maritime Solid Bulk Cargoes Code, are unverified and therefore not appropriate for testing IOF. This is due to the variation in the results produced by the three test methods and also due to the difference in the physical properties of IOF when compared with the materials that were originally intended for testing. It is noted that the TML alone may not control the potential liquefaction of IOF and further studies, regarding the physical properties and system variables, which cause the material to liquefy, are required to determine the liquefaction potential of IOF.     

四车多功能翻车机的卸车工艺系统

介绍国内外煤炭港口翻车机系统的基本情况和发展趋势,结合四车翻车机工程实际,阐述大型多功能翻车机卸车工艺系统的设计研究过程,及研制出的一种能够在一个翻卸循环中接卸4节敞车车皮、并满足4种车型(C64型摘钩车、C70A和C80型旋转钩车、KM80型底开门车)的大型多功能翻车机系统。该系统满足日益增加的煤炭产量以及翻车机系统向大型化、高效化、环保化、多功能化方向发展的需求。     

船载液化矿粉晃荡特性的数值仿真与实验研究

近年来,以镍矿粉为代表的易流态化货物在海上运输中由于矿粉随船舶持续晃荡形成液化流动导致沉船的事故时有发生。本文首先基于常见船舱结构尺寸建立三维船载液化矿粉数值模型,然后利用高性能计算机和CFD软件Fluent模拟分析数个周期内矿粉随船舱横摇时的运动变化规律,并对更长时间内矿粉货物受晃荡影响产生单侧堆积现象加剧趋势进行模拟分析。此外,通过室内小比例模型进一步考察研究液化矿粉晃荡的形成过程,并通过实验数据和对应小比例数值模型计算结果的对比,对研究手段和数据的准确性进行相互验证。研究结果旨在为矿粉货物的远洋运输安全和相关沉船成因分析提供依据和参考。     

载重80t不锈钢及全钢运煤敞车的研制

为适应铁路快速发展战略的要求，提高铁路货车的运煤能力，株洲车辆厂研制了载重80t不锈钢及全钢运煤敞车。现介绍这种新型运煤敞车的技术参数及尺寸、基本结构、研制过程及其效益分析。     

Car driving at the limit by adaptive linear optimal preview control

The paper is concerned with modelling car drivers. The context of the work presented is explained. Then, previous research on the application of optimal linear preview control theory to driving road vehicles with only modest excursions from a straight-running equilibrium state is extended into the general large-lateral-motion arena. Optimal controls are found for steady-cornering trim states of an exemplary car at a given speed as a function of cornering effort, up to the practical limit. The manner in which the optimal controls change as the cornering vigour changes is discussed. Simulations of the virtual driver-controlled car are shown to demonstrate the closed-loop system following lateral path demands and the advantages of employing gain-scheduled adaptive control over a fixed-control scheme are demonstrated.