一体化运营的钦州自动化码头海铁联运发展

针对多式联运建设过程中铁路与港口最后1 km迟迟不能打通的问题,以钦州港自动化码头海铁联运为实践案例,分析了海铁联运现状和推进过程中数据不通、运输规则不同等困难。基于海运与铁路2套不同的运行机制特点,采用实证研究法和个案研究法,提出先实现物理区域合并、堆场资源共享,再打破信息壁垒、实现信息系统融合,最终实现统一调度、业务融合的一体化运营的分步式推进路径。研究成果可为其他港口海铁联运建设提供借鉴。     

海上风电场建设与海洋工程装备研发中若干水动力学关键技术问题

结合近年来在与海洋资源开发相关的水动力学方面开展的研究工作和对国内外研究进展的认识,以及海上风电设备研制和风电场的建设,就海洋工程装备研发中水动力学关键技术及其可能的发展方向作了简要的评述,以期引起有关方面对海洋工程装备研发中的关键技术研究的重视。     

配置极点的约束方差设计方法

在随机控制问题中,性能指标表现为系统的状态方差或其上界形式,本文讨论如何使闭环系统满足给定状态方差约束,且具有预期间环极点的线性反馈控制器的设计方法,算例说明该方法简单有效。     

系统仿真转移矩阵法的另一类算法

本文利用增广矩阵法的一些结果,将数值逼近原理运用于线性定常系统的数字仿真中,给出了 转移矩阵法的另一类算法。此类算法精度较高,计算量较小,且便于应用。      

Experimental modeling of controlled suspension vehicles from onboard sensors

In this article, identification of vertical dynamics of vehicles with controlled suspensions is considered. Identification is performed from experimental data measured on a four-poster bench test of a segment C car, equipped with a CDC-Skyhook dampers control system. The measurements are obtained from the onboard accelerometers needed by the control system. A nonlinear model in regression form is identified, having the road profile and damper control currents as inputs and chassis accelerations as outputs. The model is identified by means of a set membership structured identification method, which takes advantage of physical information on the structure of the system, decomposing the system into three subsystems: one represents the chassis and engine and the other two represent the overall behavior of front and rear suspensions, wheels and tires. This decomposition allows us to avoid the complexity accuracy problems derived from the high dimension of required regression space. Indeed, the overall high-dimensional identification problem is reduced to the identification of lower dimensional subsystems and to the estimation of their interactions. An iterative scheme is used for solving the decomposed identification problem. As the chassis pitch is small for the usual road profiles, the chassis-engine block is considered linear and standard linear methods are used for its identification. The other two subsystems are the main sources of nonlinearities in the system, mainly due to the significant nonlinearities of controlled dampers and of tires. Owing to the complexity/accuracy problems of a physical modeling of these subsystems, an input-output approach is taken. In particular, a nonlinear set membership method that does not require the search of the functional form of involved nonlinearities is used for the identification of these subsystems. The iterative algorithm converged in two iterations to a model providing a quite satisfactory simulation accuracy for all the considered road profiles and CDC-Skyhook settings.     

Optimisation of active suspension control inputs for improved performance of active safety systems

A collocation-type control variable optimisation method is used to investigate the extent to which the fully active suspension (FAS) can be applied to improve the vehicle electronic stability control (ESC) performance and reduce the braking distance. First, the optimisation approach is applied to the scenario of vehicle stabilisation during the sine-with-dwell manoeuvre. The results are used to provide insights into different FAS control mechanisms for vehicle performance improvements related to responsiveness and yaw rate error reduction indices. The FAS control performance is compared to performances of the standard ESC system, optimal active brake system and combined FAS and ESC configuration. Second, the optimisation approach is employed to the task of FAS-based braking distance reduction for straight-line vehicle motion. Here, the scenarios of uniform and longitudinally or laterally non-uniform tyre–road friction coefficient are considered. The influences of limited anti-lock braking system (ABS) actuator bandwidth and limit-cycle ABS behaviour are also analysed. The optimisation results indicate that the FAS can provide competitive stabilisation performance and improved agility when compared to the ESC system, and that it can reduce the braking distance by up to 5% for distinctively non-uniform friction conditions.     

基于浮动车数据挖掘的出租汽车运营特征研究

为支持出租汽车运营评价和行业规划,科学掌握其运营现状与特点,以深圳市一个典型工作日为例,研究浮动车数据挖掘在出租汽车运营特征研究中的应用.依托对浮动车数据的特征解析,提出面向出租汽车运营特征分析的数据处理流程,针对空驶率、运营速度、载客运营时长、出行需求的时空差异等方面分析深圳市出租汽车行业运营现状与特点.该研究可为出租汽车运营评价提供新视角,从对既有数据深度挖掘的角度提升行业效益.     

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“交通运输系统工程学”在钱学森院士的直接关心和指导下创建. 本文介绍了“交通运输系统工程学”创建的全过程,包括：系统科学和系统工程学的引入,系统工程学与交通运输学的融合,交通运输系统工程学的定义、定位和定性,交通运输系统工程学的基础理论和功能,交通运输系统的生产过程与服务,交通运输系统工程学创建的几个阶段,交通运输系统工程学硕、博士学位点的建设与人才培养以及交通运输系统工程学的理论体系与方法等. 最后介绍交通运输系统工程学的社会实践、应用和推广. 表达了对钱老所给予的关怀和指导的感悟与追思.     

Web环境下公路工程造价审查系统研究

针对目前公路工程造价审查体系存在的问题，在分析群体决策支持系统、多Agent和数据库技术发展趋势的基础上，对Web环境下的公路工程造价审查系统的体系框架进行了优化设计。并提出了造价资料的分步综合审查法。     

创建"城市轨道交通学"的可行性探究

以目标和问题为导向,从我国城市轨道交通的战略性及复杂性入手,说明靠传统的工程思路解决问题的低效性,以及用新型的系统观念解决问题的有效性,继而在业内首次提出为实现城市轨道交通发展的更高质量、更可持续,有必要创建一门全新的交叉学科"城市轨道交通学"。随后,对创建"城市轨道交通学"的可行性,从国家学科设置管理、创建学科"三要素"及内外部条件进行了全面分析。最后,对城市轨道交通学的知识体系及创建路径,提出了初步设想,并重点论述坚持系统观念作为"城市轨道交通学"的方法论具有其理论合法性和实践合理性。期盼本文关于城市轨道交通学的知识体系及创建路径,能为行业提供一种思考方向。