车载定位技术在出租车调度系统中的应用

介绍了出租车调度系统的构成及其功能。调度指挥中心系统作为调度系统的核心,能够实现卫星定位、查询管理、电招、报警等功能。而车载定位导航系统主要是借助GPS(GlobalPositionSystem)全球定位系统来实现的。GPS全球定位系统是全球性、全天候、连续的卫星无线电导航系统,它可提供实时的三维位置,三维速度和高精度的时间和信息。出租车调度系统的建立可有效地提高出租车行业的服务水平和城市文明形象。     

模糊控制技术在船舶动力定位中的应用研究

在进行某船动力定位系统的设计过程中,采用了模糊控制器作为系统的控制器,并针对仿真过程中出现的问题进行优化,得到了一个切实可行的模糊控制器,并对该模糊控制器进行了仿真试验验证。     

Daily rhythms of suburban commuters’ movements in the Tallinn metropolitan area: Case study with mobile positioning data

The objective of this study is to analyse the diurnal rhythms of city life and its spatial differences in Tallinn, using mobile telephone positioning data. The positioning experiment was carried out in April 2006 over an 8-day period and 15-min intervals, with a random sample of 277 respondents living in new residential areas outside the city of Tallinn.The investigation of the space–time movements and daily distances of respondents showed that the majority of respondents had a similar temporal rhythm related to work, school, services and leisure in the city. Because of the different timing of those activities, the mobile positioning data made it possible to map functional differences in the city. The advantages and disadvantages of mobile positioning data in mapping urban life are discussed in the final section of the study.     

中心城区主干路改造的设计要点探讨

中心城区主干路一般建成时间较早,随着城市化进程的加快和社会经济的发展,现状市政交通、管线已不能满足沿线用户的需求;路面出现不同程度损坏,影响了行车的安全性和舒适性;沿线各类城市市政设施缺乏统一性和规范性,严重影响了道路交通和城市周边形象,制约了城市形象的提升和进一步发展.针对中心城区主干路改造的设计要点,从道路功能定位、纵断面控制、路面材料、轨道交通协调与管理、现有乔木的处理等方面进行阐述.     

安康市汉江景观桥设计方案研究

安康依汉江而建，桥位处周边建筑具有重要的历史文化意义，且桥位两边连接安康重要的街道和火车站。汉江景观桥在桥位走向、桥型选择与周边历史文化的契合度、景观桥与汉江两边道路的衔接等方面是重点研究的课题，从设计思路、功能定位、桥位比较、桥型方案、造价等对安康市汉江景观桥设计方案进行了研究。     

适于TBM施工的HSP法实时预报技术设计与实现

为实现TBM施工隧道的实时地质预报，以TBM刀盘滚刀破岩震动作为震源的HSP法地质预报技术为基础，通过分析TBM施工工艺与机身结构特点，对HSP系统硬件和软件进行优化设计，使其小型化、自动化和智能化，并搭载于TBM上进行智能控制。在TBM掘进过程中，首先，通过隧道轮廓位置的检波器连续或高频次地采集地震反射波信号； 然后，经系统软件对数据的自动处理，实时获取掌子面前方地层反射特征参数图谱； 其次，通过智能识别技术完成对不良地质反射界面的有效拾取与判识； 最后，实现不良地质的探测。通过对适于TBM施工的HSP法实时预报技术进行优化设计，实时探查前方地层不良地质(体)位置、规模与性质，为TBM的高效施工起到一定的推助作用。     

Parameters optimisation of a vehicle suspension system using a particle swarm optimisation algorithm

The purpose of this paper is to determine the lumped suspension parameters that minimise a multi-objective function in a vehicle model under different standard PSD road profiles. This optimisation tries to meet the rms vertical acceleration weighted limits for human sensitivity curves from ISO 2631 [ISO-2631: guide for evaluation of human exposure to whole-body vibration. Europe; 1997] at the driver's seat, the road holding capability and the suspension working space. The vehicle is modelled in the frequency domain using eight degrees of freedom under a random road profile. The particle swarm optimisation and sequential quadratic programming algorithms are used to obtain the suspension optimal parameters in different road profile and vehicle velocity conditions. A sensitivity analysis is performed using the obtained results and, in Class G road profile, the seat damping has the major influence on the minimisation of the multi-objective function. The influence of vehicle parameters in vibration attenuation is analysed and it is concluded that the front suspension stiffness should be less stiff than the rear ones when the driver's seat relative position is located forward the centre of gravity of the car body. Graphs and tables for the behaviour of suspension parameters related to road classes, used algorithms and velocities are presented to illustrate the results. In Class A road profile it was possible to find optimal parameters within the boundaries of the design variables that resulted in acceptable values for the comfort, road holding and suspension working space.     

斗轮式取料机行走位置精确定位

斗轮式取料机行走位置校正装置在定位中起到很重要的作用.分析了原有行走机构定位原理与状况.介绍了新定位装置的设计思路和实施方案,改革后提高了全场设备相互协同的效率和相互保护的可靠性.     

海上施工定位方法及精度分析

论述了海上工程定位的方法。从计算方法和精度讨论入手 ,阐述了选取要求及注意事项 ,给出了相应的计算和改正计算公式     

基于角度变化率的机动目标单站无源定位

机动目标无源定位和跟踪技术在航空、制导等领域都有着非常广泛的应用,一直是人们的研究热点。文章运用了运动学原理,在传统测角定位技术基础上加以改进,增加了角度变化率信息,并采用IMM算法,实现了单站无源机动目标跟踪。计算机仿真验证了该方法的正确性与有效性。