关于城市公交发展模式的讨论

快速公交与轨道交通的建设费用快速公交的建设费用约为轨道交通的1/10,这主要因为快速公交可利用现有道路条件,而轨道交通往往需要新辟路权;轨道交通车辆比快速公交车辆贵许多,但轨道交通车辆运营年限是快速公交车辆的几倍,二者只是一次投资与分期付款的区别。一些大城市的现有     

基于无线射频技术的汽车轮胎胎压监测系统研究

胎压异常严重威胁着交通安全,随时会造成交通事故,是汽车安全问题上的一个关键点.针对这个现象,本设计提出了一种基于51单片机的汽车胎压监测系统,以此来实现监测胎压异常的功能.本次设计是以STC89C52单片机为核心,气压传感器、无线传输模块、LCD为主要器件,设计一块接收模块和一块采集模块.将带有压力传感器的采集模块置入...     

发动机排气热量测量方法比较研究

介绍了目前常用的排气热量测量方法,即直接测量法和间接测量法;通过测量WD615柴油机排气热量,对两种方法进行比较研究。试验结果表明,在试验条件有限时,采用直接测量法可以得到相对更好的结果。     

气体燃料发动机空燃比的H∞控制

在充分考虑外部干扰和系统模型不确定性的情况下,将混合灵敏度H∞设计引入多点喷射燃气发动机空燃比控制中,将发动机空燃比控制转化为H∞标准设计。仿真结果表明,H∞控制器具有良好的跟踪性、鲁棒稳定性和抗干扰能力。     

DC01型电动列车牵引控制单元及其插件板微机检测装置

介绍了上海轨道交通DC01型电动列车牵引控制单元及其插件板微机检测装置的检测原理和软硬件结构。阐述了工控主机、电气控制箱等硬件设计,以及检测装置软件的主程序模块设计、插件板检测程序设计、静态程序设计等软硬件方面所需要解决的关键技术及其实现方法。该装置的研制运用提高了牵引控制单元系统及其插件板的检修质量和检修效率。     

实现自动报站的新方法

电脑报站器已被广泛应用到城市公共汽车上,但每次报站都需要司机进行手工操作,这不仅增加了司机的劳动强度,也于安全行车不利.     

城市轨道交通杂散电流及轨道对地绝缘测试

介绍了城市轨道交通杂散电流的基本概念、杂散电流腐蚀的机理,以及杂散电流的危害。阐述了减小钢轨电阻、增加泄漏路径对地电阻、设置杂散电流收集网等减少杂散电流的方法。讨论了轨道对地绝缘测试的方法。     

A bayesian based process monitoring and fixture fault diagnosis approach in the auto body assembly process

The auto body process monitoring and the root cause diagnosis based on data-driven approaches are vital ways to improve the dimension quality of sheet metal assemblies. However, during the launch time of the process mass production with an off-line measurement strategy, the traditional statistical methods are difficult to perform process control effectively. Based on the powerful abilities in information fusion, a systematic Bayesian based quality control approach is presented to solve the quality problems in condition of incomplete dataset. For the process monitoring, a Bayesian estimation method is used to give out-of-control signals in the process. With the abnormal evidence, the Bayesian network (BN) approach is employed to identify the fixture root causes. A novel BN structure and the conditional probability training methods based on process knowledge representation are proposed to obtain the diagnostic model. Furthermore, based on the diagnostic performance analysis, a case study is used to evaluate the effectiveness of the proposed approach. Results show that the Bayesian based method has a better diagnostic performance for multi-fault cases.     

Online fault diagnosis of modern process industry system based on color-spectrum

This paper proposes a new method to diagnose the system fault of the process industry based on the monitor data set of distributed control system (DCS). Firstly, it defines a homeomorphism product space named color phase space which is a Cartesian product of two-dimensional Euclidean space and three-dimensional color phase space. Secondly, it maps the DCS data to the color phase space in order to get a system color-spectrum which displays the inherent relationship of the whole system. Then, it diagnoses the system fault by observing the color change on the color-spectrum depending on the physiological characteristics that human’s eyes are more sensitive for the color change than data change.     

合乘模式下司机收入公平模型及仿真

针对出租车合乘模式下司机的收入问题,建立了合乘模式下司机收入公平心理模型,采用公平理论分析了司机的心理及行为,通过仿真计算,分析了合乘模式下乘客总需求量及司机公平心理对司机收入的影响.研究结果表明,乘客总需求对合乘模式下司机总体的平均收入有较大的影响,合适的供需比下实施合乘才能提高司机收入;在供需比较大时,司机争抢乘客的行为会导致司机个体收入差距增大,部分司机收入降低的现象;为成功实施合乘模式,必须考虑当地出租车市场的供需比情况,并且建立合理的措施以防范司机争抢乘客的行为出现.所得结论对出租车合乘政策的制定与管理有一定的指导意义.