车载设备电源智能稳压和报警装置

针对现有老型机车的车载设备电源供电问题,最大限度地防止车载监控和机车信号设备烧损,研制了车载设备电源稳压与报警装置。通过其记录分析功能,规范机务、电务设备电源对接操作,为查找设备故障、预防维修提供依据。     

基于CBTC的车载ATP安全制动曲线计算模型研究

车载ATP系统是保证列车运行安全的系统,其中的关键技术之一是安全制动曲线计算模型。根据IEEE 1474.1TM标准的规定[1],车载ATP安全制动曲线由GEBR制动曲线和ATP紧急制动触发曲线组成。GEBR制动曲线是根据GEBR计算得出的,而ATP紧急制动触发曲线则是根据GEBR制动曲线计算出来的。针对该问题,本文分析了各种影响列车制动距离的因素和GEBR制动曲线与ATP紧急制动触发曲线的关系,建立了CBTC车载ATP安全制动曲线的计算模型。仿真证明,本文提出的计算模型满足IEEE 1474.1TM基于CBTC的车载ATP安全制动模型的要求。     

CRTSⅠ型双块式无砟轨道结构优化设计研究

针对CRTSⅠ型双块式无砟轨道结构特点,提出技术合理,经济性好的优化设计方案。对传统和优化后的CRTSⅠ型双块式无砟轨道在各种荷载作用下的结构受力进行计算对比分析,为优化设计方案提供理论指导。研究结论:(1)优化后的CRTSⅠ型双块式无砟轨道可应用于高速铁路、城际铁路项目;(2)通过轨道结构受力计算可知,在列车荷载作用下,路基地段优化后道床板弯矩比传统CRTSⅠ型双块无砟轨道减少,底座弯矩比传统CRTSⅠ型双块无砟轨道增加;桥梁地段优化后道床板弯矩比传统CRTSⅠ型双块无砟轨道增大,增大幅度不大。单元式结构道床板在整体温度荷载作用下受到的轴力可大幅度减小。     

Onboard monitoring of fatigue damage rates in the hull girder

Most new advanced ships have extensive data collection systems to be used for continuous monitoring of engine and hull performance, for voyage performance evaluation etc. Such systems could be expanded to include also procedures for stress monitoring and for decision support, where the most critical wave-induced ship extreme responses and fatigue damage accumulation can be estimated for hypothetical changes in ship course and speed in the automatically estimated wave environment.The aim of this paper is to outline a calculation procedure for fatigue damage rate prediction in hull girders taking into account whipping stresses. It is conceptually shown how such a method, which integrates onboard estimation of sea states, can be used to deduce decision support with respect to the accumulated fatigue damage in the hull girder.The paper firstly presents a set of measured full-scale wave-induced stress ranges in a container ship, where the associated fatigue damage rates calculated from a combination of the rain-flow counting method and the Palmgren-Miner damage rule are compared with damage predictions obtained from a computationally much faster frequency fatigue analysis using a spectral method. This analysis verifies the applied multi-modal spectral analysis procedure for fatigue estimation for cases where hull girder flexibility plays a role.To obtain an automated prediction method for the fatigue damage rates it is in the second part of the paper shown how a combination of the full-scale onboard acceleration and stress measurements can be used to calculate sea state parameters. These calculated environmental data are verified by a comparison to hindcast data.In the third part of the paper the full-scale fatigue stress ranges are compared to results from an analytical design oriented calculation procedure for flexible ship hulls in short-term estimated sea states.Altogether, it is conceptually shown that by a combination of the onboard estimated sea state parameters with the described analytical fatigue damage prediction procedure a method can be established for real-time onboard decision support which includes estimates of fatigue damage rates.     

舰船主变流机组测试性需求分析

针对舰船主变流机组时常出现火花偏大、功率不足等问题,对舰船主变流机组进行测试性研究。测试性需求分析作为测试性设计的首要步骤,在整个测试性设计工程中起到至关重要的作用,很大程度上决定了测试性设计的成败。本文在总结前人研究成果的基础上,首先介绍了舰船主变流机组的总体功能结构;其次,根据《装备测试性大纲》,对舰船主变流机组进行测试性层次划分;然后,采用基于故障率的测试性分配方法,将系统测试性指标分配至现场可更换单元(LRU)层级,用于指导各现场可更换单元(LRU)的测试性设计,为后续机组测试性的深入研究奠定基础,也为测试性从业人员提供一定的参考。     

汽车控制单元类电气设备CAN连接的优化

对汽车中“控制单元类电气设备”的网络连接进行了分析,提出对其进行“四大整合”的优化措施：即对传感器的整合、对执行器的整合、对ECU的整合及对电源的整合。     

基于AMT的汽车换档手柄ECU的系统设计

介绍在机械式自动变速器AMT汽车中换档手柄控制器ECU的软硬件设计,阐述手柄控制器ECU和AMTECU之间的CAN通讯原理和应用层协议(ApplicationProtocol)。     

CBTC系统中数据库存储单元的下载策略

针对基于通信的列车控制系统(CBTC)中数据库存储单元(DSU)与其他子系统设备的数据下载问题,提出几种下载策略并进行深入分析与比较;使用一种最优下载策略,对DSU下载具体流程进行研究,完善DSU的下载功能,提高整个列车控制系统(ATC)的性能和安全性.     

基于简易IMU的低成本列车定位系统研究

针对我国当前列车定位技术中存在的不足,并结合列车定位的使用环境和实际需要,忽略列车的海拔高度、天向速度和部分姿态角信息,对传统惯性导航系统进行了简化设计,提出了一种低成本的简易惯性测量装置(简易IMU)。文中仅采用一个单自由度陀螺仪和两个加速度计作为惯性测量器件,构成简易IMU,通过导航解算获得列车的即时速度和位置,从而实现列车的导航定位。文中设计了该简易IMU的系统结构,并经详细推导获得其导航定位解算方法。仿真结果表明,该简易IMU能够全天候地对列车进行连续可靠的自主导航定位,导航信息全面且定位精度较高,并显著地降低系统的成本、复杂性和计算量,为解决现有列车定位技术中存在的问题,进行了有益的尝试。     

Approach of Separately Applying Unit Testing to AspectJ Program

A unit testing approach for AspectJ programs is proposed to separately test aspect units which have their own states. In the approach, aspects under test are converted to classes before execution of unit testing. In the conversion process, the context information passed through pointcut is transformed into advices, then the advices are converted to class member methods, and conflicts in the conversion result, if any, are resolved finally. The unit testing process consists of generating test cases, executing test cases and checking results.