聚天冬氨酸的合成及应用研究

以马来酸酐和铵盐为原料,成功合成了聚天冬氨酸(PASP),探讨了合成条件对PASP的产率和分子量的影响,确定最佳合成工艺为:铵盐为铵盐A,酐氨用料比为1∶1.2,聚合温度为180℃,聚合时间1 h.并运用红外光谱、差热-热重分析等手段对PASP进行了性质表征,进一步研究了PASP的阻垢、分散、缓蚀等应用性能以及生物降解性能,并对PASP的聚合机理、生物降解机理进行了较详细的讨论.     

Particle Filter and Its Application in the Integrated Train Speed Measurement

Particle filter(PF) can solve the problem of state estimation under strong non-linear non-Gaussian noise condition with respect to traditional Kalman filter(KF) and those improved KFs such as extended KF(EKF) and unscented KF(UKF). However, problems such as particle depletion and particle degradation affect the performance of PF. Optimizing the particle set to high likelihood region with intelligent optimization algorithm results in a more reasonable distribution of the sampling particles and more accurate state estimation. In this paper, a novel bird swarm algorithm based PF(BSAPF) is presented. Firstly, different behavior models are established by emulating the predation, flight, vigilance and follower behavior of the birds. Then, the observation information is introduced into the optimization process of the proposal distribution with the design of fitness function. In order to prevent particles from getting premature(being stuck into local optimum) and increase the diversity of particles, Lévy flight is designed to increase the randomness of particle's movement. Finally,the proposed algorithm is applied to estimate the speed of the train under the condition that the measurement noise of the wheel sensor is non-Gaussian distribution. Simulation study and experimental results both show that BSAPF is more accurate and has more effective particle number as compared with PF and UKF, demonstrating the promising performance of the method.     

城市轨道交通下一代CBTC系统发展展望

总结了城市轨道交通既有CBTC(基于无线通信的列车控制)系统设计的技术特点,分析了当前已经处于研究阶段或工程实施阶段的典型下一代CBTC系统的设计方案。在此基础上,预测了下一代CBTC系统几个可能的发展方向及其特点,评估了这些发展方向面临的技术风险以及产品化所需的时间。     

列车组合测速系统安全完整性分析

采用编码里程计及多普勒雷达进行组合测速,描述了列车组合测速平台的主要结构,提出了利用卡尔曼滤波残差字2来检测列车空转/打滑故障的方法。采用故障树分析法对列车组合测速系统进行了故障分析,并对其故障树进行重构,根据实际参数对组合测速系统危险侧失效率进行了计算。计算结果证明,利用多普勒雷达补偿列车空转/打滑,列车组合测速系统的安全完整性符合SIL 4等级。     

卡斯柯自主知识产权的iCMTC型CBTC信号系统

介绍卡斯柯信号有限公司自主化iCMTC型CBTC信号系统的系统架构、安全开发过程和高效工程化保证。iCMTC系统是在国外先进成熟系统之上自主创新开发而成,系统经过充分测试,获得SIL4安全认证,其系统具有安全、可靠、成熟的特点。