Cab signaling apparatus is the critical equipment for ground-vehicle communication in electrified railways.With the rapid development of high-speed and heavy-haul railways,the immunity to unbalanced traction current i...Cab signaling apparatus is the critical equipment for ground-vehicle communication in electrified railways.With the rapid development of high-speed and heavy-haul railways,the immunity to unbalanced traction current interference for cab signaling apparatus in the onboard train control system is increasingly demanded.This paper analyzes the interference coupling mechanism of the ZPW-2000 track circuit.Based on electromagnetic field theory and the actual working parameters,a calculation model is established to complete the quantitative research of the cab signal induction process and traction current interference.Then,a finite element model is built to simulate the process.The simulation results under the signal frequency,fundamental and harmonic interference are all consistent with the theoretical calculation results.The practical measurement data verify the coupling relationship between cab signal inductive voltage and rail current.Finally,an indirect immunity test method applying this relation for the cab signals is proposed,and the voltage indexes of the disturbance sources are determined,i.e.,the test limits.The results provide an accurate quantitative basis for the cab signaling research and design of the immunity test platform;besides,the proposed indirect test method can simplify the test configuration and improve test efficiency.展开更多
机车信号的码序提供了机车信号是否发生故障和发生何种故障的信息。本文分析了机车信号的故障码序,通过总结其规律与特点,将机车信号的故障诊断问题归类为模式匹配问题。并在此基础上将模式匹配问题与机车信号的故障诊断问题相结合,提...机车信号的码序提供了机车信号是否发生故障和发生何种故障的信息。本文分析了机车信号的故障码序,通过总结其规律与特点,将机车信号的故障诊断问题归类为模式匹配问题。并在此基础上将模式匹配问题与机车信号的故障诊断问题相结合,提出了基于多模式匹配算法DFSA(Deterministic Finite State Automata)的机车信号故障诊断模型。该模型通过建立转向(goto)函数、失效(failure)函数和输出(output)函数,利用树型有限自动机实现了对机车信号快速准确的故障诊断。通过对实际的机车信号检测记录仪记录的数据进行故障诊断实验,表明该模型在机车信号故障诊断中的有效性。展开更多
基金This work was supported in part by the China Railway(Grant No.17CR062)Shenzhen Changlong Railway Electronic Engineering Co.,Ltd.(Project Name:Anti-interference Design and Verification Improvement of Cab Signaling Onboard System Apparatus).
文摘Cab signaling apparatus is the critical equipment for ground-vehicle communication in electrified railways.With the rapid development of high-speed and heavy-haul railways,the immunity to unbalanced traction current interference for cab signaling apparatus in the onboard train control system is increasingly demanded.This paper analyzes the interference coupling mechanism of the ZPW-2000 track circuit.Based on electromagnetic field theory and the actual working parameters,a calculation model is established to complete the quantitative research of the cab signal induction process and traction current interference.Then,a finite element model is built to simulate the process.The simulation results under the signal frequency,fundamental and harmonic interference are all consistent with the theoretical calculation results.The practical measurement data verify the coupling relationship between cab signal inductive voltage and rail current.Finally,an indirect immunity test method applying this relation for the cab signals is proposed,and the voltage indexes of the disturbance sources are determined,i.e.,the test limits.The results provide an accurate quantitative basis for the cab signaling research and design of the immunity test platform;besides,the proposed indirect test method can simplify the test configuration and improve test efficiency.
文摘与野生型油菜相比 ,叶绿素缺乏油菜突变体 Cr35 2 9L HC 多肽组成并未发生改变 ,但其含量却都明显降低 .RNA印迹及点杂交结果都显示出 Cr35 2 9cab基因的转录增加 .这些结果表明 :该叶绿素缺乏突变体仅影响L HC 多肽的蛋白含量 ;并未影响其组成 ;突变体 L HC 蛋白量的减少并非 cab基因转录降低所致 .可见转录水平的调节仅对 L HC 在类囊体膜上的积累起有限作用 ;
文摘机车信号的码序提供了机车信号是否发生故障和发生何种故障的信息。本文分析了机车信号的故障码序,通过总结其规律与特点,将机车信号的故障诊断问题归类为模式匹配问题。并在此基础上将模式匹配问题与机车信号的故障诊断问题相结合,提出了基于多模式匹配算法DFSA(Deterministic Finite State Automata)的机车信号故障诊断模型。该模型通过建立转向(goto)函数、失效(failure)函数和输出(output)函数,利用树型有限自动机实现了对机车信号快速准确的故障诊断。通过对实际的机车信号检测记录仪记录的数据进行故障诊断实验,表明该模型在机车信号故障诊断中的有效性。
