Wire position monitor(WPM)is designed to monitor contraction of the cold masses during the cooling-down operation in an accelerator driven system.Because of material difference,machining error,assembly error,etc.,each...Wire position monitor(WPM)is designed to monitor contraction of the cold masses during the cooling-down operation in an accelerator driven system.Because of material difference,machining error,assembly error,etc.,each WPM has to be calibrated.The sensing voltage and wire position are of a nonlinear relationship,which is expressed by high order polynomial.Root mean square(RMS)of the polynomial fitting error were 3.8μm and 7.4μm at x and y directions,respectively.The alignment test was carried out on the beta cryostat.Optical instruments were used to verify the WPM measuring results.The differences between WPM measuring results and optical measurements were 0.044 and 0.05 mm in x and y direction,respectively.A significant asymmetric contraction was detected,and asymmetry of material was taken as the main reason through analysis.展开更多
Oscillatory failure cases(OFC)detection in the fly-by-wire(FBW)flight control system for civil aircraft is addressed in this paper.First,OFC is ranked four levels:Handling quality,static load,global structure fatigue ...Oscillatory failure cases(OFC)detection in the fly-by-wire(FBW)flight control system for civil aircraft is addressed in this paper.First,OFC is ranked four levels:Handling quality,static load,global structure fatigue and local fatigue,according to their respect impact on aircraft.Second,we present voting and comparing monitors based on un-similarity redundancy commands to detect OFC.Third,the associated performances,the thresholds and the counters of the monitors are calculated by the high fidelity nonlinear aircraft models.Finally,the monitors of OFC are verified by the Iron Bird Platform with real parameters of the flight control system.The results show that our approach can detect OFC rapidly.展开更多
针对接触网检修作业中挂接地线状态依赖人工判别的安全风险,设计一种基于远距离无线电(Long Range Radio,LoRa)通信的接电夹可更换式接地线智能监测系统。该系统基于LoRa低功耗广域通信技术,构建监测层、传输层、控制层、应用层架构,硬...针对接触网检修作业中挂接地线状态依赖人工判别的安全风险,设计一种基于远距离无线电(Long Range Radio,LoRa)通信的接电夹可更换式接地线智能监测系统。该系统基于LoRa低功耗广域通信技术,构建监测层、传输层、控制层、应用层架构,硬件集成接地状态传感模块、高级精简指令集机器(Advanced Reduced Instruction Set Computer Machine,ARM)主控芯片、LoRa无线单元。通过建立三自由度力学模型量化输电线路在风致激励下的空间舞动幅度,结合实时载流量反演接地回路电流,动态评估挂接可靠性。监测数据经过LoRa网络远距离传输至调度中心,实现接地状态实时感知、风险预警、闭环管理。展开更多
基金Supported by the Project of Injector I Mechanical&Technical Support System
文摘Wire position monitor(WPM)is designed to monitor contraction of the cold masses during the cooling-down operation in an accelerator driven system.Because of material difference,machining error,assembly error,etc.,each WPM has to be calibrated.The sensing voltage and wire position are of a nonlinear relationship,which is expressed by high order polynomial.Root mean square(RMS)of the polynomial fitting error were 3.8μm and 7.4μm at x and y directions,respectively.The alignment test was carried out on the beta cryostat.Optical instruments were used to verify the WPM measuring results.The differences between WPM measuring results and optical measurements were 0.044 and 0.05 mm in x and y direction,respectively.A significant asymmetric contraction was detected,and asymmetry of material was taken as the main reason through analysis.
文摘Oscillatory failure cases(OFC)detection in the fly-by-wire(FBW)flight control system for civil aircraft is addressed in this paper.First,OFC is ranked four levels:Handling quality,static load,global structure fatigue and local fatigue,according to their respect impact on aircraft.Second,we present voting and comparing monitors based on un-similarity redundancy commands to detect OFC.Third,the associated performances,the thresholds and the counters of the monitors are calculated by the high fidelity nonlinear aircraft models.Finally,the monitors of OFC are verified by the Iron Bird Platform with real parameters of the flight control system.The results show that our approach can detect OFC rapidly.
文摘针对接触网检修作业中挂接地线状态依赖人工判别的安全风险,设计一种基于远距离无线电(Long Range Radio,LoRa)通信的接电夹可更换式接地线智能监测系统。该系统基于LoRa低功耗广域通信技术,构建监测层、传输层、控制层、应用层架构,硬件集成接地状态传感模块、高级精简指令集机器(Advanced Reduced Instruction Set Computer Machine,ARM)主控芯片、LoRa无线单元。通过建立三自由度力学模型量化输电线路在风致激励下的空间舞动幅度,结合实时载流量反演接地回路电流,动态评估挂接可靠性。监测数据经过LoRa网络远距离传输至调度中心,实现接地状态实时感知、风险预警、闭环管理。
