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Sensor Configuration and Test for Fault Diagnoses of Subway Braking System Based on Signed Digraph Method

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Chinese Journal of Mechanical Engineering 2014年第3期27卷 475-482页

作者： zuo jianyong CHEN Zhongkai Institute of Railway and Urban Mass Transit Tongji University

Fault diagnosis of various systems on rolling stock has drawn the attention of many researchers. However, obtaining an optimized sensor set of these systems, which is a prerequisite for fault diagnosis, remains a major challenge. Available literature suggests that the configuration of sensors in these systems is presently dependent on the knowledge and engineering experiences of designers, which may lead to insufficient or redundant development of various sensors. In this paper, the optimization of sensor sets is addressed by using the signed digraph （SDG） method. The method is modified for use in braking systems by the introduction of an effect-function method to replace the traditional quantitative methods. Two criteria are adopted to evaluate the capability of the sensor sets, namely, observability and resolution. The sensors configuration method of braking system is proposed. It consists of generating bipartite graphs from SDG models and then solving the set cover problem using a greedy algorithm. To demonstrate the improvement, the sensor configuration of the HP2008 braking system is investigated and fault diagnosis on a test bench is performed. The test results show that SDG algorithm can improve single-fault resolution from 6 faults to 10 faults, and with additional four brake cylinder pressure （BCP） sensors it can cover up to 67 double faults which were not considered by traditional fault diagnosis system. SDG methods are suitable for reducing redundant sensors and that the sensor sets thereby obtained are capable of detecting typical faults, such as the failure of a release valve. This study investigates the formal extension of the SDG method to the sensor configuration of braking system, as well as the adaptation supported by the effect-function method.

关键词： fault diagnosis subway braking system signed directed graph sensor set optimization.

Antiskid Control of Railway Train Braking Based on Adhesion Creep Behavior

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Chinese Journal of Mechanical Engineering 2012年第3期25卷 543-549页

作者： zuo jianyong CHEN Zhongkai Railway and Urban Rail Traffic Academy Tongji UniversityShanghai 200092China

In modern trains wheelset skidding leads to the deterioration of braking behavior,the degradation of comfort,as well as a boost in system *** of the nonlinearity and unknown characteristics of wheelset adhesion,simplifications are widely adopted in the modeling process of conventional antiskid ***,conventional antiskid controllers usually cannot perform *** this paper,systematic computer simulation and field tests for railway antiskid control system are *** operating principal of antiskid control system is explained,which is fundamental to the simulation of antiskid brakes,and the simulation model is introduced,which incorporates both the adhesion creep curve and a pneumatic submodel of antiskid control *** addition,the characteristics of adhesion curves and the simulation target are also *** DHSplus,the pneumatic submodel is created to analyze the performance of the different control strategies of antiskid *** the system simulation is realized by combining the kinematical characteristics of railway trains and the pneumatic *** simulation is performed iteratively to obtain the optimized design of the antiskid control *** design result is incorporated in the hardware design of the antiskid control system and is evaluated in the field tests in Shanghai Subway Line *** by the antiskid efficiency,the antiskid braking performance observed in the field tests shows the superiority of the optimized ***,the proposed simulation method,especially in view of its ease of application,appears to be a useful one for designing railway antiskid control systems.

关键词： antiskid control adhesion creep railway train braking system simulation.

Position Control Optimization of Aerodynamic Brake Device for High-speed Trains

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Chinese Journal of Mechanical Engineering 2014年第2期27卷 287-295页

作者： zuo jianyong LUO Zhuojun CHEN Zhongkai Institute of Railway and Urban Mass Transit Tongji University

The aerodynamic braking is a clean and non-adhesion braking, and can be used to provide extra braking force during high-speed emergency braking. The research of aerodynamic braking has attracted more and more attentions in recent years. However, most researchers in this field focus on aerodynamic effects and seldom on issues of position control of the aerodynamic braking board. The purpose of this paper is to explore position control optimization of the braking board in an aerodynamic braking prototype. The mathematical models of the hydraulic drive unit in the aerodynamic braking system are analyzed in detail, and the simulation models are established. Three control functions--constant, linear, and quadratic--are explored. Two kinds of criteria, including the position steady-state error and the acceleration of the piston rod, are used to evaluate system performance. Simulation results show that the position steady state-error is reduced from around 12-2 mm by applying a linear instead of a constant function, while the acceleration is reduced from 25,71-3.70 m/s2 with a quadratic control function. Use of the quadratic control function is shown to improve system performance. Experimental results obtained by measuring the position response of the piston rod on a test-bench also suggest a reduced position error and smooth movement of the piston rod. This implies that the acceleration is smaller when using the quadratic function, thus verifying the effectiveness of control schemes to improve to system performance. This paper proposes an effective and easily implemented control scheme that improves the position response of hydraulic cylinders during position control.

关键词： high-speed train aerodynamic brake hydraulic position control optimization.

Rail temperature rise characteristics caused by linear eddy current brake of high-speed train

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第6期1卷 448-456页

作者： Xiaoshan Lu Yunfeng Li Mengling Wu jianyong zuo Wei Hu Institute of Railway Transit Tongji University CSR Qingdao Sifang Locomotive Co. Ltd. Ecole Nationale Superieure d'Arts et Metiers AngersPays de la LoireFrance

The rail temperature rises when the linear eddy current brake of high-speed train is working, which may lead to a change of rail physical characteristics or an effect on train operations. Therefore, a study concerning the characteristics of rail temperature rise caused by eddy current has its practical necessity. In the research, the working principle of a linear eddy current brake is introduced and its FEA model is established. According to the generation mechanism of eddy current, the theoretical formula of the internal energy which is produced by the eddy current is deduced and the thermal load on the rail is obtained. ANSYS is used to simulate the rail temperature changes under different conditions of thermal loads. The research result shows the main factors which contribute to the rising of rail temperature are the train speed, brake gap and exciting current. The rail temperature rises non-linearly with the in- crease of train speed. The rail temperature rise curve is more sensitive to the exciting current than the air gap. Moreover, the difference stimulated by temperature rising between rails of 60 kg/m and 75 kg/m is presented as well.

关键词： high-speed train linear eddy current brake thermal load rail temperature rise

Revealing the intrinsic mechanisms for accelerating nitrogen removal efficiency in the Anammox reactor by adding Fe(Ⅱ)at low temperature

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Chinese Chemical Letters 2024年第8期35卷 341-348页

作者： Linjing Li Wenlai Xu jianyong Ning Yaping Zhong Chuyue Zhang Jiane zuo Zhicheng Pan State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China National Postdoctoral Research Station Haitian Water GroupChengdu 610213China National Enterprise Technology Center Haitian Water GroupChengdu 610213China Water Safety and Water Pollution Control Engineering Technology Research Center in Sichuan Province Chengdu 610213China Laboratory of Municipal Wastewater Treatment Technology in Sichuan Province Chengdu 610213China Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolShenzhen 518055China

Fe(Ⅱ)is an essential trace element for anaerobic ammonium oxidation bacteria(AAOB)metabolism,and can improve the nitrogen removal efficiency of anaerobic ammonia oxidation(Anammox).Here we oper-ated two identical expanded granular sludge bed(EGSB)reactors at low temperature(15±3℃)for 154 *** 1(R_(1))received additional Fe(Ⅱ)(0.12 mmol/L)during the late startup phase,while reactor 0(R_(0))served as the control and did not receive extra Fe(Ⅱ).Nitrogen removal in R_(1)became stable at 55 d of operation,ten days earlier than R_(0).The nitrogen removal rate(NRR)of R_(1) was 1.64 kg N m^(−3)d^(−1)and its TN removal rate was as high as 89%,while R_(0)only reached 75%.The addition of Fe(Ⅱ)was fur-ther beneficial to aggregation and stability of the granular sludge,and the used sludge of both reactors showed enrichment for AAOB populations compared to the inoculum,for instance,increased abundance of Candidatus-Kuenenia and in particular of Candidatus-Brocadia(from 0.17%to 10.10%in R_(0)and 7.79%in R_(1)).Diverse microbial species and complex microbial network structure in R_(1)compared to R_(0)promoted the coupled denitrogenation by Anammox,dissimilatory nitrate reduction to ammonium(DNRA),nitrate-dependent Fe oxidation(NDFO),and ferric ammonium oxidation(Feammox).In addition,the microbial community in R_(1)was more resistant to short-term low temperature(2-7℃)starvation,illustrating a further positive effect of adding Fe(Ⅱ)during the startup phase of an Anammox reactor.

关键词： Ambient low temperature Anammox Fe(Ⅱ) Extracellular polymeric substances Microbial community Microbial network analysis

Simulation of Hydraulic System with AMESim for Aerodynamic Brake of High-speed T

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Simulation of Hydraulic System with AMESim for Aerodynamic B...

基于Super smoother和3σ原理的列车动态测试趋势性异常数据清洗方法与分析

2012年计算机应用与系统建模国际会议

作者： ZhuoJun Luo jianyong zuo Liguo Zhang Railway and Urban Rail Traffic Academy Tongji University Technology Center CSR Qingdao Sifang Locomotive and Rolling Stock Co. Ltd.

This paper uses AMESim software to model the hydraulic system in the aerodynamic brake system. First we will have a brief introduction about the hydraulic system to be simulated. Than the hydraulic system is modeled a... 详细信息

关键词： hydraulic system AMESim aerodynamic brake simulation.

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仪器仪表学报 2020年第10期41卷 65-73页

作者：左建勇冯富人丁景贤同济大学铁道与城市轨道交通研究院上海201804

列车动态测试存在数据采集环境干扰大,重复成本高等问题,需要尽可能的从存在异常的数据中保留更多的有效信息。本文针对其中存在的长周期,低频率的趋势性异常数据清洗问题,首先介绍了一种基于Super smoother和3σ原理的数据清洗方法。... 详细信息

列车动态测试存在数据采集环境干扰大,重复成本高等问题,需要尽可能的从存在异常的数据中保留更多的有效信息。本文针对其中存在的长周期,低频率的趋势性异常数据清洗问题,首先介绍了一种基于Super smoother和3σ原理的数据清洗方法。然后通过与其他常用异常数据清洗方法如神经网络,小波变换等的对比,分别从降噪处理,数据漂移处理,缺失数据补充处理和短暂快速异常波动处理四个方面对方法的数据清洗能力进行了分析和验证,结果表明清洗后数据的Pearson系数由0.785上升到0.923,方法在快速清洗和数据修补方面具有较大优势。最后以某城轨列车制动温升试验数据为例,对实际线路测试数据进行了数据清洗处理,结果表明方法能够较好的解决列车动态测试中存在的趋势性异常数据清洗问题。

关键词：列车动态测试趋势性异常数据数据清洗 Super smoother方法

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基于视觉的微机器人结肠镜运动导航

高技术通讯 2006年第4期16卷 372-376页

作者：王坤东颜国正左建勇上海交通大学电子信息学院上海200030

设计出一种用形状记忆合金驱动的头部转动机构和一种基于视觉的控制算法，用其进行了微机器人结肠镜在肠道内的自主导航研究。建立了转动机构模型，推导出记忆合金弹簧位移和偏转角度之间的关系。针对人体腔道内图像特点,使用腐蚀生长... 详细信息

设计出一种用形状记忆合金驱动的头部转动机构和一种基于视觉的控制算法，用其进行了微机器人结肠镜在肠道内的自主导航研究。建立了转动机构模型，推导出记忆合金弹簧位移和偏转角度之间的关系。针对人体腔道内图像特点,使用腐蚀生长法找到腔道中心，反推出头舱的偏转角度和记忆合金弹簧位移。基于Preisach模型,提出了记忆合金驱动的前馈控制算法,进行了数字仿真和猪大肠内离体试验。结果表明，控制算法偏转误差小于2.6°，具有良好的实时性.该系统灵活可靠、控制方便,为主动式无创诊疗内窥镜的临床应用奠定了基础。

关键词：微机器人结肠镜导航视觉控制系统样机

基于等效故障注入试验的列车风源系统故障影响规律与分析

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仪器仪表学报 2023年第5期44卷 44-52页

作者：丁景贤左建勇任利惠同济大学机械工程流动站上海201804 同济大学铁道与城市轨道交通研究院上海201804 同济大学上海市轨道交通结构耐久与系统安全重点实验室上海201804

为获取列车风源系统故障诊断所需特征参量及故障影响规律,针对部分故障模式不可注入或注入具有破坏性等问题,阐述了风源系统的构成原理和故障模式,提出了等效故障模型设计方法及等效故障注入流程,基于等效故障注入试验研究了5种典型故... 详细信息

为获取列车风源系统故障诊断所需特征参量及故障影响规律,针对部分故障模式不可注入或注入具有破坏性等问题,阐述了风源系统的构成原理和故障模式,提出了等效故障模型设计方法及等效故障注入流程,基于等效故障注入试验研究了5种典型故障模式在不同故障程度下的影响规律并分析了故障原因。研究结果表明:等效故障注入试验可以在不对风源系统造成破坏的情况下再现供气不足、油温高以及压缩机不加载3类典型故障现象,且不同故障模式的影响规律和特征参量不同。进气过滤器严重堵塞时总风压力不足740 kPa,造成供气不足现象;温控阀严重卡滞时最高喷油温度和机头排气温度分别较正常值增加了约20℃和17℃,冷却油流量最大减小了约14 L/min;冷却器积灰引起冷却效果下降,环境温度分别为20℃、35℃和50℃时,最大下降约3℃;油严重泄漏时喷油流量高出正常值约19 L/min,机头排气温度最高可达105℃,造成油温高现象;卸荷电磁阀卡滞造成开度为25%~100%时总风压力只有690 kPa,造成供气不足现象,开度为0时空压机第一次正常工作并停机后无法重新启动,造成压缩机不加载现象。研究结果为基于温度、压力等多传感器数据的故障诊断算法设计以及智能风源系统传感器布局提供了参考。

关键词：列车风源系统等效故障注入试验故障模式特征参量传感器布局