Hybrid-triggered fault detection filter design for networked Takagi–Sugeno fuzzy systems subject to persistent heavy noise disturbance

In the network environment, the single time-triggered scheme wastes limited bandwidth resources due to all the sampled data are transmitted to the networks, and the single event-triggered scheme may increase system error because of ignoring factors such as changes in network utilization. To reduce the design conservatism, this paper is concerned with the hybrid-triggered L₁ fault detection filter design for a class of nonlinear networked control systems (NCSs) described by Takagi–Sugeno (T-S) fuzzy model. Taking the effects of time-triggered scheme and event-triggered scheme into consideration simultaneously, we construct a fuzzy fault detection system. New results on stability and L₁ performance are proposed for fuzzy fault detection system by exploiting the Lyapunov–Krasovskii functional and by means of the integral inequality method. Specially, attention is focused on the design of fault detection filter that guarantees a prescribed L₁ noise attenuation level . Finally, two examples are presented to demonstrate the effectiveness of the proposed method.     

汽轮发电机组润滑油系统的故障诊断及分析

润滑油系统是汽轮发电机组中非常重要的辅助系统，该辅助系统的安全性直接关系到整个发电机组的工作效率和运行可靠性。润滑油系统在汽轮机中起到润滑、散热、减振的作用，因此，做好汽轮发电机组润滑油系统的故障诊断和分析工作至关重要。     

A review and comparison of fault detection and diagnosis methods for squirrel-cage induction motors: State of the art

Preventing induction motors (IMs) from failure and shutdown is important to maintain functionality of many critical loads in industry and commerce. This paper provides a comprehensive review of fault detection and diagnosis (FDD) methods targeting all the four major types of faults in IMs. Popular FDD methods published up to 2010 are briefly introduced, while the focus of the review is laid on the state-of-the-art FDD techniques after 2010, i.e. in 2011–2015 and some in 2016. Different FDD methods are introduced and classified into four categories depending on their application domains, instead of on fault types like in many other reviews, to better reveal hidden connections and similarities of different FDD methods. Detailed comparisons of the reviewed papers after 2010 are given in tables for fast referring. Finally, a dedicated discussion session is provided, which presents recent developments, trends and remaining difficulties regarding to FDD of IMs, to inspire novel research ideas and new research possibilities.     

LD4型电动刀架的故障诊断及维修

介绍了LD4型电动刀架的工作原理，针对其常见的几种故障现象进行分析并提出维修方法，以供参考。     

Data-driven design of monitoring and diagnosis systems for dynamic processes: A review of subspace technique based schemes and some recent results

In this paper, the development of data-driven design of process monitoring and fault diagnosis (PM-FD) systems is reviewed and some recent results are presented. A major objective of this work is to sketch a process input–output data based framework of designing PM-FD systems for dynamic processes. The main focus of our study is on the data-driven design of observer-based PM-FD systems, which are, thanks to their high robustness and real-time ability, suitable for industrial applications.     

某转管自动机停射故障分析

根据某自动机工作原理和试验情况,分析故障现象,建立了各故障现象间的关系框图,通过详细推理分析和验证,还原故障发生过程。经多方排查验证,最终确定故障原因为左供弹接口和进弹机交接处有负间隙现象,高速进弹时碰撞炮弹药筒口部使外形异常,推弹时受阻,引起后续相关零部件工作异常,进而造成连锁式损坏和最终停射故障。经分析和多次模拟试验,改进优化供、进弹交接处间隙,通过多门炮射击试验验证,再未出现类似停射故障。     

Active fault‐tolerant control for near space vehicles based on reference model adaptive sliding mode scheme

In this paper, an adaptive sliding mode (ASM) scheme is proposed for fault identification and fault‐tolerant control of near space vehicles (NSVs). First, the attitude dynamic model is introduced, and a baseline controller based on reference sliding mode scheme is designed in the case of no faults. Then fault parameterizations with actuator dynamics is presented for several classes of faults: lock‐in‐place, float, hard‐over, and loss of effectiveness. On the basis of adaptive observer design, fault parameters can be accurately estimated on‐line. Furthermore, an ASM fault‐tolerant controller is designed for both cases of actuator dynamic faults and control effector damage. Finally, simulation experiments show that the proposed ASM scheme is able to quickly and accurately identify faults and reconfigure the controller, resulting in excellent overall system performance. Copyright © 2012 John Wiley & Sons, Ltd.     

Two fault‐tolerant control problems for multiple‐integrator networks

The paper considers a network of agents with multiple‐integrator internal dynamics, which share partial information on their states according to an arbitrary topology. For this system, two control problems are addressed and solved. The first consists in assigning the dominant closed‐loop poles. The second consists in achieving a specified consensus with arbitrary dominant dynamics. In both cases, the regulator is required to be decentralized, and the controlled network has to result tolerant with respect to faults in the communication apparatuses of the agents. Copyright © 2015 John Wiley & Sons, Ltd.     

增压机的振动故障分析及处理

针对化工集团的增压机振动故障进行分析,诊断出振动故障的原因,准确地找出了故障源：在中压缸推力侧振动值突然升高,是由于转子不平衡引起的振动;在增速机输出侧振动值突然升高,是由于联轴器故障引起的振动.     

用六西格玛方法实现超细粉自动控制系统的故障分析及改进

以降低超细粉自动控制系统故障时间为例,介绍了六西格玛管理方法的应用,通过确定程序合理度和磨内压差为核心影响因子,分别制定改进方案,并将改进措施标准化,同时对故障时间进行SPC监控。改进后,故障时间呈逐月下降趋势,表明采取的措施是有效的。