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Process monitoring of incipient faults, as opposed to abrupt faults, in an industrial process is increasingly becoming more important. These are slowly developing faults that may eventually lead to severe abnormal conditions, and ultimately, failure of a critical component. Data-driven multivariate statistical process monitoring (MSPM) methods are extensively studied and widely used for abrupt fault...
This paper will describe recent developments in the practical application of multivariate Statistical Process Control (SPC) techniques to improve and automate anomaly detection in complex systems as part of a comprehensive Condition Based Maintenance (CBM) system. The CBM implementation process will be broken down into phases from planning to operation. The operational CBM system includes data acquisition,...
On the example of operations for manufacturing the “Axis” detail, the effectiveness of statistical control of the technological production process for the “Nalchik plant of highvoltage equipment” is demonstrated. Specific recommendations on the effective quality assurance of parts are given.
Development of science and technologies dictates need for development of new methods of management of quality. Along with already available methods and the systems of quality management new approaches appear. Some directions of improvement existing and creations of new tools, methods and the systems of quality management are shown in article.
As a rule, large modern enterprises use not only one but several information systems: APCS, CAD/CAM/CAE, SCADA. These systems create the complex environment of interacting structures which include storage, processing, translation confidential information modules. The goal is to integrate and automate the processes of information defence in the systems with minimal impact on their productivity.
This paper presents new approaches for construction of knowledge-oriented control systems. The AND/OR-graph model is improved for control rules visualization and interactive processing. The knowledge-oriented system for the dispatcher that regulates the safe operation with electrical equipment made it possible to increase the reliability of decisions taken by the dispatcher by 12%.
Within the South African, Eskom, National Control Centre, highly skilled individuals are responsible for the control of the transmission grid. It is imperative that we understand how these individuals make fast complex decisions when they perform control operations. In order to obtain information about the mental processes, which enable them to make fast intuitive decisions a three-part protocol was...
The paper describes Web SCADA Systems, designed by the authors, for monitoring and automation of control processes in the specialized pyrolysis complexes (SPC) for municipal polymeric waste (MPW) utilization. The functional structure and main components of the generalized SPC Web SCADA system are given. The specific example of the proposed SPC Web SCADA system application is also presented. Considerable...
Process control theory has developed to the point where advanced controllers are able to perform optimization and even planning functions on complex, possibly nonlinear, processes. Advances in digital technologies have enabled the industrial implementation of many of these automation strategies, resulting in the process industry achieving all-time highs in production with less need for human intervention...
The paper explores the features of functional modeling of the process of development of control and monitoring systems, using the example of the system of energy-saving control of technological objects.
A phasor measurement unit (PMU)-based wide area monitoring and control (WAMC) system is an essential part of the next-generation smart power grid. The performance of a WAMC system largely depends on the time delay of transmitting data through the communication network used by the WAMC system. This paper proposes a time delay model of the WAMC system. The model considers the time delays caused by data...
The idea of controller performance assessment is becoming very important in the process control area. One of the main performance monitoring index is based on the minimum variance control benchmark proposed by Harris. However, the low value of this index means only low performance of the controller. So, it is difficult to tune the controlled parameters based on this index. This paper considers the...
In an industrial facility, a large amount of data on the operation of the facility is collected. The data includes control variables used in monitoring and regulation, alarm variables displayed to notify operators of abnormalities, and operators' actions taken to correct abnormalities as well as to operate the facility. As the data is historized and is readily accessible, it can provide a wealth of...
In this paper, a wavelet-based statistical method is proposed for health monitoring and fault diagnosis. This method integrates the statistical process control technology and the discrete wavelet transform. A statistical indicator based on discrete wavelet transform is constructed, and the X-bar chart is used to monitor the indicator. The fault frequency can be identified in the Hilbert envelope spectrum...
this paper describes the plan design and technical features of 220kV Wangtie Smart substation, which includes many technical innovations, such as integrated measurement, control & protection devices, new busbar differential protection synchronization, adaptive sampling delay compensation of optical longitudinal differential protection, sampled value transmission mode based on online switching...
Today's complex processes and plants are vulnerable to different faults, misconfiguration, non-holistic and improper control and management which cause abnormal behavior and might eventually result in poor and sub-optimal operation, dissatisfaction, damage to the plant, to personnel and resources, or even to the environment. To cope with these, adverse condition and critical event prediction plays...
this paper proposed a method to monitor the quality of Fused Deposition Modeling (FDM) products using Statistical Process Control (SPC) based on profile data. Profile data is extracted from product surface image of each layer. Tanimoto similarity between the current profile data and the ideal one is calculated, then used to monitor the manufacturing process. Simulation study is presented to show the...
New insights on the stochastic nature of aging-related timing impact in digital circuits trigger the need for aging compensation control loop. Such control loops enable additional 22% power savings but require dedicated safety measures (either margin or monitoring) to enable fault-free operations even in cases of out-of-specifications usage.
This paper introduces the composition of continuous emission monitoring system, and the basic concepts of the artificial intelligent technologies. According to the engineering practice and the basic concepts, authors found that the sampling handing system is prone to malfunction. Furtherly, the sampling probe unit is more vulnerable, so PLC control system of the probe is detailed analyzed. In addition,...
Nowadays, the constantly changing market demands make modern automation systems offer more strict flexibility and efficiency requirements as energy efficiency, performance optimization and tolerance to process or controllers faults… The introduction of reconfiguration mechanisms within production automation systems allow meeting some of these requirements but, at the same time, they lead more complex...
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