The excessive use of nodes and communication links in a wireless control system (WCS) causes unne... more The excessive use of nodes and communication links in a wireless control system (WCS) causes unnecessary utilization of resources. In this article, a strategic topological formation is studied for a WCS, where a previously proposed topology consisting of a plant system, a controller system, and an intermediate network system is further developed. More specifically, this article presents a modeling framework and a design procedure for the topology that results in the utilization of a reduced number of nodes and communication links. It also discusses several conditions for the connectivity of the nodes under different topological scenarios. This article uses a four-tank process system as an application example to demonstrate the strategic topological formation of its WCS.
This article proposes a design framework for an event-triggered active fault-tolerant control sys... more This article proposes a design framework for an event-triggered active fault-tolerant control system. The considered control system is modelled with an injected actuator fault into the plant system, and it includes: (i) two event detectors to determine when information is to be sampled or updated, (ii) a fault diagnosis observer to provide the fault and state information, and (iii) a fault-tolerant controller to compensate the fault. The proposed design framework allows for the separation of the designs of the fault diagnosis observer and the fault-tolerant controller, to mitigate the coupling effect caused by the event-triggered mechanisms and avoid the computations of a higher order system. Also, a design procedure is presented to deliver the computation of the design variables to reduce the information transfer, in both centralised and decentralised cases. Finally, a batch reactor benchmark system is adopted to demonstrate the applicability and superiority of the proposed design framework.
Abstract The availability of large volumes of alarm & event data in complex industrial facili... more Abstract The availability of large volumes of alarm & event data in complex industrial facilities has prompted the development of alarm management techniques and also resulted in a great demand to transform such data and derived results into effective visual forms. Even though good visualization applications can be found in many existing studies, systematic studies to the design of visualization plots are still rare in the area of industrial alarm monitoring. More efforts need to be devoted to enriching the family of visualization techniques, so as to help industrial practitioners in better understanding the behavior of alarm systems and to facilitate decision making for the enhancement of alarm management. This paper presents timely work in the design of visualization plots of alarm & event data. First, a comprehensive literature survey is carried out to investigate existing visualization techniques, which are categorized into three classes based on the input information. Problems in the existing studies are summarized and design requirements for visual analytics are presented. Then, design studies on the development of visualization plots are presented in three categories, including visualization towards overall performance, visualization towards pattern insights, and visualization towards realtime applications. Examples are provided to demonstrate the effectiveness and utility of these visualization techniques.
The excessive use of nodes and communication links in a wireless control system (WCS) causes unne... more The excessive use of nodes and communication links in a wireless control system (WCS) causes unnecessary utilization of resources. In this article, a strategic topological formation is studied for a WCS, where a previously proposed topology consisting of a plant system, a controller system, and an intermediate network system is further developed. More specifically, this article presents a modeling framework and a design procedure for the topology that results in the utilization of a reduced number of nodes and communication links. It also discusses several conditions for the connectivity of the nodes under different topological scenarios. This article uses a four-tank process system as an application example to demonstrate the strategic topological formation of its WCS.
This article proposes a design framework for an event-triggered active fault-tolerant control sys... more This article proposes a design framework for an event-triggered active fault-tolerant control system. The considered control system is modelled with an injected actuator fault into the plant system, and it includes: (i) two event detectors to determine when information is to be sampled or updated, (ii) a fault diagnosis observer to provide the fault and state information, and (iii) a fault-tolerant controller to compensate the fault. The proposed design framework allows for the separation of the designs of the fault diagnosis observer and the fault-tolerant controller, to mitigate the coupling effect caused by the event-triggered mechanisms and avoid the computations of a higher order system. Also, a design procedure is presented to deliver the computation of the design variables to reduce the information transfer, in both centralised and decentralised cases. Finally, a batch reactor benchmark system is adopted to demonstrate the applicability and superiority of the proposed design framework.
Abstract The availability of large volumes of alarm & event data in complex industrial facili... more Abstract The availability of large volumes of alarm & event data in complex industrial facilities has prompted the development of alarm management techniques and also resulted in a great demand to transform such data and derived results into effective visual forms. Even though good visualization applications can be found in many existing studies, systematic studies to the design of visualization plots are still rare in the area of industrial alarm monitoring. More efforts need to be devoted to enriching the family of visualization techniques, so as to help industrial practitioners in better understanding the behavior of alarm systems and to facilitate decision making for the enhancement of alarm management. This paper presents timely work in the design of visualization plots of alarm & event data. First, a comprehensive literature survey is carried out to investigate existing visualization techniques, which are categorized into three classes based on the input information. Problems in the existing studies are summarized and design requirements for visual analytics are presented. Then, design studies on the development of visualization plots are presented in three categories, including visualization towards overall performance, visualization towards pattern insights, and visualization towards realtime applications. Examples are provided to demonstrate the effectiveness and utility of these visualization techniques.
Uploads
Papers by ahmad dabbagh