112 research outputs found
A method for detecting non-stationary oscillations in process plants
This paper proposes a method for detecting oscillations in non-stationary timeseries based on the statistical properties of zero-crossings. The main development presented is atechnique to remove non-stationary trend component from the analysed signals before applyingan oscillation detection procedure. First, the method extracts the signal's baseline that is utilizedto stationarize the signal. Then, an index describing the regularity of the stationarized signal'szero-crossings is computed in order to determine the presence of oscillation. The propertiesand performance of the method are analysed in simulation studies. Furthermore, the methodis comprehensively tested with industrial data in a comparative study in which the proposedmethod is tested against other oscillation detection methods using industrial benchmark dataand in tests on paperboard machine process. Finally, the simulation and industrial results areanalysed and discussed.Peer reviewe
Experiments and modeling of fixed-bed debarking residue pyrolysis: The effect of fuel bed properties on product yields
This paper presents a study on the fixed-bed pyrolysis of debarking residue obtained from Norway spruce. Analysis is based on the dynamic model of packed bed pyrolysis which was calibrated by determining appropriate reaction rates and enthalpies to match the model predictions with the experimental data. The model comprises mass, energy and momentum equations coupled with a rate equation that describes both the primary and secondary pyrolysis reactions. The experiments used for the model calibration determined the yields of solid, liquid and gaseous pyrolysis products as well as their compositions at three distinct holding temperatures. Subsequently, the dynamic model was used to predict the product yields and to analyze the underlying phenomena controlling the overall pyrolysis reaction in a fixed-bed reactor.Peer reviewe
A performance optimization algorithm for controller reconfiguration in fault tolerant distributed model predictive control
This paper presents a performance optimization algorithm for controller reconfiguration in fault tol-erant distributed model predictive control for large-scale systems. After the fault has been detectedand diagnosed, several controller reconfigurations are proposed as candidate corrective actions for faultcompensation. The solution of a set of constrained optimization problems with different actuator andsetpoint reconfigurations is derived by means of an original approach, exploiting the information onthe active constraints in the non-faulty subsystems. Thus, the global optimization problem is split intotwo optimization subproblems, which enable the online computational burden to be greatly reduced.Subsequently, the performances of different candidate controller reconfigurations are compared, andthe better performing one is selected and then implemented to compensate the fault effects. Efficacyof the proposed approach has been shown by applying it to the benzene alkylation process, which is abenchmark process in distributed model predictive control.Peer reviewe
Use of upper bound delay estimate in stability analysis and robust control compensation in networked control systems
Recent interest in networked control systems (NCS) has instigated research in
various areas of both communication networks and control. The analysis of NCS
has often been performed either from the network, or the control point of view
and not many papers exist were the analysis of both is done in the same
context. Here a simple overall analysis is presented. In the paper the
procedure of obtaining the upper bound delay value in the switched Ethernet
network is proposed and the obtained delay estimate is used in stability
analysis of the feedback loop and in the control compensation. The upper bound
delay algorithm is based on the network calculus theory, the stability analysis
uses the small gain theorem, and control compensating strategy is based on
Smith predictor, where however the upper bound delay is utilised in obtaining
the delay estimate.Comment: 6 page
Control compensation based on upper bound delay in networked control systems
Recent interest in networked control systems (NCS) has instigated research in
both communication networks and control. Analysis of NCSs has usually been
performed from either the network or the control point of view, but not many
papers exist where the analysis of both is done in the same context. In this
paper an overall analysis of the networked control system is presented. First,
the procedure of obtaining the upper bound delay value for packet transmission
in the switched Ethernet network is presented. Next, the obtained delay
estimate is utilised in delay compensation for improving the Quality of
Performance (QoP) of the control systems. The presented upper bound delay
algorithm applies ideas from network calculus theory. For the improvement of
QoP, two delay compensation strategies, the Smith predictor based and the
robust control based delay compensation strategies, are presented and compared.Comment: 6 page
Intelligent control system of an industrial lime kiln process.
Abstract In the face of strong competition, the pulp and paper industry is aiming at higher pro"tability through increased productivity and the reduction of costs. In addition, on the global scale the industry is facing increasing market demands for higher product quality, more specialty products and improved production #exibility and environmental protection. Consequently, extensive research is being conducted to improve existing processes. One alternative, which is gaining increasing attention within the industry, is the improved control of existing processes by means of intelligent systems. In this paper, an intelligent kiln control system is presented. In the system, neural network models are used in conjunction with advanced high-level controllers based on fuzzy logic principles and a novel linguistic equation approach. Finally, the testing results of the system are presented and discussed
Outline of a fault diagnosis system for a large-scale board machine
Global competition forces process industries to continuously optimize plant operation. One of the latest trends for efficiency and plant availability improvement is to set up fault diagnosis and maintenance systems for online industrial use. This paper presents a methodology for developing industrial fault detection and diagnosis (FDD) systems. Since model or data-based diagnosis of all components cannot be achieved online on a large-scale basis, the focus must be narrowed down to the most likely faulty components responsible for abnormal process behavior. One of the key elements here is fault analysis. The paper describes and briefly discusses also other development phases, process decomposition, and the selection of FDD methods. The paper ends with an FDD case study of a large-scale industrial board machine including a description of the fault analysis and FDD algorithms for the resulting focus areas. Finally, the testing and validation results are presented and discussed.Peer reviewe
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