| 1. |
- Theorin, Alfred, et al.
(författare)
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An Event-Driven Manufacturing Information System Architecture
- 2015
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Ingår i: 15th IFAC Symposium onInformation Control Problems inManufacturing - INCOM 2015. - : Elsevier BV. ; 48:3, s. 547-554
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Konferensbidrag (refereegranskat)abstract
- Future manufacturing systems need to be more flexible, to embrace tougher and constantly changing market demands. They also need to make better use of plant data, ideally utilizing all data from the entire plant. Low-level data should be refined to real-time information for decision making, to facilitate competitiveness through informed and timely decisions. The Line Information System Architecture, LISA, is designed to enable flexible factory integration and data utilization. In LISA, international standards and established off-the-shelf technologies have been combined with the main objective to be industrially applicable. LISA is an event-driven architecture with a prototype-oriented information model and formalized transformation services. It features loose coupling, flexibility, and ease of retrofitting legacy devices. The architecture has been evaluated on both real industrial data and industrial demonstrators and is also being installed at a large automotive company.
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| 2. |
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| 3. |
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| 4. |
- Andersson, Lennart, et al.
(författare)
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Praktikfall i reglerteknik - Råspritbränneriet i Nöbbelöv
- 1998
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- During spring 1998 the course Industrial Case Studies in Control was given at the Department of Automatic Control in Lund. The course consisted of a project at an industry with control applications. This report considers a project at the crude alcohol distillery in Nöbbelöv, where the base product for the liquor Absolut Vodka is produced. The distillery had problems with fluctuations in the concentration of ethanol in the crude alcohol. The purpose of the project was to analyze the cause of the fluctuations, and if possibly eliminate it. The fluctuations were cause by an output limiter on a controller, and were relatively easily eliminated. To examine if control performance could be further improved, a series of experiments was carried out on the plant. The result of the experiments were then used to derive a simple process model, and a suggestion for new controller parameters.
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| 5. |
- Bauer, Margret, et al.
(författare)
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What control engineers should know about industry 4.0
- 2023
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Ingår i: InTech. - 0192-303X. ; :October 2023, s. 13-23
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Tidskriftsartikel (refereegranskat)abstract
- Control engineering is a well-established discipline with a long and prominent his-tory1. It is diverse in its applications but has a strong unifying core to it: the notion ofdynamic systems and control theory. Many engineers will have encountered it as partof their education, as control engineering courses are taught to electrical, mechanical,chemical, aerospace, and industrial engineers. Quite often, though, this is the onlytime that engineers consciously encounter the subject of control systems.While control engineering is rooted in mathematical theory and tools, Industry 4.0relies on a variety of technologies. Industry 4.0 is a new and still-evolving paradigm inwhich digitalization is expected to revolutionize industry and core technologies arestill emerging. The term was coined in 2011.
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| 6. |
- Cervin, Anton, et al.
(författare)
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Återkoppling mellan lärare och studenter ur ett reglertekniskt perspektiv
- 2006
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Ingår i: 4:e Pedagogiska Inspirationskonferensen 2006. - 2003-3761 .- 2003-377X. ; 4
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Återkoppling är centralt för lärandeprocessen. Studenterna behöver få konstruktiv feedback på sina prestationer för att lärandet ska bli effektivt och lyckat. Återkoppling är även ett centralt begrepp inom reglertekniken, där man med hjälp av feedback kan få olika tekniska processer att bete sig på önskat sätt. Vi ställer oss frågan om vilka insikter man kan nå genom att analysera lärandesituationen ur ett reglertekniskt perspektiv.
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| 7. |
- Cervin, Anton, et al.
(författare)
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Återkoppling som del i lärandeprocessen
- 2006
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Ingår i: 4:e Pedagogiska Inspirationskonferensen 2006. - 2003-3761 .- 2003-377X. ; 4
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Återkoppling är centralt för lärandeprocessen. Flera aktuella rapporter har emellertid visat att studenterna vid LTH anser sig få alldeles för lite återkoppling på sina prestationer. Artikeln diskuterar olika former och metoder för återkoppling, studenternas förväntningar på mängden återkoppling samt teori kring lärande och återkoppling.
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| 8. |
- Farias, Felix, et al.
(författare)
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Key Performance Indicators for Monitoring and Evaluation of PID and APC Strategies at Manufacturing Operations Management Level in a Natural Gas Processing Unit
- 2015
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Konferensbidrag (refereegranskat)abstract
- Monitoring and control of proper Key Performance Indicators of plant performance have high correlation with business performance. So it is very important at plant-wide level to ensure that process control developments are being developed aligned with business strategy as Advanced Process Control projects have as ultimate goal to help achieving gains in this direction. The ISO 22400 “Key Performance Indicators (KPIs) for Manufacturing Operations Management” is an international standard currently under development. This new standard defines KPI as quantifiable level of achieving a critical objective derived from measurements, data and/or other key performance indicators. The common performance parameters used for assessment of PID and multivariable controllers has been discussed in literature but they don’t translate the loop performance into manufacturing operations level concepts. The Tower of stabilization is responsible for removing light components of crude oil that reaches the tabs and desalt tanks at the entrance of the plant. The operation of the tower is to ensure that the pressure of the residual steam stabilized oil output at low levels, thus decreasing its flammability and avoiding the formation of gas during storage. Due to the large number of production wells and its various operating conditions, the inlet of the plant presents high variability in terms of flow rate, composition, temperature and pressure throughout the day. In this scenario, the traditional PID control strategy does not show satisfactory performance in temperature control of the stabilization tower. This is because the PID control can not adequately handle the different feeding conditions, the high dead time inherent in the process and the adverse conditions as the arrival of PIGs. The instability of this tower leads to problems for downstream processes (as NGPUs), interfering with the profitability of the plant and the storage conditions. In this work, the advanced control strategy applied in Tower Stabilization Unit is developed and KPI for manual, PID and APC operations are determined. The advanced control employed is based on the type Predictive Process Models. Dynamic models considering supply disruptions in the tower and process response were identified. The implementation aimed to promote a low temperature variability tower, stabilizing the supply of NGPU. The predictive controller action employee can be seen in correct anticipation of control actions to prevent disturbance input promote future impact on the process conditions. It was verified that the predictive control action was effective even in extreme conditions such as PIG. These performance gains are mapped to plants KPI indexes. This paper is about selecting and using PID and APC Key Performance Indicators to help performance evaluation and comparison at plant-wide level. In this work we explain what Key Performance Indicators are suitable to use and their illustration of the impact of the new control strategies in the plant through an example of how they have been implemented in an industrial application Oil and Gas Processing Unit is presented.
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| 9. |
- Gerber, Tobias, et al.
(författare)
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Towards a seamless integration between process modeling descriptions at Business and Production levels - work in progress
- 2014
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Ingår i: Journal of Intelligent Manufacturing. - : Springer Science and Business Media LLC. - 0956-5515 .- 1572-8145. ; 25:5, s. 1089-1099
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Tidskriftsartikel (refereegranskat)abstract
- To fulfill increasing requirements in the manufacturing sector, companies are faced to several challenges. Three major challenges have been identified regarding time-to-market, vertical feedback loops and level of automation. Grafchart, a graphical language aimed for supervisory control applications, can be used from the process-planning phase, through the implementation phase and all the way to the phase for execution of the process control logics, on the lower levels of the automation triangle. This work in progress is examining if the same concepts could be used on the higher levels of the automation triangle as well. By splitting the execution engine and the visualization engine of Grafchart various different visualization tools could potentially be used, however connected by the shared Grafchart semantics. Traditional Business languages (e.g. BPMN) could therefore continue to be used for the process-planning phase whereas traditional production languages (e.g. Grafchart or other SFC-like languages) could be used for the execution. Since they are connected through the semantics, advantages regarding the three identified challenges could be achieved; time-to-market could be reduced, the time delays in the vertical feedback loops could be reduced by allowing Key Performance Indicator visualization, and the level of automation could be increased.
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| 10. |
- Gerber, Tobias, et al.
(författare)
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Towards a seamless integration between process modeling descriptions at Business and Production levels - work in progress
- 2012
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Ingår i: 14th IFAC Symposium on Information Control Problems in Manufacturing. - 9783902661982 ; , s. 1537-1542
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Konferensbidrag (refereegranskat)abstract
- To fulfill increasing requirements in the manufacturing sector, companies are faced with several challenges. Three major challenges have been identified regarding time-to-market, vertical feedback loops and level of automation. Grafchart, a graphical language aimed for supervisory control applications, can be used from the process-planning phase, through the implementation phase and all the way to the phase for execution of the process control logics, on the lower levels of the Automation triangle. Work in progress is examining if the same concepts could be used on the higher levels of the Automation triangle as well. By splitting the execution engine and the visualization engine of Grafchart various different visualization tools could potentially be used, however connected by the shared Grafchart semantics. Traditional Business languages, e.g. BPMN, could therefore continue to be used for the process-planning phase whereas traditional production languages, e.g. Grafchart or other SFC-like languages, could be used for the execution. Since they are connected through the semantics, advantages regarding the three identified challenges could be achieved; time-to-market could be reduced, the time delays in the vertical feedback loops could be reduced by allowing KPI visualization, and the level of automation could be increased.
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