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Kvarnström, Björn
Publications (10 of 16) Show all publications
Kvarnström, B. & Bergquist, B. (2012). Improving traceability in continuous processes using flow simulations (ed.). Paper presented at . Production planning & control (Print), 23(5), 396-404
Open this publication in new window or tab >>Improving traceability in continuous processes using flow simulations
2012 (English)In: Production planning & control (Print), ISSN 0953-7287, E-ISSN 1366-5871, Vol. 23, no 5, p. 396-404Article in journal (Refereed) Published
Abstract [en]

Traceability is normally difficult to achieve in continuous processes, since there are no natural batch structures. In this article, we demonstrate flow-based simulation using process data to improve traceability in a continuous pelletising process. Using the simulation model, the engineers could test the impacts of process disturbances, identify cause and effect relations and aid control in case of process disturbances. In a field trial where the chemistry of an additive was varied during production of a special product, the simulation forecasts predicted the level of the chemical content after the plant within the errors that the engineers found acceptable.

National Category
Reliability and Maintenance
Research subject
Quality Technology and Management
Identifiers
urn:nbn:se:ltu:diva-3656 (URN)10.1080/09537287.2011.561813 (DOI)000302249600004 ()2-s2.0-84858039203 (Scopus ID)17903700-d2be-11de-bae5-000ea68e967b (Local ID)17903700-d2be-11de-bae5-000ea68e967b (Archive number)17903700-d2be-11de-bae5-000ea68e967b (OAI)
Note
Validerad; 2012; 20091116 (bjokva)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Vanhatalo, E., Kvarnström, B., Bergquist, B. & Vännman, K. (2011). A method to determine transition time for experiments in dynamic processes (ed.). Paper presented at . Quality Engineering, 23(1), 30-45
Open this publication in new window or tab >>A method to determine transition time for experiments in dynamic processes
2011 (English)In: Quality Engineering, ISSN 0898-2112, E-ISSN 1532-4222, Vol. 23, no 1, p. 30-45Article in journal (Refereed) Published
Abstract [en]

Process dynamics is an important consideration during the planning phase of designed experiments in dynamic processes. After changes of experimental factors, dynamic processes undergo a transition time before reaching a new steady state. To minimize experimental time and reduce costs and for experimental design and analysis, knowledge about this transition time is important. In this article, we propose a method to analyze process dynamics and estimate the transition time by combining principal component analysis and transfer function-noise modeling or intervention analysis. We illustrate the method by estimating transition times for a planned experiment in an experimental blast furnace.

National Category
Reliability and Maintenance Probability Theory and Statistics
Research subject
Quality Technology and Management; Mathematical Statistics with special emphasis on Industrial Statistic
Identifiers
urn:nbn:se:ltu:diva-4433 (URN)10.1080/08982112.2010.495099 (DOI)000299335200004 ()2-s2.0-78649919229 (Scopus ID)26082cb0-d2bf-11de-bae5-000ea68e967b (Local ID)26082cb0-d2bf-11de-bae5-000ea68e967b (Archive number)26082cb0-d2bf-11de-bae5-000ea68e967b (OAI)
Note
Validerad; 2011; 20091116 (bjokva)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Kvarnström, B., Bergquist, B. & Vännman, K. (2011). RFID to improve traceability in continuous granular flows: an experimental case study (ed.). Quality Engineering, 23(4), 343-357
Open this publication in new window or tab >>RFID to improve traceability in continuous granular flows: an experimental case study
2011 (English)In: Quality Engineering, ISSN 0898-2112, E-ISSN 1532-4222, Vol. 23, no 4, p. 343-357Article in journal (Refereed) Published
Abstract [en]

Traceability is important for identifying the root-causes of production related quality problems. Traceability can often be reached by adding identification markers on products, but this is not a solution when the value of the individual product is much lower than the incurred cost of a marking system. This is the case for continuous production of granular media. The use of Radio Frequency Identification (RFID) technique to achieve traceability in continuous granular flows has been proposed in the literature. We study through experiments different methods to improve the performance of such an RFID system. For example, larger transponders and multiple readers are shown to improve the RFID system performance.

National Category
Reliability and Maintenance Probability Theory and Statistics
Research subject
Quality Technology & Management; Mathematical Statistics with special emphasis on Industrial Statistics
Identifiers
urn:nbn:se:ltu:diva-14093 (URN)10.1080/08982112.2011.602278 (DOI)000299336200003 ()2-s2.0-80052325697 (Scopus ID)d6937e18-da5a-40ce-a9e8-7489dfea7e88 (Local ID)d6937e18-da5a-40ce-a9e8-7489dfea7e88 (Archive number)d6937e18-da5a-40ce-a9e8-7489dfea7e88 (OAI)
Note

Validerad; 2011; 20110309 (bjarne_b)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2020-01-22Bibliographically approved
Bergquist, B. & Kvarnström, B. (2011). Tracking and tracing products in continuous processes (ed.). In: (Ed.), (Ed.), International Congress on Productivity, Quality, Reliability, Optimization and Modelling: ICPQROM 2011. Paper presented at International congress on productivity, quality, reliability, optimization and modelling : 07/02/2011 - 08/02/2011. : Indian Statistical Institute
Open this publication in new window or tab >>Tracking and tracing products in continuous processes
2011 (Swedish)In: International Congress on Productivity, Quality, Reliability, Optimization and Modelling: ICPQROM 2011, Indian Statistical Institute , 2011Conference paper, Published paper (Refereed)
Abstract [en]

Traceability is important for quality control and process improvements, but it is often difficult to track or trace products in continuous process production, since products and product lots are difficult to separate. In the past, engineers have had to rely on coarse calculations for tracing products, but new possibilities emerge as new technology and models are being used. In this paper, we present experiences from applying chemical and RFID tracers to achieve traceability in continuous flows, with examples taken from the minerals processing sector.

Place, publisher, year, edition, pages
Indian Statistical Institute, 2011
National Category
Reliability and Maintenance
Research subject
Quality Technology and Management
Identifiers
urn:nbn:se:ltu:diva-35962 (URN)ab487c84-20c8-4773-b58f-ef8d3640ed5d (Local ID)ab487c84-20c8-4773-b58f-ef8d3640ed5d (Archive number)ab487c84-20c8-4773-b58f-ef8d3640ed5d (OAI)
Conference
International congress on productivity, quality, reliability, optimization and modelling : 07/02/2011 - 08/02/2011
Note
Godkänd; 2011; 20110309 (bjarne_b)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Kvarnström, B. & Oja, J. (2010). Applications of RFID to improve traceability in continuous processes. In: Cristina Turcu (Ed.), Sustainable Radio Frequency Identification Solutions: (pp. 69-86). Paper presented at . Vienna, Austria: IN-TECH
Open this publication in new window or tab >>Applications of RFID to improve traceability in continuous processes
2010 (English)In: Sustainable Radio Frequency Identification Solutions, Vienna, Austria: IN-TECH, 2010, p. 69-86Chapter in book (Other academic)
Place, publisher, year, edition, pages
Vienna, Austria: IN-TECH, 2010
National Category
Reliability and Maintenance Other Mechanical Engineering
Research subject
Quality Technology and Management; Wood Technology
Identifiers
urn:nbn:se:ltu:diva-20997 (URN)a1ccf7b0-d2bd-11de-bae5-000ea68e967b (Local ID)978-953-7619-74-9 (ISBN)a1ccf7b0-d2bd-11de-bae5-000ea68e967b (Archive number)a1ccf7b0-d2bd-11de-bae5-000ea68e967b (OAI)
Note

Godkänd; 2010; 20091116 (bjokva)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-13Bibliographically approved
Kvarnström, B., Lindgren, T. & Ekman, J. (2010). Monte Carlo simulation of an radio frequency identification system with moving transponders using the partial element equivalent circuit method (ed.). Paper presented at . IET Microwaves, Antennas & Propagation, 4(12), 2069-2076
Open this publication in new window or tab >>Monte Carlo simulation of an radio frequency identification system with moving transponders using the partial element equivalent circuit method
2010 (English)In: IET Microwaves, Antennas & Propagation, ISSN 1751-8725, E-ISSN 1751-8733, Vol. 4, no 12, p. 2069-2076Article in journal (Refereed) Published
Abstract [en]

When designing an radio frequency identification system it is important to take both the position and the movement of the transponders into account. In this study, a simulation method that enables the description of a complete RFID system including moving and rotating transponders as well as a complex, industrial environment is presented. By using the partial element equivalent circuit method to calculate the magnetic field generated by the reader antenna and describing the transponders using a magnetic dipole, it is possible to use the Monte Carlo method to describe the dynamic behaviour of the complete system. The method is used in this study to describe the difference in performance between two different reader antennas and these results are also compared to measurements of similar systems operating in an industrial environment. The difference in performance between the two systems is similar in both the simulations and the measurements. A small discrepancy was seen between the results from the simulations and the measurements which is for the most part because of the limited read rate of the RFID systems used in the measurements.

National Category
Reliability and Maintenance Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Quality Technology and Management; Industrial Electronics
Identifiers
urn:nbn:se:ltu:diva-4776 (URN)10.1049/iet-map.2009.0414 (DOI)000285139200011 ()2-s2.0-78649927699 (Scopus ID)2c4cfb90-d2c0-11de-bae5-000ea68e967b (Local ID)2c4cfb90-d2c0-11de-bae5-000ea68e967b (Archive number)2c4cfb90-d2c0-11de-bae5-000ea68e967b (OAI)
Note
Validerad; 2011; 20091116 (bjokva)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Kvarnström, B. (2010). Traceability in continuous processes: applied to ore refinement processes (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Traceability in continuous processes: applied to ore refinement processes
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Introduction and purpose: Traceability is central for the identification of the root cause(s) behind a product deviation and thus to achieve a product and process quality that is both high and even. Continuous processes contain several characteristics complicating traceability which are not usually discussed in the scientific literature. The overall purpose of this thesis is to provide a theoretical framework for traceability and to test and develop methods for traceability in continuous processes. Design/methodology/approach: A literature review and interviews with engineers in continuous processes were performed in order to identify existing traceability theories and applications as well as characteristics complicating traceability in continuous processes. In addition, experiments evaluating traceability applications in three continuous processes were conducted at the Swedish iron ore refinement company Loussavaara Kiirunavaara AB (LKAB). Radio Frequency Identification (RFID), chemical tracer, and ideal flow simulations were, for example, used within the studied applications.Findings: A theoretical framework for traceability in continuous processes is outlined based on existing scientific literature. Several traceability methods suitable for continuous processes are described and illustrated within the framework. Furthermore, the complicating characteristics in continuous processes that each method may deal with are described. This thesis also presents and illustrates how traceability may be achieved in three continuous processes operating within ore refinement industries.Research limitations/implications: The presented research gives an insight into traceability theory and more specifically into traceability problems in continuous processes. However, the empirical results from the experiments are based on three specific processes, and research in other processes should be performed to validate the results.Practical implications: The presented results illustrate how to increase the ability to trace, track, and predict the product location in processes where traceability previously has been difficult.Originality/value: Prior research has primarily focused on discontinuous processes. By contrast, this thesis presents traceability from a continuous process perspective as well as the design and development of traceability applications for three of these processes.

Abstract [sv]

Introduktion och syfte: Spårbarhet är centralt för identifiering av rotorsaken(erna) bakom en produktavvikelse och därmed förmågan att uppnå en hög och jämn produkt- och processkvalitet. Kontinuerliga processer inrymmer ett flertal egenskaper som försvårar spårbarhet och som vanligtvis inte diskuteras i den vetenskapliga litteraturen. Det övergripande syftet med denna avhandling är att utveckla en teoretisk referensram för spårbarhet och att testa samt utveckla metoder för spårbarhet i kontinuerliga processer. Design/metod/forskningsansats: En litteraturstudie samt intervjuer med ingenjörer i kontinuerliga processer genomfördes i syfte att kartlägga befintliga spårbarhetsteorier och tillämpningar samt egenskaper som komplicerar spårbarhet i kontinuerliga processer. Dessutom utfördes experiment för att utvärdera spårbarhetsapplikationer i tre kontinuerliga processer inom det svenska järnmalmsförädlingsföretaget Loussavaara Kiirunavaara AB (LKAB). Radio Frequency Identification (RFID), kemiska spårämne och ideal flödessimuleringar är exempel på metoder som användas inom de studerade applikationerna.Resultat: En teoretisk referensram för spårbarhet i kontinuerliga processer baserad på befintlig forskningslitteratur har utvecklats. Flera spårbarhetsmetoder lämpliga för kontinuerliga processer beskrivs och illustreras inom den framtagna referensramen. Vidare beskrivs vilka komplicerande egenskaper i kontinuerliga processer som varje metod kan hantera. Denna avhandling presenterar och visar också hur spårbarhet kan uppnås i tre kontinuerliga processer som återfinns inom malmförädlingsindustrier.Forskningsbegränsningar/konsekvenser: Den presenterade forskning ger en inblick i spårbarhetsteorier och mer specifikt den spårbarhetsproblematik som återfinns i kontinuerliga processer. De empiriska resultaten från experimenten bygger dock på tre specifika processer, och fortsatt forskning kan med fördel utföras i andra processer för att validera resultaten.Praktiska konsekvenser: De presenterade resultaten visar hur man kan öka möjligheten att spåra, följa och prediktera en produkts position i processer där spårbarhet tidigare varit komplicerat.Originalitet/forskningsvärde: Tidigare forskning har främst fokuserat på diskontinuerliga processer. Denna avhandling presenterar dock spårbarhet utifrån ett kontinuerligt processperspektiv samt utvecklar och skapar spårbarhetsapplikationer för tre kontinuerliga processer.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2010. p. 66
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Reliability and Maintenance
Research subject
Quality Technology and Management
Identifiers
urn:nbn:se:ltu:diva-26677 (URN)f77760d0-dc29-11df-8b36-000ea68e967b (Local ID)978-91-7439-156-5 (ISBN)f77760d0-dc29-11df-8b36-000ea68e967b (Archive number)f77760d0-dc29-11df-8b36-000ea68e967b (OAI)
Note

Godkänd; 2010; 20101020 (bjokva); DISPUTATION Ämnesområde: Kvalitetsteknik/Quality Technology & Management Opponent: Professor Josse De Baerdemaeker, Katholieke Universiteit Leuven, Belgium Ordförande: Professor Bjarne Bergquist, Luleå tekniska universitet Tid: Onsdag den 24 november 2010, kl 13.00 Plats: D770, Luleå tekniska universitet

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-14Bibliographically approved
Bergquist, B. & Kvarnström, B. (2010). Tracing granular products using RFID (ed.). Paper presented at Bergforsk 2010 : Mineral supply - a grand challenge and opportunity : 04/05/2010 - 05/05/2010. Paper presented at Bergforsk 2010 : Mineral supply - a grand challenge and opportunity : 04/05/2010 - 05/05/2010.
Open this publication in new window or tab >>Tracing granular products using RFID
2010 (English)Conference paper, Oral presentation only (Other academic)
National Category
Reliability and Maintenance
Research subject
Quality Technology and Management
Identifiers
urn:nbn:se:ltu:diva-30135 (URN)3df20830-786b-11df-ab16-000ea68e967b (Local ID)3df20830-786b-11df-ab16-000ea68e967b (Archive number)3df20830-786b-11df-ab16-000ea68e967b (OAI)
Conference
Bergforsk 2010 : Mineral supply - a grand challenge and opportunity : 04/05/2010 - 05/05/2010
Note
Godkänd; 2010; Bibliografisk uppgift: Værtspublikationsredaktører: Göran Bäckblom Sider: 33-35; 20100615 (biem)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Kvarnström, B. & Vanhatalo, E. (2010). Using RFID to improve traceability in process industry: experiments in a distribution chain for iron ore pellets (ed.). Paper presented at . Journal of Manufacturing Technology Management, 21(1), 139-154
Open this publication in new window or tab >>Using RFID to improve traceability in process industry: experiments in a distribution chain for iron ore pellets
2010 (English)In: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786, Vol. 21, no 1, p. 139-154Article in journal (Refereed) Published
Abstract [en]

Purpose: The purpose of the article is to explore the application of Radio Frequency Identification (RFID) to improve traceability in a flow of granular products and to illustrate examples of special issues that need to be considered when using the RFID technique in a process industry setting.Design/methodology/approach: The article outlines a case study at a Swedish mining company including experiments to test the suitability of RFID to trace iron ore pellets (a granular product) in parts of the distribution chain.Findings: The results show that the RFID technique can be used to improve traceability in granular product flows. A number of special issues concerning the use of RFID in process industries are also highlighted, for example, the problems to control the orientation of the transponder in the read area and the risk of product contamination in the supply chain.Research limitations/implications: Even though only a single case has been studied, the results are of a general interest for industries that have granular product flows. However, future research in other industries should be performed to validate the results.Practical implications: The application of RFID described in this article makes it possible to increase productivity and product quality by improving traceability in product flows where traceability normally is problematic. Originality/value: Prior research has mainly focused on RFID applications in discontinuous processes. By contrast, this article presents a novel application of the RFID technique in a continuous process together with specific issues connected to the use of RFID.

National Category
Reliability and Maintenance
Research subject
Quality Technology and Management
Identifiers
urn:nbn:se:ltu:diva-14731 (URN)10.1108/17410381011011524 (DOI)2-s2.0-75649119297 (Scopus ID)e25b82e0-6c5d-11de-9f57-000ea68e967b (Local ID)e25b82e0-6c5d-11de-9f57-000ea68e967b (Archive number)e25b82e0-6c5d-11de-9f57-000ea68e967b (OAI)
Note
Validerad; 2010; 20090709 (eri_van)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Vanhatalo, E., Kvarnström, B., Bergquist, B. & Vännman, K. (2009). A method to determine transition time for experiments in dynamic processes (ed.). Paper presented at ENBIS Goteborg : 20/09/2009 - 24/09/2009. Paper presented at ENBIS Goteborg : 20/09/2009 - 24/09/2009.
Open this publication in new window or tab >>A method to determine transition time for experiments in dynamic processes
2009 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Planning, conducting, and analyzing experiments performed in dynamic processes, such as continuous processes, highlight issues that the experimenter needs to consider, for example, process dynamics (inertia) and the multitude of responses. Dynamic systems exhibit a delay (transition time) the change of an experimental factor and when the response is affected. The transition time affects the required length of each experimental run in dynamic processes and long transition times may call for restrictions of the randomization of runs. By contrast, in many processes in parts production this change is almost immediate. Knowledge about the transition time helps the experimenter to avoid experimental runs that are either too short for a new steady-state to be reached, and thus incorrect estimation of treatment effects, or unnecessarily long and costly. Furthermore, knowing the transition time is important during analysis of the experiment.Determining the transition time in a dynamic process can be difficult since the processes often are heavily instrumented with a multitude of responses. The process responses are typically correlated and react to the same underlying events. Hence, multivariate statistical tools such as principal component analysis (PCA) are often beneficial during analysis. Furthermore, the responses are often highly positively autocorrelated due to frequent sampling. We propose a method to determine the transition time between experimental runs in a dynamic process. We use PCA to summarize the systematic variation in a multivariate response space. The time series analysis techniques ‘transfer function-noise modeling' or ‘intervention analysis' are then used to model the dynamic relation between an input time series event and output time series response using the principal component scores. We illustrate the method by estimating the transition time for treatment changes in an experimental blast furnace. This knowledge provides valuable input to the planning and analysis phase of the experiments in the process.

National Category
Reliability and Maintenance Probability Theory and Statistics
Research subject
Quality Technology and Management; Mathematical Statistics with special emphasis on Industrial Statistic
Identifiers
urn:nbn:se:ltu:diva-29958 (URN)399419b0-e499-11de-bae5-000ea68e967b (Local ID)399419b0-e499-11de-bae5-000ea68e967b (Archive number)399419b0-e499-11de-bae5-000ea68e967b (OAI)
Conference
ENBIS Goteborg : 20/09/2009 - 24/09/2009
Note
Godkänd; 2009; 20091209 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-26Bibliographically approved
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