When principal component analysis (PCA) is used for statistical process monitoring it relies on the assumption that data are time independent. However, industrial will often exhibit serial correlation. Dynamic PCA (DPCA) has been suggested as a remedy high-dimensional and time-dependent data. In DPCA input matrix augmented by adding time-lagged values of variables. building model analyst needs to decide (1) number lags add, (2) given specific lag structure, how many components retain. this...

Abstract Purpose – The purpose of this paper is to discuss the ongoing development quality management, and whether concepts being discussed can be agreed what influence might have on movement practice. Design/methodology/approach Literature review meta‐analysis current trends has been used create a conceptual basis for management questions. Findings A large part concept taken place without much consideration really or should be. Over time their definitions widened incorporate wellbeing...

Purpose The purpose of this paper is to identify and explore important quality-related challenges facing organizations, investigate how current excellence models incorporate these challenges. Design/methodology/approach based on a Delphi study Swedish organizations. Forty-nine were generated ranked according importance the ten top-ranked compared principles four models. Findings still seem be relevant since their content matches many identified Malcolm Baldrige National Quality Award...

Quality management (QM) has shown an impressive ability to update and evolve. The purpose of this paper is highlight themes that have been identified as vital important for research projects within QM during the coming decade. also attempt initiate emerging 2030 agenda QM, here referred 'Quality 2030'. This article based on extensive data gathered a workshop process conducted in two main steps: (1) collaborative brainstorming with 22 researchers practitioners (spring 2019) (2) appreciative...

For decades now TQM has been a dominant management concept for improving competitiveness and financial results. In recent years, however, seems to have lost some of its nimbus with other concepts approaches such as Lean Enterprise Six Sigma launched increasingly in vogue. The aim this paper is look at Sigma, their backgrounds, definitions ingredients, similarities differences see whether the two really are different dishes or contain same ingredients proportions.

Condition assessment is crucial to optimize condition-based maintenance actions of assets such as railway infrastructure, where a faulty state might have severe consequences. Hence, railways are regularly inspected detect failure events and prevent the item (e.g. rail) reach with potentially safety critical consequences derailment). However, preventive measures maintenance) initiated by inspection results may cause traffic disturbances, especially if expected time short. The alarm limits...

This article illustrates a method to measure, visualize, and statistically test tamping effectiveness on track geometry using comparing two different measurement systems: an onboard system mounted regular passenger train specialized system. The proposed analysis can be generalized assess the impact of other maintenance activities. Track quality variables, such as longitudinal level, were measured effects 1250 m section Swedish Iron Ore Line in autumn 2022. provided frequent measurements...

Engineering process control and high-dimensional, time-dependent data present great methodological challenges when applying statistical (SPC) design of experiments (DoE) in continuous industrial processes. Process simulators with an ability to mimic these are instrumental research education. This article focuses on the revised Tennessee Eastman simulator providing guidelines for its use as a testbed SPC DoE methods. We provide flowcharts that can support new users get started Simulink/Matlab...

The accuracy of the measurement system is vital for reliable process monitoring using statistical control charts. applied chart's effectiveness depends on system's performance. Measurement uncertainty can lead to incorrect decisions like unnecessary stops or failure intervene. In this paper, we investigated effect errors performance four well-established combined charts mean normally distributed processes: Shewhart-CUSUM, Shewhart-Crosier's CUSUM, Shewhart-EWMA and Shewhart-GWMA To deal with...

Abstract Timely planning and scheduling of railway infrastructure maintenance interventions are crucial for increased safety, improved availability, reduced cost. We propose a data‐driven decision‐support framework integrating track condition predictions with tactical operational scheduling. The acknowledges prediction uncertainties by using Wiener process‐based model at the level. also develop algorithms One algorithm focuses on cost‐optimisation, one considers multi‐component...

Purpose – The purpose of this paper is to summarize previously reported benefits, drawbacks and important aspects for implementation performance-based logistics (PBL), identify knowledge gaps. Design/methodology/approach This a literature review based on 101 articles. reviewed articles are relevant PBL in particular, but also performance contracting, product-service systems (PSS) servitization general. research method involved database searches, filtering results reviewing publications....

Purpose Total quality management has seen a tremendous rise of popularity in the 1980s and 1990s. Aims to question effectiveness, utility use TQM among many people – practitioners, as well academics. Design/methodology/approach Discusses lack common interpretations based on literature study. The answer whether is marvel or malpractice depends several factors, for instance, what kinds organizations applied, interpretation made, input theorists practitioners have, i.e. their earlier...

Process industries often have features that differ from other businesses, such as round-the-clock production and costly specialized processes—features not been dealt with in the project management literature. We highlight identify complexity of R&D projects Swedish process industry its interrelated development product activities based on results interviews a case study. The different competence areas which manager must integrate manage is illustrated. conclude needs both product-related...

Purpose The purpose of this paper is to present a study how Six Sigma influences job satisfaction among employees at three large companies with manufacturing units in Sweden that have used different implementation strategies. Design/methodology/approach was performed using survey distributed those affected by the company sites, including not directly involved any activities. Findings Employees participating feel positive changes many aspects satisfaction. Black Belts (BBs) felt, on average,...

ABSTRACT This article proposes a Bayesian procedure to calculate posterior probabilities of active effects for unreplicated two-level factorials. The results from literature survey are used specify individual prior the activity and then calculated in three-step where principles sparsity, hierarchy, heredity successively considered. We illustrate our approach by reanalyzing experiments found literature.

Abstract Students taking courses in quality management at Luleå University of Technology receive extensive education statistical methods. To improve the and to understand what kind competence students need when they graduate, a survey was preformed examining how extent methods Statistical Process Control, Capability Analysis Design Experiments are used by organisations hiring alumni. The result shows that employed Swedish industrial sector witness modest use methods, while other sectors...

ABSTRACT Discontinuous processes dominate experimental applications in practice as well literature. Continuous constitute a significant part of goods production, and the need to gain knowledge using experiments are relevant such environments in, for example, parts production. We argue that characteristics continuous affect prerequisites efforts an extent they special attention. To describe considerations when planning process, performed blast furnace process studied. propose tentative list...

ABSTRACT Traceability is important for identifying the root causes of production-related quality problems. can often be reached by adding identification markers on products, but this not a solution when value individual product much lower than incurred cost marking system. This case continuous production granular media. The use radio frequency (RFID) techniques to achieve traceability in flows has been proposed literature. We study through experiments different methods improve performance...

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 improve traceability a pelletising process. Using the model, engineers could test impacts of disturbances, identify cause and effect relations aid control case disturbances. field trial where chemistry an additive was varied during production special product, forecasts predicted level chemical content...

AbstractAbstractThe large undercooling and rapid quenching that can occur during multistage atomisation are studied both theoretically experimentally. Results show these two effects closely related to promoted by each other. The level of for droplets is dependent on alloy composition, powder particle size, condition. cooling rates depend heavily their size. Both experiments theoretical analysis Sn-Pb alloys reveal a certain function has linear relationship with the logarithm mean Based...

Abstract This paper describes a joint project started by citizens, trade life and local government of the Swedish municipality Jokkmokk to create positive societal development based on tenets Total Quality Management. The had duration two years, also included parallel effort made in Mansfield United Kingdom, although this part project. evaluation was surveys interviews analysed using Soft Systems Methodology. analysis shows that most respondents thought successful changing attitudes people...

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