Identification of process bottlenecks with global sensitivity analysis, an application to papermaking processes

Savolainen, Jouni; Lappalainen, Jari

doi:10.3183/npprj-2015-30-03-p393-401

Cited by 2 publications

(2 citation statements)

References 67 publications

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“…The answer might be sensitivity analyses, discussed in detail in Section 5. Sensitivity analysis is an effective way to detect bottlenecks, examples can be examined in Savolainen and Lappalainen (2015) and Lei and Li (2017). Cheng (1993) emphasized that the effectiveness of policies for future can be examined by sensitivity analysis in scope of OR in Higher Education Administration.…”

Section: Sustainability Of Examination Policiesmentioning

confidence: 99%

Use of multi-objective examination model to sensitivity analysis for sustainability with three new practices

Şimşek

2022

JM2

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Purpose The study has two main objectives. The first is to introduce three new examination policy practices: overbooked exam rooms, a substitute invigilator and an inheritance of the invigilation distribution. The second is the use of the examination model to determine the sustainability of the system against expected changes and to obtain long-term strategic information. This study aims to obtain managerial insights on the sustainability of the examination system with the newly introduced practices; it does not claim to propose solutions for large-scale problems. Design/methodology/approach This study introduces a multi-objective mathematical model that contains a couple of constraints that belong to new practices. To check the sustainability of the system, this study gets help from sensitivity analysis, which informs the decision-maker about how the results will react to parameter changes. The authors perform all experiments in the Python/Gurobi modeling environment. Findings The results demonstrate that the proposed practices are effective in the efficient use of resources. Also, this study shows that the examination model can be used as a stress test so that the weaknesses of the system can be identified and long-term strategic information can be obtained. Originality/value The contribution of this study is twofold: the introduction of examination policy practices that are overbooked exam rooms, a substitute invigilator and an inheritance of the invigilation distribution. Overbooked exam rooms aim to use resources effectively, taking into account the possibility of temporarily increasing the exam room capacity. The substitute invigilator protects the examination process against sudden events. The inheritance of the invigilation distribution helps to ensure fairness; and the use of the examination model to obtain managerial insights on expectations. This allows testing the validity of existing policies and making necessary changes, taking into account possible changes in the system. In this respect, it differs from the studies in the literature and fills an important managerial gap.

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Section: Sustainability Of Examination Policiesmentioning

confidence: 99%

Use of multi-objective examination model to sensitivity analysis for sustainability with three new practices

Şimşek

2022

JM2

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“…Although many studies have focused on dynamic simulation and paper machines, only a few approaches to the dynamics of a paper machine at an industrial scale are available (Blanco et al 2009). These have focused on the transient behavior of wet-end (Orccotoma et al 1997;Yeo et al 2004), the improvement of fault detection (Cheng et al 2008), and the identification of process bottlenecks (Savolainen and Lappalainen 2015). Several software packages exist for flowsheet-based mass balance calculations.…”

Section: Introductionmentioning

confidence: 99%

Process simulation-based evaluation of design and operational implications of water-laid paper machine conversion to foam technology

Sorsamäki

Koponen

Hytönen

2021

BioRes

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Foam forming technology has attracted much attention during the past few years in the paper industry. Its advantages compared to conventional water forming are a new product portfolio and increased process efficiency. To support the paper industry in pushing foam forming technology forward, process simulation is needed to provide supporting data for strategic decision-making and as a basis for equipment dimensioning. This study examined the conversion of an existing wallpaper machine from water to foam forming technology using process simulation. To determine the required process configuration and parameter changes in the existing process, both published and unpublished data on the foam forming process were collected. This paper also describes modeling of the foam phase in the selected simulation software. The suitability of existing paper process equipment for foam was analyzed. Simulations revealed that undisturbed operation with foam requires some equipment modifications and re-arrangements in water circuits. With foam forming, the water balance in both short and long circulation changes remarkably compared to conventional water forming, leading to a large increase in the long circulation volume flows.

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Identification of process bottlenecks with global sensitivity analysis, an application to papermaking processes

Cited by 2 publications

References 67 publications

Use of multi-objective examination model to sensitivity analysis for sustainability with three new practices

Use of multi-objective examination model to sensitivity analysis for sustainability with three new practices

Process simulation-based evaluation of design and operational implications of water-laid paper machine conversion to foam technology

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