Forthcoming and Online First Articles

International Journal of Product Lifecycle Management

International Journal of Product Lifecycle Management (IJPLM)

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International Journal of Product Lifecycle Management (5 papers in press)

Regular Issues

  • Digital maturity models: Comparing manual and semi-automatic similarity assessment frameworks   Order a copy of this article
    by Bruno COGNET, Jean-Philippe PERNOT, Louis RIVEST, Christophe DANJOU 
    Abstract: The fourth industrial revolution is forcing companies to define their digital strategy, making it imperative that they assess their digital maturity as a basis for improvements. As a result, there is a variety of maturity models available in the literature. However, it can be difficult to identify which one is most appropriate, and so some assessment is required before selecting a maturity model. This paper assesses the similarity of two maturity models by identifying the correspondence between the Key Performance Indicators (KPIs) used by these maturity models. To accomplish this task, this paper introduces a new methodology to compare a manual and a semi-automatic frameworks for assessing the similarity of digital maturity models. This new methodology should make it possible to select the most adequate framework for comparing the current maturity models. Both frameworks have been designed to identify correspondences between KPIs. The analysis of the matches and the results obtained by following the two similarity assessment frameworks are then used to tune the semi-automatic framework. The proposed comparison methodology has been validated using two digital maturity models and shows that the semi-automatic framework provides good results in a very efficient manner. Several insights have been derived and will help to develop a new maturity model.
    Keywords: Industry 4.0; smart manufacturing; digitalization; maturity models; comparison framework; semi-automatic comparison; similarity assessment.

  • Development of a framework for operational phase life assessment of machine tools using a structural approach   Order a copy of this article
    by Kumar Sarthak, Girish Kumar, Ajith Tom James, Umang Soni, Mohammad Asjad 
    Abstract: The life assessment of machine tools during operational phase is essential for ensuring the design robustness as well as scheduling of maintenance activities, fixing warranty period and disposal decisions. To accomplish this, the factors influencing it are singled out. The operational life factors, including their interrelations are modeled, taking into consideration of their structure using graph theory. Operational life digraph for the machine tools is defined, whose nodes represent operational life factors, whereas the edges depict their degree of mutual influence. A matrix equivalent of the digraph provides machine tool operational life function (MTOLF) that characterizes machine tool life, leading to the development of operational life index (OLI). Its higher value indicates that the machine tool has high life expectancy with the existing design under given operating conditions. Moreover, an operational life index ratio (OLIR) is also proposed to compare the operational life of an actual machine with an ideal one. An illustration of operational life assessment of two CNC (Computer Numerical Controlled) turning centers of same capacity, but of different makes is provided using proposed methodology as an experimental application. The Operational Life Index Ratio (OLIR) of the two CNC turning centers are estimated as 0.448 and 0.539, which are considered as lesser than the expected value of 1, that indicates a scope for further improvement at the operational stage. The methodology proposed is conducive to assess and correlate design alternatives of machine tools that work in the same operating conditions and have similar specifications. This can also help the users of machine tools to improve the operating conditions to enhance the machine tool life.
    Keywords: Machine tool; operational life factors; operational life index; structural approach; digraph model.

  • Holistic Definition of the Digital Twin   Order a copy of this article
    by Martin Eigner, Alexander Detzner, Philipp Heiner Schmidt, Rajeeth Tharma 
    Abstract: Service-oriented business models become a key factor for business success and pave the way from the Internet of Things to the Internet of Services. The technological basis for these concepts are the Digital Model, the Digital Thread and the Digital Twin. From the digital model, often called the "150% model", an individual product is generated by customer- or order-specific instantiation. This is the core of the Digital Twin, which is enriched over the entire product life cycle, i.e. in development, production and later during operation via behavioral analyses, simulations and operating data. This paper presents definition of the Digital Twins developed over several research projects, as well as its derivation and management in a Product Lifecycle Management (PLM) environment.
    Keywords: PLM; Digital Twin; Digital Model; Digital Thread.

  • Reliability-oriented life extension of mechatronic products: theory and application   Order a copy of this article
    by Laudelino Vieira De Matos Filho, Rodrigo Bastos Fernandes, Victor Juliano De Negri, Michail Papoutsidakis, Antonio Carlos Valdiero 
    Abstract: Mechatronic systems comprise physical parts, as well as digital electronics commanded by software. These devices are envisioned to provide functionalities with control, increase operational efficiency, and provide flexibility. When operational efficiency, cost, and security are no longer satisfactory, retrofitting and updating are alternatives. Yet, system alterations may impact its reliability, which can be increased to justify any investment. Therefore, an adaptation of the product development process was proposed to guide designers in life-extending mechatronic products. It encompasses reverse engineering principles and makes use of logic diagrams to support the reliability modelling used to upgrading and updating the decision-making process. The proposed process was applied to a 20 years old hydraulic power and conditioning unit, through which it was possible to identify the components that presented the highest impact on the system life expectancy and failure frequency. New concepts were proposed and modifications were performed, which resulted in a more precise and reliable system.
    Keywords: mechatronic product; reliability; product design; life extension; retrofitting; product update; product upgrade.

  • Product BOMs in different lifecycle contexts managed by a PLM system as a requirement for implementing digital twins   Order a copy of this article
    by Darli Vieira, Eduardo Schmoller, Alencar Bravo 
    Abstract: This work is based on a real case of digital twin implementation in one of the largest global mining companies; this firm was aiming to improve maintenance planning and management. The object studied is a subsystem of a car dumper, a critical piece of equipment in mining. This work concludes that without digital product BOMs (bills of materials) managed by a PLM (product lifecycle management) system, it is not possible to institutionalize the digital twin in a company, and it illustrates a practical application of PLM system integration into CAD (computer-aided design) software. The BOMs are a requirement for implementing digital twins and provide the basis for the connection between the real and virtual worlds; they are the coalescent product structure for information registration and exchange. This work demonstrates that representative data related to digital product BOMs managed by a PLM system are the foundation for improving maintenance management in mining companies and that BOMs are a requirement for implementing digital twins.
    Keywords: digital twin; maintenance planning; operational assets; BOM; PLM system; software integration; CAD software.