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  • Theorin, A., et al. (författare)
  • An event-driven manufacturing information system architecture for Industry 4.0
  • 2017
  • Ingår i: International Journal of Production Research. - Taylor & Francis. - 0020-7543. ; 55:5, s. 1297-1311
  • Tidskriftsartikel (refereegranskat)abstract
    • Future manufacturing systems need to be more flexible, to embrace tougher and constantly changing market demands. They need to make better use of plant data, ideally utilising all data from the entire plant. Low-level data should be refined toreal-time information for decision-making, to facilitate competitiveness through informed and timely decisions. The Line Information System Architecture (LISA), is presented in this paper. It is an event-driven architecture featuring loose coupling,a prototype-oriented information model and formalised transformation services. LISA is designed to enable flexible factory integration and data utilisation. The focus of LISAis on integration of devices and services on all levels, simplifying hardwarechanges and integration of new smart services as well as supporting continuous improvements on information visualisation and control. The architecture has been evaluated on both real industrial data and industrial demonstrators and it is also beinginstalled at a large automotive company. This article is an extended and revised version of the paper presented at the 2015 IFAC Symposium on Information Control in Manufacturing (INCOM 2015). The paper has been restructured in regards tothe order and title of the chapters, and additional information about the integration between devices and services aspects have been added. The introduction and the general structure of the paper now better highlight the contributions of the paper andthe uniqueness of the framework.
  • Chen, Zhe, et al. (författare)
  • Nano-scale characterization of white layer in broached Inconel 718
  • 2017
  • Ingår i: Materials Science & Engineering : A. - Amsterdam : Elsevier. - 0921-5093. ; 684, s. 373-384
  • Tidskriftsartikel (refereegranskat)abstract
    • The formation mechanism of white layers during broaching and their mechanical properties are not well investigated and understood to date. In the present study, multiple advanced characterization techniques with nano-scale resolution, including transmission electron microscopy (TEM), transmission Kikuchi diffraction (TKD), atom probe tomography (APT) as well as nano-indentation, have been used to systematically examine the microstructural evolution and corresponding mechanical properties of a surface white layer formed when broaching the nickel-based superalloy Inconel 718.TEM observations showed that the broached white layer consists of nano-sized grains, mostly in the range of 20–50 nm. The crystallographic texture detected by TKD further revealed that the refined microstructure is primarily caused by strong shear deformation. Co-located Al-rich and Nb-rich fine clusters have been identified by APT, which are most likely to be γ′ and γ′′ clusters in a form of co-precipitates, where the clusters showed elongated and aligned appearance associated with the severe shearing history. The microstructural characteristics and crystallography of the broached white layer suggest that it was essentially formed by adiabatic shear localization in which the dominant metallurgical process is rotational dynamic recrystallization based on mechanically-driven subgrain rotations. The grain refinement within the white layer led to an increase of the surface nano-hardness by 14% and a reduction in elastic modulus by nearly 10% compared to that of the bulk material. This is primarily due to the greatly increased volume fraction of grain boundaries, when the grain size was reduced down to the nanoscale.
  • Sanati, Mehri, et al. (författare)
  • Nanoparticles for long-term stable, more selective MISiCFET gas sensors
  • 2005
  • Ingår i: Sensors and Actuators B. - 0925-4005. ; 107:2, s. 831-838
  • Tidskriftsartikel (refereegranskat)abstract
    • Synthesis of metal-oxide nanoparticles and utilization of these particles as gate materials for field-effect sensor devices is reported. Improved selectivity to specific gases is expected by modulating the size of the oxide nanoparticles or impregnating them with catalytic metals. Another objective is to improve the long-term thermal stability of the sensors, since the metal loaded nanoparticles may prevent thermally induced restructuring of the gate layer, which is often a problematic issue for the catalytic metal layers. Because of its reasonably high electrical conductivity, which is especially important for the capacitive gas sensors, ruthenium dioxide has been identified to be one of the potential candidates as gate material for the field-effect sensor devices. Interestingly, this material has been found to change its resistivity in different gaseous ambients. When used as a gate material, sensitivity to reducing gases has been observed for the RuO2/SiO2/4H-SiC capacitors. Changes in the resistivity of the films due to various gas exposures have also been recorded. Morphological studies of nanoparticles (SiO2 and Al2O3), loaded or impregnated with catalytic metals (e.g. Pt), have been performed.
  • Gharehbaghi, Arash, et al. (författare)
  • Detection of systolic ejection click using time growing neural network
  • 2014
  • Ingår i: Medical Engineering and Physics. - Elsevier. - 1350-4533. ; 36:4, s. 477-483
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, we present a novel neural network for classification of short-duration heart sounds: the time growing neural network (TGNN). The input to the network is the spectral power in adjacent frequency bands as computed in time windows of growing length. Children with heart systolic ejection click (SEC) and normal children are the two groups subjected to analysis. The performance of the TGNN is compared to that of a time delay neural network (TDNN) and a multi-layer perceptron (MLP), using training and test datasets of similar sizes with a total of 614 normal and abnormal cardiac cycles. From the test dataset, the classification rate/sensitivity is found to be 97.0%/98.1% for the TGNN, 85.1%/76.4% for the TDNN, and 92.7%/85.7% for the MLP. The results show that the TGNN performs better than do TDNN and MLP when frequency band power is used as classifier input. The performance of TGNN is also found to exhibit better immunity to noise.
  • Bertoni, M., et al. (författare)
  • The Rise of Social Product Development
  • 2012
  • Ingår i: International Journal of Networking and Virtual Organisations. - Inderscience. - 1741-5225. ; 11:2, s. 188-207
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of the paper is to discuss the rising potential of social software to increase the knowledge management capabilities of virtual product development teams. It presents six fundamental transitions, elaborated from the empirical findings, which justify the rise of a more bottom-up, social creation and sharing of engineering knowledge in the virtual organisation. The study suggests that traditional engineering knowledge management approaches alone are not sufficient to support development activities in the virtual organisation, and that such teams display an increasing demand for social, comparatively lightweight and remixable platforms for bottom-up, social creation and sharing of knowledge.
  • Chirumalla, Koteshwar, et al. (författare)
  • Knowledge Sharing Across Boundaries:Web 2.0 and Product-Service System Development
  • 2011
  • Konferensbidrag (refereegranskat)abstract
    • Under senare år har det funnits ett växande intresse bland organisationer som arbetar med produktutveckling att utnyttja sin tekniska kunskap som huvudsaklig konkurrensfördel för innovation. Fånga, lagra, hämta, dela och återanvändning av kunskap från en rad olika affärssystem har blivit avgörande aktiviteter när det gäller kunskapshantering. Mot bakgrund av en föränderlig och dynamiskt företag miljö, samt en övergång till Product-Service System (PSS) utveckling, diskuterar denna artikel några av begränsningarna för dagens affärssystem beträffande återanvändning av ingenjörskunnande över funktionella samt företagens gränser. Vidare visar artikeln på hur Web 2.0-baserade samarbetsprojekt kan utnyttja tvärfunktionellkunskap för nya PSS utvecklingsprojekt, genom ett öppet, “bottom-up”, och kollektivt “sense-making” förhållningssätt till kunskapshantering.
  • Zambrano, Jesús, et al. (författare)
  • Optimal steady-state design of zone volumes of bioreactors with Monod growth kinetics
  • 2015
  • Ingår i: Biochemical Engineering Journal. - The Association for the Study of Animal Behaviour / Elsevier B.V.. - 1369-703X. ; 100, s. 59-66
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper deals with steady-state analysis and design of bioreactors consisting of a number of completely stirred tank reactors (CSTRs) in series. The study is confined to one consumed (substrate) and one consuming constituent (biomass). The specific microbial growth rate is assumed to be described by Monod kinetics. The death of biomass is assumed to be negligible. Two optimal design problems for a large number of CSTRs in series are studied: to minimize the effluent substrate concentration for a given total volume, and to minimize the total volume for a given effluent substrate concentration. As an appealing alternative to solve these problems numerically, it is proposed to consider the asymptotic case where the number of CSTRs tends to infinity. This is shown to correspond to one CSTR in series with a plug flow reactor (PFR). A CSTR with a sufficient large volume is needed to avoid wash-out of the biomass. The main result is that both design problems for the CSTR + PFR configuration have the same solution with respect to the optimal volume of the CSTR, which is given as an explicit function of the incoming substrate concentration, the volumetric flow rate and the coefficients of the Monod growth rate function. Numerical results indicate that the plug flow approach may be used as a feasible design procedure even for a reasonably low number of CSTRs in series.
  • Holmqvist, A., et al. (författare)
  • Dynamic parameter estimation of atomic layer deposition kinetics applied to in situ quartz crystal microbalance diagnostics
  • 2014
  • Ingår i: Chemical Engineering Science. - Elsevier. - 0009-2509. ; 111, s. 15-33
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents the elaboration of an experimentally validated model of a continuous cross-flow atomic layer deposition (ALD) reactor with temporally separated precursor pulsing encoded in the Modelica language. For the experimental validation of the model, in situ quartz crystal microbalance (QCM) diagnostics was used to yield submonolayer resolution of mass deposition resulting from thin film growth of ZnO from Zn(C2H5)2 and H2O precursors. The ZnO ALD reaction intrinsic kinetic mechanism that was developed accounted for the temporal evolution of the equilibrium fractional surface concentrations of precursor adducts and their transition states for each half-reaction. This mechanism was incorporated into a rigorous model of reactor transport, which comprises isothermal compressible equations for the conservation of mass, momentum and gas-phase species. The physically based model in this way relates the local partial pressures of precursors to the dynamic composition of the growth surface, and ultimately governs the accumulated mass trajectory at the QCM sensor. Quantitative rate information can then be extracted by means of dynamic parameter estimation. The continuous operation of the reactor is described by limit-cycle dynamic solutions and numerically computed using Radau collocation schemes and solved using CasADi's interface to IPOPT. Model predictions of the transient mass gain per unit area of exposed surface QCM sensor, resolved at a single pulse sequence, were in good agreement with experimental data under a wide range of operating conditions. An important property of the limit-cycle solution procedure is that it enables the systematic approach to analyze the dynamic nature of the growth surface composition as a function of process operating parameters. Especially, the dependency of the film growth rate per limit-cycle on the half-cycle precursor exposure dose and the process temperature was thoroughly assessed and the difference between ALD in saturating and in non-saturating film growth conditions distinguished.
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