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Nonlinear state and parameter estimation of a gas-liquid cylindrical cyclone
(Chapter, 2018)— New offshore oil and gas discoveries are located at deep waters with long tie-back distances. Development of such fields require compact gas-liquid separation technologies. Efficient operation of such separators require ... -
Normalising deviance in construction project organizations a case study on the collapse of Carillion
(Peer reviewed; Journal article, 2020)In 2018, the Construction giant Carillion went into compulsory liquidation costing the UK taxpayers an estimated £148m. According to our analysis performed on the case, the demise of Carillion was the result of accumulation ... -
Normalvannmengder og deres relevans for dimensjonering av rør i 2019
(Bachelor thesis, 2019)Målet for denne rapporten er å undersøke hvorvidt normalvannmengdene gitt i Standard abonnementsvilkår for vann og avløp og NS 3055 fortsatt er relevante for dimensjonering av tappevannsannlegg i 2019. I rapporten er det ... -
Notch stress intensity factors under mixed mode loadings: An overview of recent advanced methods for rapid calculation
(Journal article; Peer reviewed, 2017)Recently some methods for the rapid calculation of notch stress intensity factors (NSIFs) have been developed and three of them are compared in this work. First, the criteria proposed by Lazzarin et al. and Treifi et al. ... -
Notch-Defect Interaction in Additively Manufactured Inconel 718
(Journal article; Peer reviewed, 2019)Powder bed fusion based additively manufactured components are known to have poor surface quality, especially when building downward facing surfaces. These surfaces can contain defects, from which fatigue cracks can be ... -
Notched Fatigue Behaviour of Additively Manufactured Inconel 718
(Master thesis, 2018)Fatigue behavior for different notch geometries of additively manufactured Inconel 718 produced by Selective Laser Melting is investigated at room temperature. Additive manufacturing enables complex geometries in components ... -
Notched graphite under multiaxial loading
(Journal article; Peer reviewed, 2017)Cylindrical specimens made of polycrystalline graphite and weakened by circumferential V-notches under mixed mode I/III loading were studied in this research. Different geometries of V-notches varying the notch opening ... -
Notched Ti-6Al-4V titanium bars under multiaxial fatigue: Synthesis of crack initiation life based on the averaged strain energy density
(Journal article; Peer reviewed, 2018)The fatigue life of notched components subjected to multiaxial loading conditions may be influenced by extrinsic mechanisms operating during crack propagation phase, such as sliding contact, friction and meshing between ... -
Notes on Computational Uncertainties in Probabilistic Risk/Safety Assessment
(Journal article; Peer reviewed, 2018)In this article, we study computational uncertainties in probabilistic risk/safety assessment resulting from the computational complexity of calculations of risk indicators. We argue that the risk analyst faces the fundamental ... -
A novel decision support system for managing predictive maintenance strategies based on machine learning approaches
(Journal article; Peer reviewed, 2022)Nowadays, the industrial environment is characterised by growing competitiveness, short response times, cost reduction and reliability of production to meet customer needs. Thus, the new industrial paradigm of Industry 4.0 ... -
Novel Impregnation System for Filament Winding
(Master thesis, 2018)A new enclosed impregnation system for the filament winding machine at NTNU has been designed and manufactured. The impregnation system concist of three main parts, the impregnation unit, resin reservoir and fixtures. The ... -
Novel in-situ residual strain measurements in additive manufacturing specimens by using the Optical Backscatter Reflectometry
(Journal article; Peer reviewed, 2020)Material extrusion (MEX) is a well established production method in additive manufacturing. However, internal residual strains are accumulated during the layer-by-layer fabrication process. They bring about shape distortions ... -
Novel Low Cost Solar Thermal Energy Concepts for Developing Countries
(Master thesis, 2017)Small scale solar thermal energy devices such as solar cookers are promising solutions for remote areas where other energy sources are limited, for instance in developing countries. These devices can be used directly for ... -
Novel method for in situ damage monitoring during ultrasonic fatigue testing by the advanced acoustic emission technique
(Peer reviewed; Journal article, 2021)Ultrasonic fatigue testing (USFT) is an effective method for the rapid characterisation of the high cycle fatigue properties of structural materials. However, the process of initiation and progression of fatigue damage ... -
Novel method for the fatigue strength assessment of heavy sections made by ductile cast iron in presence of solidification defects
(Journal article, 2018)The fatigue strength of ferritic, pearlitic, and solution strengthened ferritic ductile irons taken from heavy sections and characterized by long solidification times has been assessed. Starting from the idea of Murakami ... -
Novel risk assessment tools for the climate-induced mechanical decay of wooden structures: Empirical and machine learning approaches
(Peer reviewed; Journal article, 2022)The microclimate in which historical buildings and objects are placed strongly influences the mechanical decay and properties of the constituent materials, especially if they are susceptible to fluctuations of temperature ... -
A Novel Subspace-Aided Fault Detection Approach for the Drive Systems of Rolling Mills
(Journal article; Peer reviewed, 2021)This brief proposes a subspace-aided fault detection approach for the drive systems of strip rolling mills. Considering the impact of the unknown periodic load generated by the strip rolling process, the primary contributions ... -
Nullalternativet som ingen vil ha, men ofte ender med å få
(Journal article; Peer reviewed, 2023)Hvorfor mange samfunnsøkonomiske analyser ender med anbefaling om milliardprosjekt, som senere blir lagt på is fordi det ble for dyrt. -
Nullalternativets rolle i konseptvalgutredninger
(Concept rapport;71, Report, 2023)Rapporten ser på håndteringen av null- og nullplussalternativene i konseptvalgutredninger (KVU). Vi finner at nullalternativet ofte ikke utredes som et valgbart alternativ, men kun tas med som sammenligningsgrunnlag. Videre ... -
Numerical and Experimental Analysis of General Mixed Mode I/II/III Fracture of Polymethyl Methacrylate
(Master thesis, 2018)Mixed mode loading often has a significant effect on fracture behaviour in components. Cracks is in many cases the reason for failure or fracture of a component. All of the mechanisms of cracks and fracture behaviour are ...