Browsing NTNU Open by Title
Now showing items 65582-65601 of 103765
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Non-Linear Model Predictive Control for Modular Multilevel Converters
(Chapter, 2022)In this paper, non-linear model predictive control (NMPC) without an explicit modulator is applied to modular multilevel converters (MMCs) in the abc reference frame. NMPC can easily be extended for longer prediction ... -
Non-linear Newton Solver for a Polymer Two-phase System Using Interface-localized Trust Regions
(Chapter, 2017)Models of polymer flooding account for several processes such as concentration dependent viscosity, adsorption, incomplete mixing, inaccessible pore space, and reduced permeability effects, which altogether gives strongly ... -
Non-linear Observers for GNSS- and Camera-Aided Inertial Navigation of a Fixed-Wing UAV
(Journal article; Peer reviewed, 2017)In this paper, exponentially stable nonlinear observers for the estimation of position, velocity, specific force, attitude, and gyro bias of a fixed-wing unmanned aerial vehicle (UAV) are proposed. The sensor suite consists ... -
Non-linear optical microscopy as a novel quantitative and label-free imaging modality to improve the assessment of tissue-engineered cartilage
(Journal article; Peer reviewed, 2017)Objective Current systems to evaluate outcomes from tissue-engineered cartilage (TEC) are sub-optimal. The main purpose of our study was to demonstrate the use of second harmonic generation (SHG) microscopy as a novel ... -
Non-linear optical microscopy of cartilage canals in the distal femur of young pigs may reveal the cause of articular osteochondrosis
(Journal article; Peer reviewed, 2017)Background Articular osteochondrosis is a common cause of leg weakness in pigs and is defined as a focal delay in the endochondral ossification of the epiphysis. The first demonstrated steps in the pathogenesis consist ... -
Non-linear path following and data-driven applications in underwater snake robot control
(Master thesis, 2024)Ledsvømmere, som slangeroboter og fiskeroboter, representerer en spennende nyutvikling innen robotikk. De opererer i komplekse hydrodynamiske miljøer, og har ofte i oppgave å løse utfordrende kontrollproblemer med tilgang ... -
Non-linear Response in Reinforced Concrete related to Cryogenic Conditions
(Master thesis, 2014)A reinforced outer concrete containment tank exposed for liquefied natural gas was the basis for this study. The containment tank was analysed both linearly and non-linearly by use of two different finite element programs; ... -
Non-linear rheology and direct numerical simulation of pressure propagation in gel
(Dr. ingeniøravhandling, 0809-103X; 2014:175, Doctoral thesis, 2014)Complex fluids are expected to demonstrate rheological behavior intermediate between solids (completely elastic) and fluids (completely viscous). However, despite abundant existence of complex fluids their rheological ... -
NON-LINEAR SOIL MODELS FOR PIPELINE AND RISER ANALYSIS
(Master thesis, 2015)This thesis describes the development and application of non-linear soil models in pipeline and riser design. A non-linear soil model is typically employed when investigating a complex pipe-soil interaction problem. Two ... -
Non-linear time domain analysis of cross-flow vortex-induced vibrations
(Journal article; Peer reviewed, 2017)A previously proposed hydrodynamic load model for time domain simulation of cross-flow vortex-induced vibrations (VIV) is modified and combined with Morison's equation. The resulting model includes added mass, drag and a ... -
Non-Linear Time Domain Analysis of Deepwater Riser Vortex-Induced Vibrations
(Doctoral theses at NTNU;2022:178, Doctoral thesis, 2022)Fatigue analysis of marine risers due to vortex-induced vibrations (VIV) is normally based on semi-empirical frequency domain methods which only allow for linear structural models, excluding non-linear effects (e.g., tension ... -
Non-linear time domain analysis of vortex induced vibrations
(Master thesis, 2015)In this thesis a model for nonlinear analysis of vortex induced vibrations (VIV), applied to free spanning pipelines, is proposed. The developed model takes into account the soil-pipe interaction. Through case studies, ... -
Non-linear Unemployment Effects in Sickness Absence: Discipline or Composition Effects?
(Working Paper Series, 1503-299X; 2002:25, Research report, 2002)By applying Smooth Transition Regressions (Teräsvirta, 1998) we test whether effects on short (STA) and long term (LTA) sickness absence depend on the level of unemployment. The main question is to what extent unemployment ... -
A non-linear viscoelastic material model with progressive damage based on microstructural evolution and phase transition in polycrystalline ice for design against ice impact
(Peer reviewed; Journal article, 2023)This study presents a nonlinear viscoelastic material model incorporating a progressive damage framework with an iterative algorithm for glacial/freshwater polycrystalline ice subject to compressive impact load induced by ... -
Non-linear Wave Loads on Offshore Wind Support Structure
(Master thesis, 2014)Offshore wind development is constrained by its high cost. One potential way to meet this challenge is to reduce the uncertainty in wave modeling and hydrodynamic loads calculation for offshore wind support structures ... -
Non-Linear Wave-Body Interaction in Severe Waves
(Doctoral theses at NTNU;2019:173, Doctoral thesis, 2019)Offshore structures located in harsh environments may experience large wave loads and wave-induced responses. The present thesis documents a twodimensional numerical investigation of interactions between fixed or floating ... -
Non-markovian survivability assessment model for infrastructure wireless networks
(Journal article; Peer reviewed, 2018)Network design and operation of a mobile network infrastructure, especially its access points, need to consider survivability as a fundamental requirement. Quantifiable approaches to survivability analysis of such ... -
Non-melancholic depressive symptoms are associated with above average fat mass index in the Helsinki birth cohort study
(Peer reviewed; Journal article, 2022)There is an existing link between two of the most common diseases, obesity and depression. These are both of great public health concern, but little is known about the relationships between the subtypes of these conditions. ... -
Non-Newtonian Analysis of a Counter-flow Mixing Reactor for Fast Hydrothermal Liquefaction
(Chapter, 2020)A CFD (computational fluid dynamics) model has been developed in ANSYNS Fluent for studying the use of the nozzle reactor concept for fast HTL of biomass. A Newtonian system was first assumed to make it possible to utilize ... -
Non-normal-Mode Onset of Convection in a Vertical Porous Cylinder
(Peer reviewed; Journal article, 2020)This is the first study reporting a full three-dimensional (3D) non-normal-mode onset of convection in a porous medium. In this paper, the onset of thermal convection in a vertical porous cylinder is investigated theoretically. ...