Blar i NTNU Open på forfatter "Jäschke, Johannes"
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Modelling and Control of Brobekk Waste Incineration Plant
Pehrson, Håvard (Master thesis, 2010)Model Predictive Control of Brobekk waste incineration plant is the main focus of this master thesis. The motivation for using MPC at Brobekk is primarily to improve the control of the temperature towards the combustion ... -
Modelling and Control of Coalescence Based Gravity Separators in a Subsea Separation System - with Models of Produced Water Treatment
Heggheim, Sindre Johan (Master thesis, 2018)Subsea separation of well fluids is a way to reduce the cost of topside processing, and to simplify and reduce the export of products. Subsea separation consist of bulk separators and purifiers, to separate the multi-phase ... -
Modelling and Optimization of Compact Sub-sea Separators - Gas-Liquid separation
Matovu, Fahad (Master thesis, 2015)This Master thesis focuses on Modelling and Optimization of Compact sub-sea separators using a given separation system. The separation system consists of three separation units: a gravity separator, a deliquidizer and a ... -
Modelling and Simulation of a Two-Stage Refrigeration Cycle
Verheyleweghen, Adriaen (Master thesis, 2015)A two-stage refrigeration cycle was modelled and optimized in MATLAB. The optimum was found to be very flat, resulting in small losses from disturbances and implementation errors. The two unconstrained degrees of freedom ... -
Modelling Failure Mechanisms in Subsea Equipment
Hansen, Siri Kildal (Master thesis, 2016)The oil and gas industry is recently facing a challenge to increase the efficiency and reduce the costs. One way to reduce costs is to better optimize the maintenance strategy. By applying failure mechanism models it could ... -
Modelling, Control, and Optimization of a Recirculating Aquaculture System
dos Santos, Allyne Machado (Doctoral theses at NTNU;2023:336, Doctoral thesis, 2023)Recirculating aquaculture systems (RAS) are closed-loop systems that recycle most of the effluent of a fish tank after particle removal and water treatment. This type of process requires good control of the water quality, ... -
Multiple shooting for training neural differential equations on time series
Turan, Evren Mert; Jäschke, Johannes (Peer reviewed; Journal article, 2021)Neural differential equations have recently emerged as a flexible data-driven/hybrid approach to model time-series data. This work experimentally demonstrates that if the data contains oscillations, then standard fitting ... -
Nonlinear Model Predictive Control and Dynamic Real-Time Optimization of Semi-Batch Reactors - A Case Study of Expandable Polystyrene Production
Hall, Brittany (Master thesis, 2018)The aim of this thesis was to develop an advanced two-layer control structure for the semi-batch polymerization of expandable polystyrene (EPS) that minimizes the batch time while still producing a set polymer quality and ... -
Nonlinear model predictive control of a semi-batch reactor for miniemulsion polymerization of vinyl chloride monomer
Troøyen, Jørgen (Master thesis, 2023)Målet med denne avhandlingen var å implementere og teste ulineær modellbasert prediktiv regulering (NMPC) på en semi-batch reaktor for en miniemulsjonspolymerisasjonsprosess. Motivasjonen bak arbeidet i denne avhandlingen ... -
Nonsmooth Modelling of Multiphase Multicomponent Heat Exchangers with Phase Changes
Reed, Marius (Master thesis, 2018)Developing proper and consistent dynamic models of processes with phase changes can be challenging. Appearance and disappearance of phases result in changes in the system equations and is not known a priori. Dynamic models ... -
Novel Approaches in Robust Multistage Nonlinear Model Predictive Control
Thombre, Mandar (Doctoral theses at NTNU;2021:51, Doctoral thesis, 2021)A powerful tool that has been widely used for control and optimization in the chemical process industry is model predictive control (MPC), thanks to its capacity for handling multivariable constrained control problems. ... -
Novel Approaches to Online Process Optimization Under Uncertainty: Addressing the limitations of current industrial practice
Krishnamoorthy, Dinesh (Doctoral theses at NTNU;2019:301, Doctoral thesis, 2019)In the face of growing competition and increased necessity to focus on sustainability and energy efficiency, there is a clear need to optimize the day-to-day operation of many industrial processes. This involves online ... -
Optimal control of thermal energy storage under supply and demand uncertainty
Mdoe, Zawadi Ntengua (Master thesis, 2019) -
Optimal Operation and Design of a Thermal Energy Storage Tank
Tysland, Agnes Camilla (Master thesis, 2021) -
Optimal Operation of a Solar Powered Thermal Energy Storage System for Cooking
Rekdal, Mikal (Master thesis, 2020)I denne masteroppgaven ble driften av et varmelagringssystem drevet av overskuddsenergi fra solcelleproduksjon for matlaging modellert og optimalisert. Hovedformålet med oppgaven var å undersøke systemets kapasitet under ... -
Optimal operation of a subsea separation system including a coalescence based gravity separator model and a produced water treatment section
Das, Tamal; Heggheim, Sindre Johan; Dudek, Marcin; Verheyleweghen, Adriaen; Jäschke, Johannes (Journal article; Peer reviewed, 2019)In this work, we develop a model for a gravity separator, and we use it together with models from the literature to study the control of a subsea separation system that separates oil, gas, and water from well fluids in ... -
Optimal Operation of Integrated Chemical Processes: With Application to the Ammonia Synthesis
Straus, Julian (Doctoral theses at NTNU;2018:222, Doctoral thesis, 2018)Chemical processes have to be operated at their economic optimum to remain competitive. This is called optimal operation. Optimal operation is frequently incorporated using a real-time optimization approach. In this approach, ... -
Optimal Operation of Parallel Heat Exchanger Networks
Aaltvedt, Stian (Master thesis, 2013)Optimal operation of parallel heat exchanger networks is desirable for many processesaiming to achieve increased supply and potentially higher profit. The aimis to control the final outlet temperature within a certain ... -
Optimal operation strategies for dynamic processes under uncertainty
de Oliveira, Vinicius (Doctoral thesis at NTNU;2016:105, Doctoral thesis, 2016)The main focus of this thesis is to find implementation strategies for the optimal operation of processes during transients. That is, we do not focus on the algorithms to solve a given dynamic optimization problem, but ... -
Optimal scheduling of flexible thermal power plants with lifetime enhancement under uncertainty
Rúa, Jairo; Verheyleweghen, Adriaen; Jäschke, Johannes; Nord, Lars O. (Peer reviewed; Journal article, 2021)Renewable energy sources have been the focal point to decarbonise the power sector. The large deployment of these intermittent power generation units requires mechanisms to balance the grid. Thermal power plants can provide ...