Browsing Publikasjoner fra CRIStin - NTNU by Title
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Optimization of Francis Turbines for Variable Speed Operation Using Surrogate Modeling Approach
(Peer reviewed; Journal article, 2020)Previous studies suggested variable speed operation (VSO) of Francis turbines as a measure to improve the efficiency at off-design operating conditions. This is, however, strongly dependent on the hydraulic design and, for ... -
Optimization of helium extraction processes integrated with nitrogen removal units: A comparative study
(Journal article; Peer reviewed, 2019)Helium is regarded as a vital gas to various industries such as medicine, aircraft manufacturing, electronics and fiber optics fabrication. Currently, natural gas reserves are considered the only viable resource for this ... -
Optimization of maintenances following proof tests for the final element of a safety-instrumented system
(Journal article; Peer reviewed, 2020)Safety-instrumented systems (SISs) have been widely installed to prevent accidental events and mitigate their consequences. Mechanical final elements of SISs often become vulnerable with time due to degradations, but the ... -
Optimization of offshore wind turbine support structures using an analytical gradient-based method
(Journal article; Peer reviewed, 2015)Design optimization of offshore wind turbine support structures is an expensive task; due to the highly-constrained, non-convex and non-linear nature of the design problem. This paper presents an analytical gradient-based ... -
Optimization of offshore wind turbine support structures using analytical gradient-based method
(Report;BAT/MB/OW-R01/2015, Research report, 2015)Design optimization of the offshore wind turbine support structure is an expensive task; due to the highly-constrained, non-convex and non-linear nature of the design problem. This report presents an analytical gradient-based ... -
Optimization of operational cost for a grid-supporting PV system with battery storage
(Journal article, 2016)Coupling an energy storage to a photovoltaic (PV) system not only increases the self-consumption but also solves the over-voltage issues if the cycling of the storage is properly controlled. Whatever the application the ... -
Optimization of Organic Rankine Cycles for Waste Heat Recovery From Aluminum Production Plants
(Journal article; Peer reviewed, 2019)This paper presents the optimization of organic Rankine cycles (ORCs) for recovering waste heat from a hypothetical aluminum production plant to be installed in Norway. The case study is particularly interesting because ... -
Optimization of periodic inspection time of sis subject to a regular proof testing
(Chapter, 2018)Periodic testing is a method to ascertain the availability of Safety Instrumented Systems (SIS). These systems are generally passive and are activated only on demand. Testing is then required to diagnose their current state ... -
Optimization of Process Parameters for Powder Bed Fusion Additive Manufacturing by Combination of Machine Learning and Finite Element Method: A Conceptual Framework
(Journal article; Peer reviewed, 2018)In addition to prototyping, Powder Bed Fusion (PBF) AM processes have lately been more widely used to manufacture end-use parts. These changes lead to necessity of higher requirements to quality of a final product. ... -
Optimization of Reactor Temperature for Continuous Anaerobic Digestion of Cow Manure: Bangladesh Perspective
(Peer reviewed; Journal article, 2020)Converting organic waste into energy through anaerobic digestion is gaining popularity day by day. The reactor temperature is considered as one of the most vital factors for the digestion process. An experiment was conducted ... -
Optimization of recertification intervals for PSV based on major accident risk
(Journal article, 2016)Overpressure is a major hazard in the process industry with the potential to lead to a major accident. Pressure Safety Valves (PSVs) are often used as the last layer of protection against such a hazard and require regular ... -
Optimization of routing and scheduling of vessels to perform maintenance at offshore wind farms
(Journal article; Peer reviewed, 2015)This paper studies the problem of finding the optimal routes and schedules for a fleet of vessels that are to perform maintenance tasks at an offshore wind farm. To solve the problem two alternative models are presented: ... -
Optimization of Sample Size for Two-Point Diameter Verification in Coordinate Measurements
(LNEE;volume 484, Journal article; Peer reviewed, 2019)This paper investigates the possibility for reduction of sample size for inspection of two-point diameters with a coordinate measuring machine, by use of statistical methods. The statistical methods implement the parametric ... -
Optimization of topological complexity for one-dimensional arterial blood flow models
(Journal article; Peer reviewed, 2018)As computational models of the cardiovascular system are applied in modern personalized medicine, maximizing certainty of model input becomes crucial. A model with a high number of arterial segments results in a more ... -
Optimization procedure for variable speed turbine design
(Journal article; Peer reviewed, 2018)This article outlines a design procedure for variable speed Francis turbines using optimization software. A fully parameterized turbine design procedure is implemented in MATLAB. ANSYS CFX is used to create hill diagrams ... -
Optimization to support policy decisions stimulating value creation in the forestry sector
(Chapter, 2017)Following past decades' extensive afforestation efforts in Norway, mature forest volumes are currently increasing. Forestry politics call for sustainable and efficient resource usage and increased regional processing, ... -
Optimization, risk and resilience in LNG transportation systems
(Journal article; Peer reviewed, 2013)Purpose – This paper aims to address how to systematically address vulnerability in a maritime transportation system using a formal vulnerability assessment approach, create quantitative measures of disruption risk and ... -
Optimization-Based Automatic Docking and Berthing of ASVs Using Exteroceptive Sensors: Theory and Experiments
(Peer reviewed; Journal article, 2020)Docking of autonomous surface vehicles (ASVs) involves intricate maneuvering at low speeds under the influence of unknown environmental forces, and is often a challenging operation even for experienced helmsmen. In this ... -
Optimization-based motion planning for trawling
(Journal article; Peer reviewed, 2018)This work presents an optimization-based motion planning system for trawling operations. The formulation makes use of simplistic physical descriptions of the vessel and fishing gear together with catch dynamics of sweeping ... -
Optimization-based profitability management tool for cloud broker
(Journal article; Peer reviewed, 2018)This paper represents a model that supports the choice of efficient service portfolios at a cloud service broker. Among the many types of different cloud service brokers, we focus on a firm that offers service bundles that ...