Scientific Publications in Engineering Sciences: Nye registreringer
Viser treff 1-20 av 702
-
Parameter Identification of Fractional-Order LTI Systems using Modulating Functions with Memory Reduction
(Chapter, 2021)The parameter estimation problem of a linear time-invariant fractional-order system is investigated by means of the modulating function method. Based on the assumption of known model structure and derivative orders, the ... -
A Trajectory-Driven SIMO mm-Wave Channel Model for a Moving Point Scatterer
(Chapter, 2021)In this paper, we propose a trajectory-based three-dimensional (3D) non-stationary channel model for a millimeter wave (mm-Wave) single-input multiple-output (SIMO) system. The proposed channel model is designed to capture ... -
Voltage Source Multilevel Inverters with Reduced Device Count: Topological Review and Novel Comparative Factors
(Peer reviewed; Journal article, 2020)Multilevel inverters (MLIs) have gained increasing interest for advanced energy-conversion systems due to their features of high-quality produced waveforms, modularity, transformerless operation, voltage, and current ... -
Lead-Lag-Shaped Interactive Force Estimation by Equivalent Output Injection of Sliding-Mode
(Chapter, 2020)Estimation of interactive forces, which are mostly unavailable for a direct measurement on the interface between the system and its environment, is an essential task in various motion control applications. This paper ... -
A synthesis of feasible control methods for floating offshore wind turbine system dynamics
(Peer reviewed; Journal article, 2021)During the past decade, the development of offshore wind energy has transitioned from near shore with shallow water to offshore middle-depth water regions. Consequently, the energy conversion technology has shifted from ... -
Assessment of a New Analytical Expression for the Maximum-Power Point Voltage with Series Resistance
(Chapter, 2021)This work compares a recently developed analytical expression for the maximumpower point voltage with experimental data, to test its usability for crystalline silicon solar cells. The experimental data covers measurements ... -
Sensitivity Analysis Of Online Oil Quality Monitoring For Early Detection Of Water Ingress In Marine Propulsion Systems
(Peer reviewed; Journal article, 2020)Gearboxes are critical equipment in the vessel propulsion system. Lubrication contamination caused by water ingress or condensation is one of the major failure modes in marine gearboxes leading to accelerated aging of ... -
Practice for determining friction in hydraulic winch systems
(Peer reviewed; Journal article, 2020)This paper presents a method for estimating friction in hydraulic active heave compensated (AHC) offshore winches. The method is a two-step approach where the first step is to model the friction loss in the hydraulic motors ... -
Dissipation in suspension system augmented by piezoelectric stack: port-Hamiltonian approach
(Chapter, 2020)Analysis of damping in semi-active and active suspension systems is prerequisite for an advanced control and, eventually, energy harvesting functions. This paper addresses the damping in suspension system augmented by the ... -
Pressure-flow dynamics with semi-stable limit cycles in hydraulic cylinder circuits
(Chapter, 2021)In hydraulic circuits of the standard fluid-power actuators and mechanisms, like the linear-stroke cylinders, some hydrodynamic effects are often neglected. It happens mainly due to their complexity and secondariness in ... -
Autonomous mooring towards autonomous maritime navigation and offshore operations
(Chapter, 2020)Bollard is a vital component of mooring system. It is the anchor point for mooring ropes to be fixed in order to secure the vessel or ship. An algorithm that translates the segmented mask of bollard output from masked R-CNN ... -
Steady state counterbalance valve modeling with the inuence of synthetic ester oils using CFD
(Peer reviewed; Journal article, 2020)This study looks in details at the effects of synthetic esters being applied to a counterbalance valve from the perspective of a system engineer. There is limited literature on the subject of applied synthetic esters and ... -
The Recombination Parameter γ : Modeling and Comments
(Journal article; Peer reviewed, 2023)The recombination parameter γ appears in mathematical expressions for the temperature coefficient of solar cells. This work presents a new analytical expression for this parameter. The expression is derived assuming that ... -
Experimental Evaluation of Homogeneous Differentiators Applied to Hydraulic Stroke with Measurement Noise and Acceleration Disturbance
(Chapter, 2024)The design and experimental evaluation of continuous homogeneous differentiators are considered. The differentiator gains follow the high-gain setup with variable gain-scaling parameter L. This parameter results from a ... -
Bollard Segmentation and Position Estimation From Lidar Point Cloud for Autonomous Mooring
(Peer reviewed; Journal article, 2021)This article presents a computer-aided object detection and localization method from lidar 3-D point cloud data. This topic of interest is in the framework of autonomous mooring, where the ship is tied to the rigid structure ... -
Adaptive Backstepping Control of Uncertain Nonlinear Systems with Input and State Quantization
(Peer reviewed; Journal article, 2021)Although it is common in network control systems that the sensor and control signals are transmitted via a common communication network, no result is available in investigating the stabilization problem for uncertain ... -
Modeling and field-experiments identification of vertical dynamics of vehicle with active anti-roll bar
(Chapter, 2020)This paper deals with modeling and identification of vertical dynamics of the ground vehicle equipped with two active anti-roll torsion bars. A series of field tests of a full-scale drive have been performed, from which ... -
Formulation of a consistent crack width calculation method for reinforced concrete members
(Doctoral dissertations at University of Agder;no. 473, Doctoral thesis, 2024)Predicting crack widths in reinforced concrete structures is essential for Serviceability Limit State (SLS) Design. Crack widths that exceed a certain limit may impair the functionality of a structure, limit its use and ... -
Numerical Simulation on Effect of Separator Thickness on Coupling Phenomena in Single Cell of PEFC under Higher Temperature Operation Condition at 363 K and 373 K
(Peer reviewed; Journal article, 2023)In hydrogen energy systems, the polymer electrolyte fuel cell (PEFC) is an important component. The purpose of this study is to clarify the effect of separator thickness (s.t.) in PEFC on the distributions of mass such as ... -
Experimental investigation of two shared mooring configurations for a dual-spar floating offshore wind farm in irregular waves
(Peer reviewed; Journal article, 2024)Shared mooring brings potential cost benefits to a floating wind farm. In such a wind farm, adjacent floaters are connected by shared lines and the total number of mooring lines is reduced. This paper presents an experimental ...