Blar i NTNU Open på forfatter "Aamo, Ole Morten"

A Comparison of Observers for Estimation of the Bottomhole Pressure.
Opsanger, Eirik Nyland (Master thesis, 2009)New offshore oil recourses that are developed are more difficult to drill and increase the requirements to the technology in the offshore industry. A relatively new technology is Managed Pressure Drilling where a choke ... 
A dynamic model of the drilling action of percussive tools
Song, Xianfeng; Kane, PascalAlexandre; Aamo, Ole Morten; Detournay, Emmanuel (Chapter, 2019)A phenomenological model is proposed to explain the existence of sweet spot in the relationship between the rate of penetration (ROP) and the weightonbit (WOB), i.e., the existence of an optimal WOB for which the ROP is ... 
A LeastSquares Scheme Utilizing Fast Propagating Shock Waves for Early Kick Estimation in Drilling
Holta, Haavard H. F.; Aamo, Ole Morten (Chapter, 2019)A scheme for fast kick estimation in managed pressure drilling is presented. The reservoir pressure and production index are estimated by utilizing information in a fast traveling shock wave induced by an unexpected rise ... 
A note on establishing convergence in adaptive systems
Anfinsen, Henrik; Aamo, Ole Morten (Journal article; Peer reviewed, 2018)We present a new formulation of a convergence result for Lyapunov function candidates satisfying a differential inequality with integrable coefficients that often appears in adaptive control problems. Usually, Barbalat’s ... 
A novel modelbased scheme for kick and loss mitigation during drilling
Hauge, Espen; Aamo, Ole Morten; Godhavn, JohnMorten; Nygaard, Olav Gerhard Haukenes (Journal article; Peer reviewed, 2013)A modelbased in/outflux detection scheme for managed pressure drilling is presented. We apply a globally exponentially stable adaptive observer which estimates the unknown states and parameters of the hydraulic system ... 
A Phenomenological Model of Percussive Drilling: Review of Experimental Evidence
Song, Xianfeng; Aamo, Ole Morten; Kane, PascalAlexandre; Detournay, Emmanuel (Chapter, 2019)In this paper, we review and analyze published experimental findings in light of the hypothesis that the dependence of bitrock interface (BRI) pseudostiffness on the weightonbit (WOB) is the key factor behind the ... 
A robust MultiLoop tuning Procedure based at Succsessive Semidefinite Programming, that achieves optimal Performance and Failure Tolerance
Helgesen, Henrik (Master thesis, 2008)The desired properties of a multiloop PID tuning procedure is to find some parameters that makes the plant robust, meet some desired performance requirements and guarantee failure tolerance. A detailed literature survey ... 
A simplified twophase flow model using a quasiequilibrium momentum balance
Aarsnes, Ulf Jakob Flø; Ambrus, Adrian; Di Meglio, Florent; Vajargah, Ali Karimi; Aamo, Ole Morten; van Oort, Eric (Journal article; Peer reviewed, 2016)We propose a simple model of twophase gas–liquid flow by imposing a quasiequilibrium on the mixture momentum balance of the classical transient driftflux model. This reduces the model to a single hyperbolic PDE, describing ... 
Active Pendulation Damping of Payload on Offshore Vessels
Dahl, Tom Christian (Master thesis, 2007)Shipmounted boom cranes play an important role in the offshore cargo transport process. In recent years, there has been significant need to increase stability of the payload during the cargo transport process for both ... 
Adaptive Control of a Linear Hyperbolic PDE with Uncertain Transport Speed and a Spatially Varying Coefficient
Anfinsen, Henrik; Holta, Haavard H. F.; Aamo, Ole Morten (Peer reviewed; Journal article, 2020)Recently, the first result on backsteppingbased adaptive control of a 1D linear hyperbolic partial differential equation (PDE) with an uncertain transport speed was presented. The system also had an uncertain, constant ... 
Adaptive Control of a Linear, Scalar Hyperbolic PDE with TimeVarying Coefficients
Anfinsen, Henrik; Aamo, Ole Morten (Peer reviewed; Journal article, 2020)We extend a previous result regarding adaptive control of a linear hyperbolic partial differential equation (PDE) with timevarying indomain source coefficient in two ways. Firstly, we introduce a parametrization of the ... 
Adaptive Control of a Scalar 1D Linear Hyperbolic PDE with Uncertain Transport Speed Using Boundary Sensing
Anfinsen, Henrik; Holta, Haavard H. F.; Aamo, Ole Morten (Peer reviewed; Journal article, 2020)We solve an adaptive boundary control problem for an 1D linear hyperbolic partial differential equation (PDE) with an uncertain indomain source parameter and uncertain transport speed using boundary sensing only. Convergence ... 
Adaptive control of linear 2 x 2 hyperbolic systems
Anfinsen, Henrik; Aamo, Ole Morten (Journal article; Peer reviewed, 2018)We design two closely related state feedback adaptive control laws for stabilization of a class of 2 × 2 linear hyperbolic system of partial differential equations (PDEs) with constant but uncertain indomain and boundary ... 
Adaptive Control of Linear Hyperbolic PDEs
Anfinsen, Henrik (Doctoral theses at NTNU;2018:113, Doctoral thesis, 2018)Coupled firstorder linear hyperbolic partial differential equations (PDEs) can be used to model flow and transport phenomena. Relevant physical systems that can be modeled as hyperbolic PDEs are, to mention a few, ... 
Adaptive Observer Design for an n+1 Hyperbolic PDE with Uncertainty and Sensing on Opposite Ends
Holta, Haavard H. F.; Aamo, Ole Morten (Chapter, 2020)An adaptive observer design for a system of n+1 coupled 1D linear hyperbolic partial differential equations with an uncertain boundary condition is presented, extending previous results by removing the need for sensing ... 
Adaptive Observer for Bottomhole Pressure During Drilling
Stamnes, Øyvind Nistad (Master thesis, 2007)To satisfy the increasing petroleum consumption on a world wide basis there is a need to find new resources. As mature fields are drained, reservoir pressure falls, which again leads to tight pressure margins. To reduce ... 
Adaptive OutputFeedback Stabilization of 2 x 2 Linear Hyperbolic PDEs with Actuator and Sensor Delay
Anfinsen, Henrik; Aamo, Ole Morten (Journal article; Peer reviewed, 2018)We derive an adaptive outputfeedback stabilizing controller for a system of 2 × 2 linear hyperbolic partial differential equations (PDEs) with delayed, anticollocated sensing and control. This is done by using a series ... 
Adaptive setpoint regulation of linear 2x2 hyperbolic systems with application to the kick and loss problem in drilling
Holta, Haavard H. F.; Anfinsen, Henrik; Aamo, Ole Morten (Peer reviewed; Journal article, 2020)We study the kick and loss detection and attenuation problem in managed pressure drilling by modeling the well as a distributed parameter system. Two cases are considered, distinguished by whether downhole pressure ... 
Adaptive setpoint regulation of linear n+1 hyperbolic systems with uncertain affine boundary condition using collocated sensing and control
Holta, Haavard H. F.; Aamo, Ole Morten (Peer reviewed; Journal article, 2020)We solve an adaptive control problem for n + 1 hyperbolic systems using collocated sensing and control, extending recent results for adaptive control of 2×2 systems and systems with noncollocated sensing and control. The ... 
Adaptive Stabilization and SetPoint Regulation of Linear 2 x 2 Hyperbolic Systems  With Application to Automatic Attenuation of Kick and Loss in Managed Pressure Drilling
Holta, Haavard (Master thesis, 2017)Linear 2 x 2 hyperbolic partial differential equations can be used to describe many realworld problems and have attracted considerable research interest in later years. This thesis considers adaptive setpoint regulation ...