Blar i NTNU Open på forfatter "Holta, Haavard H. F."

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 ... 
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 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 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 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 ... 
An Adaptive Observer Design for 2×2 Semilinear Hyperbolic Systems using Distributed Sensing
Holta, Haavard H. F.; Aamo, Ole Morten (Journal article; Peer reviewed, 2019)We design an adaptive modelbased observer for state and parameter estimation in 2 × 2 semilinear hyperbolic systems with uncertain parameters where we assume that one of the two distributed states is available through ... 
Boundary SetPoint Regulation of a Linear 2×2 Hyperbolic PDE with Uncertain Bilinear Boundary Condition
Holta, Haavard H. F.; Aamo, Ole Morten (Journal article; Peer reviewed, 2018)We design an adaptive controller for a 2 × 2 linear hyperbolic PDE with uncertain boundary parameters where measurements are taken at both boundaries, while only one boundary is actuated. The uncertainty, which appears in ... 
Improved Kick and Loss Detection and Attenuation in Managed Pressure Drilling by Utilizing Wired Drill Pipe
Holta, Haavard H. F.; Anfinsen, Henrik; Aamo, Ole Morten (Journal article; Peer reviewed, 2018)A model based method for kick and loss detection and attenuation in Managed Pressure Drilling is presented. The drilling system is modeled as a distributed parameter system combined with a reservoir flow equation containing ... 
Model Based Early Kick/Loss Detection and Attenuation with Topside Sensing in MPD
Jinasena, Asanthi; Holta, Haavard H. F.; Jondahl, Morten Hansen; Welahettige, Prasanna Kumara Welahetti; Aamo, Ole Morten; Sharma, Roshan; Viumdal, Håkon; Lie, Bernt (Peer reviewed; Journal article, 2020)Early kick/loss detection is a crucial part of safe well control, and it plays a major role in the reduction of risk and nonproductive time in drilling. In conventional drilling, topside sensing is used for early kick/loss ...