Browsing NTNU Open by Author "Strecker, Timm"
Now showing items 1-14 of 14
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Attenuating heave-induced pressure oscillations in offshore drilling by downhole flow control
Strecker, Timm; Aamo, Ole Morten (Journal article, 2019)One of the challenges when applying managed pressure drilling (MPD) offshore on a floating rig is the wave-induced heaving motion of the rig. During drillstring extensions, the drillstring is rigidly attached to the rig ... -
Boundary Feedback Control of 2×2 Quasilinear Hyperbolic Systems: Predictive Synthesis and Robustness Analysis
Strecker, Timm; Aamo, Ole Morten; Cantoni, Michael (Peer reviewed; Journal article, 2022)We present a predictive feedback control method for a class of quasilinear hyperbolic systems with one boundary control input. Assuming exact model knowledge, convergence to the origin or tracking at the uncontrolled ... -
Control system design for concrete irrigation channels
Strecker, Timm; Aamo, Ole Morten; Cantoni, Michael (Chapter, 2017)Concrete channels find use at the periphery of irrigation networks, for expansion and to replace small earthen channels given the relative ease of maintenance and elimination of seepage losses. In design, it is important ... -
Direct predictive control of a first-order quasilinear hyperbolic PDE
Strecker, Timm; Aamo, Ole Morten; Cantoni, Michael (Journal article; Peer reviewed, 2019)We present a method for the boundary controlof a system governed by one hyperbolic PDE with a non-localcoupling term by state feedback. The method is an extensionof recently developed controllers for semilinear systems. ... -
Limitations of Topside Actuation for Rejecting Heave-induced Pressure Oscillations in Offshore Drilling
Strecker, Timm; Aamo, Ole Morten (Journal article; Peer reviewed, 2018)The heave motion of a floating rig induces pressure oscillations in the well when the heave compensators are disabled during connections. In this paper we discuss several factors affecting the achievable performance when ... -
Modeling and Control of Heave- Induced Pressure Oscillations in Offshore Drilling
Strecker, Timm (Doctoral theses at NTNU;2018:360, Doctoral thesis, 2018)This thesis addresses the topic of heave-induced pressure fluctuations in offshore drilling from floating platforms. Such pressure oscillations occur during drill string connections when the drill string is rigidly attached ... -
Output feedback boundary control of 2x2 semilinear hyperbolic systems
Strecker, Timm; Aamo, Ole Morten (Journal article; Peer reviewed, 2017)We consider the control and state estimation of a class of 2x2 semilinear hyperbolic systems with actuation and sensing collocated at one boundary. Our approach exploits the dynamics on the characteristic lines of the ... -
Output feedback boundary control of heterodirectional semilinear hyperbolic systems
Strecker, Timm; Aamo, Ole Morten; Cantoni, Michael (Peer reviewed; Journal article, 2020)We solve the problem of stabilizing a general class of 1-d semilinear hyperbolic systems with an arbitrary number of states convecting in each direction and with the actuation and sensing restricted to one boundary. The ... -
Output feedback boundary control of series interconnections of 2 x 2 semilinear hyperbolic systems
Strecker, Timm; Aamo, Ole Morten (Journal article; Peer reviewed, 2017)In this paper, we present an output feedback controller for systems consisting of n 2 × 2 semilinear hyperbolic systems in series interconnection where actuation and sensing are restricted to one boundary. The output-feedback ... -
Predictive feedback boundary control of semilinear and quasilinear 2 × 2 hyperbolic PDE–ODE systems
Strecker, Timm; Aamo, Ole Morten; Cantoni, Michael (Peer reviewed; Journal article, 2022)We present a control design for semilinear and quasilinear 2 × 2 hyperbolic partial differential equations with the control input at one boundary and a nonlinear ordinary differential equation coupled to the other. The ... -
Rejecting heave-induced pressure oscillations in a semilinear hyperbolic well model
Strecker, Timm; Aamo, Ole Morten (Journal article; Peer reviewed, 2017)In this paper, we apply recent results on the output feedback control of 2×2 semilinear systems to the problem of rejecting heave-induced pressure oscillations in offshore drilling. The well is modeled as a transmission ... -
Rejecting pressure fluctuations induced by string movement in drilling
Strecker, Timm; Aamo, Ole Morten (Journal article; Peer reviewed, 2016)Keeping the pressure within predefined bounds is essential for the safety of managed pressure drilling operations, but drill string movements can induce pressure fluctuations that violate these margins. We extend previous ... -
Simulation of heave-induced pressure oscillations in Herschel-Bulkley muds
Strecker, Timm; Aamo, Ole Morten; Manum, Henrik (Journal article; Peer reviewed, 2017)Heave induces pressure oscillations when drilling offshore from floating rigs. A time-domain model is proposed to analyze and predict such pressure oscillations. The model considers the coupled dynamics of the mud and the ... -
Two-Sided Boundary control and State Estimation of 2x2 Semilinear Hyperbolic Systems
Strecker, Timm; Aamo, Ole Morten (Chapter, 2017)We solve the problem of controlling a class of one-dimensional semilinear 2 × 2 hyperbolic systems to the origin in minimum time using actuation at both boundaries of the domain. The control method can also be used to solve ...