Timm Strecker
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View article: Modeling and Control of Pipeline Networks Supplied by Automated Irrigation Channels
Modeling and Control of Pipeline Networks Supplied by Automated Irrigation Channels Open
International audience
View article: Event-triggered boundary control of 2x2 semilinear hyperbolic systems
Event-triggered boundary control of 2x2 semilinear hyperbolic systems Open
We present an event-triggered boundary control scheme for hyperbolic systems. The trigger condition is based on predictions of the state on determinate sets, where the control input is only updated if the predictions deviate from the refer…
View article: Switched control of over-topping water channels
Switched control of over-topping water channels Open
Automated open-water channels are used to deliver water for irrigation in an efficient manner. In the distant-downstream control architecture, water is released from upstream storage in response to downstream demand. In some situations, su…
View article: Boundary Control and Estimation for Under-Balanced Drilling with Uncertain Reservoir Parameters
Boundary Control and Estimation for Under-Balanced Drilling with Uncertain Reservoir Parameters Open
In under-balanced drilling, the bottom-hole pressure is kept below pore pressure, causing pressure dependent influx of reservoir gas into the wellbore that makes the system unstable at low drawdowns. In this paper we propose a feedback con…
View article: Predictive feedback boundary control of semilinear and quasilinear 2x2 hyperbolic PDE-ODE systems
Predictive feedback boundary control of semilinear and quasilinear 2x2 hyperbolic PDE-ODE systems Open
We present a control design for semilinear and quasilinear 2x2 hyperbolic partial differential equations with the control input at one boundary and a nonlinear ordinary differential equation coupled to the other. The controller can be desi…
View article: Boundary Feedback Control of 2x2 Quasilinear Hyperbolic Systems: Predictive Synthesis and Robustness Analysis
Boundary Feedback Control of 2x2 Quasilinear Hyperbolic Systems: Predictive Synthesis and Robustness Analysis Open
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 boundary, are achieve…
View article: Direct predictive control of a first-order quasilinear hyperbolic PDE
Direct predictive control of a first-order quasilinear hyperbolic PDE Open
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. Thedesign consists …
View article: Limitations of Topside Actuation for Rejecting Heave-induced Pressure Oscillations in Offshore Drilling
Limitations of Topside Actuation for Rejecting Heave-induced Pressure Oscillations in Offshore Drilling Open
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 rejecting such pre…
View article: Control system design for concrete irrigation channels
Control system design for concrete irrigation channels Open
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 to account for con…
View article: Output feedback boundary control of series interconnections of 2 × 2 semilinear hyperbolic systems
Output feedback boundary control of series interconnections of 2 × 2 semilinear hyperbolic systems Open
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 control law c…
View article: Rejecting heave-induced pressure oscillations in a semilinear hyperbolic well model
Rejecting heave-induced pressure oscillations in a semilinear hyperbolic well model Open
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 line with nonlinear…
View article: Rejecting pressure fluctuations induced by string movement in drilling**Financial support from Statoil ASA is gratefully acknowledged.
Rejecting pressure fluctuations induced by string movement in drilling**Financial support from Statoil ASA is gratefully acknowledged. Open
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 results on distur…