28 results on '"Garone, Emanuele"'
Search Results
2. MIMO tracking control of LTI systems: A geometric approach
- Author
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Padula, Fabrizio, Ntogramatzidis, Lorenzo, and Garone, Emanuele
- Published
- 2019
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3. A parallel distributed supervision strategy for multi-agent networked systems
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Casavola, Alessandro, Garone, Emanuele, and Tedesco, Francesco
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- 2016
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4. Sufficient conditions for the stability of a class of second order systems
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Nicotra, Marco M., Naldi, Roberto, and Garone, Emanuele
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- 2015
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5. Switching control laws in the presence of measurement noise
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Garone, Emanuele, Naldi, Roberto, and Frazzoli, Emilio
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- 2010
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6. On the continuity of control allocation for surface vessels with two azimuth thrusters.
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Mukwege, Frank and Garone, Emanuele
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AZIMUTH , *LIPSCHITZ continuity , *CONTINUITY - Abstract
This paper presents two novel results concerning the control allocation problem (CAP) for marine crafts with 2 azimuth thrusters. The first result is a novel closed form solution for the CAP which ensures Lipschitz continuity of the azimuth angle. The second result is a convex optimization reformulation of the CAP for the case of limited rate of changes for the actuators orientation which includes a novel regularization term that avoids anomalous behaviors due to underactuation. The effectiveness of the two methods are showcased through numerical simulations. • Novel closed-form solution enhances marine craft control with 2 azimuth thrusters. • Convex reformulation manages actuator rate of change, preventing anomalous behavior. • Simulations validate closed-form solution and convex optimization [ABSTRACT FROM AUTHOR]
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- 2023
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7. Newton-based extremum seeking: A second-order Lie bracket approximation approach.
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Labar, Christophe, Garone, Emanuele, Kinnaert, Michel, and Ebenbauer, Christian
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HESSIAN matrices , *MATRIX inversion , *COST functions , *MATHEMATICAL functions , *DYNAMICAL systems , *BRACKETS - Abstract
In this paper, we present novel multi-variable Newton-based extremum seeking systems, based on Lie bracket approximation methods. More precisely, we consider cost functions with an unknown mathematical description, but whose value can be measured on-line. We propose extremum seeking systems that approximate the Newton-based optimization law, by combining the on-line measurement of the cost with time-periodic excitation signals. The inversion of the Hessian matrix is avoided by introducing a first order dynamical system, whose output approximates the Newton step. This provides practical robustness with respect to ill-conditioned Hessian matrices. Semi-global stability properties of the proposed schemes are demonstrated both for static cost functions and for cost functions associated with a general non-linear dynamical system. The effectiveness of the approach is shown in simulations. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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8. A general framework for approximated model stable inversion.
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Romagnoli, Raffaele and Garone, Emanuele
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MARKOVIAN jump linear systems , *LEAST squares - Abstract
Abstract In this paper we propose an approximated method for the design of feedforward actions based on model stable inversion. In the proposed framework the solution of the model stable inversion is approximated in the least squares sense by a suitable combination of any arbitrary set of basis functions. The paper makes use of operator theory to derive a closed-form formula to compute such approximation and to provide boundedness properties for the computed solution. Simulations are provided to show the effectiveness of the proposed method with different families of basis functions. [ABSTRACT FROM AUTHOR]
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- 2019
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9. Reference and command governors for systems with constraints: A survey on theory and applications.
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Garone, Emanuele, Di Cairano, Stefano, and Kolmanovsky, Ilya
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PREDICTIVE control systems , *AEROSPACE engineering , *AUTOMATIC control systems , *PREDICTION models , *PARAMETER estimation , *NONLINEAR systems - Abstract
Reference and command governors are add-on control schemes which enforce state and control constraints on pre-stabilized systems by modifying, whenever necessary, the reference. This paper surveys the extensive literature concerning the development of such schemes for linear and nonlinear systems. The treatment of unmeasured disturbances and parametric uncertainties is also detailed. Generalizations, including extended command governors, feedforward reference governors, reduced order reference governors, parameter governors, networked reference governors, and decentralized/distributed reference governors, are discussed. Practical applications of these techniques are presented and surveyed as well. A comprehensive list of references is included. Connections with related approaches, including model predictive control and input shaping, are discussed. Opportunities and directions for future research are highlighted. [ABSTRACT FROM AUTHOR]
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- 2017
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10. Modelling ectotherms' populations considering physiological age structure and spatial motion: A novel approach.
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Rossini, Luca, Bono Rosselló, Nicolás, Contarini, Mario, Speranza, Stefano, and Garone, Emanuele
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AGE ,COLD-blooded animals ,DROSOPHILA suzukii ,BEHAVIORAL assessment ,LIFE cycles (Biology) ,ORDINARY differential equations - Abstract
• Reformulation of a physiologically-based model describing ectotherms. • Spatialization of a system of ordinary differential equations describing life stages. • Mathematical description of three typical case studies of ecological interest. • Analysis of the model behavior. • Simulations in the case study of Drosophila suzukii. The mathematical description of the dynamics of ectotherm populations has a crucial role in understanding and forecasting insect pests outbreaks, as well as to support the formulation of low-impact control strategies. Even though in recent years a considerable step forward has been made in modelling the biological life cycle of many ectotherms, the modelling of spatial aspects still remain partially unexplored. This work aims to fill a gap in knowledge by modelling the environmental factors-driven spatial motion of insects considering populations which develop over time, and through their life stages. Accordingly, spatial motion is proposed by modifying an existing physiologically based model by adding a subdivision of the area of interest in interconnected subareas represented by means of graph. Besides the mathematical framework, the model behavior is theoretically analyzed by considering three common cases of spatial motion occurring in cultivated fields: trap attraction, wind transportation, and a combination of the both cases. Simulations focus on the case of Drosophila suzukii , chosen due to the large amount of biological data available in the current literature. The behavior analysis shows the great potential of the model presented in this paper in the field of pest management, agriculture, and ecology. [ABSTRACT FROM AUTHOR]
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- 2022
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11. Linear matrix inequalities for globally monotonic tracking control.
- Author
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Garone, Emanuele and Ntogramatzidis, Lorenzo
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MATRIX inequalities , *MATHEMATICAL analysis , *ALGEBRA , *LINEAR differential equations , *ELECTRONIC controllers - Abstract
This paper addresses the problem of achieving monotonic tracking control for any initial condition (also referred to as global monotonic tracking control ). This property is shown to be equivalent to global non-overshooting as well as to global non-undershooting (i.e., non-overshooting and non-undershooting for any initial condition, respectively). The main objective of this paper is to prove that a stable system is globally monotonic if and only if all the rows of the output matrix are left eigenvectors of the space transition matrix. This property allows one to formulate the design of a controller which ensures global monotonic tracking as a convex optimization problem described by a set of Linear Matrix Inequalities (LMIs). [ABSTRACT FROM AUTHOR]
- Published
- 2015
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12. Clock synchronization protocol for wireless sensor networks with bounded communication delays.
- Author
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Garone, Emanuele, Gasparri, Andrea, and Lamonaca, Francesco
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SYNCHRONIZATION , *WIRELESS sensor networks , *MATHEMATICAL bounds , *TELECOMMUNICATION systems , *PROBLEM solving - Abstract
In this paper, we address the clock synchronization problem for wireless sensor networks. In particular, we consider a wireless sensor network where nodes are equipped with a local clock and communicate in order to achieve a common sense of time. The proposed approach consists of two asynchronous consensus algorithms, the first of which synchronizes the clocks frequency and the second of which synchronizes the clocks offset. This work advances the state of the art by providing robustness against bounded communication delays. A theoretical characterization of the algorithm properties is provided. Simulations and experimental results are presented to corroborate the theoretical findings and show the effectiveness of the proposed algorithm. [ABSTRACT FROM AUTHOR]
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- 2015
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13. A two-layer distributed MPC approach to thermal control of Multiprocessor Systems-on-Chip.
- Author
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Tilli, Andrea, Garone, Emanuele, Conficoni, Christian, Cacciari, Matteo, Bosso, Alessandro, and Bartolini, Andrea
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MULTIPROCESSORS , *HIGH performance computing , *PARTIAL differential equations , *KIRKENDALL effect , *MICROGRIDS , *POWER density - Abstract
Next-generation Multiprocessor, or Multicore, Systems-on-Chip offer very high computing performance at the expense of a very high power density unevenly distributed on the chip. The hot spots thus generated represent a significant source of performance and reliability degradation, as well as power consumption increase. In recent years, run-time thermal control strategies have been developed to deal with this issue by acting on some "computational knobs" (e.g., clock frequencies and supply voltages). In this context, schemes based on Model Predictive Control (MPC) are particularly suitable due to their capability to deal with constraints explicitly. In this paper, we first discuss relevant properties for the design of predictive controllers for thermal systems. Starting from the Partial Differential Equation (PDE) describing heat diffusion in a solid, we prove meaningful feasibility properties that can be leveraged for constraint reduction. We then present a procedure to derive approximated but effective modular thermal models intended to build an efficient distributed MPC. Finally, a two-layer control solution is proposed to maximize performance while preserving feasibility despite model approximations. The effectiveness of this approach is validated through extensive and realistic numerical simulations. • A distributed controller is proposed for the optimal thermal capping of MPSoCs. • Control feasibility conditions are studied exploiting a PDE thermal model. • A hysteresis controller is designed for decentralized ultimate thermal capping. • A distributed MPC strategy is employed for performance optimization. • The resulting two-layer solution is validated for relevant simulation benchmarks. [ABSTRACT FROM AUTHOR]
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- 2022
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14. Sensorless supervision of linear dynamical systems: The Feed-Forward Command Governor approach
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Garone, Emanuele, Tedesco, Francesco, and Casavola, Alessandro
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LINEAR systems , *LINEAR time invariant systems , *DISCRETE-time systems , *COMPUTER simulation , *CONSTRAINED optimization , *PROBLEM solving - Abstract
Abstract: This paper proposes a novel class of Command Governor (CG) strategies for input and state-related constrained discrete-time LTI systems subject to bounded disturbances in the absence of explicit state or output measurements. While in traditional CG schemes the set-point manipulation is undertaken on the basis of either the actual measure of the state or its suitable estimation, it is shown here that the CG design problem can be solved, with limited performance degradation and with similar properties, also in the case that such an explicit measure is not available. This approach, which will be referred to as the Feed-Forward CG (FF-CG) approach, may be a convenient alternative CG solution in all situations whereby the cost of measuring the state may be a severe limitation, e.g. in distributed or decentralized applications. In order to evaluate the method proposed here, numerical simulations on a physical example have been undertaken and comparisons with the standard state-based CG solution reported. [Copyright &y& Elsevier]
- Published
- 2011
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15. Explicit reference governor on [formula omitted] for torque and pointing constraint management.
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Nakano, Satoshi, Nguyen, Tam W., Garone, Emanuele, Ibuki, Tatsuya, and Sampei, Mitsuji
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BODY image , *TORQUE , *EULER angles , *GOVERNORS , *ARTIFICIAL satellite attitude control systems , *QUATERNIONS , *RIGID bodies - Abstract
This paper focuses on the constrained attitude control of a rigid body. We propose an Explicit Reference Governor (ERG) specifically designed to handle constraints on S O (3). Two types of constraints are considered: (i) input torque constraints, and (ii) geometric conic pointing constraints. The objective of this paper is to design a control law that is able to steer the attitude of a rigid body to the desired attitude reference while enforcing constraints at all times. To this end, the first step is to design a controller that makes the desired attitude asymptotically stable when constraints (i) and (ii) are neglected. Next, the proposed control scheme is augmented with a novel ERG scheme able to add constraint-handling capabilities to the overall architecture. All the proposed solutions are defined in terms of S O (3) and do not make use of any parameterization such as quaternions or Euler angles. Numerical simulations are carried out to show the effectiveness of the proposed control scheme. [ABSTRACT FROM AUTHOR]
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- 2023
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16. Control of a quadrotor and a ground vehicle manipulating an object.
- Author
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Nguyen, Tam Willy, Catoire, Laurent, and Garone, Emanuele
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COOPERATIVE control systems , *DRONE aircraft , *CONSTRAINT satisfaction , *ARTIFICIAL satellite attitude control systems , *CASCADE control , *REMOTELY piloted vehicles - Abstract
This paper focuses on the control of a cooperative system composed of an Unmanned Aerial Vehicle (UAV) and an Unmanned Ground Vehicle (UGV) manipulating an object. The two units are subject to input saturations and collaborate to move the object to a desired pose characterized by its position and inclination. The dynamics are derived using the Euler–Lagrange method. A stabilizing control law is proposed where the UGV is tasked to deploy the object to a certain position whereas the UAV adjusts its inclination. In particular, a proportional–derivative control law is proposed for the UGV, and a cascade control is used for the UAV, where the inner loop controls the attitude of the UAV and the outer loop stabilizes the inclination of the object. The stability of the points of equilibrium is proven using small gain arguments. To ensure constraints satisfaction at all times, a reference governor unit is added to this stabilizing control law. Simulations and experimental results are provided to validate the effectiveness of the proposed control scheme. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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17. Nonlinear control of a tethered UAV: The taut cable case.
- Author
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Nicotra, Marco M., Naldi, Roberto, and Garone, Emanuele
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THRUST vector control , *NONLINEAR theories , *NONLINEAR control theory , *CONTROL theory (Engineering) , *CASCADE control - Abstract
This paper focuses on the design of a stabilizing control law for an aerial vehicle physically connected to a ground station by means of a tether cable. By taking advantage of the tensile force acting along the taut cable, it is shown that the tethered UAV can maintain a non-zero attitude while hovering in a constant position. The control objective is to stabilize the desired configuration while simultaneously ensuring that the cable remains taut at all times. This leads to a nonlinear control problem subject to constraints. This paper provides a two-step solution. First, the system is stabilized using a cascade control scheme based on thrust vectoring. Then, constraint satisfaction is guaranteed using a novel Reference Governor scheme. [ABSTRACT FROM AUTHOR]
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- 2017
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18. A constrained control framework for unmanned aerial vehicles based on Explicit Reference Governor.
- Author
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Tartaglione, Gaetano, Nicotra, Marco M., Naldi, Roberto, and Garone, Emanuele
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LYAPUNOV functions , *GOVERNORS , *VERTICALLY rising aircraft - Abstract
This paper tackles the constrained control problem of unmanned aerial vehicles with planar multirotors. The proposed solution splits the constrained control problem into two separate tasks, i.e. stabilization and constraint enforcement. It is shown that the problems addressed by each individual layer is much simpler than the original combined problem. For the unconstrained control of UAVs we consider a control scheme based on a cascade structure. The Lyapunov function for the stabilized cascaded system is then derived. Using this Lyapunov function, we develop an Explicit Reference Governor for constraint enforcement. Numerical simulation shows the effectiveness of the proposed approach. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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19. A sum-of-squares-based procedure to approximate the Pontryagin difference of basic semi-algebraic sets.
- Author
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Cotorruelo, Andres, Kolmanovsky, Ilya, and Garone, Emanuele
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SEMIALGEBRAIC sets , *SUM of squares , *ROBUST control , *PREDICTION models , *POINT set theory - Abstract
The P-difference between two sets A and B is the set of all points, C , such that the sum of B to any of the points in C is contained in A. Such a set difference plays an important role in robust model predictive control and set-theoretic control. In this paper, we show that an inner approximation of the P-difference between two sets described by collections of polynomial inequalities can be computed using Sums of Squares Programming. The effectiveness of the procedure is shown with some computational examples. [ABSTRACT FROM AUTHOR]
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- 2022
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20. Experimental validation of a constrained control architecture for a multi-robot bricklayer system.
- Author
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Ambrosino, Michele, Boucher, Fabian, Mengeot, Pierre, and Garone, Emanuele
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TECHNOLOGICAL innovations , *CRANES (Machinery) , *ROBOTICS - Abstract
Robotics in construction is an emerging field that aims to automate various construction activities. Among the various innovative technologies for the construction sector, in this paper we focus on robotic solutions for the bricklaying task. In particular, we describe and explain in detail the implementation of a control framework for a recently introduced multi-robot bricklaying concept, specifically designed for laying activities with large and heavy blocks. The multi-robot system subject of this work is based on the collaboration of a robotic manipulator and a crane. The control architecture proposed to perform the construction task belongs to the Explicit Reference Governor (ERG) formalism. The ERG is a constrained control structure that enforces the constraints of the system and ensures that the robotic system operates correctly and safely. The efficiency of the proposed solution is confirmed by experimental validation on a custom-made crane and a KUKA LBR IIWA14R820 robotic arm. [Display omitted] • Implementation of a constrained control for a multi-robot bricklayer system for construction activities. • The proposed control scheme does not rely on any online optimization problems. • Detailed explanation of the full-scale prototype and implementation of the control algorithm. • Experimental validation on a custom-made overhead crane and a robotic arm. [ABSTRACT FROM AUTHOR]
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- 2024
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21. Thrust vector control of constrained multibody systems.
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Nguyen, Tam Willy, Hosseinzadeh, Mehdi, and Garone, Emanuele
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VECTOR control , *THRUST , *CASCADE control , *MULTIBODY systems , *CONSTRAINT satisfaction , *FUELING - Abstract
This paper presents a general control framework for the constrained control of multibody systems actuated by vectorized thrusters. A cascade control scheme augmented with a constraint-enforcement unit is proposed to stabilize the system while ensuring constraint satisfaction at all times. The cascade controller consists of an inner loop and an outer loop that are interconnected by a suitable mapping. The inner loop is tasked to control the attitude of the vectorized thrusters. The outer loop is designed to steer the task configuration of the system to a desired pose, while providing to the inner loop the desired attitude through a mapping. To prove the stability of the interconnected system, input-to-state stability (ISS) and small gain arguments are used. All stability properties are derived in the absence of constraints and are shown to be local. Hence, the control scheme is augmented with a Reference Governor (RG) to enforce constraints at all times. Simulations on an unmanned tiltrotor docked to a stationary platform for a refueling operation are carried out to demonstrate the effectiveness of the proposed control framework. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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22. Smart testing and selective quarantine for the control of epidemics.
- Author
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Pezzutto, Matthias, Bono Rosselló, Nicolás, Schenato, Luca, and Garone, Emanuele
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INFECTIOUS disease transmission , *COVID-19 pandemic , *EPIDEMICS , *CONTACT tracing , *STOCHASTIC systems , *STATISTICAL decision making - Abstract
This paper is based on the observation that, during Covid-19 epidemic, the choice of which individuals should be tested has an important impact on the effectiveness of selective confinement measures. This decision problem is closely related to the problem of optimal sensor selection, which is a very active research subject in control engineering. The goal of this paper is to propose a policy to smartly select the individuals to be tested. The main idea is to model the epidemics as a stochastic dynamic system and to select the individual to be tested accordingly to some optimality criteria, e.g. to minimize the probability of undetected asymptomatic cases. Every day, the probability of infection of the different individuals is updated making use of the stochastic model of the phenomenon and of the information collected in the previous days. Simulations for a closed community of 10'000 individuals show that the proposed technique, coupled with a selective confinement policy, can reduce the spread of the disease while limiting the number of individuals confined if compared to the simple contact tracing of positive and to an off-line test selection strategy based on the number of contacts. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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23. A feedback charge strategy for Li-ion battery cells based on Reference Governor.
- Author
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Romagnoli, Raffaele, Couto, Luis D., Goldar, Alejandro, Kinnaert, Michel, and Garone, Emanuele
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LITHIUM-ion batteries , *LITHIUM cells , *CONSTRAINT satisfaction , *GOVERNORS , *GRAPHITE , *CELLS - Abstract
• A complete theoretical analysis of a modified version of the Scalar Reference Gorvernor subjected to OR constraints. • An additional case study has been described to show the effectiveness of the proposed method in a variety of situations. • Experimental validation on a Li-ion graphite/LCO battery. In this paper, we propose a solution for the control of the state-of-charge of a lithium-ion (Li-ion) battery cell. The aim is to design a control scheme able to charge the battery in a fast way while ensuring that the safety constraints of the electrochemical model (ECheM) of the battery are not violated. The proposed solution is based on a novel computationally efficient formulation of the Reference Governor (RG) able to deal with the union of linear constraints and which has been designed on the basis of a reduced ECheM, namely the equivalent-hydraulic model (EHM). Using suitable safety margins, the satisfaction of the constraints on the EHM ensures the satisfaction of the constraints on the full-order ECheM. Simulation results obtained on an accurate simulator show that the proposed method, if compared with classical charge strategies, is able to considerably improve the charge performance while ensuring the satisfaction of the constraints. These findings are validated experimentally on a Li-ion graphite/LCO battery. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
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24. A fast ellipsoidal MPC scheme for discrete-time polytopic linear parameter varying systems
- Author
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Casavola, Alessandro, Famularo, Domenico, Franzè, Giuseppe, and Garone, Emanuele
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PREDICTIVE control systems , *ELLIPSOIDS , *DISCRETE-time systems , *LINEAR systems , *TIME-varying systems , *FEEDBACK control systems , *PREDICTION models - Abstract
Abstract: This paper proposes a fast ellipsoidal Model Predictive Control (MPC) strategy to address feedback regulation problems for constrained polytopic Linear Parameter Varying (LPV) systems subject to bounded disturbances. In order to deal with the specific non-convex structure of the state prediction tubes arising in LPV contexts, a new convexification procedure is proposed and, based on the off-line computation of a sequence of inner ellipsoidal approximations of exact one-step controllable sets, a computationally low-demanding MPC algorithm is presented. Comparisons with state-of-the-art MPC control algorithms for LPV systems are reported in a final numerical example where several methods are contrasted in terms of achievable domains of attraction, control performance, numerical burdens and memory requirements. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF
25. A general ODE-based model to describe the physiological age structure of ectotherms: Description and application to Drosophila suzukii.
- Author
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Rossini, Luca, Bono Rosselló, Nicolás, Speranza, Stefano, and Garone, Emanuele
- Subjects
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DROSOPHILA suzukii , *SCIENTIFIC literature , *COLD-blooded animals , *ORDINARY differential equations , *PHYSIOLOGICAL models - Abstract
This paper introduces a novel general model based on Ordinary Differential Equations (ODEs) which is able to describe the population dynamics of a large class of insect pests. The proposed model is a physiologically-inspired generalization of a number of ad hoc models presented through the years in the literature. Its main feature is that it allows the systematic generation of a population model for a species by simply defining its key features, namely the sex ratio and the development, fertility, and mortality rates. The first part of the paper provides a detailed description of the model and shows that most ODE-based models existing in literature can be obtained as a special case of the proposed model. The second part of the paper shows an application of the model to the spotted wing drosophila Drosophila suzukii , which is a highly relevant pest in agriculture. The biological features of this species, i.e., the sex ratio and the various rates, were retrieved from the existing scientific literature. The obtained model was validated using data from a three-year survey conducted in two experimental fields. Results show that the model describes faithfully the experimental populations, although the simulations were performed completely in open-loop and without any adaptation of the parameters extracted from the existing literature. • Formulation of a novel physiologically-based model describing ectotherms. • A system of ordinary differential equations describes the identifiable life stages. • The model can describe the life cycle of most insect species. • Four models existing in literature can be obtained as a special case of the novel model. • Drosophila suzukii is considered as case study to validate the model with three-year field data. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
26. Reference dependent invariant sets: Sum of squares based computation and applications in constrained control.
- Author
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Cotorruelo, Andres, Hosseinzadeh, Mehdi, Ramirez, Daniel R., Limon, Daniel, and Garone, Emanuele
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INVARIANT sets , *SUM of squares , *SEMIDEFINITE programming , *LYAPUNOV functions , *PREDICTION models - Abstract
The goal of this paper is to present a systematic method to compute reference dependent positively invariant sets for systems subject to constraints. To this end, we first characterize these sets as level sets of reference dependent Lyapunov functions. Based on this characterization and using Sum of Squares theory, we provide a polynomial certificate for the existence of such sets. Subsequently, through some algebraic manipulations, we express this certificate in terms of a Semi-Definite Programming problem which maximizes the size of the resulting reference dependent invariant sets. We then present some results implementing the proposed method to an example and propose some variants that may help in reducing possible numerical issues. Finally, the proposed approach is employed in the Model Predictive Control for Tracking scheme to compute the terminal set, and in the Explicit Reference Governor framework to compute the so-called Dynamic Safety Margin. The effectiveness of the proposed method in each of the schemes is demonstrated through simulation studies. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
27. Safety enforcement in closed-loop anesthesia—A comparison study.
- Author
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Hosseinzadeh, Mehdi, van Heusden, Klaske, Yousefi, Mahdi, Dumont, Guy A., and Garone, Emanuele
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ANESTHESIA , *OPERATIVE surgery , *CONSTRAINT satisfaction , *BLOOD pressure , *HYPNOTISM - Abstract
This paper studies application of different constrained control concepts for the control of Depth of Hypnosis (DOH) in closed-loop anesthesia to guarantee patient safety, while ensuring acceptable tracking performance. The core idea is to formulate Overdosing (OD) prevention and Blood Pressure Decrease (BPD) prevention as operational constraints, and then use a constrained control scheme to enforce the constraints satisfaction at all times. In this paper, three methods are studied: (1) Explicit Reference Governor (ERG), (2) Safety Preserving Control (SPC), and (3) Model Predictive Control (MPC). The performance of the methods is assessed with respect to a simulated surgical procedure for 44 patients whose models have been identified using clinical data. In particular, three realistic clinical scenarios are studied in this paper: (1) normal mode, (2) stimulation, and (3) low clearance. The results demonstrate cons and pros of each method in closed-loop anesthesia according to clinically relevant assessments. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
28. MPC strategies based on the equivalent hydraulic model for the fast charge of commercial Li-ion batteries.
- Author
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Goldar, Alejandro, Romagnoli, Raffaele, Couto, Luis D., Romero, Alberto, Kinnaert, Michel, and Garone, Emanuele
- Subjects
- *
HYDRAULIC models , *LITHIUM-ion batteries , *ELECTRIC vehicle charging stations - Abstract
In this work, we propose and demonstrate two low-computational MPC-based strategies to charge low-capacity commercial Li-ion batteries in the shortest time possible, while limiting the occurrence of degradation mechanisms. To do so, we use a low-complexity electrochemical model (the Equivalent Hydraulic Model, EHM). To reduce the computational burden of the resulting non-convex optimization problem, two approximations of the admissible region are considered: a time-invariant convexification, and a time-varying convex embedding. These approximations are experimentally tested on commercial LCO batteries (Turnigy 160mAh), under controlled ambient temperatures (10, 20, and 30 ∘C) and a non-controlled scenario. They are compared with the Constant Current-Constant Voltage (CCCV) protocol. Experimental results show that the proposed schemes achieve relevant reductions of the charging time with respect to the CCCV in thermal non-controlled and controlled environments. Results also highlight that the time-varying convex embedding does not significantly impact the computational time while further reducing the charging time. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
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