V I George

System Identification and H∞ Observer Design for TRMS

A dynamic model for the two-degree-of-freedom Twin Rotor MIMO System (TRMS) is extracted using a blackbox system identification technique. Its behaviour in certain aspects resembles that of a helicopter, with a significant cross coupling between longitudinal and lateral directional motions. Hence, it is an interesting identification and control problem. Using the extracted model an H∞ observer is designed which will estimate the states of the system in presence of worst case noise assumed to be impact on the system.

Simulation Study on Closed Loop Control Algorithm of Type 1 Diabetes Mellitus Patients

Abstract It is challenging to maintain normoglycemic range of glucose concentration in type I diabetic patients. In this study H∞ control is applied for insulin delivery to prevent the hyperglycemic levels in a type I diabetic patient. From a control theory point of view, the blood glucose regulation problem is reformulated as a tracking one. A glucose tolerance curve (GTC) validated from several patients is used as reference model. Intra- and inter-patient variability poses a challenging task to control blood glucose concentration in diabetic patients. We develop a data based robust controller to control blood glucose concentration in type I diabetic (TIDM) patients in the presence of meal disturbances under patient—model mismatch. Simulation studies are performed on the diabetic patient model under feedback control. It is seen that the proposed control strategy is able to control blood glucose concentration well within the acceptable limits and also compensate for slow parametric drifts.

Reliable H infinity observer-controller design for sensor and actuator failure in TRMS

Safety critical control systems are used in situations where the failure of a control system due to sensor failure or actuator failure will lead to a loss of life, property or cause environmental harm. A helicopter system really needs a safety critical or reliable control system which faces a lot of turbulent conditions and is expected to perform well, being stable in the case of sensor or/and actuator failures. Also the helicopter system is difficult to model mathematically due to non- linearity and cross coupling. The Twin Rotor MIMO System (TRMS) resembles the helicopter system in behaviour with significant cross coupling between the longitudinal and lateral axes. In this paper an H infinity observer and H infinity controller for a Twin Rotor MIMO System is aimed to be designed which will be reliable in the case of sensor failure or actuator failure also in case of sensor failure and actuator failure.

Implementation of reliable H infinity observer-controller for TRMS with sensor and actuator failure

In this paper reliable H infinity observer and H infinity controller which is designed for Twin Rotor MIMO System(TRMS) is implemented on real Twin Rotor MIMO System. The reliability of the observer-controller is tested on real TRMS with sensor and actuator partial failure and with complete failure. The model used is the identified model for TRMS using system identification technique.

Simulation Study on Type I Diabetic Patient

Abstract Maintaining glucose concentration in normoglycemic range in Type I diabetic patients is challenging. In this study H∞ control is applied for insulin delivery to prevent hyperglycemic levels in a type I diabetic patient. From a control theory point of view, the blood glucose regulation problem is reformulated as a tracking one. A glucose tolerance curve (GTC) validated from several patients is used as a reference model. Intra-and inter-patient variability poses a challenging task to control blood glucose concentration in diabetic patients. A data based robust controller is developed to control blood glucose concentration in type I diabetic patients in the presence of meal disturbances under patient-model mismatch. Simulation studies are performed on the diabetic patient model under feedback control which revealed that the proposed control strategy is able to control blood glucose concentration well within the acceptable limits and also compensate for slow parametric drifts.

Reliable actuators for twin rotor MIMO system

Twin Rotor MIMO System (TRMS) is a bench mark system to test flight control algorithms. One of the perturbations on TRMS which is likely to affect the control system is actuator failure. Therefore, there is a need for a reliable control system, which includes H infinity controller along with redundant actuators. Reliable control refers to the design of a control system to tolerate failures of a certain set of actuators or sensors while retaining desired control system properties. Output of reliable controller has to be transferred to the redundant actuator effectively to make the TRMS reliable even under actual actuator failure.

Performance Evaluation of Reliable H-Infinity Observer Controller with Robust PID controller designed for TRMS with Sensor, Actuator Failure

The partial or complete failure of sensors and actuators used in twin rotor mimo system (TRMS) is considered as uncertainty, which may lead to control system failure resulting in severe damages. Hence there is a need to designed a controller which pe