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In this work, a pilot study of on-line automatic detection of human activity in home using wavelet and hidden Markov models Scilab toolkits was carried out. The collected raw data are provided by a biaxial accelerometer ADXL202E attached to the person. Several activities were simulated by the researchers (walking slowly , walking quickly, sitting down-getting up, fall during walking, fall from a position...
In this paper, a nonlinear control technique based on the property of flatness is proposed to control the air system of new generation diesel engines. The simulated engine is equipped with variable valve actuation (VVA), variable geometry turbocharger (VGT) and exhaust gas recirculation (EGR). The control objective is to achieve tracking of suitable references of flat outputs with corresponding intake...
The present paper is focused on thermal comfort control for building occupants. Thermal comfort is addressed here by the use of PMV index for such measurement. Based on PMV, two predictive strategies characterized by having terminal constraints are proposed and compared. The first is based on generating a temperature set-point signal that optimizes the building (single zone) internal PMV value. The...
One of the most important problems that can arise in the development of a pharmaceutical crystallization process is the control of polymorphism, in which there exist different crystal forms for the same chemical compound. Different polymorphs can have very different properties such as bioavailability, which motivates the design of controlled processes to ensure consistent production of the desired...
In this paper, an extended internal model control (IMC) scheme for a sensorless force control on an uneven surface is proposed to such kind of surface-polishing, deburring and rubbing machines. The IMC controller scheme has disturbance decoupling property, good tracking performance and disturbance estimation property. In order to extend the conventional IMC scheme to force control on uneven surfaces,...
In this paper, a new data-driven model predictive control (MPC) is considered based on a bilinear subspace method. Being a subclass of nonlinear systems, bilinear system is useful to approximate a class of nonlinear systems and implement predictive control in many circumstances. Therefore, a bilinear predictive control is implemented by exploiting the structural properties of the identified bilinear...
Optimization techniques have been a crucial tool for designing control systems and for tuning controllers. The always increasing quality requirements for new products and consequently the natural advance in control system design have lead to the introduction of more than one design criterion, which will require in turn more sophisticated techniques to solve such Multi-Objective Optimization (MOO)...
A new fuzzy increment inverse control based on input/output fuzzy hyperbolic model is proposed for general unknown nonlinear discrete-time dynamical system in this paper. The increment inverse controller is derived from the input/output fuzzy hyperbolic model, and it is based on property of hyperbolic tangent function and reduces the complexity of system. The stability of control system is derived...
In this paper a fault detection and isolation (FDI) method coupled with a fault tolerant control system are developed in order to deal with control surface failures for an Unmanned Aerial Vehicle (UAV). The failures considered are stuck control surfaces which occur during the aircraft manoeuvres: turn, velocity and slope variations. These faults are difficult to detect and to isolate. On the one hand...
The paper studies the problem of fault detection for a class of uncertain state feedback tracking control systems with constant reference inputs. The considered systems are modeled via multiple modes, namely, nominal case and faulty case. The actuator stuck faults are considered. With the aid of the finite frequency positive-realness approach, a new LMI-based fault detection method for the control...
In this paper a control synthesis approach is presented for supplementary controllers in electrical power systems, with the goal of damping low frequency oscillations. The approach is based on restricted dissipativity and the generalized Kalman-Yakubovich-Popov (GKYP) lemma. The proposed synthesis approach is used to design a "power system stabilizer". The resulting controller is tested...
In this paper, the problem of actuator fault detection and isolation (FDI) for almost-lighter-than-air-vehicles (ALTAVs) is investigated using a nonlinear geometric approach. Due to the particular dynamics of the ALTAV, six detection filters are designed for FDI of the four input channels of the ALTAV. Four of the detection filters are designed such that each input channel affects only one of the...
In semiconductor manufacturing process, the thickness and extinction coefficient are two important properties of photoresist which need careful estimation and control. Wafer warpage is common in microelectronics processing due to stress induced. In this paper, the effect of warpage on the accuracy of resist properties estimation is investigated and an in-situ calibration method is proposed. We will...
This paper presents a new nonlinear coordinated control strategy for overcoming the influence of process nonlinearities and improving the load-following capability of coal-fired boiler-turbine units. A feedback linearization law is deduced via the dynamic extension algorithm of vector relative degree for a typical boiler-turbine unit model. By the law, exactitude feedback linearization in universal...
This paper deals with the critical problem of actuator limitations for the successful implementation of active surge control. We specify the capacity, bandwidth and allowable time delay for a control valve that can be used to actively suppress surge in a specific full-scale centrifugal compression system. The actuator requirements are obtained from closed-loop simulations with a nonlinear simulation...
In this paper, the open problems and applications of a daisy chaining visual servo control strategy are given. This paper is Part II of Hu et al. (2007) in which a tracking problem using the daisy chaining strategy is addressed. The main idea of the daisy chaining strategy is to use multi-view geometry to relate coordinate frames attached to the moving camera, moving planar patch, and the desired...
For underwater and aerial images, the dispersing in atmosphere and the fluctuation in current flow are essential factors to consider. It is evitable that these types of images will be affected by uncertainties. As a result, image segmentation is especially useful for the processing of underwater and aerial images. Segmentation acts as a basic approach to clarify both feature ambiguity and information...
In this paper, a tool for design of decentralized controllers for irrigation channels is developed. A physical model of the channel is obtained using the St. Venant equations, and a data set is generated by simulating this model. A first order nonlinear model useful for control design is then estimated from the simulated data using system identification techniques, and a controller is designed based...
The mineral grinding process is an important procedure in the mineral processing. Its technical performance index is the particle size, which is closely related to the overall performance of the mineral processing. In this paper, we present the construction of a software platform of the supervisory control of the grinding process to control its particle size into the target range. The platform provides...
This paper presents a robust actuator fault reconstruction scheme for linear uncertain systems using sliding mode observers. In existing work, fault reconstruction via sliding modes is limited to either linear certain systems subject to unknown inputs, relative degree one systems or a specific class of relative degree two systems. This paper presents a new method that is applicable to a wider class...
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