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As the Linked Data paradigm is embraced by a growing number of data providers (and consumers), the count of publicly available, semantically-annotated resources is systematically increasing. Here, elasticity and extensibility of semantics, enmeshed in Linked Data principles, and technologies supporting them, starts to attract application developers. In this context, multitude of developed ontologies...
In this paper the reaching law approach to designing sliding mode controllers is used. In particular, the case of switching variable of relative degree r > 1 is considered. It is demonstrated, that the use of such a variable allows more freedom in designing the controller and can result in reducing the maximum absolute value of the control signal without compromising the robustness with respect...
This paper proposes a Petri Nets based modeling of discrete event systems (DESs) that includes complex temporal constraints. State evolution in DESs depends on the occurrence of discrete events over the time and consequently on temporal information between tasks. The contributions of the paper are to transform Business Process Modeling (BPM) that deal with such constraints into PNs and to propose...
This paper focuses on the design of a linear Kalman filter and an extended Kalman filter for the estimation of an octorotor unmanned aerial vehicle's (UAV) state in the context of Synthetic Aperture Radar image reconstruction. A comparison to a linear interpolation method is also proposed. The Kalman filters are developed based on a complete nonlinear model of the UAV and its linearized form. A particularity...
Processes showing an initial response that is opposite to the final steady-state are present in industrial applications. Control of such processes involves difficulties and recently researchers have started paying great attention to the control of such processes. This paper reports on deriving optimal tuning rules for controlling integrating processes with inverse response. Simple and optimal analytical...
Distributed model predictive control (DMPC) for thermal regulation in multi-zone buildings continues to gain attention over centralized approaches. Particularly, centralized control approaches have been shown to become impractical when applied to large-scale buildings due to for example, computation complexity, modeling complexity of large buildings and availability of required sensor and actuator...
For processing purposes of silver colloidal suspensions in view of specific applications, this study evaluates the suitability of using alginate/lignosulfonate mixtures as an efficient dispersion matrix for the silver nanoparticles. The rheological behavior of the in situ obtained silver nanoparticle suspensions was investigated by rotational measurements performed using cone-plate geometry, considering...
Recently Ntogramatzidis et al [1] gave a design method for a linear time-invariant state feedback controller to monotonically track a constant step reference at any desired rate of convergence for any initial condition. In this paper we describe a new public-domain MATLAB® toolbox to implement this control scheme. The toolbox enables interested users to implement the controller design methods of [1]...
Unmanned Aerial Vehicles (UAV) have found many applications in the areas such as remote sensing, surveillance, filming, and other scientific research. Due to the fact that multirotor UAVs are unstable systems in nature, feedback control is paramount in ensuring successful flight missions. Hexacopter is a type of UAV that is capable of carrying heavier payload with increased stability while being less...
In the last years the European Space Agency (ESA) has developed several programs that support the creation of small satellites, called CubeSats, by different universities from within the member states. Because of their limited size, those satellites can pack, at most, very small attitude control devices which can generate only some limited torque. It is thus important for the designers to be able...
The unmanned multi-ducted-fan flying vehicle is a kind of novel multi-purpose platform for future transportation. In this paper, flight dynamics model is established based on aerodynamics principles and rigid body dynamics theory. To make the controller of the multi-ducted fan flying vehicle more robust, a double closed loop PID controller is put forward with non-smooth parameters optimization method...
A switching adaptive controller is proposed to control the phase currents in brushless DC motor (BLDCM) drives. After deriving the error dynamics, the conduction and commutation periods of the drive is taken into account separately, and two different controllers are designed for each operation region of the current loop of BLDCM drives. All the system constants in the dynamical model of the drive...
The aim of this paper is to present a comparative study of a set of neural network based controlling methods for the pitch angle of an aircraft. The investigated methods can be classified in two categories: the first one is based on direct and inverse offline neural modelling of the process, while the second one is based on the online training of a neural controller and on the online self-tuning of...
The paper presents an original method for controlling the real power delivered by a hydroelectric power plant to local electrical grid. The advanced control is based on: the implementation of the Internal Model Control strategy in order to obtain the system stabilization and robustness; the implementation of two feed-forward loops in order to reject more efficiently the effect of the disturbances;...
In this paper, the main purpose is to design the model of a given mechatronics line, composed by several workstations and serviced during the recovery, transport and return of a work piece by a Wheeled Mobile Robot (WMR) which has mounted a Robotic Manipulator (RM). The work piece to be transported has been initially tested and did not pass the quality test. In this context, the Processing/Reprocessing...
Extending the high frequency microwave domain of measurements increases the time needed for a complete measurement. For this reason, many algorithms were developed to reduce the acquisition time, but the unpredictable behavior of the microwaves limits the possibilities. Frequency sampling algorithm presented in this paper describes the correlation between finding optimal distribution of the minimum...
Reaching law approach is a straightforward method of ensuring the desired dynamic response of a variable structure system. In our paper, this method is used to design a new non-switching type discrete time sliding mode control strategy. The strategy is shown to ensure a finite time reaching phase, stability of the sliding motion and bounded convergence rate of the sliding variable to the vicinity...
Home Automation Systems have been continuously evolving in the past few years: some of the systems are focusing their attention on providing remote access and control of the system, while others are more focused on the interconnectivity of the devices and on integrating them into greater systems, like smart cities. In this paper we propose a hierarchical architecture for Home Automation Systems, which...
A cruise and headway control strategy using distributed model predictive control, developed for a vehicle platooning application is proposed in this paper. The cruise control (i.e. driving the vehicle with a constant velocity demanded by the driver) is designed for the platoon's leading vehicle, whereas for the rest of the platoon, a headway control strategy is developed. Thus, the control objective...
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