The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes the optimization of a GMM system for the automatic recognition of numerical commands of voice using Chaotic Particle Optimization (CPSO). In addition preprocessing the speech signal with mel-frequency cepstral coefficients, we use the discrete cosine transform (DCT) to generate a two-dimensional temporal array used as input to a GMM system to generate the pattern of the words to...
This paper addresses the modeling and control of the More Electric Aircraft (MEA) system used in modern airplanes in real time simulation environment. In particular, this paper examines the effect of replacing the conventional gas turbine based Auxiliary Power Unit (APU) system with a fuel cell based APU system. The voltage dynamics in the aircraft electric microgrid system and impact of the fuel...
We report the results of the application of the Model-based Predictive Control (MPC) algorithm for a 3×3 MIMO balls mill grinding system by using computational simulation and Monte Carlo data generation. For this purpose, the system has been identified through a reduced scheme of Volterra formalism by which the proposed methodology has required to employ up to 20 parameters. Subsequently, the model...
This paper presents an output-feedback sliding mode positioning controller that can damp resonant modes in DC motors. Ironless (also known as coreless) DC motors have several attractive advantages over conventional DC motors. However, undesirable resonant effects may arise at certain frequencies impairing the closed-loop control performance. To deal with uncertainties, disturbances and to damp resonant...
The Algebraic Riccati Equation (ARE) has increasingly played its role for the optimal control theory [1], [2]. Adaptive filters have been a widely used technique in the context of real time solution for ARE [3]. The least mean square (LMS) and the recursive least square (RLS) are among the most well known filters [4], [5]. Nevertheless, these algorithms have a lower learning rate for multivariable...
Repetitive control (RC) is a widely used effective approach for periodic reference tracking and periodic disturbance rejection. In this paper, its use for periodic disturbance rejection and piecewise constant reference tracking is analyzed in a continuous-time framework. First, two previously proposed repetitive control structures, namely the basic repetitive controller and the current iteration repetitive...
Recently, DC microgrids have become a viable option for mining distribution systems. Fault diagnostics and protection are known challenges in DC microgrids. In this paper, we present an overview of the existing strategies for fault diagnostics and protection of a DC microgrid and apply them to an open cut DC mine scenario, which includes large electric excavators. We propose a comprehensive fault...
This paper proposes a new closed-loop synchronization algorithm, PLL (Phase-Locked Loop), for applications in power conditioner systems for single-phase networks. The structure presented is based on the correlation of the input signal with a complex signal generated from the use of an adaptive filter in a PLL algorithm in order to minimize the computational effort. Moreover, the adapted PLL presents...
This paper presents a new proposal of combining a FACTS device with the fixed speed wind turbine (FSWT) to meet the restrictions found in upcoming grid codes. The applied FACTS device is based on the control strategy of the Dual Unified Power Quality Conditioner - the iUPQC. The power stage of the iUPQC consists of two converters connected back-to-back. One of them is connected in series and the other...
There are around 68 millions of wheelchair users in the world. And 49.2% must use steps to enter or exit their homes, in the USA. But only a few successful stair climbing wheelchair models or middle scale robots have been built. A low cos stair climbing wheelchair is here proposed. The wheelchair is powered by a system which enables it to have smooth motion on flat surfaces and has the capability...
The purpose of this paper is to present the development and testing of an autonomous robot for the sumo competitions. The robot aims is to find your opponent in the ring and force it out of the demarcated area while it should not go out on their own. To achieve task the robot was developed using infrared reflection sensors to determine the position of the opponent and its position in the ring. It...
Power plants employing renewable energy sources connected to large power systems continue increasing their number and size. PV and wind farms are a clear example of this trend. They employ power electronics in order to inject power in the grid and in most cases the interaction does not take into account the power system needs. However, as their size increases, these plants should support the grid...
In this paper, a new controller approach for unified power flow controller (UPFC) is proposed to improve the low-voltage-ride-through (LVRT) capability of a DFIG-based WECS during voltage sag. The shunt and series converters of the UPFC are controlled using a hysteresis current controller (HCC) and proportional integral controllers (PI), respectively. Detailed simulation is carried out using MATLAB/SIMULINK...
The paper addresses the problem of kinematic modeling and control design of a multifingered robot hand. The fingers are modeled as independent serial manipulators and the kinematic constraints are derived from empirical observations due to the complex structure of the mechanism. The pose control problem for the fingertips is solved by using the kinematic control approach, which ensures the asymptotic...
During the commissioning phase of production systems the identification and correction of malfunctions is a tedious task mainly done manually by commissioning engineers. This task is of high importance because missed malfunctions may result in hazardous behavior during operation phase. At this point, regardless of the engineers expertise a systematic support can drastically decrease the risk of missed...
Sign language is the basic communication method between deaf people. A translator is usually needed when an ordinary person wants to communicate with a deaf one. This paper presents a system for sign language recognition of Mexican sign language to Spanish oral language. In sign language recognition, there are important challenges as to develop methods that solve signer-independent continuous sign...
Frequency response analysis (FRA) has been employed as an effective tool for the detection of various mechanical winding and core deformations within electrical power transformer. Traditional FRA signature interpretation relies on the magnitude of the FRA plot although all practical frequency response analyzers are able to provide both magnitude and angle of the FRA signal in wide frequency range...
This paper proposes a source localization method based on blind source separation, which can be applied to locate multiple simultaneous acoustic sources in a reverberant environment. The proposed system uses the signals acquired by a set of microphone arrays, applies a blind source localization algorithm to obtain the direction-of-arrival (DOA) of each source-array pair, and combines the results to...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.