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In this article an investigation is presented, where factors influencing temperature and humidity ariables in a temperature controlled chamber are analyzed. The objective of this study is to determine whether the humidity can be controlled independently of temperature in order to implement a change in the system to stabilize the relative humidity. After showing the theoretical background, the changes...
This paper presents an expert system which provides a graphical report that correlates strain signals with maintenance tasks. The considered maintenance tasks are related to the repairing of cavitation effects in hydropower turbines. By using simulated data, the performance of the proposed systems can be assessing. In sum, this work displays the usefulness of experts systems to make the supervision...
We study a simple proposal to improve the response time of emergency vehicles using VANETs. Emergency vehicles broadcast messages to alert of their presence to drivers of private cars and traffic lights. We assume that private cars immediately allow emergency vehicles to surpass them and traffic lights change their state accordingly. We analyze the convenience of such a system by means of simulations...
Now, the devices that can to be connected to internet are increasing, this has allowed to develop new technological innovations in automation and domotic fields. This paper presents an application of Internet of Things (IoT) applied to domotic, in which a domotic network for control and monitoring has been designed and implemented. In the implementation process different electronic modules low cost...
In recent years, the use of video storage systems have increase radically. Generally, this records are used for surveillance tasks and allow monitoring activity in particular areas, track certain situations or analyse information from incidents. These systems store large amounts of data and the greatest part of the records have irrelevant information, generating an unnecessary demand of time and money...
Nowadays in optical communications, equalizers to compensate chromatic dispersion have a large impulse response and throughput, therefore the VLSI implementation of this filters are carried out in frequency domain to reduce its complexity and thus achieve a lower power consumption. Designers facing developments of frequency domain filters have defined in advance the throughput and the impulse response...
Time-delay processes are frequently found in industry and the most common representation is a first order plus delay time (FOPDT) transfer function. The most used controller is the PID and the negative effect of the time delay in the closed loop system response is known. The most common way to attenuate the effects is by selecting a low proportional gain, degrading the response. If the model of the...
The design of a physical interface between resident smart mobile devices with Android Operating System and Sensor Networks (WSN) is presented. Through the Open Accessory protocol available on Android, the different layers of software available under the Development Kits are evaluated by identifying access to the sensors available on the device. Finally functional tests are performed with a Zig Bee...
A geometric approach of the well known winding-function approach for the calculation of electric machine inductances is presented in this paper. An elementary induction machine is used in order to validate the proposal.
In this paper, a model for target tracking with data fusion taken from inertial and altimeter sensors for a quadcopter is proposed. With some environmental restrains and using INS/altitude data, the new position and template changes are predicted. The model dynamics is estimated on the basis of the specifications of the UAV IRIS+, with a pointgrey blackfly camera (PGE-13E4C-CS), a gimbal (TAROT 2D),...
A design of a MOS Gilbert mixer cell intended for LTE band 28 is presented in this work. The objective is directed to a design with low noise and low third-order intermodulation distortion. The designed mixer can be used in a fully-differential chain, avoiding the implementation of a balun. Since the overall IP3 of a full front-end depends on the IP3 of the each stage, specially those behind the low-noise...
An energy management control strategy for a stand-alone photovoltaic system is presented in this paper. The system consists in a photovoltaic panel connected to a Boost converter, an auxiliary battery powered by a bidirectional Buck-Boost converter and a resistive load. The purpose of this control strategy is to keep the Dc-link voltage on a reference value under load variations and changes in the...
We propose the development of a printed logoperiodic antenna, by combining the operating principles of the conventional logoperiodic with the construction technique of printed microstrip. Hence we obtain a compact design and small size antenna whose frequency response is within the expected bandwidth. This antenna will be used in conjunction with a detector device for true RMS values of RF signals...
Application of Optimal Control Laws in autonomous systems with finite energy sources, such as freestanding and aerial robots, is a real need for today. This paper presents a finite horizon optimal controlled design with fixed initial and final states, for such complex and autonomous self-propelled systems. While its design methodology is well known, inconsistencies and singularities may occur in the...
In this paper a weather system developed for crop protection in rural areas is presented. The system consists of mini weather stations that are commanded by a central station which processes the data collected and based on these, it generates alarms, either by falling frost or the appearance of Zonda winds. The system, in addition to the occurrence of Zonda winds can predict with several hours in...
This contribution aims to introduce the design, implementation and validation (measurement) of a two-element antenna array for full-duplex relay applications. The antenna array is designed to provide a large isolation between transmission and reception links which is obtained by changing the polarization of the channels and by designing a suitable radiation pattern of the transmission antennas. The...
In this paper an optical fiber Fizeau interferometer is used to obtain dimensional changes that occur during the solidification process of photocurable polymers, even if there is a reversal of the corresponding deformation. The simultaneous detection of both temporal and spectral evolutions of the interferometric signal allows recognizing the existence of thermal or mechanical processes by detecting...
This paper deals with control objectives with application to robotics. Automatic control systems are designed to meet desired specifications — control objectives — for the system to be considered adequately controlled. The contribution of the paper is the introduction of a new concept regarding a control objective based on: closed-loop Total Energy Function with Damping Assignment (TEFDA) which has...
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