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This paper presents a lambda tuner tool for the analysis and the design proportional-integral-derivative (PID) controllers using Matlab/Simulink software. The proposed application allows the user to easily obtain control parameters with lambda method and several traditional tuning methods. The lambda method guarantees robustness, stability and non-oscillatory response. It should be noted that the...
This paper presents a non-linear control approach to control a direct rotary dryer. The aim is to control the air temperature inside the dryer, in order to dry particles of biological origin, such as fish meal or soy meal. For this purpose a two-stage control technique will be proposed, the first part is a non-linear control based method and second an IMPC control. In order to control the output air...
This paper proposes methods for improvement electrical grounding systems performance. There is a intense need for efficient electrical protection systems, to protect people and property against electric currents discharges, thus adding improvements to electrical grounding systems already in use. Based on this principle, this work is divided in: i) soil resistance values variation, due to different...
This work proposes an analytical method for calculating sensitivity index. The proposed method is based on one-at-a-time measurements and calculates the difference between output values and the base solution to define the impact caused by each parameter in the system. The results indicated that the analytical method provides adequate values for the sensitivity index even when the parameters have minor...
The aim of this paper is to introduce a semantic methodology using ontology in order to improve results of data mining in judicial decisions database. An intelligent and automatic method to search for sentences in lawsuits related to the one in trial is presented. A judicial ontology is built with and without rules from experts. The method can provide judiciary celerity, seeking to solve the yearning...
Industrial production systems for smart factories or the so-called Industry 4.0 will demand high interoperability and connectivity between production modules, so that modules could be monitored in real-time. Production modules should make decisions on their own, with no human intervention, they must be modular and adaptable to changing circumstances and customers' requirements. The autonomous operation...
In this article we present the process of dimensioning the main elements of the wind turbine, on all the elements that are subjected to a rotation, to be assembled all the elements and assemble the wind turbine DIAWIND-A2. This wind turbine was built to supply power to rural homes and has the ability to self-position after census of the direction of greater wind flow through a weather vane. Wind turbines...
Several studies and projects carried out at the University of Valparaiso are focused on the condition of the elderly, particularly those who present conditions of vulnerability and deterioration. In this context, the actions of the academy are consistent with the policies defined by Chilean Government. This is generated by the current conditions of demographic and epidemiological transition, which...
This paper analyzes the characteristics and functions of exoskeleton-based rehabilitation systems, detailing the reasons why a person tends to use prostheses and the risks to which a person is exposed when suffering an amputation in their body. We show the development of an exoskeleton prototype with adjustable measures for children from 2 to 4 years of age, using embedded electronic systems for the...
In recent years, the use of non-conventional renewable energies, particularly photovoltaic solar energy, has been growing steadily in the country and is currently a real alternative to collaborate in the production of energy required by the national industry. Motivated by the above is that the study and development of technology in Chile for this energy opportunity is fundamental at the present time...
Detecting communities in non-trivial networks is a hard task that has been attracting the attention of many researchers in the field of complex networks. When the network has identical and non-overlapping communities, however, one could expect this task to be easy. We show in this paper that, surprisingly, it is not the case. For this purpose, we carried out a controlled experiment in which 9 well-known...
In this paper a 27-Level Asymmetric Multilevel STATic COMpensator is presented aimed to compensate reactive power. The STATCOM is controlled with a master-slave approach, where the master loop is responsible to regulate the DC voltage using a Proportional-Integral controller, while the inner loop is in charge to track the reference currents through a Proportional-Resonant control block. The presented...
This work presents a sweep for the modulation index in a 27-Level Asymmetric Multilevel Converter that uses the Selective Harmonic Elimination modulation technique. Different set of solutions are obtained and presented in order to define the value of the firing angles for the multilevel waveform as well as the value of the modulation index. The number of levels in the converter decreases when the...
The classic model predictive control presents a variable switching frequency which could produce resonances in the input filter of the matrix converter, affecting the performance of the system. In this paper a model predictive control strategy is proposed with fixed switching frequency operation which is enhanced with an active damping method in order to mitigate resonances of the input filter. The...
Matrix converters are devices that allow the management of bidirectional flows of energy, reduced size, increased useful life and high efficiency in wind schemes. In this paper we present the experimental results obtained after the application of a predictive current control technique for two matrix converters feeding isolated loads. One scheme is based on IGBT technology and the other on SiC-MOSFET...
Monoculture in a computer network is defined as executing the same protocols and software on all the networking devices. Multiple, correlated failures may be triggered in a monoculture network by attacks that exploit existing vulnerabilities in either protocols, software, or hardware. In this paper, optimal multiculture network design is used to improve the network reliability in the presence of correlated...
The biological treatment of industrial waste is a priority theme for the sustainable development of any society. In recent years, there has been a significant increase in the study of the efficiency and reduction of the energy costs of this process, as active sludge treatment plants are characterized by a high cost of aeration. This study aims at modeling an active sludge treatment plant based on...
This paper proposes an algorithm for QRS-complex onset detection in single channel ECG signals based on the first differential of the ECG signal and an adaptive baseline estimation. The proposed algorithm was developed and tested using the Physionet QT Database. A 100% detection rate on the onset of the QRS complex, with a mean error±(standard deviation) of −0.48±(11.26) ms was achieved against the...
Localization is one of the main tasks of autonomous mobile robots. There are many approaches on how to determine the robot's position with reasonable precision, as with the use of sensor fusion (IMU, GPS, Image, LiDAR). Even though it is possible to achieve high precision with these sensors combined, a solution that requires less resources in terms of processing, energy consumption and yet provide...
The measurement of consumption of public services such as drinking water and electric energy, and information management is one of the problems facing intelligent cities. In this article we describe the design of a computer system that allows the management and administration of consumption records made by smart meters that communicate through MQTT using mobile telecommunications networks. The results...
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