Tecciencia https://tecciencia.ecci.edu.co/index.php/TECCIENCIA <p><em>TECCIENCIA</em> is a bi-annual journal concerned with the different problems that science and engineering are facing nowadays. This journal was created in 2006 as a tool to share some of these results with an increasing audience that is interested in finding out about the advances in engineering in Colombia. We are currently moving towards reaching a broader, international audience in order to make a deeper contribution to our scientific understanding of the world. This journal is intended as a medium for publishing highly innovative, high-impact results. Our scope is broad and includes many topics of increasing interest regarding environmental, mechanical, electronics, biomedical, process, electric, software, energy engineering and applied sciences.</p> Universidad ECCI en-US Tecciencia 1909-3667 Shading simulation for two photovoltaics solar generation residential systems (SPV) using SAM (System Advisor Model) https://tecciencia.ecci.edu.co/index.php/TECCIENCIA/article/view/102 <p>In this document, shading models are developed for photovoltaic solar generation systems located in two environments, a rural one, in the Cundiboyacense savanna, and the other one within the con-urban area of the Colombian capital. Both systems consider a typical electrical load for an average home. The photovoltaic generation systems and their components are dimensioned based on this estimation, for which, in this case, there are not considered any battery energy storage system. Shading on the panels is done using SAM, inserting objects of considerable height in both environments. The results of this modeling confirm that indeed, power losses are greater when considering the area of panels affected by shade. Therefore, a comparative simulation case is presented for the two considered environments, including and excluding losses due to the effect of shading, and the respective conclusions for this research are finally written.</p> Daniela Nolasco Sebastian Solis Copyright (c) 2021 Tecciencia 2021-02-24 2021-02-24 16 30 15 34 COVID-19 virus behavior simulation model: Case of study Bogotá, Colombia https://tecciencia.ecci.edu.co/index.php/TECCIENCIA/article/view/115 <p>The purpose of this article is to present a prediction on the epidemiological behavior of the COVID-19 virus for the city of Bogotá, Colombia and determine the possible incidence of the different restriction measures. Material and Methods: a dynamic model based on state information was built for all the analysis variables in the framework of a SEIR model. Results and Conclusions: it was determined that the incidence of effective isolation measures significantly affects the behavior of the disease. Results are presented for two different scenarios, with their respective sensitivity analysis using the Monte Carlo method. It is concluded that it is necessary to increase testing and reduce the time needed to get the results. It is also crucial to generate and deploy social policies that make the fulfillment of an effective quarantine possible. Finally, the restrictions of the model for decision-making in terms of public policy are shown.</p> Diomedes Arnoldo Sandoval Muelas David Ricardo Pedroza Martínez Diego Fernando Casas Pérez Ivanov Alexander Pineda Rincón Julio Eduardo Beltrán Vargas Copyright (c) 2021 Tecciencia 2021-04-19 2021-04-19 16 30 35 50 Operation of DC Motor with Multi-Level Inverter in PWAM Method https://tecciencia.ecci.edu.co/index.php/TECCIENCIA/article/view/99 <p>DC motor control with switching methods is an interesting devise with many<br>practical applications. A DC-DC buck-boost converter is one of the methods used to operate the DC motor. Although the-DC buck-boost converter for dc motor applications has been widely studied, they have some handicaps. In this study, the multi-level inverter structure that is different from the methods of DC motor driving is used to drive the DC motor. There will<br>be no passive elements in the proposed circuit although the dc-dc converters have passive elements. So, while the inadequacies for the loads needing high current will be eliminated, the handicaps of the switching can be<br>avoided. Current, torque, and voltage on the load will also be created by Pulse Width Amplitude Method (PWAM). As a different from other Pulse width modulation methods (PWM); the torque, current, and voltage of the<br>motor can be controlled with PWAM in the horizontal and vertical axes. In the design stage; inverter switch structure and operation are given after the method of produced PWMs introduced. The equations of the voltages<br>that will occur in the loads are created according to the working structure of the switches. DC motor structure is also given. In the simulation stage; Continuous and discontinuous modes of the proposed circuit are performed.<br>Then torque of dc motor, armature current and speed are tested according to switching at different frequencies and different modulation indices.</p> Erol Can Copyright (c) 2021 Tecciencia 2021-02-17 2021-02-17 16 30 1 14 Design of an Audio Compressor with Digital Control https://tecciencia.ecci.edu.co/index.php/TECCIENCIA/article/view/118 <p>Based on the concepts and insights of cybernetic theory and the applications of applied electronic engineering and control, this article deals with the<br>design of an analog compressor with digital control. The main purpose of the device is to control the basic parameters of hardware using an application on a micro-controller. The advantage of that design is the possibility of store the different analog positions into a digital position of the memory of<br>the micro-controller, in order to call these presets whenever is needed. Further possible applications include the virtual-remote monitoring of events<br>where the interaction between artist and sound engineering is required</p> Jonnathan Montenegro Copyright (c) 2021 Tecciencia 2021-05-28 2021-05-28 16 30 51 64