Revista de Ciencias Tecnológicas

Study and experimental measurement of the drag coefficient of the hull of an underwater drone by means of a wind tunnel

Tue, 14 Jan 2025 00:00:00 +0000

The present work aims to study, design and characterize the hull of a submarine drone by means of experimental measurement in a wind tunnel. For this purpose, the concept design of the prototype was carried out, which was built using additive manufacturing. The experimental runs were performed for two types of surfaces, flat and cylindrical, on the drone hull head. Using the Re determined the test velocities in air were 8, 10, 12, 14 and 16 m/s. From the experimental runs, the drag force, was measured, and from the adjustment, it was estimated that the bias error is less than 6%, so it can be said that the error in the measurements is acceptable, and the scaling of the results can be performed. The results of the drag coefficient showed the reduction by boundary layer growth and from the comparison of the planar and cylindrical gemetires on the dron hull head showed that the of the cylindrical surface is 33.14 and 10.71% larger compared to the of the planar surface. To validate in a better way the obtained results were copared with other designs of hull geometries have a lower , approximately 63.33%, therefore this design does not present the best result in drag comparison with these surfaces, in the comparison with drones that do not have hull and are geometries of rectangular section, 97.48% less drag, therefore it can be indicated that this design has a better performance in comparison with these geometries. Finally, it can be concluded that the geometry proposed in this study has the necessary length to reduce drag due to a boundary layer with a flat surface to have improved performance compared to drones that do not have hull.

Design and manufacture of electric vehicle body with solar panels for urban use

Fri, 17 Jan 2025 00:00:00 +0000

The automotive industry faces the urgent need to reduce environmental impact and mitigate climate change. One alternative in this fight is the use of the urban Electric Vehicle (EV), a compact, low-speed, and more economical vehicle. One of the major challenges is the integration of solar panels into the EV's body to improve its energy autonomy. This work presents the design of an ultra-compact EV body, created in SolidWorks and rendered with 3D Blender software. The area irradiated by the sun is estimated to place flexible solar panels on the hood and roof of the EV and to understand their contribution to the vehicle's energy autonomy. Finally, the manufacturing process of the monocoque fiberglass body is described. The aforementioned concepts aim to make the EV more cost-effective and practical for urban mobility. The plans obtained in SolidWorks provide the measurements and details for both the solar exposure energy calculation and the fiberglass manufacturing process, which includes a model in polystyrene and the body prototype according to the final aerodynamic design. The process highlights the use of clay in modeling the EV instead of automotive clay, which is much more expensive and polluting.

Design and construction of an electrical load simulator prototype using recycled materials

Fri, 21 Feb 2025 00:00:00 +0000

The growing need for skilled personnel within the Federal Electricity Commission (CFE) has highlighted the importance of developing innovative and resource-efficient training tools. This project aimed to design and construct a prototype electric load simulator using recycled materials to address the demand for supplementary training methods. The methodology included selecting and integrating reused components, followed by rigorous testing to validate the simulator's functionality under laboratory conditions. The project's scope extended to the practical application of the simulator in a training session, which demonstrated its effectiveness in enhancing staff understanding of electrical load systems. The results indicate that this approach can significantly contribute to optimizing training programs within the CFE.

The fading of the threshold as a limit between the exterior and the interior in the work of Rogelio Salmona

Edgard Mauricio Carvajal Ronderos — Fri, 31 Jan 2025 00:00:00 +0000

The investigation seeks to find how the architect Rogelio Salmona dilutes the limits of the project and breaks the tradition of the wall which at the same time is a facade, structure, and limit and recognizes the pedestrian is a user of the city’s public space, inviting him to participate in the project, achieving a symbiotic relationship between the public and the private. It achieves this by eliminating the enclosures that give the idea of a ghetto, allowing visitors to travel in all directions; This relationship has nothing to do with the scale or use of the project, it appears in housing complexes, facilities, or single-family homes, so it can be said without fear of being wrong that Salmona works for the city, which understands the pedestrian as its client and not only to those who finance their projects, although most of the time they have differences with them or whit the end users. The methodology used in the research consisted of analyzing how Rogelio Salmona resolves access to his projects, such as their enclosure, the work of the corners, the location of the buildings on the land, and the composition of the façade; the projects were selected taking in to account that they were of different scales and had diverse uses, thus we would verify that the operations correspond to a sought typology and not as a solution to a specific problem.

Chassis design for electric vehicle with hub motors

Thu, 06 Mar 2025 00:00:00 +0000

This article presents the methodological design of chassis systems as part of an integral system that includes several components for an Electric Vehicle (EV). The design includes important factors such as the integration of electric hub motors as the main part of the power system, the design of the components of the suspension and steering systems, as well as the location of the space for the electronic control system, including the lithium battery. The small dimensions of the vehicle play an important role in the design decision for the final product, in order to reduce weight, cost and help with the problem of road and air pollution in highly congested cities. A finite element pre-analysis is contemplated to estimate the resistance and deformations of its main base under static and dynamic impact loads. The chassis is designed for a body in which solar panels must be installed to recharge the lithium batteries used by the hub motors and contribute to the EV's autonomy. It must conclude in a final austere, economical, and practical EV design for urban use.

Methodology for identifying areas with congestion, accidents and dense mobility corridors, by private vehicle

Wed, 05 Mar 2025 00:00:00 +0000

Urban agglomerations that exceed the capacity of services and infrastructure generate negative conditions for the coexistence of population growth and development. They diminish the benefits of living in cities, surpassing the optimal state of space-time relationships in which people carry out their daily activities, such as going to work. In light of the above, this research presents a spatial methodology for analyzing mobility in Mexico City and its relationship with the Metropolitan Zone of the Valley of Mexico, considering two negative externalities of metropolitan traffic: congestion and road accidents. Integrating the assessments of the affected user in direct interaction with these externalities, poured into the Waze Geosocial Network platform, concerning the information from the official databases of governmental and educational institutions, such as the location and size of the Economic Units of the National Statistical Directory of Economic Units, the mobility conditions by private car of the 2017 Origin Destination Household Survey and the extension and characteristics of the 2017 National Road Network. Thus, mobility parameters with spatial interrelation based on Geographic Information Systems are obtained, and average employment magnitudes, congestion, and accident frequencies for different spaces, zoning, territoriality, and time conditions are identified. The dynamics of mobility by private car have a notable impact on road corridors that are related to the central-western zone of Mexico City and in a higher concentration of traffic reports and road accidents, derived from the relationship with the area of continuous concentration of average employment, which demands to be addressed.