Studia Universitatis Babeș-Bolyai Engineering

Design of electrical power telemetering system using microcontroller device via GSM

Mohanad ABDULHAMID — 2023-11-15

Traditionally, reading of energy meters is done by human operators who move from house to house collecting readings. This exercise requires huge labor operator numbers and a lot of time to achieve complete reading of meters in a particular area. This paper endeavors to do away with this problem by using a telemetering system. With this system, power can be measured from a remote site. To achieve this, readings from an energy meter on site are processed by a microcontroller device that then sends the energy consumption information to a Global System Mobile (GSM) module. The GSM module then sends this information using microwaves to a particular mobile subscriber who receives it in the form of a Short Message Service (SMS). The reading is also transmitted to a web-based telemetering system through a server. In the remote site, a remote computer which can access the internet is able to obtain data from the server through the internet. The microcontroller is developed in such a way that it achieves communication between the energy meter and the particular server using Transmission Control Protocol(TCP) protocol. Software programs are also developed to facilitate transfer of data to the user at remote site. With the web-based telemetering system connected to the internet, electrical energy measurements can be accessed globally. The efficiency of the transmission channel is important for the success of both SMS and web-based telemetering systems.

Determining the Temperature Using Natural Frequencies and Artificial Intelligence

Alexandra-Teodora AMAN — 2023-11-15

The current paper explores a novel approach for determining temperature variations by integrating the modal parameters and AI techniques. The research focuses on the development of a comprehensive dataset for training an AI model encompassing an analytical method that considers thermal conditions and natural frequencies. Traditional methods of temperature measurement, like infrared and platinum resistance thermometers, often face limitations in terms of accuracy, especially in complex or dynamic environments having an uncertainty of ±3.6°C [1], respectively ±0.2°C [2]. In this study, we propose a methodology that harnesses the inherent relationship between axial loads caused by temperature variations and the change in natural frequencies of a double clamped steel beam. The measured natural frequency data is collected and fed into the AI model, specifically, for a robust temperature estimation, obtaining a maximum predicted temperature deviation of 0.386°C.

Performance Analysis of Fluorescent and Led Lighting Sources

Elisabeta SPUNEI — 2023-11-15

Artificial lighting is a necessity in the conduct of activities, especially at night. The use of fluorescent and LED lighting sources has led to a decrease in electricity consumption compared to incandescent lighting sources. The paper presents a case study highlighting the voltage and current waveforms in the operation of the analyzed sources. A considerable distortion of the current waveform is found, identifying the need for measures to improve power quality. The photometric measurements showed that for some light sources the luminous flux on the box is higher than the luminous flux actually emitted.

High Power System for Acoustic Excitation of Plates

Rusalin Lucian PĂUN — 2023-11-15

This paper introduces a device dedicated to acoustic excitation for modal analysis of plates. A particular setup is requested since the system should produce acoustic excitation with high power in the 10…120 Hz frequency range. The system comprises a signal generator, an amplifier powered by a car starter or a battery, and a subwoofer. This system permits setting the generated frequency around the resonance frequency with reasonable frequency and amplitude stability. We present the system's design and test its performance on a rectangular plate. In our laboratory experiments, we achieved the desired structural behavior.

Crimping Standard DIN vs USCAR Gap Analysis

Florin DRAGOMIR — 2023-11-15

In this paper, the main objective is to present the current status of the automotive specifications related to the crimping process, an in particular how these specifications were adopted by the suppliers of the crimping components (e.g. Terminals and cables). For this reason, we took as reference two of the most worldwide used standards form the automotive manufacturing industry: DIN (“Deutsches Institut für Normung”) with the corresponding Romanian standard SR EN 60352-2:2006 and SAE/USCAR-21 REVISION 3.

Crimping Tool Wear and Tear Analysis

Dacian ILCA — 2023-11-15

This paper represents an investigation into spare parts longevity in the context of automotive production. By systematically examining the accuracy of the crimping process, our research unveils the potential for cost reduction by pushing the limits of the usage of crimping tooling, while maintaining production efficiency and quality. Preliminary findings reveal encouraging prospects, but underscore the necessity for further examinations, maintenance strategies, and the development of predictive models. Through the tests described in this paper and the obtained results, it has been concluded that the limits imposed by the procedure can be extended (thus reducing production interruptions and associated costs). Extending these limits cannot be determined by a universally applicable rule, therefore, additional analyses are necessary, analyses that will be the subject of further research.

Essential Biomechanical Aspects in Athletics

Daniel-Mihai AMARIEI — 2023-11-15

The aim of this paper is to present theoretical aspects of the study of biomechanics in athletics, which is essential for performance optimization, injury prevention, and improvement of athletes’ capabilities. This study contains various research directions in athlete biomechanics as well as biodynamic modelling and simulation in athletics. Finally, aspects of athlete training design and optimization are presented, which are essential for tailoring training programs to the individual needs and goals of athletes.