Carpathian Journal of Electrical Engineering

35-45

Authors: Vlad Mihai PANAINTE, Horia BĂLAN

Vibration artefacts that appear at small dimension components are frequently encountered in multiple domains such electronic equipment production, surgical and high precision medical applications, optical applications high quality photo/video equipment. The main objective of this work is to develop a reduced model that accurately represents the dynamics of a small dimension titanium plate and define a suitable vibration control system. With the aid of powerful engineering software instruments, the mathematical model of the studied object is defined with MATLAB after it was modeled and analyzed with ANSYS (mode shape analysis). The mathematical model is developed based on the eigenvectors and eigenvalues extracted from ANSYS and it is called the state space model which is than transformed into a transfer function for simplicity reasons. The mathematical model is than integrated in Simulink and the vibration velocity is evaluated, followed by the definition of a control system comprised of a piezoelectric actuator and PID controller. The evaluation of the system was performed by applying a step signal at the input of the plant and the velocity response is observed comparatively in three configurations as listed: small dimension plate response, plate and piezoelectric actuator and full plant (titanium plate, actuator and PID controller).

62-74

Authors: Nicholas Kwesi PRAH II, Emmanuel Assuming FRIMPONG, Elvis TWUMASI,

An algorithm that modifies the individual experience of mayflies in the mayfly algorithm (MA) to enhance its performance, is proposed. The proposed algorithm called the Modified Individual Experience Mayfly Algorithm (MIE-MA) calculates the experience of a mayfly by finding an average of the positions the mayfly has been to instead of just using the best position. A chaotic decreasing gravity coefficient is also employed to enhance the balance between the exploitation and exploration of the algorithm. The proposed algorithm was compared to the original MA, and two recent variants named, PGB-IMA and ModMA, on eight benchmark functions. The parameters used for comparison were Mean Absolute Error, Standard Deviation, and convergence rate. The results validate the superior performance of the MIE-MA over the other three algorithms. The MIE-MA yields better optimal values with minimal iterations.

92-105

Authors: Mihaela ȘTEȚ, Bogdan CIORUȚA

In the last decades, there was identified evidence of climate change. These climate changes are associated with various effects on different types of ecosystems and with changes in mountain ecosystems. To respond to these challenges, some states have started the implementation of general and specific measures, among them being the measures taken within the energy sectors.

127-138

Authors: Olivian CHIVER, Liviu NEAMT, Mircea HORGOS

The main paper’s purpose is to present how students and researchers can use the ADVISOR software in the design and simulation of electric vehicles. Not only electric vehicles but also hybrid, fuel-cell, or internal combustion engine vehicles can be simulated, this paper refers only to the former. Starting with the principal electric vehicle components such as the energy storage system and the electric motor, the user can choose them from the existing ones in the library or can compose/define new others. The software allows imposing different driving cycles (choosing from the library or user-defined) and calculates selected performances of the vehicle based on the simulation. Should emphasize the eloquent way of ADVISOR in presenting the results on the energy consumption of the main components as well as of the entire vehicle. Thus, it is easy to find how certain equipment affects the overall efficiency of the electric vehicle.

157-163

Authors: Vitalii PANCHUK, Cristian BARZ, Volodymyr KOPEI, Oleh ONYSKO,Iuliia MEDVID,Anatolii PANCHUK, Tetiana LUKAN

Modern technical universities are obliged to show flexibility in the provision of educational services, since the modernization of modern enterprises is ongoing and professional employment additionally requires the rhythmic improvement of skills, skills and educational level of the employee, the permanent acquisition of other additional knowledge and skills that increase the value of the employee in the event of a corresponding need for them applying, as well as obtaining, another profession, if the employee foresees the application of his knowledge at the intersection of different fields of activity. And all this requires enabling the optimization of the provision of educational services by unifying their certain components in order to save its time and financial resources.

174-184

Authors: Iryna SMYK, Liudmyla ARKHYPOVA

The article presents an analysis of electricity use in the tourism sector of Ivano-Frankivsk region. The territorial structure of electricity consumption distribution in the tourism sector across the regions of Ivano-Frankivsk region has been studied, and quantitative indicators of electricity use by the tourism sector over the last five years have been modeled. It has been demonstrated that as the number of tourists increases, the proportion of electricity consumed from the overall energy network also increases, as the share of electricity generated from renewable sources for self-sufficiency of the tourism sector is currently negligible. Analysis of global experience allows us to assert that the use of renewable energy sources is environmentally friendly, modern, safe, and resource-efficient, and is the path chosen by all developed countries. A review of information sources suggests that modern tourism development includes several aspects: reducing carbon footprint, reducing the impact on local ecosystems, and increasing economic benefits for local communities. It is important to understand that expenditures on ecology and nature conservation measures are not just unavoidable costs, but also investments in business. Such an attitude allows for benefits and profits. Investments in green technologies always pay off, as today’s modern tourists are willing to pay for comfort and ecology. The necessity of referring to global experience in using renewable energy sources in tourism is emphasized, and trends in implementing global experience in the practice of tourism industry in Ivano-Frankivsk region are analyzed.

194-207

Authors: Zoltan ERDEI, Cristian BARZ, Alexandru GRIB, Cristina TAMASAN

This paper aims to identify, analyze, and conclude on solutions to improve the energy performance of an economic agent, by carrying out an energy audit to satisfy part of the energy needs of the organization. The respective economic agent operates in the field of the production of devices for the control and distribution of electricity. The objectives of the paper refer to the identification of the way of using electricity, to the identification and analysis of alternative solutions, such as photovoltaic panels, which could substantially reduce energy costs, to the performance of an economic analysis regarding these alternative solutions to determine which are economically efficient for the economic agent in question. The site energy audit was carried out during the week commencing 10th February 2023 and consisted of a health and safety site induction, followed by a kick-off meeting with key site personnel, followed by data gathering and surveys of the factory operation and processes. The objective of the energy survey is to provide a compliant audit for the ESOS submission for the organisation. The energy audit covers all energy consumption applicable to the site in order to establish an energy use map for the major consumers and identify potential energy saving opportunities.The energy savings identified in this study are based on the findings of the site visits and are considered viable opportunities that will require further work to develop them into investment grade business cases.