Studying the principles of converting acoustic waves into electric current and prototyping an acoustic transducer panel, p.2
Students Name: Shakh Oleksii Viktorovych
Qualification Level: master (ESP)
Speciality: Telecommunications and Radio Engineering
Institute: Institute of Telecommunications, Radioelectronics and Electronic Engineering
Mode of Study: full
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: In the master’s qualification work, a prototype of an acoustic wave-to-electricity converter was developed and manufactured. These converters will be used to compose an acoustic panel. The prototype operates based on the method of electromagnetic induction. Electromagnetic induction is the phenomenon of creating a vortex electric field in space due to alternating magnetic flux. This is a result of the connection between alternating electric and magnetic fields in an electromagnetic wave. It also occurs as a practical factor for generating electric current - the emergence of an electromotive force in a conductive circuit when the magnetic flux through it changes[1]. This conclusion was reached by the English physicist Michael Faraday, who conducted several thousand experiments over 10 years to study the conversion of magnetism into electricity. An induction current is an electric current that arises in a conductive circuit when the magnetic flux through the circuit changes due to the phenomenon of electromagnetic induction. An alternating magnetic field induces a current in the conductor that opposes the electric current flowing through it. As a result, the electric current in the conductor gradually establishes itself and only reaches its maximum value over time. Once this value is established, the magnetic field stops changing, and the induction current disappears [2]. In recent years, an increasing number of scientists have been researching the conversion of acoustic waves into electricity. Among them are Steve Dunn from Queen Mary University of London, Chinese researcher Zhanghua Wu from the Technical Institute of Physics and Chemistry, and scientists from the University of Utah. Iranian researchers have also invented acoustic-electric technology [3]. It is also worth mentioning that Ukrainian scientists from Kharkiv National University of Radio Engineering have developed a device for cyclically converting mechanical energy into electrical energy. Most of these scientists are conducting research on the piezoelectric effect and using it as a basis for their work." The production of a prototype electromotive generator and the creation of acoustic panels from such elements can be considered another method for addressing the world’s energy dependence issues. This presents a new alternative for harnessing energy from sound and noise sources. To create such a converter, all necessary engineering calculations were performed, including calculation of theoretically possible data, determination of device dimensions, calculation of element parameters, assessment of electromagnetic converter reliability, and evaluation of device manufacturability parameters. The device is based on a copper coil that oscillates in a magnetic system and is attached to a membrane. A 3D model of the converter was designed in AutoCAD, consisting of two models (the first model depicts the full version of the generator as intended, and the second model represents the designed housing). The housing was printed on a 3D printer, and all necessary components were assembled within it to create a functioning model. Experimental studies were conducted on the prototype, and comparisons were made with theoretical calculations. Measurements were taken using a measuring microphone and the Smaart 8 software. Additionally, we conducted an economic feasibility analysis of the development and manufacturing of this design product (electric propulsion generator), including cost calculations, assessment of the economic effect in production, total economic effect over the product’s lifespan, and overall economic impact. The report consists of 71 pages, 11 figures, 42 graphs, and 11 references. Keywords: acoustic waves, dynamic microphone, sound, noise, energy, electromotive force, Faraday’s experiments, transducer, generator, acoustic panel, electromagnetic induction. References. 1. Physics under the editorship and guidance of Loktev V.M., Baryakhtar V.G., Dovgoy S.O. 2019. 2. Physics for bachelors. Electricity and magnetism(http://physics.zfftt.kpi.ua/mod/book/view.php?id=297&chapterid=47). 3. Prospect of electric generation using sound (https://pubs.aip.org/aip/acp/article/1839/1/020050/845821/Prospect-of-electric-