RESEARCH REGARDING THE CONVERSION OF THE ACOUSTIC WAVES INTO ELECTRICAL ENERGY WITH ELECTROMAGNETIC TRANSDUCERS

Lucian CANDALE, Nicolae FILIP

Abstract


This paper presents research results of laboratory test carried out in order to obtain energy from acoustic waves using electromagnetic transducers. A laboratory stand was made to measure input parameters: voltage oscillations at the acoustic signal generator and output parameters: the received acoustic signal of transducer, voltage and current harvested. Maintaining a constant SPL level was generated acoustic signal in the frequency range 25-103 Hz and was analyzed changes in the power and efficiency caused by construction characteristics of the transducer. Based on the results obtained were also analyzed aspects of signal changes due to structural characteristics of the electromagnetic transducer depending on the frequency sound generated. Have been detailed analyzes of efficiency for acoustic to electrical conversion, electrical to acoustic conversion and overall efficiency conversion for two configurations (AC and DC), where acoustic power is maintain constant. Processing of experimental results have shown that electromagnetic transducers can be used to convert low-frequency acoustic signals with a efficiency up to 15% in the specific test conditions of the designed laboratory system.

Key words: Sound, wave, acoustic-electrical conversion, electromagnetic transducer, energy harvesting, Power, transformation efficiency

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