N2 - Most of sound sources are complex vibroacoustic objects consist of numerous elements. Some coupled vibrating plates of different shapes and sizes can be easily found in urban environments. The main aim of this study is to determine the sound radiation of coupled plates system of practical importance. The investigated vibroacoustic system consist of a thin circular plate coupled with a thick flat baffle with a circular hole. The circular plate has been mounted to the baffle’s hole using screws and two steel rings. The measurement setup was located inside a semi-anechoic chamber to assure the free field conditions. It was necessary to take into account the whole system surface to obtain the radiation efficiency based on the Hashimoto’s method. Such an approach can be troublesome and time-consuming. Therefore, the criterion has been proposed which allows the vibration velocity measurements and calculations to be performed only for the thin plate’s area. An alternative approach has been proposed based on the classical Rayleigh integral formula. Its advantage is a simpler implementation in a computer code. The obtained results have been compared with the theoretical results obtained for the elastically supported circular plate. A good agreement has been obtained at low frequencies. L1 - http://czasopisma.pan.pl/Content/108113/PDF/123913.pdf L2 - http://czasopisma.pan.pl/Content/108113 PY - 2018 IS - No 3 EP - 423 DO - 10.24425/123913 KW - radiation efficiency KW - measurements KW - Hashimoto’s method KW - coupled plates A1 - Rdzanek, Wojciech P. A1 - Szmela, Krzysztof A1 - Żyłka, Wojciech PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 43 DA - 2018.09.25 T1 - The Radiation Efficiency Measurements of Real System of a Thin Circular Plate Embedded Into a Thick Square Baffle SP - 413 UR - http://czasopisma.pan.pl/dlibra/publication/edition/108113 T2 - Archives of Acoustics