Sound Insulation of Sandwich Panels with Additional Claddings

The results of theoretical and experimental studies of sound insulation of sandwich panels are presented. Samples of sandwich panels with gluing cladding and the middle layer and a sandwich panel with acoustic separation of the cladding and the middle layer were studied. Theoretical studies were carried out on the basis of the theory of self-coordination of wave fields, taking into account the resonant and inertial components of sound transmission. The reserves for improving the sound insulation of sandwich panels are determined, as the difference between their own sound insulation and the maximum sound insulation of the fence. The maximum sound insulation of the fence corresponds to the inertial sound transmission, while there is no resonant component. Based on the results of theoretical studies conducted, methods for improving the sound insulation of sandwich panels, which are presented in the form of a diagram, are determined. This article considers one of the ways to increase the sound insulation of sandwich panels by attaching additional claddings from sheet materials. Frequency characteristics of the coefficients of resonant and inertial sound transmission through the sandwich panels under study are presented. The results of experimental measurements confirm the theoretical conclusions about the effectiveness of the use of additional claddings to increase the sound insulation of sandwich panels in the normalized frequency range. Improving of sound insulation of sandwich panels is achieved by reducing of resonance and inertial sound transmission through the sandwich panels when the resonant frequency of the “mass-elasticity-mass” system is shifted to a lower frequency range.

V.N. BOBYLEV¹, Corresponding Member of Russian Academy of Architecture and Construction Sciences, Candidate of Sciences (Engineering),
P.A. GREBNEV¹, Candidate of Sciences (Engineering);
V.I. EROFEEV², Doctor of Sciences (Physics and Mathematics);
D.V. MONICH¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
L.A. TIKHOMIROV³, Researcher;
D.S. KUZMIN¹, engineer

¹ Nizhny Novgorod State University of Architecture and Civil Engineering (65, Ilyinskaya street, Nizhny Novgorod, 603950, Russian Federation)
² Mechanical Engineering Research Institute of the Russian Academy of Sciences – branch of Federal Кesearch Сenter, Institute of Applied Physics of the Russian Academy of Sciences (85, Belinskogo Street, Nizhny Novgorod, 603024, Russian Federation)
³ Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)

1. Kurtze G. Bending wave propagation in multilayer plates. Journal of the Acoustical Society of America. 1959. Vol. 31, No. 9, pp. 1183–1201.
2. Dym C.L., Lang M.A. Transmission of sound through sandwich panels. Journal of Acoustical Society of America. 1974. Vol. 56, No. 5, pp. 1525–1532.
3. Moore J.A., Lyon R.H. Sound transmission loss characteristics of sandwich panel constructions. Journal of Acoustical Society of America. 1991. Vol. 89, pp. 777–791.
4. Bolton J.S., Shlau N.M., Kang Y.J. Sound transmission through multi-panel structures lined with elastic porous material. Journal of Sound and Vibration. 1996. Vol. 191, 3, pp. 317–347.
5. Lang M. A., Dym C. L. Optimal acoustic design of sandwich panels. Part 2. Journal of the Acoustical Society of America. 1975. Vol. 57, No. 6, pp. 1481–1487.
6. Dijckmans A., Vermeir G. Optimization of the acoustic performances of lightweight sandwich roof elements. Proceedings of «INTER-NOISE-2009», Ottawa, Canada. 2009, pp. 23–26.
7. Заборов В.И., Клячко Л.Н., Новиков И.И. О звукоизоляции трехслойными конструкциями // Акустический журнал. 1984. Т. ХХХ. Вып. 4. С. 482–485.
7. Zaborov V.I., Klyachko L.N., Novikov I.I. O zvukoizolyatsii trekhsloinymi kon-struktsiyami. Akusticheskii zhurnal. 1984. Vol. XXX, No. 4, pp. 482–485. (In Russian).
8. Thamburaj P., Sun J.Q., Optimization of Anisotropic Sandwich Beams for Higher Sound Transmission Loss. Journal of Sound and Vibration. 2001. Vol. 254, pp. 23–36.
9. Wawrzynowicz A., Krzaczek M., Tejchman J. Experiments and FE analyses on airbone sound properties of composite structural insulated panels. Archives of acoustics. 2014. Vol. 39, No. 3, pp. 351–364.
10. Hwang S., Kim J., Lee S., Kwun H. Prediction of sound reduction index of double sandwich panel. Applied Acoustics. 2015. Vol. 93, pp. 44–50.
11. Liu Y., Sebastian А. Effects of external and gap mean flows on sound transmission through a double-wall sandwich panel. Journal of Sound and Vibration. 2015. Vol. 344, pp. 399–415.
12. Liu Y., Catalan J.-C. External mean flow influence on sound transmission through finite clamped double-wall sandwich panels. Journal of Sound and Vibration. 2017. Vol. 405, pp. 269–286.
13. Liu Y., Catalan J.-C. Effects of external and air gap flows on sound transmission through finite clamped double-panel sandwich structures. Composite Structures. 2018. Vol. 203, pp. 286–299.
14. Седов М.С. Звукоизоляция. В кн.: Техническая акустика транспортных машин: Справочник / Под ред. Н.И. Иванова. СПб.: Политехника, 1992. С. 68–106.
14. Sedov M.S. Zvukoizolyatsiya. V kn.: Tekhnicheskaya akustika transportnykh mashin, spravochnik. Pod red. N.I. Ivanova [Sound insulation. In the book: Technical Acoustics of Transport Machines, Handbook, Edited by N.I. Ivanov]. Saint Petersburg: Politekhnika. 1992, pp. 68–106.
15. Sedov M.S. Effect of breaking free waves in thin plates of double construction: Proceedings of Fourth international congress on sound and vibration, edited by M.J. Crocker and N.I. Ivanov. Saint Petersburg. 1996, pp. 1073–1076.
16. Гребнев П.А. Звукоизоляция ограждающих конструкций зданий из сэндвич-панелей. Дис. … канд. техн. наук. Н. Новгород, 2016. 186 с.
16. Grebnev P.A. Sound insulation of building enclousers from sandwich panels. Cand. Diss. (Engineering). Nizhny Novgorod. 2016. 186 p. (In Russian).
17. Bobylyov V.N., Tishkov V.А., Monich D.V., Dymchenko V.V., Grebnev P.A. Experimental study of sound insulation in multilayer enclosing structures. Noise Control Engineering Journal. 2014. Vol. 62, 5, pp. 354–359.