Abstract:The sound insulation of double panels with a certain plane dimensions and boundary condition can be analyzed by a combinative way of impedance analysis method and a few measurements,and an expert formula can be obtained.Three kinds of sandwich material constructions were analyzed respectively.Its sound insulations and expert formulae were obtained in octave band.These three kinds of sandwich materials are absorbing sandwich,air sandwich,and air-absorbing sandwich.It will be convenient and high efficient to screen insulation construction parameters by these expert formulae in engineering design.
