抄録
As a new trial on modification of the mass law for a single-wall sound insulation system, first, its electric circuit model is proposed to illustrate how the elasticity of material works on the sound insulation mechanism. An equivalent electrical circuit model for a specific acoustic impedance of a flat plate is constructed on the basic of mechano-electric transformation to reflect the elastic and frictional effects of material into the evaluation method of transmission loss. An output response probability distribution of a plate under Gaussian type sound pressure incidence is theoretically evaluated especially through eigenvalues of the system characteristic function given by frequency spectrum of input random noise, the frequency transfer character of the plate and the dynamics of a sound level meter. In the experiment , the proposed method is applied to the actual noise evaluation problems of a single-wall sound insulation system under a band limited white noise input, only as one of principle experiments.
