A study on elastic and frictional effects for the mass law of sound insulation system by means of equivalent electric circuit (theory and experiment)

摘要

As a new trial on a single-wall sound insulation system, its transmission loss is derived by introducing an equivalent electrical circuit for a specific acoustic impedance of a flat plate based on the electric & mechano-sound transformation. An output response probability distribution of a plate under (Gaussian fluctuation 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.