騒音評価量L_xの逐次観測に基づく遮音システム・パラメータの一同定法

概要

論文の詳細を見る
It is well-known that the experimental results for transmission loss of a single wall usually show greater values than those based on only the mass law in the low frequency region. In order to explain this phenomenon, A. London introduced the resistive factor of the wall impedance in addition to the mass law. However, the value of this resistive factor R was established adaptively from the observed experimental data and was not systematically calculated from the standpoint of the internal energy dissipation mechanism of wall materials. This paper proposes a trial of systematic method for estimating the resistive factor R of the single wall based on the sequential observation of noise evaluation level L_x. The stochastic approximation method is used in order to overcome the difficulties based on both the non-Gaussian property of random fluctuation wave form and the non-linearity being latent in the environmental noise phenomena. This estimation method is applied to observed data obtained by means of the reverberation room method. The estimated results are in good agreement with the experimental results obtained by other investigators and those by authors.
社団法人日本音響学会の論文
1980-09-01