入力騒音と騒音計の内部メカニズムに直結した遮音システムの出力変動に関する確率評価手法

概要

論文の詳細を見る
In this paper, a new trial of stochastic evaluation problem on the output sound level fluctuation of a sound insulation system with Gaussian random wave excitation is proposed by considering the internal mechanism based on a frequency transfer character of insulation system and a mean-squaring operation of the sound level meter. The characteristic function for the response probability of the sound level meter is derived first by employing the Parseval's complete relation. More concretely, an explicit expression of the output level probability distribution is theoretically given in a general expansion form by applying a well-known residue theorem in the theory of function. Then, the output response probability function of the sound insulation system can be predicted by using the frequency spectrum of input random noise, the frequency transfer character of the noise insulation system and the measurement mechanism. Finally, the theoretically predicted results are compared with the experimentally observed results using a usual sound level meter for two kinds of single wall inserted between two reberveration rooms.