混合モデル型任意音響システムの非線形評価に関する確率理論とL_<eq>変動の分布評価

概要

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The additive model with external fluctuation factors and the multiplicative model with internal fluctuation factors are well-known as two fundamental models describing the stationary and non-stationary random phenomena in the actual engineering field. An actual stochastic systems described by an additive model in a short time interval must be very often described in a long time interval by a mixed type stochastic model containing the fluctuation of multiplicative factor, because the internal parameter of the system changes with the passage of time. In this paper, first, by introducing a mixed type stochastic model for the actual random process, a unified expression is proposed for the probability distribution function of the above non-stationary composite wave measured by an arbitrary non-linear observation system. Next, by use of the above theory, two types of new methods identifying the probability distribution function of a specific factor embedded in the composite wave are derived in a general form of series expansion expression. Finally, by applying the above theoretical results to various types of L_<eq> evaluation problems of road traffic noises and industry noises based on the actual noise observations corrupted by the background noise, the validity of proposed evaluation methods is also experimentally confirmed.
社団法人日本音響学会の論文
1985-04-01