一般二重壁の遮音特性に対する系統的一理論と吸音性中空二重壁への実際的適用

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It is a well known fact that the original method by A. London derived from the solution of a wave equation is widely used in predicting the transmission loss of a double wall, and further there are many modifications of London's method. But none of the above methods is able to make strictly accurate prediction of transmission loss of sound at random incidence. The content of this paper is characterized by the following three points : (1) Essentially, it is very important to consider not only the resistive factor of the wall impedance proposed by London but also the internal energy dissipation in the cavity, so that a new approach of accurate evaluation is proposed from the standpoint of an equivalent circuit of double wall. To be concrete, an internal dissipation factor in the cavity is reasonably reflected in several circuit constants of the equivalent circuit corresponding to the double wall structure. (2) This systematic theory of predicting the transmission loss of general double wall is given from a wide viewpoint of an equivalent distributed constant circuit of double wall, and is not given from the direct solution of the wave equation. It is noteworthy that the London's basic equation can be directly derived as a special case from our systematic theory. Furthermore, as the other special two cases, the well known Bruel's theory and the evaluation method by the concentrated constant circuit theory are also easily derived from our theory. Thus, the fairly universal applicability of our theory has been verified within the scope of theory. (3) In addition, this paper shows that our systematic method can be extended to the double walls using an absorbent material in the cavity, which is never theoretically investigated. Experimental results found in other laboratories and those of us agreed with our theory satisfactorily.
社団法人日本音響学会の論文
1978-01-01

一般二重壁の遮音特性に対する系統的一理論と吸音性中空二重壁への実際的適用

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