Ube Industries, Inc.

Ishikawajima-Harima Heavy Industries Co., Ltd.

Yoshiya Nakamura

Mitsuhiko Sato

Tsutomu Oishi

Yoshizumi Tanaka

The porous sound-absorbing material manufactured is light and has excellent heat resistance to be applicable to the exhaust nozzle etc. of a jet engine, can effectively absorb noise as that from a jet engine, over a wide range of frequencies, is free from variations in porosity, and provides stable performance characteristics. An essential feature thereof is the formation of a skeleton of the material, with aggregates containing voids. Thus, a porous sound-absorbing material having a skeleton of aggregates with first voids is described, wherein diameters of first voids of the aggregates are 50 &#x3bc;m to 100 &#x3bc;m, approximately, and diameters of second voids between the aggregates are 100 &#x3bc;m to 600 &#x3bc;m.

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Tokyo, Japan

Yoshiya Nakamura