LOW-FREQUENCY SOUND ABSORBING MATERIAL AND TRANSFORMER SOUND-PROOFING SYSTEM EMPLOYING THE SAME

PROBLEM TO BE SOLVED: To improve sound absorbing characteristics of a low-frequency sound absorbing material in frequency bands of 100-200 Hz. SOLUTION: This low-frequency sound absorbing material 1 is provided with a coating film 2 consisting of a silicone-based resin having a thickness of about 50...

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Main Authors TAKAGI YOSHIO, HAYAKAWA TERUYOSHI, USUI SHIGENARI, UEKI YOSHIHARU, HIROKAWA MITSUHARU, KITAMURA YU
Format Patent
LanguageEnglish
Published 13.12.2007
Subjects
ACOUSTICS
ACOUSTICS NOT OTHERWISE PROVIDED FOR
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
MAGNETS
METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL
MUSICAL INSTRUMENTS
PHYSICS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
SOUND-PRODUCING DEVICES
TRANSFORMERS
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Summary:PROBLEM TO BE SOLVED: To improve sound absorbing characteristics of a low-frequency sound absorbing material in frequency bands of 100-200 Hz. SOLUTION: This low-frequency sound absorbing material 1 is provided with a coating film 2 consisting of a silicone-based resin having a thickness of about 50 μm and a surface density of 0.68-0.78 kg/m2or 1.75-1.85 kg/m2; and a porous layer 3 consisting of a glass wool (density: 32 kg/m3) laminated on the back surface side of the coating film 2. The low-frequency sound absorbing material 1 employing the coating film 2 of type F' or type S is placed on a floor 51 of a metallic (made of steel sheet) casing 5 for accommodating the transformer so that the porous layer 3 may face the floor 51. According to the transformer sound proofing system having this structure, noises of about 4.0 dB can be reduced. COPYRIGHT: (C)2008,JPO&INPIT
Bibliography:Application Number: JP20060153345