In recenI years , structure − bone sound generated by water piping system influences on the rooms in hoIels and apartment houses etc , and a problem caused by the noise are increasing . So the experirnental investigations on 【 he sound and vibraIion reduction of smlcture − bone sound at water piping sysIems by two size ofexpansion chamber type mumers were caπ ied ouL The fbllowing conclusions were obIained . .
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