摘要
Just forty years ago,Zwikker and Kosten‘s classical work"Sound AbsorbingMaterials"was published and the theoretical foundation of sound absorbing materi-als was laid.And Mechel‘s monograph"Schallabsorber"is an important develop-ment.The book consists of three volumes.Volume one is outer sound field,thatis,interaction between sound field and sound absorber;volume two is internalsound field,or the structure and application of sound absorber;volume three iscomputer program,a supplementary volume.Volume one is now published.The
