%0 Journal Article
%T NORMAL-MODE SOUND FIELD OF DIRECTIONAL RADIATOR<br>指向性辐射器的简正波声场
%A Zhang Ren-he
%A Zhu Bai-xian
%A <br>张仁和
%A 朱柏贤
%J 物理学报
%D 1983
%I 
%X In this paper, the sound field of a more general directional radiator in a stratified medium is treated, and the concept of directivity is applied to calculation of the normal modes. The result shows that the normal-mode field of a directional radiator can be obtained by supplementing the normal-mode expression of a omnidirectional point source with the directivity-excitation-function, which is dependent on the position and directivity of the radiator. In addition, the normal-mode fields of the radiators with vertical-symmetrical, vertical-antisymmetrical, single-side and sharp directivity are calculated, respectively.For the vertical line array in a homogeneous water-layer, if the source distribution is proportional to the eigenfunction of some normal mode, the zeros of the directivity-excitation-function are just corresponding to the directions of eigen-rays of other normal modes.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=AD61E5A3DB8F72955CE71C4F3182E9E1&yid=A7F20A391020FDEE&vid=9971A5E270697F23&iid=E158A972A605785F&sid=D397660E39E3E461&eid=C4490A71BEB872FA&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=0