An acoustic model of infinite element coupling with finite element is established in this paper.By applying the infinite element coupling with finite element of SYSNOISE,we study the outside sound field of radiation of the one-eighth closed spherical shell when the medium is water and air.Shell is one of the most widely used structures in engineering. Meanwhile the sound field problem of shell is being paid more and more attention. Strong sound field may cause the distortion,even destroys the structures, and makes the structures lose working ability.By calculating the outside sound field radiation of one -eighth spherical shell in a typical excitation, we obtain the basic distribution of outside sound level under lOOHz and sound pressure level curve of the field point when the fluid is water and air respectively.ln addition the basic changing rule of the outside sound field of shell with the change of excitation is obtained,which will provide important reference for further research on acoustic radiation and theoretical foundation for solving the engineering problems in the future.%建立了无限元与有限元声学耦合模型,运用SYSNOISE软件的无限元与有限元耦合技术对八分之一封闭球壳的外部辐射声场进行研究,计算了八分之一球壳在介质为水和空气时,在典型激励作用下的外部声场辐射情况.壳体是工程中应用最广泛的结构之一,同时壳体的声场问题也越来越受到关注,强声场可能会导致结构发生变形,甚至破坏,使结构失去工作能力.通过计算,得出了壳体在100Hz时的声压级分布图,给出了壳体外部为水和空气时的声压级曲线,得出了壳体外部声场随激励变化的基本规律.这种方法为研究声场辐射问题提供了重要参考,也为今后解决此类工程问题提供了理论上的依据.
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