摘要
为了研究加环肋轴对称壳的声振特性，建立了计算两端带半球帽圆柱壳水中声辐射的有限元与边界元三维模型，分析了加肋高度、宽度、数量对轴对称壳表面平均振动速度、辐射功率、辐射效率、激励点法向声强、声场指向性的影响．应用有限元软件Ansys建模及模态分析方法，将数据导入边界元软件Sysnoise中计算，从而分析结构耦合状态下的辐射声场特性．结果表明，随着环肋高度、宽度及数量的增大，激励点法向声强、表面平均振动速度以及辐射效率和辐射声功率随频率变化曲线的峰彼此错开；环肋高度、宽度、数量增大时激励点法向声强以及辐射声功率均有增加，表面平均振动速度减小，因而导致声辐射效率增加；在0～800Hz频率范围内，环肋高度和宽度变化对声场指向性影响差别较小.
In order to investigate the characteristics of the vibration and sound field radiated by a cylindrical stiffened shell with two spherical end caps, a 3D model of finite element-boundary element method for computing the sound field radiated by an axisymmetric shell with stiffening rings in water has been established, and the effects of the height, the width and the number of the ring stiffeners on the RMS （root mean square） vibratory velocity, sound radiated power, radiation efficiency, normal sound intensity at driving point and pressure directivity of sound field radiated by it have been investigated. The data of the model in vacuum obtained from finite element methods code Ansys are put into boundary element methods code Sysnoise and used for computing~ the parameters of the coupled sound field. The results show that the curve peaks of the RMS vibratory velocity, radiated sound power, radiation efficiency, normal sound intensity at driving point will shift to different places when the width , or the height or the number of the stiffening rings increases. With the increase of the width , or the height or the number of the stiffening rings, the normal sound intensity at driving point and sound radiated power increase, the RMS vibratory velocity decreases , and the radiation efficiency increases. In the frequency region 0-800 Hz ,the influence of the width and the height of the rings on the sound field directivity pattern are nearly same.
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第1期49-53,共5页
Journal of Shaanxi Normal University：Natural Science Edition
基金
中国博士后科学基金资助项目(2005037792)
长安大学基础科学研究基金资助项目(2005J01)
关键词
环肋
轴对称壳
声振特性
stiffening ring
axisymmetric shell
characteristics of vibration and sound field
