加肋圆柱壳制造误差对声学性能的影响研究

摘要

利用有限元软件ANSYS和边界元软件Sysnoise对加肋圆柱壳建造中可能产生的椭圆度、轴线倾斜、舱壁倾斜偏移的多种误差进行仿真计算,分析制造过程中产生的不同尺寸误差模型的系统声辐射特性.结果表明,声功率随着几何偏差尺寸增大而增大,但在所确定的加工工艺允许的要求范围内,这些偏差对声辐射影响很小,其中椭圆度对结构声学性能的影响较其他两种结构误差稍大.%By using of FEM software ANSYS and BEM software Sysnoise, simulation models for cylindrical pressure shell structure with different types of construction error were established, I. E. The ellipticity of shell section, the oblique of shell axes and the offset of bulkhead. And then we analyzed the characteristic parameters of the key construction technology which influenced the low noise construction technology of representative structure. The analysis results show that sound radiation power increases with the construction error increasing. However, the construction error can only imperceptibly influence the structure sound radiation power in the range of allowable error while the ellipticity of shell section is the most important factor in the three kinds of construction errors.