一种非均匀环肋圆柱壳振动与声辐射性能研究

引入圆柱壳圆截面内运动假设，利用模态法推导非均匀环肋圆柱壳模态机械阻抗解析式；通过模态机械阻抗控制法，围绕激励力位置设置阻抗增强肋骨，构造一种非均匀环肋圆柱壳；采用FEM/BEM法对该非均匀环肋圆柱壳振动与声辐射性能进行研究，并通过模型振动试验与普通环肋圆柱壳进行对比分析。研究表明：通过增大环肋机械阻抗、合理地布置阻抗增强环肋位置构造的非均匀环肋圆柱壳，可有效降低结构振动响应和辐射噪声水平，具有较好的振声性能。

Vibration and Sound Radiation Characteristics of a Non-Uniformly Ring Stiffened Cylindrical Shell

In this paper, the radial modal mechanical impedance of ring stiffened cylindrical shells is de-rived with the modal analysis method and by introducing a virtual inner-motion of cylindrical shell＆#39;s sec-tion. The impedance-reinforced ring is then positioned with excitation force and a type of non-uniformly ring stiffened cylindrical shell is designed by control modal mechanical impedance. The vibration and sound radiation characteristics of the non-uniformly ring stiffened cylindrical shell are numerically calcu-lated by FEM/BEM method. Comparison between the acceleration of non-uniformly ring stiffened cylindri-cal and conventional ring stiffened cylindrical shells is conducted through model vibration tests. The re-sults show that non-uniformly ring stiffened cylindrical shells designed with improved mechanical imped-ance could refine the vibration response and reduce the line spectrum of radiation noise effectively. Over-all, the proposed shell has superior vibro-acoustic performance over other types of shells.