对接圆柱壳结构模态特性分析

对接圆柱壳结构在航空航天、船舶、土木和机械等工程领域得到广泛应用，对其模态特性的分析是研究其动力学特性的重要方向.本文简要介绍了模态分析技术和最小二乘复频域法(PolyMAX)的基本原理，并对对接圆柱壳结构进行了计算模态分析和实验模态分析.实验模态分析过程中，针对自由边界的实验实现、分析结果的正确性进行了讨论，并将实验结果与计算模态分析结果进行对比，对比结果表明：对接圆柱壳结构具有圆柱壳结构一般振动特性的同时，由于对接形式的存在出现了以法兰面为分界的非对称振动.

MODAL ANALYSIS OF BUTTED CYLINDRICAL SHELL STRUCTURE

Butted cylindrical shell structure is widely used in aerospace, shipbuilding, civil engineering and mechanical engineering. Modal analysis is an important research direction to study its structural characteristics. This study briefly introduces the modal analysis technology and the basic principle of the polyreference least-squares complex frequency-domain method (PolyMAX), and the finite element modal analysis and experimental modal analysis of butted cylindrical shell structures are carried out. In the process of experimental modal analysis, the experimental realization of the free boundary and the correctness of the analysis results are discussed, and the analysis results are compared with the finite element modal analysis results. The results show that while the butted cylindrical shell structure has the general vibration characteristics of the cylindrical shell structure, the asymmetric vibration with the flange as the boundary occurs due to the existence of the docking form.