CAJ | 학술논문

　　运行模态识别是一种仅仅根据环境激励下的结构振动响应来提取结构模态参数的方法，此方法一般基于环境激励为白噪声的假设。文章讨论了NExT/ERA方法在船体结构总体模态识别中的可行性，并采用了自然激励技术与特征系统实现算法相结合的方法，识别了船体模型的总体模态参数。文中还讨论了NExT/ERA方法的基本理论及计算流程，并引入了奇异值分解图和稳定图相结合的方法更好地确定系统的阶次；最后，用NExT/ERA算法有效地识别了简支梁模型和船体模型的模态参数。
　　운행모태식별시일충부부근거배경격려하적결구진동향응래제취결구모태삼수적방법，차방법일반기우배경격려위백조성적가설。문장토론료NExT/ERA방법재선체결구총체모태식별중적가행성，병채용료자연격려기술여특정계통실현산법상결합적방법，식별료선체모형적총체모태삼수。문중환토론료NExT/ERA방법적기본이론급계산류정，병인입료기이치분해도화은정도상결합적방법경호지학정계통적계차；최후，용NExT/ERA산법유효지식별료간지량모형화선체모형적모태삼수。
Operational modal analysis methods are procedures that abstract modal parameters of structures only from response, these procedures are always based on the assumption that the excitations are white noise. In this paper, the feasibility of NExT/ERA in identifying modal parameters of ship structures is discussed, and the modal parameters of a general ship model are identified using NExT/ERA. The basic theory of NExT and ERA are discussed; a method of identifying system order that combines the singular values decom-position and stabilization diagram is introduced to identify system order better; Finally, with NExT and ERA method, the modal parameters of a simply supported beam and a ship model are identified efficiently.