中文摘要：

为获取结构真实而精确的实模态振型，提出将复振型向量构建的特征方程应用于基于参考点的数据驱动子空间方法中进行结构模态参数识别的方法．为验证该方法识别结构模态参数的可行性和精确性，对一矩形截面悬臂梁端部突加一集中荷载，进行有限元时程分析，得到梁上一系列节点的加速度响应数据，进而利用提出方法识别了悬臂梁的频率、实模态振型及阻尼比．识别结果与悬臂梁模态参数的理论值吻合较好，表明利用复振型向量构建的特征方程结合基于参考点的数据驱动子空间方法进行结构模态参数识别是可行和精确的，该方法可以得到结构可靠的实模态振型．

英文摘要：

To obtain the true and accurate real vibration mode shapes of a structure, an improved method was proposed. The characteristic equation buih by complex mode shapes in vector form was used to couple with the data-driven stochastic subspace method based on identify structural modal parameters. To verify the feasibility and accuracy reference points to of this method, a cantilever beam with rectangular cross-section was considered by applying a sudden point load at the end of it, and then it was solved by dynamic finite element technique to obtain series of nodes acceleration response data. Next, the parameters as natural frequencies, real mode agreement of the identified results with the method is feasible and accurate to determine method was used to identify such modal shapes and damping ratios of the beam. The good theoretical solutions indicates that the proposed the real structural modal parameters.