时域和频域子结构试验模态综合方法的统一性

讨论刊用子结构模态试验结果获取组合结构模态参数的试验模态综合技术。在子结构界面刚性连接的条件下，基于实模态理论导出了频响函数综合方法的模态坐标形式的综合方程。通过对不可测量的高阶漠态的频响函数展开式的近似分析，证明了时域试验模态综合方法和频域试验模态综合方法的内在统一性。分析表明：时域和频域试验模态综合过程的实现的关键问题是连接界面自由度的合理简化。

The Uniformity of Time-Domain and Frequency-Domain Experimental Component Mode Synthesis Techniques

This paper discusses the experimental Component mode synthesis techniques for obtainingthe combined structure's modal parameters using the modal testing rusults of the substructures. Under theconditions of rigid coupling of subslructural interfaces, the motion equations of FRFs syntheis techniquewith modal coordihate forms are derived based on real modal theory. Through the approximative analysisfor the expansion series of FRFs of high-order mode which are unable to be measured directly, the inher-ent uniformity between time-domaln and frequency-domain exberimental component mode synthesis tech-niques is proved. The analysis indicates that the critical problem for implementing the time-domaim or fre-quercy-domain experimental component mode systhesis processs is reqsonably simptifying the DOF of cou-pling interfaces.