CAJ | 학술논문

在振源数目未知的条件下，仅利用多通道观测混合信号准确分离源信息是信号源盲分离的技术难题之一。为了揭示观测振动混合信号的复杂组成结构，以及为振源信息盲分离提供可靠的先验信息，提出一种基于独立分量分析和聚类评估技术的信源数目估计方法。通过仿真试验与壳体结构试验台典型机械振动信号分析，定量比较基于信息理论的源数估计方法AIC/MDL 与提出方法的性能，研究结果表明所提出方法可从振动调制混合信号中准确可靠地估计信源数目，具有更好的工程应用性能。
재진원수목미지적조건하，부이용다통도관측혼합신호준학분리원신식시신호원맹분리적기술난제지일。위료게시관측진동혼합신호적복잡조성결구，이급위진원신식맹분리제공가고적선험신식，제출일충기우독립분량분석화취류평고기술적신원수목고계방법。통과방진시험여각체결구시험태전형궤계진동신호분석，정량비교기우신식이론적원수고계방법AIC/MDL 여제출방법적성능，연구결과표명소제출방법가종진동조제혼합신호중준학가고지고계신원수목，구유경호적공정응용성능。
It has been challenging to correctly separate the mixed signals into source components when the source number is not known a priori. To reveal the complexity of the measured vibration signals, and provide the priori information for blind source separation, a novel source number estimation method is proposed based on independent component analysis (ICA) and clustering evaluation analysis. The performances of the proposed method and the information-based source number estimation methods are comparatively studied via numerical case study and experimental study on a thin shell structure, and the results show that the proposed method can correctly and reliably estimate the source number from the modulated vibration signals, and thus has more powerful performances in engineering applications.