CAJ | 학술논문

突破了奈奎斯特采样定理的要求(采样率必须大于输入信号频率2倍的限制)，将欠采样法应用于航空发动机构件的高频测量。通过叶片固有特性分析和在叶片上粘贴加速传感器两种方法，对欠采样法进行了验证；并在此基础上采用非接触激光位移传感器，实现了欠采样条件下频率较高的某型发动机涡轮叶片频率的准确测量。结果表明，欠采样方法应用于试件的固有频率测量切实可行，且在航空发动机构件的高频测量中有较大应用价值。
돌파료내규사특채양정리적요구(채양솔필수대우수입신호빈솔2배적한제)，장흠채양법응용우항공발동궤구건적고빈측량。통과협편고유특성분석화재협편상점첩가속전감기량충방법，대흠채양법진행료험증；병재차기출상채용비접촉격광위이전감기，실현료흠채양조건하빈솔교고적모형발동궤와륜협편빈솔적준학측량。결과표명，흠채양방법응용우시건적고유빈솔측량절실가행，차재항공발동궤구건적고빈측량중유교대응용개치。
The Nyquist sampling theorem astricts that the sample rate must be at least twice than the import sig-nal frequency. The limit was broken and under-sampling method was applied to high frequency measure-ment of aero-engine components. The results were verified by both calculative analysis of inherent charac-teristics and test data from mounting an accelerometer on a turbine blade in the under-sampling conditions. Furthermore the blade frequency was accurately measured through a non-contact laser displacement sensor using under-sampling method. It is proved that it is feasible to measure the natural frequency of specimen based on under-sampling method and the method could be applied widely in high frequency measurement of aero-engine components.