CAJ | 학술논문

针对发动机瞬时转速Hilbert频率解调法端点效应误差大、计算精度低的问题 ,提出了基于总体经验模态分解(Ensemble Empirical Mode Decomposition ,EEMD)和能量算子解调的瞬时转速计算方法.该方法利用EE-MD从原始多分量信号中提取包含瞬时转频的单分量信号 ,再利用能量算子解调法从所提单分量信号中解调出瞬时转频 ,进而求得瞬时转速 ,消除了 Hilbert变换的端点效应 ,提高了计算精度.通过试验信号仿真和实测信号的应用研究 ,证明了本方法的有效性和准确性.
침대발동궤순시전속Hilbert빈솔해조법단점효응오차대、계산정도저적문제 ,제출료기우총체경험모태분해(Ensemble Empirical Mode Decomposition ,EEMD)화능량산자해조적순시전속계산방법.해방법이용EE-MD종원시다분량신호중제취포함순시전빈적단분량신호 ,재이용능량산자해조법종소제단분량신호중해조출순시전빈 ,진이구득순시전속 ,소제료 Hilbert변환적단점효응 ,제고료계산정도.통과시험신호방진화실측신호적응용연구 ,증명료본방법적유효성화준학성.
In order to solve the problems that the Hilbert transform method of engine instantaneous speed has end effect and low precision ,a new method based on ensemble empirical mode decomposition (EEMD) and energy operator demodulation was proposed .The single component signal containing instantaneous rotation frequency was extracted from the original multi-com-ponent signal based with the EEMD method ,then the instantaneous rotation frequency was extracted from the single compo-nent signal by using energy operator demodulation and finally the instantaneous speed was acquired .Therefore ,the end effect of Hilbert transform was eliminated effectively and the calculation precision improved greatly .The application of simulated and measured signals verified the effectiveness and accuracy of the method .