CAJ | 학술논문

为了高精度地对扭振信号进行测试和处理，针对脉冲计数式扭振信号时频转换中的误差原因，提出了对扭振信号进行等时间间隔二次采样和对扭角计算公式进行修正2种方法来提高扭振信号时频转换精度。通过在整周期和非整周期标准扭振信号的时频转换中进行对比，证明2种方法对提高扭振信号时频转换精度均是有效的，而且利用修正的扭角计算公式所得的扭角信号为等时间采样信号，免去二次采样的过程，既能够保证时频转换的精度要求，又不会影响计算速度。此外，通过研究发现平顶窗对减小扭振信号截断所带来的泄露误差效果最好，增多齿盘的齿数或使用高精度的编码器会提高扭角时频转换的精度。
위료고정도지대뉴진신호진행측시화처리，침대맥충계수식뉴진신호시빈전환중적오차원인，제출료대뉴진신호진행등시간간격이차채양화대뉴각계산공식진행수정2충방법래제고뉴진신호시빈전환정도。통과재정주기화비정주기표준뉴진신호적시빈전환중진행대비，증명2충방법대제고뉴진신호시빈전환정도균시유효적，이차이용수정적뉴각계산공식소득적뉴각신호위등시간채양신호，면거이차채양적과정，기능구보증시빈전환적정도요구，우불회영향계산속도。차외，통과연구발현평정창대감소뉴진신호절단소대래적설로오차효과최호，증다치반적치수혹사용고정도적편마기회제고뉴각시빈전환적정도。
In order to measure and process torsional vibration signals with high precision, aiming at the sources of error in time-frequency domain transformation ( TFDT) of torsional vibration signals with pulse counting method, two methods for improving the accuracy of TFDT were proposed, including resample with constant interval and mod-ifying formulation of torsional angle. The methods were applied to TFDT of complete cycle and non-complete cycle standard torsional vibration signals, and it is found that the methods developed in this study are effective. The tor-sional angles with constant interval sampling can be obtained directly by the modified formulation to avoid resam-pling, which not only can guarantee the accuracy, but also have no negative effect on computing speed of TFDT. In addition, it is found that the effect of flat-top window on reducing the leakage errors due to blocking of torsional vi-bration signal is the best and the accuracy of TFDT could be improved by increasing the teeth number or using en-coder with higher precision.