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旋转机械振动信号整周期采样时 ,计算采样脉冲输出频率的方法一般是把这一转的转速作为下一转的转速来计算 ,这样 ,当机组转子为匀变速或变速运动时整周期采样脉冲输出频率误差较大 .为了减少或补偿这种误差 ,提出了一种利用转速预估的方法 ,即用上一转和这一转的转速 ,通过拉格朗日线性插值 ,来估计下一转的转速 ,再以估计的转速计算采样脉冲输出频率 .给出了转速预估公式 ,通过一阶泰勒展开 ,推导出了适合单片机计算的近似预估公式 ,经实际使用效果较好
Rotating machinery vibration signal sampling period, the sampling pulse output frequency calculation method is generally the speed of this turn as the next rotation speed to calculate, so that when the unit rotor is variable speed or variable speed movement of the whole period of the sampling pulse output Frequency error is larger.In order to reduce or compensate this error, a method of using rotational speed estimation is proposed, that is, using the previous rotation and the rotation speed, through Lagrange linear interpolation to estimate the next turn Speed, and then calculate the output speed of the sampling pulse with the estimated speed.The rotational speed estimation formula is given, and the approximate estimation formula suitable for the single chip microcomputer calculation is deduced by the first-order Taylor expansion. The practical estimation result is good