Measuring Method of Timing Time from Blade Apex of Axial Ventilator

In order to have the non-contact measurement of the blade vibration on the axial ventilator and to improve the operation safety coefficient of the ventilato r, the paper had a study on the acquisition method of the timing time from the blade apex, one of the key technologies in the non-contact measurement. Based on the an alysis on the available methods, in combination with the condition of the axial ventilator, the paper provided the suitable measuring method of the timing time from the bl ade apex of the axial ventilator.With the statement of the measuring principle and related algorithm of the method, the signal source, oscilloscope, acquisition card and equipment design and test was applied to the study on the feasibility and accuracy of the method.When the frequencies occurred from the A1 and A2 apex timing senso rs were 367.36, 367.22 and 367.09 Hz individually, the duty ratio individually with 3.732%, 3.832% and 3.932% signal was collected.The analysis showed that the relate d error of No.4 sampling point with the A1 sensor was max and was 0.94%.The related error of No.8 sampling point with A2 sensor was max and was 0.57%.The related error not over 1% in average could showed the accuracy of the measuring method.