| 摘要 |
PURPOSE:To compensate electrically for unbalanced measured value to zero for a short time by negatively feeding back a DC voltage which increases or decreases gradually due to the polarity of unbalanced vector obtained from a vibration detecting signal. CONSTITUTION:An object W to be tested is rotated, vibrations of bearings 1L and 1R are detected with pickups 2L and 2R and then, they are translated into unbalanced vectors on a surface to correct unbalanced vectors on right and left measuring surfaces with an arithmetic circuit 3. An unbalance signal is divided into an X component and a Y component with synchronous rectifiers 5 and 6 and smoothed. These signals are discriminated in the polarity with comparators 9 and 10 and a DC voltage which will be increased or decreased gradually with a DC voltage generator 11 is generated. This DC voltage is converted into AC through memories 15 and 16 and switches S9 and S10 controlled synchronously and negatively fed back to the pickups 2L and 2R. Thus, a compensating voltage can be obtained for a short time. |
