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Title:
TORSIONAL OSCILLATION DETECTOR
Document Type and Number:
Japanese Patent JPS61182530
Kind Code:
A
Abstract:

PURPOSE: To grasp the magnitude of torsional oscillation quantitatively by simple signal processing by detecting a torsional angle between two points along the axial direction of a rotary shaft and deciding a torsional oscillation variable on the basis of an integration value obtained by integrating said detecting value for a prescribed period.

CONSTITUTION: When shafts 1, 2 are rotated, a photodetector 7 detects plural light rays by fine slits formed on a slite plate 5 during the period when one slit formed on a slit plate 4 passes the front of a light emitting source 6 at the rotation of the slit plate 4. The quantity of detected light is varied in accordance with a relative torsional angle due to torsional oscillation between points A and B. A pulse signal obtained by encoding a signal inputted to an A/D converter 8 into a binary signal is inputted to a pulse counter 9 and the counting value is subtracted from a reference value (n) by a subtracting circuit 10 to calculate a value Δn corresponding to the torsional angle between the points A and B. The value Δn is inputted to an integrating circuit 11 to calculate an integrating value within a prescribed time. The output of the circuit 11 is inputted to an oscillation level part 13 to display the level and the output of the level part 13 is inputted to a comparator 14 to compare the output with a reference value G, so that the level of the torsional oscillation is detected.


Inventors:
YOSHIDA OSAMU
Application Number:
JP1985000023021
Publication Date:
August 15, 1986
Filing Date:
February 08, 1985
Export Citation:
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Assignee:
ISHIKAWAJIMA HARIMA HEAVY IND
International Classes:
G01H1/10; (IPC1-7): G01H1/10



 
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