Measuring and testing – Simulating operating condition – Marine
Patent
1987-12-17
1989-06-13
Myracle, Jerry W.
Measuring and testing
Simulating operating condition
Marine
7386219, G01M 1302
Patent
active
048380776
ABSTRACT:
An apparatus and method for monitoring the operation of a hollow drive shaft is disclosed. An instrument is inserted within the shaft. A first end of the instrument includes an elastomeric retainer having a relaxed outer diameter which is slightly smaller than the inner diameter of the shaft. The retainer is compressed to expand in into frictional engagement with the inner surface of the drive shaft to retain the instrument therein. A generator is mounted within the instrument for rotation therewith. The generator includes a relatively rotatable output shaft having a pendulum attached thereto. When the drive shaft is rotated, the instrument and the generator rotate therewith, but the output shaft and the pendulum do not. Consequently, an electrical output signal is generated which is representative of the rotational speed of the shaft. Several sensors are provided to generate electrical signals representative of the torsional stress within the shaft during use and the ambient temperature therein. The output signals are fed to a control circuit in the instrument. The control circuit includes a power supply sub-circuit for supplying electrical power to the various components thereof. The power supply sub-circuit includes batteries for maintaining the supply of electrical power when the drive shaft is not rotated during use and means for re-charging the batteries when the drive shaft is rotated. A power regulator sub-circuit regulates the electrical power supplied to most of the components of the control circuit. A wake-up sub-circuit generates a signal when the shaft is rotated. The control circuit is maintained in an active operating condition when the shaft is rotated and is automatically placed in a stand-by operating condition after a predetermined length of non-rotation.
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Johnson Herbert C.
Revenaugh Paul W.
Shifflet Glenn
Dana Corporation
Myracle Jerry W.
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