Measuring and testing – Inspecting
Patent
1986-12-18
1988-05-31
Noland, Tom
Measuring and testing
Inspecting
738665, 324220, 33544, 33304, 33310, 33313, G01C 906
Patent
active
047473177
ABSTRACT:
A pipeline survey pig including an onboard inertial reference unit and signal processing units for receiving acceleration and angular velocity signals generated by the inertial reference unit, calculating resultant values of angular velocity and accelerations and averaging the calculated values to provide recordable signals related to the position of the pig and changes in curvature of the pipe. The pig is supported by a plurality of resilient cup shaped support members which have a stiffness characteristic whereby the natural frequency of vibration which may cause lateral excursions of the pig is less than the signal generating rate yet greater than the frequency of the signal to be measured. The center of stiffness and the center of gravity of the pig are disposed along the central axis of the pig and the pipeline section being measured and are preferably coincident with each other. The inertial reference unit includes three accelerometers and three gyroscopes oriented orthogonally and may have their axes oriented to intersect at the center of gravity and center of stiffness.
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Atlantic Richfield Company
Martin Michael E.
Noland Tom
LandOfFree
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