Abstract: A method and apparatus is disclosed that enables the periodic calculation of the relative phase of the left eigenvector for a vibrating conduit. During normal operation, two drivers are used in tandem to excite the main bending mode of the conduit (202). Periodically, first one (204), then the second (206), of the two drivers is disabled, allowing measurements that enable the determination of the relative phase of the left eigenvector (208) for the vibrating conduit.

Abstract: A method for validating a flow calibration factor of a flow meter is provided according to an embodiment of the invention. The method for validating a flow calibration factor of a flow meter comprises determining an initial flexural stiffness of a component of the flow meter. The method for validating a flow calibration factor of a flow meter includes determining a current flexural stiffness of the component. The method for validating a flow calibration factor of a flow meter further includes comparing the initial flexural stiffness to the current flexural stiffness. The method for validating a flow calibration factor of a flow meter further includes detecting a calibration error condition responsive to comparing the initial flexural stiffness to the current flexural stiffness.

Abstract: An apparatus for supporting a read/write head at a selected one of a plurality of substantially circular, concrete data tracks and for absorbing the rebound shock of a rotary actuator, the apparatus including a head actuator assembly having at least one read/write head mounted thereon, an actuator housing, and a stationary coil coupled to the head actuator. At least one permanent magnet is fixedly mounted relative to the head actuator. Upper and lower magnetic plates support the permanent magnet and each has at least two cavities which are substantially aligned with, but displaced off-axis from, the cavities of the other plate. At least two crash stops are provided, one to limit pivoting movement of the head actuator at the inner diameter of the hard disk and the other to limit movement of the head actuator at the outer disk diameter.