| 摘要 |
Movement of a structure, such a conduit of a Coriolis mass flowmeter, is estimated. A plurality of motion signals representing motion of the structure are mode selective filtered to generate a plurality of mode selective filtered motion signals such that the mode selective filtered motion signals preferentially represent motion associated with a vibrational mode of the structure. A plurality of phase estimates is generated from the plurality of mode selective filtered motion signals. The plurality of phase estimates may be generated using a phase reference derived from a mode selective filtered motion signal of the plurality of mode selective filtered motion signals. According to some embodiments, a frequency of a mode selective filtered motion signal is estimated, and quadrature first and second reference signals are generated based on the estimated frequency. The plurality of phase estimates is generated from the plurality of mode selective filtered motion signals and the first and second reference signals. According to other embodiments, a plurality of time difference estimates is generated from the plurality of phase estimates. According to still other embodiments, an intercept parameter of a scaling function that relates the plurality of time difference estimates to a plurality of reference time differences representing motion of the structure under a known perturbation is estimated, and a system status is determined from the intercept parameter. The invention may be embodied as methods, apparatus and computer program products.
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