Linear Time-Invariant Compensation of Cup Anemometer and Vane Inertia |
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| Authors: | Tihomir S Hristov Scott D Miller Carl A Friehe |
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| Institution: | (1) Department of Mechanical and Aerospace Engineering, University of California, Irvine, California, 92697-3975, U.S.A. |
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| Abstract: | We propose a method to compensate for the phase lag and the amplitudeattenuation in the cup anemometer signal. These two effects, caused by theinstrument's inertia, are the major flaws of the cup anemometer in additionto over-speeding. Since the instrument's response is invariant in wavenumber (not frequency) representation, we transform the signals to becompensated from the time domain to the spatial domain by using Taylor'shypothesis. In the spatial domain we apply a linear time-invariant filterto eliminate the phase lag and the amplitude attenuation. The proposedprocedure improves instrument performance down to spatial scales equal toor smaller than the distance constant of the anemometer. The method for cupanemometer compensation is presented in detail and later adapted for vanes. |
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| Keywords: | Cup anemometer compensation Discrete-time signal filtering Inertial subrange Turbulence measurements Vane compensation |
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