Analysis of the Fluctuation of the Flowing Out Quantity of Granules from the Hopper
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概要
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The fluctuation of the flowing-out quantity of granules from the flat-bottomed hopper was investigated. Results are as follows;(i) The model hopper are made to continuing its vibration by the momentum change caused by the flowout of granules, because the hopper used is supported by two canti-levers (whose other ends are fixed) at its side walls.(ii) For the measured signals (that seems to be a kind of random waves), mainly, statistical analysis was performed for the discrete time series which are sliced from the alove random waves, and was drawn out the so-called 'hidden-periodicity' through the calculation of 'autocorrelation coefficient', 'power-spectral density' and 'energy spectrum distribution'.(iii) The dominant periodical components or frequencies, thus obtained, vary with the width of the outlet at the underside of our model hopper. (First, the main frequency component increases slowly, then rapidly increasing as the width of the slit becomes larger.)(iv) These results (tendencies) are thought to correspond to the tendency exsisting between the slit width and the frequency of the arching action of granules occuring at the vicinity of the outlet of the hopper.
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