農業機械学会誌
Online ISSN : 1884-6025
Print ISSN : 0285-2543
ISSN-L : 0285-2543
動力耕耘機における土壌の変位について (第5報)
供試片の信頼性について
川嶋 通義小森 盛
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ジャーナル フリー

1963 年 25 巻 1 号 p. 31-34

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On the measurment of soil displacement, it is necessary to clear the characteristic of displacement of soil displacement measuring pieces, and its characteristic can be shown by the trusting ratio of them. The trusting ratio of soil displacement measuring pieces changes by the material, size and specific-gravity of them, but we summarized as follows:
(1) The authors have introduced the following equation to indicate the trusting ratio of soil displacement measuring pieces.
The trusting ratio (%)=100-β×average deviation
where, β is a coefficient that is determined by the number of divided stratums and the minimum value of scattering soil to divided stratums.
(2) The trusting ratio of chalk-pieces are as follows:
length trusting ratio
0.75cm 97.74%
1.5cm 98.17%
3.0cm 89.74%
(3) There is some relation between the trusting ratio and the number of soil displacement measuring pieces. When the number of them increases, the trusting ratio approximates to characterestic value of them.
(4) On the measurment, more than a hundred soil displacement measuring pieces is necessary.

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