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軟弱地에서 動力耕耘機 沈下量 推定을 위한 平板의 適正形象 및 크기에 관한 硏究
李揆昇,李鎔國,趙義健 成均館大學校 科學技術硏究所 1986 論文集 Vol.37 No.1
This study was conducted to determine the optimum shape and dimension of plate predicting the sink age of power tiller in soft paddy field. Various size of disc and rectangular plates were tried at five different soil moisture content, and the resules are summarized as follows. 1. Linear relationship is recognized between contact pressure and sinkage of plates using log-log paper at higher soil moisture content, but the plate sinkage is affected by hard pan in case of the lower moisture soil conditions. 2. Concerning the value of soil deformation coefficient K, the variation of measured values due to shape and size of plate can be practically negligible for the rectangular plates which have 2.5, 5 and 10cm width and with 2 or 3 aspect ratio, and the disc plate which has 20cm diameter. The variation of the exponent of sinkage n, can be practically negligible for the rectangular plates which have 5, 10 and 15cm width, and disc plates which have 20 and 30cm diameters. 3. Relationship between the sinkage of some type of plate and that of power tiller was linear. The closest relationship were found between the sinkage of power tiller and plates for 2.5 and 5cm width rectangular plates regardless of aspect ratio and for the disc plates having 10 and 20cm diameters. 4. Consequently, the optimum plate shape and size for predicting the sinkage of power tiller in soft paddy field are found as the rectangular plates which have 5 and 10cm width and 2 or 3 aspect ratio, and the disc plates having 10 and 20cm diameter.
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