水重力式马铃薯静摩擦因数测定仪设计与试验

针对传统斜面法测定马铃薯静摩擦因数存在工作效率、精度较低等问题，提出水重力式马铃薯静摩擦因数测定原理，通过精确控制水的重力来确定马铃薯的静摩擦力，进而计算静摩擦因数，据此设计了马铃薯静摩擦因数测定仪。对甘肃省普遍种植的陇薯10号品种进行静摩擦因数测定。结果表明：带土马铃薯与钢板之间的静摩擦因数为0.420,与塑料板之间的静摩擦因数为0.496,马铃薯之间静摩擦因数为0.442;不带土马铃薯与钢板之间的静摩擦因数为0.455,与塑料板之间的静摩擦因数为0.526,马铃薯之间的静摩擦因数为0.483。由此可见，带土马铃薯的静摩擦因数较不带土马铃薯小，静摩擦因数从大到小依次为：马铃薯与塑料板之间、马铃薯之间、马铃薯与45号钢板之间。为进一步验证重力法的可靠性，进行马铃薯坍塌堆积角仿真和试验。结果发现：重力法条件下不带土马铃薯形成的堆积角与试验结果较接近，其相对误差为1.04%,斜面法条件下不带土马铃薯形成的堆积角与试验结果相对误差为7.73%;斜面法条件下带土马铃薯形成的堆积角与试验结果较接近，其相对误差为0.37%,重力法条件下的堆积角与试验结果的相对误差为4.31%。重力法可以测定马铃薯...

Design and Test of Water Gravity-based Potato Static Friction Coefficient Determination Device

For the traditional slant method in the determination of potato static friction coefficient, there are problems of efficiency and low precision, based on the principle of water gravity potato static friction coefficient determination, by accurately controlling the weight of water to determine the static friction of potato, and then calculate the static friction coefficient, according to which the potato static friction coefficient determination instrument was developed. The static friction coefficient of Long potato 10 varieties commonly grown in Gansu was determined. The results showed that the static friction coefficient between Long potato 10 and steel plate with soil was 0.420, the static friction coefficient between it and plastic plate was 0.496, the static friction coefficient between Long potato 10 was 0.442;without soil, the static friction coefficient between Long potato 10 and steel plate was 0.455, the static friction coefficient between it and plastic plate was 0.526, the static friction coefficient between Long potato 10 was 0.483. This showed that the static friction coefficient of potato with soil was smaller than that of potato without soil, and the static friction coefficient from large to small was as follows: between potato and plastic plate, between potato, between potato and No.45 steel plate. In order to further verify the reliability of the gravity method, the potato collapse stacking angle simulation and test for Long potato 10 were done. It was found that the pile-up angle formed by potato without soil under the condition of gravity method was close to the test results, and its relative error was 1.04%, relative error with the test results of the pile-up angle formed by potato without soil under the condition of slant method was 7.73%;the pile-up angle formed by potato with soil under the condition of slant method was close to the test results, and the relative error was 0.37%, and the relative error of pile-up angle under the condition of gravity method was 4.31%. In addition, the gravity method can determine the static friction coefficient between potatoes. The gravity method was superior to the slope method in determining the static friction coefficient of potatoes.