Department of Agricultural and Biosystems Engineering, College of Agriculture and Food, Qassim University, P.O. Box 6622, Buraydah, Al-Qassim 51452, Saudi Arabia.
Department of Agricultural Engineering, Faculty of Agriculture, Cairo University, Giza, Egypt.
Sci Rep. 2024 Oct 26;14(1):25585. doi: 10.1038/s41598-024-77571-8.
A mathematical analysis was conducted to predict the power requirements of the olive trunk shaker. The predicted required power of the olive trunk shaker is influenced by shaking displacement, fruit detachment force, fruit mass, stem length, damping ratio, unbalanced mass of the tree shaker, and exciting shaking frequency. The Olive trunk shaker was tested in the field at five attachment heights, 400, 500, 600, 700, and 800 mm, and six levels of olive trunk diameter: 78, 84, 101, 143, 158, and 186 mm. The results indicated that the theoretical shaking power was 12.8 kW while the actual required shaking power ranged from 7.1 to 17.8 kW, with an average of 12.6 kW due to variations in tree trunk diameters and different attachment heights. Multiple regression using the least squares method was employed to establish a statistical relation between the theoretical equation and the actual required power as a function of the clamp attachment height and trunk diameter. The regression coefficient of the predicted equation was 93.6% for attachment height values between 400 and 800 mm and tree trunk diameter values between 78 and 186 mm, with a mean absolute error of the prediction model was 0.5009 kW.
进行了数学分析以预测橄榄树干振动器的功率需求。橄榄树干振动器的预测所需功率受振动位移、果实脱落力、果实质量、茎长、阻尼比、振动器的不平衡质量和激励振动频率的影响。在橄榄树干直径为 78、84、101、143、158 和 186 毫米的五个固定高度 400、500、600、700 和 800 毫米的条件下，在田间对橄榄树干振动器进行了测试。结果表明，理论振动功率为 12.8kW，而实际所需的振动功率范围为 7.1 至 17.8kW，平均为 12.6kW，这是由于树干直径的变化和不同的固定高度造成的。采用最小二乘法的多元回归方法，建立了理论方程与实际所需功率之间的统计关系，该功率是固定高度和树干直径的函数。对于 400 至 800 毫米的固定高度值和 78 至 186 毫米的树干直径值，预测方程的回归系数为 93.6%，预测模型的平均绝对误差为 0.5009kW。
