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## Optimization and experiment of spray cylinder swing frequency for spray seeding machine

Zhang Yun, Fan Chunmao, Chen Zhi, Wang Jianwei (College of Electromechanical Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)
The spray seeding machine use the principle of pneumatic conveying to make the seed sprayed through the spray cylinder. The spray cylinder is doing 0-180°circumference swing in a uniform linear motion complying with the machine. So, the trajectory of the seed fall on the ground is trochoid. In this way of seed spraying, some areas are sprayed with seeds repeatedly while other areas are missed completely. This phenomenon affects the seeding uniformity seriously. The repeated seeding area and missed seeding area are affected by the seeding width, the spray seeding machine operating moving speed and the swing frequency of spray cylinder. The swing frequency of spray cylinder is the main factor while the other two factors are restricted. So we take the smallest total area of repeated and missed as the objective function to optimize the spray cylinder swing frequency by MATLAB GUI. Thus, the program can read the parameters from the text box. First, the interpolation method was use to draw the seeding range map in a spray cylinder swing cycle. Then, the repeated and missed area were judged by comparing the seeding boundary. Third, the repeated and missed and total area were calculated using the numerical integration methods and save them in a matrix, each corresponds to the different swing frequencies. Finally, the minimum of total area and the corresponding swing frequency were found from the matrix. The results showed that the optimal swing frequency was 9.5 min -1 when the practical moving speed was 3 m/s, the optimal swing frequency was 5.6 min -1 when the test moving speed was 1.8 m/s , the spray outside radius was 20 m and the inside radius was 9 m. We carried out the test to verify the correctness of the program. The test speed was 1.8 m/s, the test spray cylinder swing frequencies were 4.5, 5.0, 5.6, 6.0 and 6.5 min -1 . The working spray seeding machine goes through the gridded test site by constant speed in a straight line. The seeding amounts of each grid were recorded. Then the repeated and missed areas were counted to compare with program results. The result show that the program is consistent, which proved the program is correct and reliable. The study can provide a theoretical basis for spray seeding machine design.
【Fund】： 国家自然科学基金项目“灌草带状配置修复退化草地工程尺度及其抗风蚀机理研究”(41161045);; 内蒙古自治区应用技术研究与开发资金计划项目“基于灌草带状配置的退化草地工程修复技术研究与示范”(20110518)
【CateGory Index】： S223.22
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