亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

In view of the problem that the resistance of the coreshare furrow opener is too large under high speed operation, an optimal design method of furrow opener based on the bionics principle was proposed based on the efficient and low resistance penetration structure of the dogbadger canine tooth surface. China northeast farmed badger was selected as bionic biological samples, it was carried out on the upper right canine of badger advance disinfection after treatment for 3D scanning and obtained the complete point cloud data, and then through the Matlab software, fitting curve of the four best badger canine based on the above four design was obtained and the four kinds of slide furrowing device were processed, finally it was compared with the traditional coreshare furrow opener through contrast test analysis. Under the condition that the operating depth was 50mm, the type of opening device and operating speed were taken as the test factors, the horizontal operating resistance was taken as the main index, and the trench depth, trench width, ridge height and ridge width of the trench device were taken as the secondary index to conduct the soil groove test. The experimental results showed that the resistance of each optimized sliding trench opener was lower than that of the standard coreshare furrow opener at the same operating speed. At operating speed of 3.6km/h, 5.4km/h and 7.2km/h, the operating resistance of the optimal sliding trench device can be reduced by up to 8.04%, 8.15% and 8.71%, respectively, compared with the standard coreshare furrow opener. The variation coefficient of furrow depth, furrow width, side ridge height and side ridge width by standard coreshare furrow openers and optimized sliding furrow openers were all lower than 5%.