元线非直线型铧式犁几何与力学特性研究

降低铧式犁耕作阻力,减少能源消耗,是国内外农业机械研究者一直非常关注的课题。铧式犁犁体曲面成型方法是元线沿着准线按照一定规律运动形成,元线与准线形式是影响铧式犁耕作阻力的两个重要因素。以BTU3 5犁体为基础,用三角函数曲线代替直线作为元线形成新犁体曲面,采用有限元分析方法 ,将两犁体曲面耕作阻力进行比较。研究发现:三角曲线作为元线形成的犁体曲面耕作阻力较小,在5、6、7km/h时耕作阻力分别比原犁体降低2.5%、4.1%、3.9%。结合直线与sin函数曲线曲率变化情况,可得出结论:变曲率犁体曲面更有利于降低耕作阻力。

Study on Geometrical Properties and Working Resistance Characteristics of Non-linear Basic Line Plow

Reducing the working resistance and cutting down the energy consumption has been an important subject for domestic and foreign agricultural machinery researchers. Plow-surface is formed when the basic line move along the direc-trix according to certain rules. The basic line and directrix are two important factors to affect the plow’ s working resist-ance. Research on the base of BTU35, the new plow is designed by using trigonometric function curve instead of straight line as the baisc line. The working resistances are analyzed and compared with finite element method. It was discovered that the new plow reduced working resistance by 2. 5 percents in 5km/h,4. 1 percents in 6km/h, 3. 9percents in 7km/h. Taking the condition of straight line and sine function currature changes into consideration,we can draw a conclusion that the variable curvature plow has better drag reduction effect.