中文摘要：

结合经典推土板设计理论和研究成果,对推土板触土曲面结构进行准线形式和切削角的组合设计,采用缩尺模型设计与制作了9个推土板模型。通过室内土槽正交试验研究了触土曲面准线分别为圆弧、抛物线和仿生曲线,切削角分别为50°,55°和60°的9种推土板模型的阻力特性。结果表明准线形式和切削角的交互作用,以及准线形式对工作阻力具有显著影响,显著性水平都达到了0.25。与传统的圆弧曲面推土板相比,抛物面可相对降低工作阻力4.6%,仿生曲面降低16.0%（垂直阻力分别降低4.8%和51.4%）。研究成果对推土板及相关宽齿土壤切削部件的高效节能设计具有较重要的参考价值。

英文摘要：

The power consumed by bulldozer＇s main working parts—bulldozer blade accounts for about40% of the total power of the bulldozer in working process. It has great significance to optimize the structure and working methods of bulldozer blade＇s macroscopic soil-engaging surface,thus decreasing working resistance and increasing energy efficiency. Combined with the classic design theories and research achievements of bulldozer blades,the modular design of directrix form and cutting angle shall be conducted for macroscopic soil-engaging surfaces structure of bulldozer blades. Nine bulldozer blade models with the cutting angles of 50°,55° and 60°,respectively,whose soil-engaging surface directrix consists of arc,parabolic and bionic curve respectively,were fabricated and designed with scale model.The resistance features of nine bulldozer blades were studied through indoor soil bin and orthogonal experiment model. The result shows that the interaction between directrix form and cutting angle,and the directrix form has great influence on working resistance with significance level of 0. 25. Compared with the traditional circular arc surface bulldozing plate,the paraboloid can relatively reduce the horizontal working resistance by 4. 6%,the bionic surface reduced by 16. 0%. The vertical resistance is reduced by4. 8% and 51. 4%,respectively. The research result has important reference value for the high-efficient and energy-saving design of bulldozer blades and wide tine soil cutting components related.