| 本文已被：浏览 765次 下载 481次 |
码上扫一扫！ |
| 草地破土切根刀具的刃口曲线设计与优化 |
|
梁方1,2, 王德成1,3, 尤泳1,3, 王光辉1,3, 张晓明1, 贺长彬1, 李帅1
|
|
|
| (1.中国农业大学 工学院, 北京 100083;2.华中农业大学 工学院, 武汉 430070;3.中国农业大学 农业部土壤-机器-植物系统技术重点实验室, 北京 100083) |
|
| 摘要: |
| 为降低退化草地切根改良机械的作业功耗,根据草地切根作业的要求,按照滑切角的变化规律,设计了基于对数螺线、阿基米德螺线、正弦指数曲线、偏心圆弧线的4类16种刀具刃口曲线。通过土槽试验,测得不同种类刃口曲线刀具与土壤作用的牵引力和扭矩,计算得到比功耗大小;拟合不同种类曲线的参数与比功耗的关系,以比功耗最小为目标,优化得到不同种类曲线的最优参数组合,再比较4类刃口曲线最优参数组合下的最小比功耗大小,得到最优的刀具刃口曲线。优化结果表明,初始静态滑切角为40°,静态滑切角的增量与极角的比例系数为-0.1时对应的正弦指数曲线切根比功耗最小,为3 345 kJ/m3,是试验条件下的切根最优刃口曲线。 |
| 关键词: 切根 刃口曲线 土槽试验 比功耗 |
| DOI：10.11841/j.issn.1007-4333.2016.06.012 |
| 投稿时间：2015-06-18 |
| 基金项目:国家自然科学基金(51405493) |
|
| Design and optimization of the edge curve of root-cutting blade in grassland |
|
LIANG Fang1,2, WANG De-cheng1,3, YOU Yong1,3, WANG Guang-hui1,3, ZHANG Xiao-ming1, HE Chang-bin1, LI Shuai1
|
| (1.College of Engineering, China Agricultural University, Beijing 100083, China;2.College of Engineering, Huazhong Agricultural University, Wuhan 430070, China;3.Key Lab of Soil-Machine-Plant System of Chinese Agriculture Ministry, China Agricultural University, Beijing 100083, China) |
| Abstract: |
| To decrease the electricity power used in rut root-cutting, 16 blades of four different types of edge curves (logarithmic spiral, Archimedes spiral, exponential sine curve and eccentric circular arc line) were designed according to the requirement of grassland root-cutting and the change regularity of the sliding cutting angle.Through soil-bin experiment, the pull force and rotation torque of the designed blades were measured, power consumptions were calculated.The relationship between and parameters of the four types of the edge curves was simulated, and the best combination of the parameters of each edge curve was obtained for the smallest power consumption.By comparing the power consumption of different edge curve under the best combination of all parameters, the most suitable edge curve was identified.The result of the experiment optimization indicated that the lowest power consumption reached 3 345 kJ/m3 when the edge curve was exponential sine curve which its beginning static sliding cut angle was 40° and the proportional coefficient between the increment of the static sliding cutting angle and the polar angle was -0.1. |
| Key words: root-cutting edge curve of blade soil-bin experiment specific work |
