正弦指数曲线型开沟刀片结构参数优化  

Structure Parameters Optimization of Sine Exponential Curve Type Ditching Blade

作　　者：康建明[1,2] 李树君[1] 杨学军[1,3] 刘立晶 

机构地区：[1]中国农业机械化科学研究院,北京100083 [2]新疆农垦科学院机械装备研究所,石河子832000 [3]南方粮油作物协同创新中心,长沙410128 [4]现代农装科技股份有限公司,北京100083

出　　处：《农业机械学报》2016年第11期91-99,17,共10页Transactions of the Chinese Society for Agricultural Machinery

基　　金：北京市科技计划项目(D151100003715003)

摘　　要：为获取正弦指数曲线型开沟刀片的最佳结构参数,依据正弦指数曲线方程和二次正交旋转中心组合设计方案,设计了15种型式的开沟刀片,并进行土槽试验。以弯折角、弯曲半径、切土角为影响因子,以功率消耗和沟深稳定性系数为响应值,利用Design-Expert 8.0.6软件进行回归分析和响应面分析,探求单因子及交互因子对响应值的影响效应,并结合非线性优化计算方法,对正弦指数曲线型开沟刀片的结构参数进行优化计算。结果表明:在土壤坚实度为0.29 MPa、土壤含水率16.2%的条件下,各因子对功率消耗的影响贡献由大到小为:弯折角、切土角、弯曲半径;对沟深稳定性系数的影响贡献由大到小为:切土角、弯折角、弯曲半径。优化所得正弦指数曲线型开沟刀片最佳结构参数:弯折角为86.75°,弯曲半径为12 mm,切土角为13.8°,此时功率消耗理论最小值为32.32 k W,沟深稳定性系数为95.6%,验证试验表明功率消耗最小值为34.27 k W,沟深稳定性系数为92.82%,理论值与试验值误差小于10%,验证了回归模型的正确性。将优化前、后和现有开沟刀片在2种不同土壤条件下进行对比试验,结果表明优化后刀片的功率消耗比优化前分别下降4.28 k W和4.23 k W,沟深稳定性系数分别提高7.12个百分点和7.02个百分点,比现有开沟刀片下降7.68 k W和6.91 k W,沟深稳定性系数提高14.34个百分点和8.34个百分点。研究成果为正弦指数曲线型开沟刀片的优化设计提供了理论参考。In order to obtain the optimum structure parameters of sine exponential curve type trenching blade, according to the equation of sine exponential curve, totally 15 types of furrowing blade were designed and test in soil bin was conducted. A central composite design method of the second order regression orthogonal was carried out with bending angle, bending radius and sliding cutting angle as experiment factors and with power consumption and stability of groove depth as response values. By using Design - Expert 8.0.6 regression analysis method and regression surface method, both single factor and interactive factor on response values were analyzed. Combined with nonlinear optimization calculation method, the structural parameters were calculated optimally. The results obtained under the conditions of soil strength was 0.29 MPa, moisture content was 16.2% , in terms of significant degree, the influence factors of power consumption were bending angle, sliding cutting angle and bending radius; the influence factors of stability of groove depth were sliding cutting angle, bending angle and bending radius. The optimum parameter condition of the sine exponential curve type trenching blade after optimizing was 86.75°of bending angle,12 mm of bending radius and 13.8° of sliding cutting angle. At this time, power consumption achieved theoretical optimum value of 32. 32 kW, stability of groove depth was 95.6%. Through verification by an experiment under optimum condition, the experiment value of power consumption was 34.27 kW, stability of groove depth was 92.82% , which indicated that the experiment results and predicted results were consistent, and regression models established by the experiment were appropriate. According to comparison of trench experiment before and after parameter optimization under two different soil conditions, power consumption fell by 4.28 kW and 4.23 kW, respectively; groove depth stability were increased by 7.12 and 7.02 percentage points, respectively. According to comparison of existed trench

关 键 词：开沟刀片 正弦指数曲线 土槽试验 参数优化 

分 类 号：S222.3[农业科学—农业机械化工程]