摘要
为明确ⅠT245型旋耕刀(刀座式)切割重黏土过程,基于光滑粒子流体动力学(SPH)方法对旋耕刀-土壤进行建模,运用ANSYS/LS-DYNA软件进行仿真,分析单个旋耕刀在刀盘转速200 r/min、机具前进速度0.6 m/s、耕深0.12m工况下的切土扭矩情况,仿真平均扭矩为5.84N·m,以库伦定理和朗肯土压力理论为依据计算的理论平均扭矩为6.42N·m,二者误差为8.98%。分别使用理论方法和有限元方法,以机具前进速度、刀盘转速和耕深为影响因素,以比功为评价指标,进行正交旋转组合试验,得到旋耕比功与机具前进速度、刀盘转速及耕深的回归方程,表明在符合农艺要求的情况下,应尽可能选择较大的机具前进速度和耕深,较小的刀盘转速。
In order to clarify the process of cutting heavy clay with the type IT245 rotary cultivator(knife seat type), the rotary cultivator-soil was modeled based on the smoothed particle hydrodynamics(SPH) method. Simulating by ANSYS/LS-DYNA software, the soil-cutting torque of a single rotary cutter was analyzed under the conditions of cutter head speed of 200 r/min, forward speed of 0.6 m/s, and ploughing depth of 0.12 m. The average simulated torque was 5.84 N· m. The theoretical average torque is 6.42 N·m calculated by the Ken earth pressure theory. The error between the two is 8.98%. Using the theoretical method and the finite element method respectively, the rotation-orthogonal combination test was carried out with the forward speed, the rotating speed of the cutter roller and the ploughing depth as the influencing factors, and the specific work as the evaluation index. The regression equation of the specific work of the rotary tiller was obtained dependent on the forward speed of the machine and the speed of the cutter head and the speed of the cutter head. It indicated that the larger forward speed and ploughing depth and the smaller cutter shaft speed should be selected as far as possible in the case of meeting the agronomic requirements.
作者
钟嘉雄
任述光
吴明亮
ZHONG Jiaxiong;REN Shuguang;WU Mingliang(College of Mechanical and Electrical Engineering,Hunan Agricultural University,Changsha,Hunan 410128,China;Hunan Key Laboratory of Intelligent Agricultural Machinery and Equipment,Changsha,Hunan 410128,China)
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第6期744-748,共5页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省自然科学基金项目(2021JJ40249)
湖南省高新技术产业引领计划项目(2020NK2002)。
关键词
刀座式旋耕刀
土壤切削
数值模拟
光滑粒子流体动力学
rotary tiller
soil cutting
numerical simulation
smoothed particle hydrodynamics(SPH)
