摘要
针对全膜种植模式中覆土装置覆土质量差引起的易受风力破坏、烧苗、出苗受阻等问题,设计了一种适用于全膜覆土机具的跨越式刮板升运链膜上覆土装置。为提高覆土机构的工作性能,构建了覆土装置的实体模型,运用离散单元法模拟仿真试验,结合Box-Behnken试验设计原理,采用三因素三水平响应曲面法,借助DesignExpert软件处理试验结果,建立了覆土宽度和覆土厚度合格率的二次回归模型,分析各因素交互作用对试验指标的影响,优化得到最佳参数组合,即链速与机组前进速度比为1.38、排土口高度为200 mm、排土口宽度为120 mm,并依此进行田间验证试验。试验结果表明,用离散单元法模拟出的覆土宽度值和覆土厚度合格率接近田间重复试验均值,且满足农艺要求。
The mechanical device of covering soil on film with scraper lifting chain was designed to solve the problems including such as wind damage susceptible,burning seedlings,stemming emergence,which caused by the poor covering soil quality of device in whole plastic-film mulching planting pattern. In order to improve the working performance of covering soil mechanism,the entity model of this device was constructed. Using discrete element method to simulate experiment,combined with the experimental design principle of Box-Behnken,and applying response surface methodology with three factors and three levels,the quadratic regression models about width of covering soil and the qualified rate of covering soil thickness were built using Design-Expert software. Through analyzing the influence of factor's interaction on experimental aim,the best combination of parameters are proposed as follows: the ratio of chain speed and operating speed,1.38; the height of dumping soil,200 mm; and the width of dumping soil,120 mm. Field experiment showed that the width of covering soil and the qualified rate of covering soil thickness simulated by discrete element method were close to the average value of repeated test,and it meet the agronomic requirement,thus providing theoretical basis for the design and improvement of the covering soil device.
出处
《干旱地区农业研究》
CSCD
北大核心
2018年第1期281-287,共7页
Agricultural Research in the Arid Areas
基金
国家自然科学基金资助项目(51765004)
公益性行业专项(201503124)
甘肃省高等学校科研项目(2017D-13)
关键词
膜上覆土装置
刮板升运链
离散单元法
响应曲面法
device of covering soil on film
scraper lifting chain
discrete element method
response surface methodology
作者简介
李迪（1992-）,男,河南邓州人,硕士研究生,研究方向为现代旱作农机装备.E-mail：gsauld＠qq.com.;通信作者：孙伟（1980-）,男,甘肃高台人,副教授,硕导,主要从事现代旱作农机装备研究.E-mail：sunw＠gsau.edu.cn.;通信作者吴建民（1958-）,男,甘肃定西人,教授,博导,主要从事保护性耕作技术及机具研究.E-mail：wujm＠gsau.edu.cn.
