摘要
拖移圆形喷灌机数量在不断增加,但在拖移过程中存在诸多影响因素未能从理论上加以阐明。对拖移过程的受力情况进行分析,以机组不发生侧翻为约束条件,建立了机组从一个作业点拖移到另外作业点的拖移路径中相邻跨体夹角α的约束不等式数学模型,并推导出拖移路径的最小曲率半径;同理,建立了坡度角β的约束不等式数学模型。在此基础上,推导出在α和β共同作用下的机组不侧翻约束不等式,通过对实际情况进行简化,得出跨体夹角不大于5°的情况下,通过坡度最大值不能超过10°的简易结论。在风力超过10 m/s的情况下不宜进行拖移,在此过程中,行走速度不宜超过2 km/h。
Now,more and more center pivot irrigation systems have been put into service.But what are the effect factors in drag operation,and how to explain those in theory？ In this paper,based on force analysis through the drag process,some mathematics models were established,and then the minimal radius of curvature of walk route and tower turnover constraint condition under included angle α and slope angle β combined action are deduced.And it is suggested that when α less was than 5 degree,the β muse be no more than 10 degree in technical application.The research results provide some theory support for users and designer in center pivot irrigation drag application.
出处
《节水灌溉》
北大核心
2010年第9期72-74,77,共4页
Water Saving Irrigation
基金
国家高技术研究发展计划("863"计划)资助项目(2006AA100211)
关键词
拖移
圆形喷灌机
受力分析
数学模型
dragged
center pivot irrigation system
force analysis
mathematical model
