排灌机械工程学报Issue(5)：429-434,6.DOI:10.3969/j.issn.1674-8530.13.0029
SR100垂直摇臂式喷头摇臂有限元分析
Finite element analysis of arm of SR100 vertical impact sprinkler
摘要
Abstract
The arm of a vertical impact sprinkler is one main part for bearing a load.The structure of the arm was simplified and the forces acting on it were calculated based on an analysis of the forces ap-plied on the deflector in the sprinkler.Besides,the hydraulic force generated by a water jet impacting on the arm was figured out by using a theoretical analysis.Modal,static,and fatigue analyses for the arm were conducted by using finite element method on ANSYS Workbench.Eventually,the natural frequency and vibration mode of the arm at each modal are obtained,showing the vibration modes are mainly presented by bending,twisting and local deformations.When the arm works under the frequen-cy less than 41 .785 Hz,its vibration modes are usually in the first order.A stress distribution in the arm is generated in the static analysis,and a stress concentration is found in the position where the de-flector is installed.In the fatigue analysis,it is shown that the safety factor varies greatly across the arm and the minimum factor is found to be 1 .229 1 in front end of the arm.This means that crack or fracture can occur easily in that portion in the arm in a long-term operation,and the strength of that portion should be strengthened.In order to improve the stability and reliability of the arm of sprinkler in operation,the local configuration with stress concentration in the arm may need to be redesigned or the arm may adopt a material with even stronger strength.关键词
垂直摇臂式喷头/静力学/疲劳特性/模态分析/可靠性Key words
vertical impact sprinkler/statics/fatigue properties/modal analysis/reliability分类
农业科技引用本文复制引用
李红,刘振超,汤攀,王超..SR100垂直摇臂式喷头摇臂有限元分析[J].排灌机械工程学报,2014,(5):429-434,6.基金项目
国家863计划项目（2011AA100506）；国家农业科技成果转化资助项目 （）
