Finite element analysis of arm of SR100 vertical impact sprinkler
Li Hong1, Liu Zhenchao1, Tang Pan1, Wang Chao2
1.National Research Center of Pumps, Jiangsu University, Zhenjing, Jiangsu 212013, China; 2.Patent Examination Cooperation Jiangsu Center of the Pacent Office, SIPO, Suzhou, Jiangsu 215000, China
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 applied 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 deflector 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.
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, 32(5): 429-434.
Li Hong, Liu Zhenchao, Tang Pan, Wang Chao. Finite element analysis of arm of SR100 vertical impact sprinkler. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(5): 429-434.
[1]陈雷.垂直摇臂式喷头运动原理的研究[D].北京:华北水利水电学院北京研究生部,1985.[2]李世英.喷灌喷头理论与设计[M].北京:兵器工业出版社,1995.[3]王福星.摇臂式喷头的力学原理[J].喷灌技术,1980(1):27-37. Wang Fuxing.Mechanical principal of the impact sprinkler[J].Sprinkler Irrigation Technique, 1980(1):27-37.(in Chinese)[4]王泽.摇臂式喷头摇臂强度的分析与计算[J].排灌机械,1994,12(2):55-59. Wang Ze. Analysis and computation on structure strength of the impact sprinkler[J].Drainage and Irrigation Machinery,1994,12(2):55-59.(in Chinese)[5]樊桂林,梁芝兰.摇臂式喷头摇臂应力分布的试验研究[J].排灌机械, 1995,13(2): 34-36. Fan Guilin, Liang Zhilan. Experimental research on the stress distribution of impact sprinkler[J]. Drainage and Irrigation Machinery,1995,13(2):34-36.(in Chinese)[6]王祺铭,严海军,剧锦三,等.PY140型摇臂式喷头摇臂碰撞过程数值模拟[J].农业机械学报,2010,41(1):86-91. Wang Qiming, Yan Haijun, Ju Jinsan, et al. Numerical simulation of swing arm impact process to the PY140 impact sprinkler[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010,41(1):86-91.(in Chinese)[7]杨启志,黄国全,陈龙,等. 一平移两转动三自由度减振平台的动力学分析 [J].江苏大学学报:自然科学版,2012,33(4):425-429. Yang Qizhi,Huang Guoquan,Chen Long, et al. Kinetic analysis of parallel vibration platform with 3-DOF of one translation and two rotations [J].Journal of Jiangsu Uni-versity:Natural Science Edition, 2012,33(4):425-429.(in Chinese)[8]徐宇平,袁寿其, 张金凤,等. ZJ-200-25型螺旋离心泵转子静力学分析[J].排灌机械工程学报,2012,30(3):254-259. Xu Yuping,Yuan Shouqi,Zhang Jinfeng,et al. Static analysis on rotor of type ZJ-200-25 screw centrifugal pump[J].Journal of Drainage and Irrigation Machinery Engineering, 2012,30(3):254-259.(in Chinese)[9]Moghimi H, Ronagh H R.Impact factor for a composite steel bridge using non-linear dynamic simulation[J].International Journal of Impact Engineering, 2008,35(11):1228-1243.[10]Zhao Ming,Teng Bin,Liu Shuxue.Numerical simulation of improved boussinesq equations by a finite element method[J].Journal of Hydrodynamics,2003,15(4):31-40.[11]陈燕,蔡伟亮,邹湘军,等. 荔枝的力学特性测试及其有限元分析[J].农业工程学报,2011,27(12):358-364. Chen Yan, Cai Weiliang, Zou Xiangjun et al. Mechanical properties test and finite element analysis for litchi[J]. Transactions of the CSAE, 2011, 27(12):358-364.(in Chinese)[12]周培源.理论力学[M].北京:科学出版社,2012.[13]殷之平. 结构疲劳与断裂[M].西安:西北工业大学出版社,2012.[14]秦大同,谢里阳. 现代机械设计手册:疲劳强度与可靠性设计[M].北京:化学工业出版社,2013.[15]吴宗泽. 机械零件设计手册[M].北京: 机械工业出版社, 2004.
