华南理工大学学报(自然科学版) ›› 2018, Vol. 46 ›› Issue (3): 29-34,57.doi: 10.3969/j.issn.1000-565X.2018.03.005

• 机械工程 • 上一篇    下一篇

基于子模型的挖掘机结构瞬态动力学研究

冯豪1, 2 杜群贵1 孙有平   

  1. 1. 华南理工大学 机械与汽车工程学院,广东 广州 510640; 2. 广西柳工机械股份有限公司 研究总院,广西 柳州 545007; 3. 广西科技大学 广西土方机械协同创新中心,广西 柳州 545006
  • 收稿日期:2017-03-20 修回日期:2017-10-09 出版日期:2018-03-25 发布日期:2018-03-01
  • 通信作者: 冯豪(1979-),男,博士生,高级工程师,主要从事结构疲劳、动力学研究 E-mail:fenghao2005@163.com
  • 作者简介:冯豪(1979-),男,博士生,高级工程师,主要从事结构疲劳、动力学研究
  • 基金资助:
    广西科学研究与技术开发项目(桂科攻 1598007-46);广西技术创新项目(桂工信科技[ 2015] 267 号) 

Transient Dynamics Analysis for the Structures of the Excavator Based on Sub-Modeling Method
 

 FENG Hao1, 2 DU Qungui1 SUN Youping3    

  1.  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510460,Guangdong,China; 2. R & D Center,Guangxi Liugong Machinery Co. ,Ltd. ,Liuzhou 545007,Guangxi,China; 3. Earth Moving Machinery Collaborative Innovation Center of Guangxi,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China
  • Received:2017-03-20 Revised:2017-10-09 Online:2018-03-25 Published:2018-03-01
  • Contact: 冯豪(1979-),男,博士生,高级工程师,主要从事结构疲劳、动力学研究 E-mail:fenghao2005@163.com
  • About author:冯豪(1979-),男,博士生,高级工程师,主要从事结构疲劳、动力学研究
  • Supported by:
      Supported by the Guangxi Scientific Research and Technology Development Project(1598007-46) and Guangxi Technology Innovation Project([ 2015] 267) 

摘要: 在挖掘机工作装置结构的瞬态动力学分析中,既要考虑油缸刚度、结构刚度对动 态分析的影响,又要考虑得到准确的结构局部( 如焊缝) 应力用于疲劳分析,如按此要求 建立的整体精细模型用于动力学仿真,其工作量是海量的且不现实的. 为此,文中提出了 整体动态模型与局部子模型相结合的方法,用于挖掘机工作装置结构的动态计算; 采用梁 单元、弹簧单元等将整体结构等效为一个简单、高效的动态模型; 对复杂的局部结构再用 精细子模型求解,得到精确局部应力. 最后以某型挖掘机为例进行案例计算和试验测试对 比分析,计算瞬态应力峰值与测试结果的误差小于 8%,结果证明了所提方法和模型的正 确性. 

关键词: 挖掘机, 瞬态分析, 有限元方法, 子模型, 局部应力, 整体动态模型 

Abstract:  In the analysis of transient dynamics of the excavator working device structure,not only the stiffness of both the hydraulic cylinders and the structures,but also the accurate stress of local structures (such as welded seams) applied in fatigue analysis should be taken into consideration. In order to meet these requirements,a global and refined model should be built for dynamics stimulation,which seems to be overwhelming and impractical. Therefore,a method that combines the global dynamic model with local sub-model is proposed to analyze the structural dynamics of the excavator working device. The global structures are simplified to more simple and efficient dynamic model with beam and spring model. Then, the sub-model with refined finite element is adapted to get the accurate local stress at the complex local structures. Finally, the comparison between the analysis and test results of an excavator shows that the error of the transient stress peak value between the calculation and test is less than 8%. The results show that the proposed method and model is correct. 

Key words: excavators, transient analysis, finite element method, sub-model, local stress, global dynamic model

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