Journal of South China University of Technology (Natural Science Edition) ›› 2018, Vol. 46 ›› Issue (3): 29-34,57.doi: 10.3969/j.issn.1000-565X.2018.03.005

• Mechanical Engineering • Previous Articles     Next Articles

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) 

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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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