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A Sub-Modeling Technique to Balance Force System Boundary Condition

Volume 13, Number 3, May 2017 - Paper 8 - pp. 323-329


1School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
2XCMG State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery, Xuzhou 221000, China

(Received on August 1, 2016; Revised on December 21, 2016; Accepted on April 7, 2017)


Revolute joints and sliding joints are essential mechanical elements connecting moving parts of machineries. When implementing the whole machine/global modeling, the connection joints and their local detailed geometric features are usually simplified in order to improve the computational efficiency and avoid convergence difficulties. These kinds of simplification strategies may lead to the problem that the accurate stress in the vicinity of the simplified local regions could not be obtained from the analysis of the global model. In such cases, subsequent sub-modeling analyses are usually employed to obtain the accurate stress results in these regions. Simplification of the local features in the model may sometimes result in significant changes in stiffness of these local regions. When traditional interpolated displacement type of boundary conditions are used to indirectly apply loading to the sub-model, the actual loading added to the sub-model boundary could be much different to the loading derived from the global model due to the stiffness error of the global model. In contrast to applying the displacement boundary condition, a method of directly implementing forces to the sub-model cut-boundaries has been proposed in this paper. These forces applied to the cut-boundaries could be obtained from the analysis results of the global model. Numerical analysis results have shown that the newly proposed sub-modeling technique can load the model more accurately than the traditional sub-model method and the analysis accuracy is not sensitive to the degree of simplification of the global model. The predicted stress results for a telescopic boom of a truck-mounted crane have also been validated by experimental results.


References: 11

[1]. Liu, H. F., Li, S., Ke, Z. Q. The Contact Model of Connecting Mechanism and its Application Basing on the Sub-model method. Aircraft Design . 2009; 29(2): 25-29.
[2]. Chen, K. K., Liu, L. Q., Wang, H. Analysis of Through-the-Thickness Stress Distribution in Thick Laminate Multi-Bolt Joints Using Global-Local Method. Journal of Shanghai jiaotong University, Science. 2013; 18(3): 326-333.
[3]. Rajasekaran, R., Nowell, D. On the finite element analysis of contacting bodies using submodelling. The Journal of strain analysis for engineering design. 2005; 40(2): 95-106.
[4]. Tan, Y. Q., Li, L. K., Cao, P. Extended finite element analysis of ultimate load-bearing capacity for dowel bar system in cement concrete pavement. Transaction of the Chinese Society of Agricultural Engineering. 2012; 28(24): 62-69.
[5]. Zou, W. S., Zuo, Z. X., Feng, H. H. Application of sub-model method in the strength analysis of engine assembly structure. Acta Armamentarii. 2002; 23(2): 270-272.
[6]. You, Z., Li, G. Y., Cheng, A. G. Application of sub-model method for missile structure analysis. Journal of solid rocket technology. 2014; 37(2): 253-257.
[7]. Zhou, J. F., Zhong, Y. Y. A new method for body structure analysis based on stress recovery of submodel. Chinese mechanical engineering. 2013; 24(12): 1671-1675.
[8]. Wang, L. P., Xu, H. Y., Guan, L. W. Topology optimization of single components in assembly parts based on submodeling. Journal of Tsinghua University : Science and Technology. 2013; 53(4): 476-481.
[9]. Li, A. Q., Wang, H. Stress analysis on steel box girders of super-long-span suspension bridges with sub model method. Engineering mechanics. 2007; 24(2): 80-84.
[10]. Li, Q., Mo, J., Yang, Z. X. Research of the finite element method on diesel connect rod analysis based on submodel. Ship science and technology. 2010; 32(8): 44-47.
[11]. Gilio, M. FEM submodelling fatigue analysis of a complex helicopter component. International Journal of fatigue. 1999; 21(3): 445-455.


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