Meshless Model and Application for Heat Transfer of Engine Composite Materials Connecting Rod
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摘要: 利用无网格伽辽金法(Element-free galerkin,EFG)建立了发动机复合材料连杆的传热计算模型,推导了正交各向异性结构的无网格法传热控制方程,通过复合材料平板验证了该模型对混合边界条件传热问题有很好的适应性。利用EFG法计算了不同各向异性因子的复合材料连杆的温度场,并讨论了EFG节点数对精度的影响。结果表明,EFG法的温度计算精度比有限元法高,且各向异性因子小于1时能较好地改善连杆小头的温度场分布,连杆设计时宜选择横向导热系数比纵向大的复合材料。Abstract: A calculation model for heat transfer analysis of internal combustion engines composite materials connecting rod was established with the element-free galerkin (EFG) method, and the heat transfer governing equation for the orthotropic structure based on the meshless method was deduced. The numerical example of composite materials plate was used to verify that the meshless model has a good adaptability for the heat transfer problem under the mixed boundary conditions. The temperature field of the composite materials connecting rod with different anisotropy factor was calculated with EFG method, and the effect of the EFG node number on the calculation accuracy was discussed. The result shows that the temperature based on the EFG method has a higher accuracy than that via FEM, and the temperature distribution of connecting rod small end can be greatly improved when the anisotropy factor is less than 1. The composite materials with the transverse thermal conductivity more than the vertical should be chosen for designing the internal combustion engines connecting rod.
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Key words:
- engine /
- composite /
- heat transfer /
- element-free galerkin method /
- orthotropy
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[1] 贾德文,申立中,毕玉华,等.柴油机连杆大头轴承润滑特性影响因素的研究[J].汽车工程,2012,34(11):981-983,994 Jia D W, Shen L Z, Bi Y H, et al. A study on the factors affecting the lubrication characteristics of connecting rod big-end bearing in diesel engine[J]. Automotive Engineering, 2012,34(11):981-983,994(in Chinese) [2] 郑光泽,袁林.发动机连杆动力学特性对活塞拍击的影响分析[J].汽车工程,2012,34(12):1119-1124,1140 Zheng G Z, Yuan L. A research on the effects of dynamic characteristics of connecting rod on the piston slap of engine[J]. Automotive Engineering, 2012,34(12):1119-1124,1140(in Chinese) [3] Chen L W, Ku D M. Dynamic stability analysis of a composite material connecting rod by the finite element method[J]. Engineering Computations, 1991,8(1):57-68 [4] Chen N L, Han L Z, Zhang W M, et al. Enhancing mechanical properties and avoiding cracks by simulation of quenching connecting rods[J]. Materials Letters, 2007,61(14-15):3021-3024 [5] 戚刚,吴昌华,张南林.发动机连杆精细有限元分析模型和算法的研究[J].中国机械工程,2001,12(3):282-284 Qi G, Wu C H, Zhang N L. A study on modeling and algorithm of precise FE analysis of engine connecting-rod[J]. China Mechanical Engineering, 2001,12(3):282-284(in Chinese) [6] 陶文铨,吴学红,戴艳俊.无网格方法在流动和传热问题中的应用[J].中国电机工程学报,2010,30(8):1-8 Tao W Q, Wu X H, Dai Y J. Applications of meshless methods in fluid flow and heat transfer problems[J]. Proceedings of the CSEE, 2010,30(8):1-8(in Chinese) [7] 张建平,蒋炎坤,刘欣,等.发动机活塞传热的无网格RKPM计算模型及应用[J].内燃机学报,2013,31(1):78-83 Zhang J P, Jiang Y K, Liu X, et al. Meshless RKPM calculation model and its application in engine piston heat transfer[J]. Transactions of CSICE, 2013,31(1):78-83(in Chinese) [8] 张建平,蒋炎坤,万里平,等.发动机活塞传热的三维无网格法模拟及试验验证[J].内燃机工程,2015,36(3):85-91 Zhang J P, Jiang Y K, Wan L P, et al. Simulation of engine piston heat transfer with 3D meshless method and its experimental verification[J]. Chinese Internal Combustion Engine Engineering, 2015,36(3):85-91(in Chinese) [9] Jaberzadeh E, Azhari M, Boroomand B. Thermal buckling of functionally graded skew and trapezoidal plates with different boundary conditions using the element-free Galerkin method[J]. European Journal of Mechanics-A/Solids, 2013,42:18-26 [10] Yang H T, He Y Q. Solving heat transfer problems with phase change via smoothed effective heat capacity and element-free Galerkin methods[J]. International Communications in Heat and Mass Transfer, 2010,37(4):385-392 [11] Zhang X H, Ouyang J, Zhang L. Matrix free meshless method for transient heat conduction problems[J]. International Journal of Heat and Mass Transfer, 2009,52(7-8):2161-2165 [12] Singh A, Singh I V, Prakash R. Meshless element free Galerkin method for unsteady nonlinear heat transfer problems[J]. International Journal of Heat and Mass Transfer, 2007,50(5-6):1212-1219 [13] Belytschko T, Lu Y Y, Gu L. Element-free Galerkin methods[J]. International Journal for Numerical Methods in Engineering, 1994,37(2):229-256 [14] Chang Y P, Kang C S, Chen D J. The use of fundamental green's functions for the solution of problems of heat conduction in anisotropic media[J]. International Journal of Heat and Mass Transfer, 1973,16(10):1905-1918 [15] Wu S C, Liu G R, Cui X Y, et al. An edge-based smoothed point interpolation method (ES-PIM) for heat transfer analysis of rapid manufacturing system[J]. International Journal of Heat and Mass Transfer, 2010,53(9-10):1938-1950
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