考虑配气机构冲击的气缸盖结构动力学仿真分析

摘要: 配气机构的冲击作用会对柴油机气缸盖的应力场分布产生较大的影响。首先建立了某柴油机配气机构的多体动力学仿真模型，获得气门底座对于气缸盖的气门座圈的循环冲击载荷。在此基础上，综合考虑热应力及循环机械应力和冲击压力作用，对含气缸盖、机体、冷却水套等的组合结构模型进行瞬态动力学响应分析，对比分析了配气机构循环冲击对气缸盖的结构强度的影响大小。结果表明：相比于恒定等效的配气底座冲击作用力的加载，采用瞬态动力学并考虑变化配气机构底座冲击作用影响下得到的气缸盖应力场分布，气缸盖进排气门座圈处的应力值明显增加，应力值增幅可达到10%左右；火力面处的应力值也会增加，局部应力增幅可以达到30 MPa；同时，气缸盖的整体应力场也出现了不同程度的增加。
- 内燃机 /
- 气缸盖 /
- 配气机构 /
- 循环冲击 /
- 瞬态动力学
Abstract: The impact of valve-train could have a great effect on the stress distribution of cylinder head. Firstly, In order to get the cycle impact load of the cylinder head valve seat resulting from the valve-train, the multi-body dynamics simulation model for a diesel engine valve train was established. After that, it is necessary to analyze the alteration of the stress distribution of cylinder head due to the impact load of valve-train. Based on this results, considering the influence of thermal stresses and cyclic mechanical stress and impact pressure, the combination structure model which containing the cylinder head, the body, cooling water jacket and other related component was established to simulate the transient dynamic response. Finally, it is also required to compare the difference between the two multi-body dynamics simulation models. The results show that the stress distribution of cylinder head which considering the variable impact pressure of the valve-train display a more reliable conclusion. Besides, the stress of cylinder head intake and exhaust valve seat were at significantly augmented and its value can increase by 10%. In addition, stress at the fire deck surface also got augmented and its value can increase to 30 MPa. Meanwhile, the overall stress field of the cylinder head has been varying degrees of increase.
- internal combustion engine /
- cylinder head /
- valve-train /
- cycle impact /
- transient dynamic

HTML全文

参考文献(12)

[1]	刘忠民,俞小莉,沈瑜铭.配气机构动力学模型的比较研究[J].浙江大学学报(工学版),2005,39(12):1941-1945 Liu Z M, Yu X L, Shen Y M. Comparison of valve train dynamic models[J]. Journal of Zhejiang University (Engineering Science), 2005,39(12):1941-1945 (in Chinese)
[2]	曹晓辉,姜树李,郭晨海,等.内燃机配气机构的动力学虚拟仿真研究[J].内燃机工程,2009,30(2):65-68 Cao X H, Jiang S L, Guo C H, et al. Research on dummy simulation for dynamics of valve train system in internal combustion engine[J]. Chinese Internal Combustion Engine Engineering, 2009,30(2):65-68 (in Chinese)
[3]	Gocmez T, Pischinger S. A contribution to the understanding of thermomechanical fatigue sensitivities in combustion engine cylinder heads[J]. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2011,225(4):461-477
[4]	刘勤,姬广振,侯新荣,等.热固耦合条件下气缸盖结构可靠性设计分析[J].车用发动机,2011,(5):68-71 Liu Q, Ji G Z, Hou X R, et al. Reliability design and analysis of engine cylinder head in thermosetting coupling conditions[J]. Vehicle Engine, 2010,(5):68-71 (in Chinese)
[5]	Flores P, Koshy C S, Lankarani H M, et al. Numerical and experimental investigation on multi-body systems with revolute clearance joints[J]. Nonlinear Dynamics, 2011,65(4):383-398
[6]	Liu C S, Zhang K, Yang L. The compliance contact model of cylindrical joints with clearances[J]. Acta Mechanica Sinica, 2005,21(5):451-458
[7]	郭良平,张卫正,王长园,等.柴油机气缸盖传热规律研究[J].北京理工大学学报,2011,31(3):277-282 Guo L P, Zhang W Z, Wang C Y, et al. Heat transfer investigation on a diesel engine cylinder head[J]. Transactions of Beijing Institute of Technology, 2011,31(3):277-282 (in Chinese)
[8]	廖日东,左正兴,邹文胜.温度对气缸盖应力分布影响的研究[J].内燃机学报,2001,19(3):253-257 Liao R D, Zuo Z X, Zou W S. The effect of temperature field on stress distribution of cylinder head[J]. Transactions of CSICE, 2001,19(3):253-257 (in Chinese)
[9]	郭立新,杨海涛,夏兴兰.某汽油机气缸盖循环瞬态温度场计算[J].现代车用动力,2008,(2):16-21 Guo L X, Yang H T, Xia X L. Numerical simulation of cyclic transient temperature field in a gasoline engine cylinder head[J]. Modern Vehicle Power, 2008,(2):16-21 (in Chinese)
[10]	Whitelaw J H, Payri F, Arcoumanis C, et al. Thermo-and fluid dynamic processes in diesel engines 2[M]. Berlin Heidelberg: Springer-Verlag, 2004
[11]	何联格,左正兴,向建华.考虑两相流沸腾传热的气缸盖温度场仿真研究[J].内燃机工程,2013,34(3):32-38 He L G, Zuo Z X, Xiang J H. Simulation study on cylinder head temperature field with consideration of two-phase flow boiling heat transfer[J]. Chinese Internal Combustion Engine Engineering, 2013,34(3):32-38 (in Chinese)
[12]	Bigot B, Bonometti T, Lacaze L, et al. A simple immersed-boundary method for solid-fluid interaction in constant-and stratified-density flows[J]. Computers & Fluids, 2014,97:126-142