汽油机活塞环岸断裂原因分析及改进
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摘要
针对某发动机试验过程中出现的环岸断裂现象,对活塞环岸进行裂纹源区分析、有限元分析计算,结合台架压力监测数据,确定环岸断裂的主要原因为缸内爆燃爆震产生的异常压力冲击。将产生的异常压力采用有限元分析验证并对失效部位进行改进和优化,增强失效部位结构强度,满足承载能力及疲劳强度要求。改进设计后的活塞没有出现活塞环岸断裂的现象,顺利通过各项可靠性试验。
For the piston ring land breakage occurring in the engine reliability test, the analysis of the origin of crack and material performance, the analysis of the bench pressure data and FEA analysis are taken to find the reasons. Combined with the pressure monitoring data of the bench, the final reason for the crack is the abnormal pressure impact caused by in-cylinder detonation and knocking. The abnormal pressure generated is verified by finite element analysis and the failure spots is improved and optimized, and the structural strength of the failure spots is enhanced to meet the bearing capacity and fatigue strength requirements. A new test is conducted again, the optimized piston goes through a variety of reliability tests,the problem of ring land crack is solved.
For the piston ring land breakage occurring in the engine reliability test, the analysis of the origin of crack and material performance, the analysis of the bench pressure data and FEA analysis are taken to find the reasons. Combined with the pressure monitoring data of the bench, the final reason for the crack is the abnormal pressure impact caused by in-cylinder detonation and knocking. The abnormal pressure generated is verified by finite element analysis and the failure spots is improved and optimized, and the structural strength of the failure spots is enhanced to meet the bearing capacity and fatigue strength requirements. A new test is conducted again, the optimized piston goes through a variety of reliability tests,the problem of ring land crack is solved.
引文
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[2]熊培友,孙晓,刑小兵,等.基于动力学模拟的汽油机活塞裙部刚度研究[J].内燃机与动力装置,2016,33(6):47-51.
[3]熊培友,章健,刘世英,等.发动机活塞销孔偏心对摩擦磨损影响的研究[J].内燃机工程,2017,38(3):117-122.
[4]祝传亮,王奇峰,刘小斌,等.汽油机活塞顶部开裂原因分析及改进措施[J].内燃机与动力装置,2016,33(4):57-60.
[5]刘涛,祝传亮,高玉贵.汽油机活塞喷油缺口裂纹失效分析及设计改进 [J].内燃机与动力装置,2013,30(4):38-41.
[6]徐涛,熊培友,赵旭东,等.基于动力学仿真的船用活塞型线优化设计[J].内燃机与动力装置,2015,32(6):6-9.
[7]熊培友,高渤,刘涛,等.基于EXCITE软件模拟的发动机漏气量改进研究[J].内燃机与动力装置,2015,32(3):25-28.
[8]吴国栋,刘世英,郭伟.活塞热负荷测试及有限元分析[J].山东内燃机,2004(6):4-7.
[9]薛明德,丁宏伟,王利华.柴油机活塞的温度场、热变形与应力三维有限元分析[J].兵工学报,2001,22(1):11-14.
[10]郑永刚,马学军,马呈新,等.有限元分析与疲劳评价在活塞开发中的应用[J].柴油机,2005,27(3):21-23.
[11]王世利,张文利,李玉红,等.活塞结构对分析结果影响的探讨[J].农业装备与车辆工程,2011(1):37-39.
[12]张卫正,刘金祥,原彦鹏,等.内燃机失效分析与评估[M].北京:北京航空航天大学出版社,2011.