摘要
随着某汽油机的技术升级,排气歧管隔热罩由单层改进为双层中空结构,但在进行发动机台架试验过程中出现了开裂现象。通过对隔热罩的模态、应力分布、断口及振动进行分析,其开裂的根本原因为振动疲劳引起,而解决方法是采用合理布置加强筋的方式提高其局部或整体刚度以减小振动,优化后的设计方案通过了通用全球发动机耐久试验和热循环试验。
With the technical upgrading of a gasoline engine, the exhaust manifold heat shield is improved to a double layer hollow structure by a single layer, but the cracking phenomenon occurs during the engine bench test. Through the analysis of the modal, stress distribution, fracture and vibration of the heat shield, the root cause of the crack is vibration fatigue. The solution is to use a reasonable arrangement of reinforcement to improve the local or overall stiffness to reduce vibration, the optimized design scheme through the GED （Global Engine Durability） and GETC（Global Engine Thermal Cycle） test bench.
出处
《装备制造技术》
2017年第2期159-161,172,共4页
Equipment Manufacturing Technology
关键词
隔热罩
振动疲劳
刚度
加强筋
heat shield
vibration fatigue
stiffness
reinforcement
