张忠元1，2，张凤丽1，2，郭军军1，2，孙栓1，2
1.内燃机可靠性国家重点实验室，山东潍坊261061；2.潍柴动力股份有限公司发动机研究院，山东潍坊261061
摘要：为减轻空气冷却器支架质量，在保证各项性能满足设计要求的前提下，建立空气冷却器支架的多部件接触有限元分析模型，通过整机多体动力学分析获得空气冷却器质心的冲击加速度，开展空气冷却器支架的强度、疲劳可靠性和连接可靠性分析。结果表明：轻量化设计方案的空气冷却器及支架系统的固有频率有所提升，且前3阶固有频率均大于发动机标定转速的激励频率，能够有效避开共振风险；在振动载荷作用下，轻量化设计后的支架强度、疲劳可靠性和连接可靠性均满足设计要求。
关键词：轻量化设计；冲击载荷；有限元分析；静力学特性；动力学特性
Abstract:In order to reduce the mass of the air cooler bracket, the finite element analysis of multicomponent contact model is established and investigated.The static stress, fatigue strength and connection reliability from the impact load which is obtained from the multibody dynamic analysis of the whole machine,are used for the static and dynamic analysis of the bracket. The results show that the natural frequency of lightweight system increased and first three order natural frequency are greater than calibration excitation frequency, which effectively avoid the resonance risk. At the same time, the static stress, fatigue strength and connection reliability of the optimized bracket meet the requirements.
Keywords:lightweight design;impact load;finite element analysis;statics characteristic;dynamic characteristic
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