为研究发动机外界激振频率对凸轮轴抗共振性能的影响，采用ANSYS Workbench有限元分析软件，建立某型柴油机凸轮轴参数化模型，并进行模态分析，得到该凸轮轴前8阶振动频率及振型；基于机械可靠性应力-强度干涉理论，根据结构固有频率、外界激振频率与两者间规定槛值的关系，可推导出基于多失效模式下系统准失效概率表达式，应用频率可靠性评估方法对凸轮轴进行可靠性评估。分析结果表明：凸轮轴频率可靠度满足设计要求。结合实际工况，在全转速范围内开展整机台架实机环境考核试验，验证了频率可靠性评估理论及优化设计效果。并在此基础上提出避免凸轮轴发生共振失效的方法，可对凸轮轴抗共振性能研究提供支持。

In order to study the influence of the external excitation frequency of the engine on the anti-resonance performance of the camshaft, ANSYS Workbench finite element analysis software was used to establish a parametric model of the camshaft of a diesel engine. The first 8 order vibration frequency and vibration mode of the camshaft were obtained by modal analysis. Based on the stress-strength interference theory of mechanical reliability, according to the relationship between the natural frequency of the structure, the external excitation frequency and the specified threshold value between them, the quasi-failure probability expression of the system based on multiple failure modes can be derived. The frequency reliability evaluation method was used to evaluate the reliability of the camshaft. The analysis results show that the frequency reliability of the camshaft meets the design requirements. Combined with the actual working conditions, the environmental assessment test of the whole machine bench was carried out in the full speed range, and the frequency reliability evaluation theory and optimization design effect were verified. On this basis, a method to avoid the resonance failure of the camshaft was proposed, which can provide support for the study of the anti-resonance performance of the camshaft.