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根据航空发动机整机结构系统功能和设计要求,对整机结构效率内涵进行了详细阐述,基于整机载荷特征,建立了从抗变形能力和力学环境适应能力两方面对整机进行结构效率评估的参数体系.通过对转静间隙变化量、应变能分布系数、敏感度系数等评估参数归一化方法及结构效率系数运算法则的建立,明确了结构效率的分析流程.以某小涵道比涡扇发动机为对象进行结构效率评估,详细给出了结构效率的计算过程.针对该小涵道比涡扇发动机的另一种结构方案2,基于结构效率评估方法进行评估并与原结构方案进行了对比分析,结果表明:原结构方案在抗变形能力和力学环境适应能力两方面均优于结构方案2,结构效率系数比结构方案2高出0.11,初步验证了结构效率评估方法的工程实用性.
According to the functions and design requirements of the structural system of aeroengine, the connotation of structural efficiency of the complete machine is elaborated. Based on the characteristics of whole machine load, the structural efficiency of the whole machine is established from the aspects of deformation resistance resistance and mechanical environment adaptability Parameter system.Through the normalization of parameters such as the change of static clearance, strain energy distribution coefficient and sensitivity coefficient, and the establishment of structural efficiency coefficient algorithm, the analysis flow of structure efficiency is clarified.With a small bypass vortex Fan engine as the object of structural efficiency assessment, detailed calculation of the structural efficiency of the process.For the small-bypass turbofan engine another structural program 2, based on the assessment of structural efficiency assessment method and the original structure of the program The results show that the original structure scheme is superior to the structure scheme 2 in both the deformation resistance ability and the mechanical environment adaptability, and the structural efficiency coefficient is 0.11 higher than that of the structure approach 2, which proves the engineering practicability of the structural efficiency assessment method.