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利用简化的叶盘结构有限元模型和基于极值原理的改进Monte Carlo模拟技术,详细分析了叶片安装角失谐对叶盘结构受迫响应特性的影响.分别对6种不同安装角误差的叶盘结构的受迫响应进行了数值计算,得到了各自对应的响应放大因子概率密度曲线,通过曲线比较,分析了叶片安装角误差对叶盘结构受迫响应特性的影响规律.研究表明:安装角误差虽对叶盘结构的固有频率影响较小,但对叶片受迫响应影响是很大的,并且受迫响应幅值放大因子随安装角失谐程度增加而增加.
The simplified leaf disc structure finite element model and the improved Monte Carlo simulation technique based on the extremum principle were used to analyze the effect of blade mounting angle mismatch on the forced response characteristics of the leaf disc structure. The compaction response of the disc structure is numerically calculated and the corresponding probability density curves of the response amplification factors are obtained.The curves of the influence of the blade mounting angle errors on the forced response characteristics of the disc structure are analyzed.The results show that the installation angle Although the error has little effect on the natural frequency of the leaf disc structure, the influence on the forced response of the blade is very large, and the amplification factor of the forced response increases with the increase of the degree of misalignment.