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在对干摩擦阻尼非线性系统响应求解的高阶谐波平衡法、摩擦力时域求解的时间推进法以及时频转换(AFT)法中的关键技术进行介绍的基础上,采用将时频转换法与高阶谐波平衡法相结合的方法对典型航空发动机叶片缘板阻尼器宽频多阶次激励的减振效果进行计算与分析.通过与直接积分法获得的结果进行对比,表明该方法具有较高的计算精度,且计算效率远远高于直接积分法.对比了保留不同谐波阶次时的计算结果,说明对航空发动机中宽频多阶次激励下的干摩擦阻尼系统进行分析计算时需要保留非线性力的高阶谐波成分,才能获得准确的结算结果.干摩擦阻尼器对于不同频率成分激起的共振峰值的最优正压力值不同,实际中应针对激振频率带宽及具体的减振需求,对阻尼器的设计参数进行优化设计,使得系统在整个工作频带上振动响应最小.
Based on the introduction of the high-order harmonic balance method for solving the response of the dry friction damping nonlinear system, the time advancement method for solving the frictional time domain and the key technologies in the time-frequency conversion (AFT) method, Method and high-order harmonic balance method are used to calculate and analyze the vibration reduction effect of wide-band and multi-order excitation of aeroengine blade dampers.Compared with the results obtained by the direct integral method, High computational accuracy, and the computational efficiency is much higher than that of the direct integral method.Compared with the results of different harmonics orders reserved, it is necessary to analyze and calculate the dry friction damping system under wide-band and multi-order excitation in aeroengine To retain accurate nonlinear high-order harmonic components in order to obtain accurate results.Dry friction damper for different frequency components of the resonance peak value of the optimal positive pressure is different, in fact, should be based on the excitation frequency bandwidth and the specific Damping requirements, the design parameters of the damper to optimize the design, making the system in the entire operating frequency band vibration response minimum.