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以谐调叶盘有限元模型解析模态和真实失谐结构的测量模态作为基础信息,提出一种整体叶盘结构失谐识别方法.该方法基于经典模态减缩方法(SNM)降阶技术,降低了识别过程的计算花费以及对基础信息的要求;采用子矩阵型技术使得失谐参数定义更加的自由,并使得该方法具有模型修正的功能;利用最可能向量技术处理实验测量模态振型,可有效的限制测量噪声、非线性等因素对识别过程的影响.最后以一个真实叶盘结构的仿真分析证明了该方法的有效性.
Based on the measurement modal of finite element model of harmonic leaf disc and the measurement modal of true detuning structure, a method to identify the detuning of leaf disc structure is proposed.Based on the classical reduction mode reduction (SNM) technique, The computational cost of the identification process and the requirements for basic information are reduced. The use of sub-matrix technology makes the definition of detuning parameters more freedom and makes the method have the function of model correction. The most probable vector technique is used to deal with the experimentally measured mode shapes , Which can effectively limit the impact of measurement noise, nonlinearity and other factors on the identification process.Finally, the simulation of a real leaf disc structure shows that the method is effective.