基于传递函数有理分式的模态参数识别算法研究

Modal Parameter Identification Algorithm Based on the Rational Fraction of Transfer Function

为降低多参考点模态参数识别过程中系数矩阵的计算精度损失,利用传递函数有理分式模型,在正交多项式识别算法的基础上提出一种改进的模态参数识别方法,并给出该算法的实现流程和稳定图的建立方法;通过实测算例对所提出的方法进行验证。结果表明,该方法有效地识别模态参数,并简化参数的计算过程,提高识别效率。该结论将对采用模态参数识别结构的完整性研究提供借鉴。

In order to reduce the precision loss of the coefficient matrix in the process of multiple reference modal parameter identification, an improved algorithm is proposed on the basis of orthogonal polynomial recognition algorithm. The improved algorithm is deduced in detail and the implementation flow chart is also proposed. And then, an experimental platform is setup and a recognition experiment on roller is carried out to validate the accuracy of the improved algorithm. The experimental results indicate that the improved algorithm compared with the original algorithm has the higher identification accuracy with the simpler identification process. The presented algorithm is helpful to identify the geometry parameters of key structures according its modal signal.