一种宽频带模态识别算法的快速实现

Fast Implementation for Broadband Modal Identification

多参考点最小二乘复频域法(p-LSCF)是近几年来提出的宽频带模态参数识别算法,该方法在抗干扰能力、识别密集模态以及处理大阻尼复杂结构方面具有非常好的特性。为了提高模态参数的识别速度,采用FFT运算实现了该识别方法的快速计算。最后通过仿真算例与实测算例进行验证。结果表明:在不损失精度的情况下,能够提高参数识别速度。

A poly-reference least square complex frequency-domain is a broadband modal identification algorithm developed in recent years. It has many advantages in handling high noisy data, closely coupled modes and high damping structure. To improve modal parameter identification, a fast implementation of p-LSCF is proposed by using FFT algorithm. A simulation case and an application case are used to validate the fast implementation. Results show that the fast implementation can improve the modal identification without the accuracy loss.