单输入单输出的频域模态参数识别方法，正交多项式拟合法，通过拟合频响函数曲线得到结构的固有频率、阻尼-Single-input single-output frequency domain modal parameter identification method, orthogonal polynomial fitting, the natural frequency of the structure obtained by fitting the curve of the frequency

单输入单输出的频域模态识别方法，导纳圆拟合法，通过画出导纳圆图识别固有频率-Single-input single-output frequency domain modal identification, admittance circle fitting by plotting the admittance Smith chart to identify the natural frequency