matlab 基础上通过最小二乘法进行模态参数识别，得出固有频率，振型，阻尼比，图形-by the least squares method matlab based on the identification of modal parameters obtained natural frequency, mode shape, damping ratio, graphics

递推阻尼最小二乘法，动态系统模型系统辨识(Recursive damping least square method)