The invention relates to an operating
modal parameter identification method for
principal component analysis on basis of
wavelet threshold denoising. Measurement
noise in
vibration response signals of a small damping mechanical structure can be effectively filtered out, the operating mode (a
modal inherent frequency and
modal vibration shape) of a
system can be identified, operating
modes (modal inherent frequency and modal vibration shapes) with small contribution amount in the response
signal can be even identified, and a PCA modal parameter identification
algorithm and physical significance interpretation and certification are endowed. The method is applied to three-dimensional operating modal parameter identification as well as equipment fault diagnosis and
health condition monitoring. The invention further relates to an operating modal
parameter analysis meter based on the method. Multiple vibrating sensors are arranged on key points of the mechanical structure, operating modal parameter identification is carried out on the
vibration response signals obtained through measurement, changes of characteristics of the
system structure can be understood, and the operating modal
parameter analysis meter can be applied to fault diagnosis and
health condition monitoring of large-scale project structures.