PARAMETER IDENTIFICATION OF DYNAMIC CHARACTERISTICS FOR STATIC ECCENTRIC SQUEEZE FILM DAMPER BASED ON EMPIRICAL WAVELET TRANSFORM

ObjectiveAiming at the periodic time-varying dynamic characteristics of static eccentric squeeze film dampers (SFD), a parameter identification method based on empirical wavelet transform (EWT) is proposed.MethodsThe EWT method was applied to identify the dynamic characteristics. The signal spectrum was adaptively divided to extract effective amplitude-modulation-frequency-modulation components with tightly supported Fourier spectra. Subsequently, the required time-varying stiffness and damping parameters were solved using the least squares method.ResultsSimulation results show that the proposed method accurately identifies the time-varying parameters of a single-degree-of-freedom system. Application to test data from bidirectional excitation tests of SFD demonstrates that the time-varying stiffness and damping parameters are captured more precisely. This method provides an effective approach for the design and optimization of squeeze film dampers.