Inverse identification method of dynamic load of propulsion shafting bearings based on measured data

In order to solve the problem in accurate identification of dynamic load of marine propulsion shaft⁃ ing bearings, this paper proposes a kind of frequency-domain inverse identification method based on inver⁃ sion of frequency response functions by using full measured data as well as the corresponding data processing and evaluation methods. Then, on the propulsion shafting vibration test platform, radial bearing dynamic load identification tests under three types of external excitation were carried out to verify the proposed method. The test results show that the identification results of bearing dynamic load under unbalanced, random vibra⁃ tion and impulse excitation are consistent with the trends of amplitude-frequency and phase-frequency curves of measured results in the frequency band of 10 Hz-1 kHz, with a high degree of coincidence, and that in the frequency band of 10 Hz-1 kHz, the identification errors of bearing dynamic load are 0.21-3.5 dB under unbalanced excitation, 2.03-2.53 dB under random vibration excitation and 2.16-4.64 dB under pulse excitation, which proves that the inverse identification method is feasible and accurate. © 2024 China Ship Scientific Research Center. All rights reserved.