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In order to solve the problem in accurate identification of dynamic load of marine propulsion shafting bearings, this paper proposes a kind of frequency-domain inverse identification method based on inversion 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 vibration 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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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