Dynamic Analysis of a Bolted Joint Dual-Rotor System With an Unbalanced Offset Disk Included in the Low-Pressure Rotor
The dual-rotor structure was usually adopted in aeroengine for the sake of higher efficiency, where the high-pressure (HP) rotor and the low-pressure (LP) rotor are coupled together through an intershaft bearing. For the convenience of manufacturing and maintenance, the bolt connections are widely a...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/vib/4046202 |
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| Summary: | The dual-rotor structure was usually adopted in aeroengine for the sake of higher efficiency, where the high-pressure (HP) rotor and the low-pressure (LP) rotor are coupled together through an intershaft bearing. For the convenience of manufacturing and maintenance, the bolt connections are widely adopted in high-power rotors to fasten together multiple parts that are manufactured separately. The mechanical properties of the bolt connections significantly affect the rotor dynamics, which need to be precisely controlled in the design. Vibration transmission through intershaft bearings leads to complex dynamic behaviors of the bolt connection dual-rotor system, which are more difficult to control the mechanical behavior of the bolt connection. This study established the motion equations of a dual-rotor system with bolt connection structure in the HP rotor using the finite element method to deal with the effect mechanism of vibration transmission from the LP rotor on nonlinear dynamic responses of the HP rotor and the mechanical properties of the bolt connection. The Newmark method was adopted to solve the motion equations, the complicated vibration responses of the HP rotor and the mechanical properties of the bolt connection influenced by different offset positions and unbalanced force of the disk in the LP rotor are analyzed by the cascade spectrums, frequency–amplitude diagrams, time-domain waveforms, shaft obits, and bending stiffness diagram of the bolt connection. The results show that the unbalanced offset disk in the LP rotor significantly affects the HP rotor’s dynamic response and the bending stiffness of the bolt connection. Finally, the numerical simulation results are verified based on a bolt connection dual-rotor system test rig. The investigation is helpful for the dynamic modeling and simulation of the bolt connection dual-rotor system, which can be used to predict the dynamic characteristics during the design process. |
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| ISSN: | 1875-9203 |