Journal
JOURNAL OF MARINE SCIENCE AND ENGINEERING
Volume 10, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/jmse10101555
Keywords
marine propulsion shafting; longitudinal vibration; friction damper; thrust bearing; test rig; parameter identification; nonlinear system
Categories
Funding
- National Natural Science Foundation of China [51479078, 52101354]
- Huazhong University of Science and Technology funds the APC
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Propeller-induced longitudinal vibration resonance in marine propulsion shafting systems is harmful to the hull structure and a major source of shipboard noise. Integrating a friction damper with thrust bearings can effectively control the transmission of longitudinal vibration. Experimental and theoretical studies confirm the effectiveness of the damper-integrated thrust bearing in suppressing shafting vibration response.
Propeller-induced longitudinal vibration resonance in marine propulsion shafting systems causes great harm to the hull structure and is the primary source of shipboard noise. Integrating a friction damper with designed parameters into thrust bearings can prevent these issues. To investigate the performance of the damper-integrated thrust bearing in longitudinal vibration transmission control, an experimental and theoretical study is carried out in a laboratory-assembled test rig, which consists of components similar to the existing marine propulsion system. We developed a prototype of a thrust bearing designed with a friction-damping generation that allows switching from two supporting states, i.e., damper-connected and damper-disconnected states. Furthermore, a nonlinear analysis method for friction dampers is proposed. By this method, the way in which the friction damper changes the dynamic characteristics of the shafting system is analyzed. Based on the test rig, the acceleration frequency response function (AFRF) of the thrust bearing with and without a friction damper is measured. By comparison, the effectiveness of the friction damper is proved. The experimental results show that the friction damper suppresses the shafting longitudinal vibration response in a broadband frequency range and also confirms the stability of the damping effect, which does not change with the shafting rotational speed or static thrust from the propeller.
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