Abstract
Abstract With the increasing scale, complexity and diversity of supporting equipment of offshore platform, the low-frequency vibration of equipment such as dynamic positioning system and the main engine is difficult to attenuate in the propagation process of the platform structure, which causes a local resonance of platform, aggravates the fatigue damage of structure and causes discomfort to the human body. Dynamic vibration absorption is widely used in the low-frequency vibration control of offshore platforms; however, there is little research about the multiline spectrum vibration control method in the local resonance region of platforms. In the current research, we first take the stiffened plate under multipoint excitation as the research object, and the effectiveness of the optimal homology design method of dynamic vibration absorption is verified. Subsequently, the low-frequency multiline spectrum vibration control method about the local resonance region of the offshore platform is proposed. Finally, a large offshore platform is chosen as the research object and the measured load of the main engine is taken as the input to calculate the vibration response of the platform. The effect of distributed dynamic vibration absorption of the resonance area verifies the effectiveness of the vibration control method presented in the article and provides a basis for the engineering application.
Highlights
In the background of global economic development, offshore platform plays an increasingly important role in the exploration and exploitation of offshore oil and gas resources
Jin et al [37] studied the influence of tuned liquid damper (TLD) on the vibration response of the platform under seismic waves, and the corresponding numerical analysis was conducted through the lumped mass method and compared with the model test results subsequently
Whereas most research is limited to single-order global vibration of offshore platforms, a few studies have been conducted on the vibration control of local resonance region and low-frequency multiline spectrum dynamic vibration absorption of offshore platforms
Summary
In the background of global economic development, offshore platform plays an increasingly important role in the exploration and exploitation of offshore oil and gas resources. At present, tuned liquid damper (TLD) [29,30] and TMD [28,31,32,33,34] are the two main dynamic vibration absorption forms used in offshore platforms. Jin et al [37] studied the influence of TLD on the vibration response of the platform under seismic waves, and the corresponding numerical analysis was conducted through the lumped mass method and compared with the model test results subsequently. Whereas most research is limited to single-order global vibration of offshore platforms, a few studies have been conducted on the vibration control of local resonance region and low-frequency multiline spectrum dynamic vibration absorption of offshore platforms. The effectiveness of the current method is verified by the calculation of a largescale offshore platform, which lays the foundation for engineering applications
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