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Smart Structures and Systems
  Volume 24, Number 3, September 2019, pages 403-414
DOI: http://dx.doi.org/10.12989/sss.2019.24.3.403
 


Vibration control for serviceability enhancement of offshore platforms against environmental loadings
Chih-Shiuan Lin, Feifei Liu, Jigang Zhang, Jer-Fu Wang and Chi-Chang Lin

 
Abstract
    Offshore drilling has become a key process for obtaining oil. Offshore platforms have many applications, including oil exploration and production, navigation, ship loading and unloading, and bridge and causeway support. However, vibration problems caused by severe environmental loads, such as ice, wave, wind, and seismic loads, threaten the functionality of platform facilities and the comfort of workers. These concerns may result in piping failures, unsatisfactory equipment reliability, and safety concerns. Therefore, the vibration control of offshore platforms is essential for assuring structural safety, equipment functionality, and human comfort. In this study, an optimal multiple tuned mass damper (MTMD) system was proposed to mitigate the excessive vibration of a three-dimensional offshore platform under ice and earthquake loadings. The MTMD system was designed to control the first few dominant coupled modes. The optimal placement and system parameters of the MTMD are determined based on controlled modal properties. Numerical simulation results show that the proposed MTMD system can effectively reduce the displacement and acceleration responses of the offshore platform, thus improving safety and serviceability. Moreover, this study proposes an optimal design procedure for the MTMD system to determine the optimal location, moving direction, and system parameters of each unit of the tuned mass damper.
 
Key Words
     offshore platform; multiple tuned mass dampers; vibration control; ice load; earthquake engineering
 
Address
Chih-Shiuan Lin: National Rail Transit Electrification and Automation Engineering Technology Research Center,
The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;
Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY, USA
Feifei Liu and Jigang Zhang:School of Civil Engineering, Qingdao University of Technology, Qingdao, Shandong, China
Jer-Fu Wang: Department of Civil and Disaster Prevention Engineering, National United University, Miaoli, Taiwan
Chi-Chang Lin: Department of Construction Engineering, Chaoyang University of Technology, Taichung, Taiwan;
Department of Civil Engineering, National Chung Hsing University, Taichung, Taiwan

 

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