Numerical study of the effect of Base Isolated (neoprene) on the dynamic response of the installed module on the FPSO deck


University of Qom


Significant advantages of FPSO in the ability to transfer and extract from offshore wells have led to their widespread applications. Kind of different modules is installed on the top of these platforms, where one of the major engineering concerns is choosing the location of these modules on the FPSO platform deck in order to reduce the effects of environmental forces. Typically, these modules are analyzed and designed based on the maximum linear acceleration extracted from the ship's spectral analysis, using a quasi-static method. The main purpose of this research is the analytical study of these modules response under dynamic excitation due to the wave effect. This research has been done in two parts. First, the dynamic response of different parts of the ship's deck has been analyzed under the effect of wave force and proper location for these modules is recommended. For this purpose, first with modeling and analysis performed in MAXSURF software, the ship's dynamic responses at different points of the deck have been calculated. Then these modules have been analyzed against the deck response considering base isolation at the module bases in the second part. The obtained response has been applied to two modules as a case study in Sap2000 software. The result shows that base shear and displacement have a verity response in the function of base isolation stiffness. Due to the extension of the ship's deck and the serious differences in the acceleration spectrum at different locations of the deck, in order to select the optimal stiffness, the locations of the desired module must also be considered.


  1. Journee, J. M., & Massie, W. (2001). Introduction in offshore hydromechanics (OT3600). TUDelft, Faculty of Marine Technology, Ship Hydromechanics Laboratory, Report No. 1267-K, Lecture Notes.
  2. Kamphuis, J. W. (2010). Introduction to coastal engineering and management (Vol. 30). World Scientific. [DOI:10.1142/7021]
  3. Holthuijsen, L. H. (2010). Waves in oceanic and coastal waters. Cambridge university press.
  4. Newland, D. E. (2012). An introduction to random vibrations, spectral & wavelet analysis. Courier Corporation.
  5. Liu, Z. and P. Frigaard (1999). Generation and Analysis of Random Waves, Aalborg Universitet.
  6. Liu, Z., & Frigaard, P. (2001). Generation and analysis of random waves, cursus. Aalborg University.
  7. Lapidaire, P. J. M., & Leeuw, P. J. (1996, January). The effect of ship motions on FPSO topsides design. In Offshore Technology Conference. Offshore Technology Conference. [DOI:10.4043/8075-MS]
  8. Han, H., Lee, J. H., & Kim, Y. S. (2002, January). Design development of FSRU from LNG carrier and FPSO construction experiences. In Offshore Technology Conference. Offshore Technology Conference. [DOI:10.4043/14098-MS]
  9. Wang, G., & Spong, R. (2003, January). Experience based data for FPSO's structural design. In Offshore Technology Conference. Offshore Technology Conference. [DOI:10.4043/15068-MS]
  10. Chakrabarti, S., Halkyard, J., & Capanoglu, C. (2005). Historical development of offshore structures. In Handbook of offshore engineering Elsevier. [DOI:10.1016/B978-008044381-2.50004-7]
  11. Buchner, B., & Bunnik, T. (2007, January 1). Extreme Wave Effects on Deepwater Floating Structures. Offshore Technology Conference. [DOI:10.4043/18493-MS]
  12. Molland, A.F. (2008), Ship design, construction and operation.
  13. Henriksen, L.O., Wang, X., & Liu, D.J. (2008). Structural Design and Analysis of FPSO Topside Module Supports.
  14. Su, Z., Luo, Y., Qi, X., & Xie, Y. (2014, March 25). FPSOS for Deepwater Applications. Offshore Technology Conference. [DOI:10.4043/24948-MS]
  15. Sayed, M., Watson, D., Islam, S., & Wright, B. (2019, July 15). The Influence of Floe Size and Ice Concentration on Ice Force Levels for an FPSO in Pack Ice. International Society of Offshore and Polar Engineers.
  16. Davis, S., Marsegan, C., & Botwinick, D. (2019, April). Inherent Safety-How to Utilize Explosion Hazard Analyses as an Early Tool to Improve FPSO and FLNG Design. In 2019 Spring Meeting and 15th Global Congress on Process Safety. AIChE
  17. Rivera, L. A., Neves, M. A., Cruz, R. E., & Paulo de Tarso, T. E. (2019). A study on unstable motions of a tension leg platform in close proximity to a large FPSO. In Contemporary Ideas on Ship Stability (pp. 307-321). Springer, Cham. [DOI:10.1007/978-3-030-00516-0_18]
  18. Dezvareh, Reza. "Evaluation of turbulence on the dynamics of monopile offshore wind turbine under the wave and wind excitations." Journal of Applied and Computational Mechanics5, no. 4 (2019): 704-716.