Research and design of drop keel system for multi-purpose oceanographic vessel

Abstract

When an oceanographic vessel is sailing, the currents near the surface of ship hull are rapid, making it hard to meet the environmental requirements of scientific observation equipment. To guarantee the installation space and environmental requirements of the observation equipment, the drop keel system was proposed for the first time for ocean-graphic ships at China, to avoid the traditional “rudder-shaft” type fin keel’s disadvantage. The research study will examine the operational mechanism and functions of the drop keel system, the operating conditions of the fin keel to determine the driver method and its arrangement, and the locking method of the fin keel underwater. The research will also provide some general designs for analyzing the best plan for the drop keel system.

Keywords

drop keel / oceanographic vessel / hydraulic analysis / mechanism design calculation / hydraulic-electronic control system

References

[1] An XF (2008). Research on innovation design method of mechanical product based on TRIZ. Master’s thesis, Tianjin University, 3–5. (in Chinese)

[2] CCS (2007). Rules for lifting appliance of ships and offshore installations. 22–23. (in Chinese)

[3] CCS (2009). Rules for classification of sea-going steel ships(Part 1). 6–7. (in Chinese)

[4] Chinabgao (2009). Forecast study of deep research and investment for Chinese ocean-graphic vessels from 2010 to 2015. [2010.7.20]. http://www.chinabgao.com/reports/108700.html.

[5] Chu T.A. Bolt tightening methods and preload control. Process Equipment & Piping, 2005, 42(3): 8-10

[6] Cone CD (2009). ST-369 — RV “G. O. Sars” (2003). [2010.7.20]. http://www.skipsteknisk.no/default.asp?menu=35&product=20.

[7] Huang B.L., Song X.H. Analysing hydraulic cylinder systems on lifter frameworks. Coal Mine Machinery, 2003, 6: 36-38

[8] Mei Q.S. Marine rudder, 1981, Beijing: China Communications Press, 60-80

[9] Su J.L., Wang P.X. Two proposals on improving our marine scientific research. Bulletin of the Chinese Academy of Science, 1995, 10(1): 62-63

[10] Wang L.W., Zhou R.P., Gao H. Study on the structure design and calculation of large marine stern roll. Ship Engineering, 2010, 32(5): 10-14

[11] Wu JP, Hu Y, Chen SH (2007). Numerical calculation of the hydrodynamic force on rudder. The 5th International Workshop on Ship Hydrodynamics, Zhenjiang, China, 92–96.

[12] Wu Y.D. Static hydraulic transmission device. Hydraulics Pnenmatics & Seals, 2002, 4: 46-48

[13] Yanagizawa M, Kikuchi K (1982). Finite element calculations for aerodynamic coefficients of 3-dimensional body in subsonic flow using Green’s function method. Technical Report of Japan National Aerospace Laboratory, 3–22.

[14] Zhang X.M., Li Y.J. Study on principle of marine flexble fish-like mechanism and hydrodynamic experiment of single fin. The Ocean Engineering, 2002, 20(1): 84-90

[15] Zhu XG (2005). Research and development of 45 ton hydrostatic winch. Master’s thesis, Tianjin University, 45–60.