Abstract No.C171106-012

Author name(s): Xuerong SUN, Yong ZHANG, Zhanjun WANG

Company: Offshore Engineering Department, MARIC, China

The hull structural anti-vibration design of Cutter Suction Dredger has many significant challenges of the unconventional vibration sources such as the heavy-lift bridge equipment, cutter head equipment, underwater mud pumps of the heavy-lift bridge, and above water mud pump equipment arranged on the deck or in the cargos. The excitation to the hull structure has become a primary challenge because of the increasing demands in rock dredging, coal cutting, coal mining, hard claying and rapidly increasing power of cutter head. It is particularly large when the cargo’s mud pump and underwater mud pump of the heavy-lift bridge worked in series. Besides, this type of ships has several dredging locating modes such as double-anchor four-cable single-spud locating, both spud locating and three-cable locating etc., and often works in adverse sea condition. This paper studies the global hull structural vibration in operational condition based on FEM method. The result shows it is difficult to give accurate design margins between the global hull structural vibration frequencies and excited frequencies of cutter head, which is caused by uncertain and fluky rocks or clay, and uncertain cutter head powers in dredging operation. It also sets forth the active and inactive vibration pivotal technologic details based on the calculation results and vibration theories.

KEY WORDS: cutter suction dredger; heavy-lift bridge; cutter head; underwater mud pump; FEM method; global hull structural vibration; instantaneous vibration; steady vibration

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