Research On The Adaptability Of Crane Barges To The South China Sea

With the development of marine engineering and the decreasing exploration of maritime resources, the demand of large equipments in the sea is more and more higher. Crane barges, as a main marine engineering construction, can be used to loading and unloading of ship, shipbuilding industry, installation of offshore oil platform, marine transportation, rescue under wanter and so on, which show that they are the necessary tools for ocean development. But with the increase lifting capacity, the crane stability in allowed operation ocean condition also put forward higher request. This topic contacts the engineering practice and reaseaches on the adaptive ocean condition of crane so as to ensure the safety condition of the operation.According to the issue above, the model of crane barge is built in the Three Dimension Diffraction Theory and by the software MOSES. Then stability, longitudinal strength and motion amplitude in different heading angles in load draft are calculated and analyzed. Firstly, according to Weibull distribution with two parameters, the sea statistical conditions are processing and obtain the regular pattern of sea parameters. Secondly, the crane stability in the navigation, the motion and wave load in regular waves are estimated and calculated. Thirdly, the calculation of motion in irregular wave of operation and standby state in specific sea environment throughout the year, is compared with the force and motion criteria. Then the allowed marine environment conditions of crane are determined. Finally, the operation and standby probability of crane in special location are determined by the monthly sea statistics, which can judge the adaptability to the sea condition. The analysis menthod and conclusions in the paper are applicable and value to the practical research on the lifting operations of the same kind ships in coastal area.