| In recent years, with the development of China’s fishery on the offshore fishery resources the fishing efforts to increase, making the number of offshore fish dropped sharply, let the fishermen had to go deep-sea fishing to get rich fish, went to the ocean to the transformation of the former fishing boats, which can meet the requirements of performance and more. A performance as the ship hull vibration is important, the harmful vibration of the offshore fishing crew and ship equipment often, because the ocean fishing need after a long voyage, the harmful vibration problems of common concern. In the upper part of the hull of the ship, the local vibration due to the part of the building and other types of the same outstanding. The hull structure designers how to design reasonable in the initial ship superstructure vibration problems can be solved well is a difficult but important research point.First of all, need to calculate the inherent characteristics of the hull. In the article is mainly divided into two kinds of case discussion, taking into account the additional water mass and without considering the factors, the hull itself has the frequency will change. In the study of hull vibration, should pay attention to what is involved in the vibration, to find out the effective quality, including the quality of ship hull itself, equipment and goods, the quality of this part of the attached water. Look at the hull itself quality, it is simulated with the three-dimensional model of the plate element and beam element; the quality of the equipment according to the mass point distribution to the device location; the quality of the goods is in strict accordance with the "hull" calculation analysis, and according to the reality of the location is added to the model to a final report; even the water quality should be calculated according to the formula of "vibration control of ship CCS Standard Guide" are given, and then take the same approach to quality of the mass distribution in the model.Secondly, the local analysis for reducing vibration. In this paper, the main focus of the corresponding transformation of the ship in two parts. One is the main part of hull structure,way is to take additional column in the cabin and the need to increase the quality of the stern. The second is on the base of improved, in this paper, transformation of ideas of this part mainly is from reference. The improved transient response analysis of ship to take, and to study the results, so as to select good damping effect of the scheme. |
