Analysis Of Hull Structure Strength And Vibration Performance On 40m Level Maritime Patrol Ship

Pearl River Basin,with a great many rivers,has convenient waterway transportation and a superior condition of inland waterway transport. Especially in recent years,while the shipping industry of Pearl River Basin becomes increasingly prosperousour, the channel maritime supervision is also facing new challenges as our country constantly strengthen the construction of inland waterway. Currently, most of the maritime patrol ships which are sailing in Pearl River Basin have reached the service life, low tonnage and speed cannot fully meet the requirements of current sailing. Accordingly,there is a pressing need to a new type of maritime patrol ship in order to ensure the normal navigation of Pearl River Basin, The 40m level maritime patrol ship is sudied in this paper which is the new type maritime patrol ship designed for Guangxi Maritime Bureau. Since the ship was in the design stage, in order to be able to check the structural strength of the hull more detailed and precise, the finite element method is used to analys the strength in this paper. At the same time in order to achieve the high speed continuous cruising requirements, the design of power of the host and high speed propeller is adopted. The vibration performance prediction is also should be taken to ensure the normal operation of the ship’s personnel and equipment.This article take advantage of finite element software ANSYS to proofread the longitudinal strength in different working conditions of this ship. Analysis shows that the stress of all the major components is much lower than the corresponding regulatory requirements and the hull deformation is not large in each conditions and the hull stiffness can be guaranteed. On the basis of the above result, thecritical buckling safety factors of the longitudinal main components of the hull are obtained by finite element analysis of the buckling strength of the ship,and the results meet the corresponding requirement specification. Ship’s natural frequency and natural vibration mode are gotten by finite element analysis. To verify the veracity of the results, the results gotten by the finite element method are compared with the result gotten by the empirical formula. Comparing with the main excitation frequency of the ship, we get the conclusion that the results meet the frequency reserve requirements, and the ship resonance phenomenon will not occur. Then ship’s forced vibration response is analyzed ulteriorly, the results show that the vibration performance is good, and severe vibration phenomenon will not occur. Finally, considering the cost of construction, the plate thickness optimization is carried out for the large margin of the ship’s hull structure strength. By finite element analysing the optimized model the conclusion that the thickness has little impact on hull structural strength and vibration performance can be got, within the acceptable range. As a result, the thickness optimization is a effective way to save construction cost.