Analysis Of Structural Vibration And Cabin Noise Prediction Of Rescue Vessels

Ships as the main means of transportation,in the daily transportation and sightseeing tourism play a great role,with the continuous improvement of material living standards,in the cruise ship comfort requirements are also gradually improved,especially for sightseeing cruise ships,the ship in the process of driving,hull structure vibration and cabin noise size,not only affect the physical and mental health and experience of tourists,but also reduce the service life of the hull structure,so the ship before the construction of the hull structure vibration and cabin noise prediction research,The use of simulation software for verification and optimization is effective and feasible,with a certain degree of accuracy.In this thesis,taking the large rescue ship built by the Hainan Maritime Safety Bureau as the research object,according to the basic structure diagram of the hull,a finite element model of the whole ship is established,and the excitation size generated by the propeller,thruster and other equipment carried by the rescue ship is calculated in Abaqus,which is loaded in the corresponding cabin of the equipment,the forced response of the hull structure during the equipment work is calculated,the acceleration and velocity response values of the key positions of different structural compartments on different decks in the superstructure are analyzed,and the response results are checked according to the specifications.The results show that the selected key points meet the requirements of the code and are suitable for crew and rescue personnel.According to the calculation of the natural frequency of this vessel,the natural frequency is calculated by empirical formula method,additional mass method and acoustic-solid interaction method and compared and analyzed,and the center of gravity of the large rescue ship is changed by adjusting the weight of different decks in 7 different schemes,and the influence of the frequency of vertical first order,vertical second order,horizontal first order and horizontal second order with the center of gravity is studied,and relevant conclusions are drawn.In the Vaone software,according to the requirements of statistical energy method,the SEA model of the rescue ship is established,the noise generated by the work of the excitation equipment is solved,the structure-borne noise and air noise of the excitation equipment are set to load the acoustic cavity,base and plate where the excitation equipment is located,and the different cabins on different decks are predicted and analyzed one by one.For the cabin where the predicted noise exceeds the specification,the noise contribution of the cabin is analyzed,the board subsystem with the largest contribution is found,the corresponding acoustic package is designed by using the sound insulation material,sound absorbing material and damping material combined with the location of the cabin,and the vibration and noise reduction optimization is carried out with the use of vibration damping spring,so that the cabin can meet the standard standards and achieve good control effect.At the same time,without considering the current noise generated by the contact between the ship and the current and the cavitation noise caused by the underwater movement of the propeller,the acoustic radiation of the excitation equipment on the rescue ship to the water area where the ship is located was explored,and the influence of structure-borne noise and air noise on the underwater noise was discussed separately.Starting from the livability of the rescue vessel,this thesis uses simulation technology to solve and verify the natural frequency of the ship,analyzes and discusses the vibration response and noise prediction of each cabin,and elaborates the changes of the natural frequency under different centers of weight,aiming to provide a suitable method for the ship design evaluation stage,and provide a certain reference for the vibration response and cabin noise optimization design of the ship.