Research On The Noise Prediction And Control For Drilling Tender Barge

With the industrial equipment related to offshore oil upgraded,the international standards about the life and working environment of the crew are stricter.To guarantee the smooth progress of the maritime operations,it is needed to solve the noise problems caused by the tender barges which served the drilling platform.Simultaneously,it will reduce construction costs greatly to make noise forecasts and take precautionary measures in the early stages.Based on the operating feature of the drilling tender barge,this paper uses the Statistical Energy Analysis(SEA)method to measure the noise level of a multi-functional drilling tender barge with an acoustic analysis software-VA One,then related control research is implemented further.The main contents are as follows:(1)Establish the SEA model and calculate the related parameters such as modal number;internal loss factor;input power.(2)Calculate the noise level of the cabins regardless of any outfitting and summarize cabins whose noise levels exceed relevant specifications.(3)The main noise generating effects of the structure and air is considered,combining the forecasted results.Different noise reduction schemes are implemented,based on the different noise type that made great impact on various cabins.The sound pressure level of cabins meet the requirements of the specifications concerned,through adopting noise reduction of using spring isolation and acoustic hood to the generator.(4)Make further noise component analysis for cabin whose noise level just satisfies the specifications and apply various noise treatments.It is found that using damping structure for that cabin could achieve a better effect.Then it is discussed that the influence of the thickness and storage modulus of free damping materials;the thickness of constrained damping structure;the thickness and the storage modulus of the intermediate damping layer on the noise of the cabin taking a different damping structure noise treatment.A more economical and effective noise treatment is obtained by comparing of all these treatments,which has certain practical significance to engineering practice.