Research On Comfort Of Jacket Platform

With the development of ocean engineering, the design and construction of offshore platform is more and more aroused people’s concern. With the frequency of people on the offshore platform is more and more high, the marine structures must satisfy the design requirements and standards, and we should pay more attention to human comfort on the offshore platform. The noise and vibration which are produced by the equipments on the platform impact on human comfort. In order to meet the design requirements and standards, we must analyze the noise level of the platform, including the all area of the platform. Now noise analysis has been an essential content, so as to ensure the safety of the human on the platform. Therefore, the analysis of living comfort research on marine structures is very important.In this paper, the research is based on a jacket platform. Platform under complex sea condition, usually are motivated by the external motivation and its equipment. The research is carried out in these aspects:(1) Using software to build up the finite element model of the platform, and using the boundary element algorithm to conclude the low-frequency noise radiation in open area, finally using acoustic modeling software to carry out the entity modeling of the platform. Combined with the above three methods, we can solve full frequency noise level of the platform and cabins.(2) The calculation and research of vibration and sound response which is caused by the equipments.(3) The calculation and research of the pipe noise at target platform.(4) The research of vibration and sound reduction. The research is described in detailed as follow:Firstly, using software to build up the finite element model of the platform, and using the boundary element algorithm to conclude the low-frequency noise radiation in open area, finally using acoustic modeling software to carry out the entity modeling of the platform. Combined with the above three methods, we can solve full frequency noise level of the platform and cabins.Secondly, applying the vibration and acoustic loads on the target platform. Combined with the finite element method, the boundary element method and statistical energy analysis methods to calculate and analyze the noise levels of the target platform in full frequency. Comparing the results with the noise criterion rules to study the impact on human comfort.Thirdly, building up the basic model of the pipe, this paper introduces the transmission mechanism of pipe noise, and the LMS Virual. Lab calculation of flow noise caused by process, using CFX+LMS Virual lab to analyze the flow noise in the pipe: under different speed, the pipe exit flow noise and ventilation flow relationship; under the same velocity, the effect of right-angle and rounded corners bend to the flow noise.Finally, vibration and sound reduction measures of platforms are introduced.Equipments on jacket platforms are variable and high-power. Vibration equipment radiate noise when it works. Large excitation forces can cause serious vibration and sound problems. In order to ensure the comfort of the offshore platform human, we need to take the necessary measures to the target platform for vibration and noise reduction processing.