Study On Motion Characteristics And Resistance Of General Mobile Buoy

Buoy is a common observation platform for researchers to collect ocean hydrological data and detect underwater targets.The buoy carries different observation systems and communication systems to achieve different observation tasks.Reasonable and excellent buoy configuration can optimize the stability of the carrier,improve the adaptability of the buoy to harsh sea conditions,and improve the accuracy of data measurement.In order to make the buoy intermal system run steadily in a mild extermal environment,the motion range,attitude and force state of the buoy carrier should be controlled within a certain range.Therefore,it is important to optimize the buoy configuration and improve the hydrodynamic stability of the carrier for the stable operation of the buoy intermal systems.Based on the motorized sonobuoy,a general mobile buoy is proposed in this paper.This new type buoy has no mooring equipment and uses dynamic positioning to solve the tedious and time-consuming problems of buoy placement and recovery.In this paper,firstly,the hydrodynamic performance of the new buoy and its force in waves are analyzed.The hydrodynamic performance of the buoy is calculated and analyzed by using theory calculation method and AQWA software simulation method.The first-order wave force,second-order wave force and amplitude RAO curves of motion response of the buoy in frequency domain are obtained.In order to improve the poor hydrodynamic stability of buoy,the influence of stabilizer wing and principal scale on buoy motion response is firstly analyzed,and the influence of different installation positions of stabilizer wing on buoy heave motion is studied.At the same time,the change of buoy motion response under different lengths,widths and draft conditions is analyzed,which provides a basis for further optimization and improvement of buoy.At the same time,drawing lessons from multi-column structure and variable cross-section design,this paper puts forward different design ideas for the shape of the bow and sten structure of buoys.Firstly,the bow is designed as multi-column structure,and the motion responses of multi-column buoys and original buoys are compared under the same drainage.Then,connecting rods are added between the bow and the stem,and different length design schemes of connecting rods are calculated by AQWA software.Differences in hydrodynamic stability of buoys.Finally,the resistance of the buoy at different speeds is calculated,and the endurance of the buoy is studied.In order to analyze the hydrodynamic performance of buoys in irregular waves,the hydrodynamic performance of buoys under given sea conditions is calculated.Based on the analysis of the statistical information of waves in the working sea area of buoys,12 calculation conditions are proposed.Meaningful values and maximum values of buoy motion response under 12 sea conditions are calculated and analyzed,which can provide reference for buoy deployment in different areas of sea area.Referring to the influence of speed on ship heave and pitch motion,the influence of speed on buoy platform is analyzed,and the motion response of buoy at different speed is studied.There is little research on the design and research of mobile buoys at home and abroad.In this paper,by studying the influence of different factors on the hydrodynamic performance of general mobile buoys,which provides technical reference for the optimization design of such new buoys,and has guiding significance and reference value for other buoy design optimization.