Conceptual Design And Hydrodynamic Performance Research And Analysis Of New Life-saving Devices

At present,the ocean circumstance of changeable vulnerable to disaster accident,ship as an important means of transportation,maritime transport need to form a complete set of life-saving equipment on the ship is a very important thing,life-saving equipment of flexible at sea accidents from ships in distress on ships crew quick accurate evacuation and rescue crew plays an important role in life.Due to the poor maneuverability,limited navigation area and environment of traditional life-saving equipment,the rescue work after shipwreck cannot be carried out accurately and quickly.At the same time,because of the harsh environment at sea,people in distress will face some unexpected situations while waiting for rescue,which will cause more casualties.On account of the rescue efforts failed to expand,the number of victims in sea accidents rose sharply,so the new life-saving equipment is imminent,this article aims to the development of a new protective device,can improve the efficiency of rescue distress personnel life safety and security,has certain scientific research significance and practical value in engineering.In this thesis,on the basis of the traditional concept of life buoy and ship,to carry out the new life-saving equipment design,the concept of new protective device as the research object,with the design for new life saving device in static water,regular wave and irregular wave resistance characteristics,to study the flow field characteristics and motion response,compared calculation results,the new configuration improvements life-saving device,The hydrodynamic analysis of the improved new life-saving device is carried out,and the influence of the parameters on the performance of the new life-saving device is also studied.The main research work of this thesis is as follows:(1)On the basis of the concept of traditional lifebuoy and ship,the concept of multi-hull ship is combined with the shape of traditional lifebuoy to meet the use requirements of life-saving devices and various technical design objectives.The conceptual design of new life-saving devices is carried out and the conceptual design scheme of two new life-saving devices is proposed.(2)Taking the designed new life-saving device as the research object,CFD numerical calculation method was adopted to study the hydrodynamic performance of the new life-saving device,and the resistance performance,flow field characteristics and motion response of the new life-saving device under different design conditions were obtained.The resistance characteristics,flow field characteristics and motion response of the new life-saving device in still water,regular waves and irregular waves were studied.By comparing the hydrodynamic performance of the two types of different new life-saving devices,the advantages and disadvantages of the two types of new life-saving devices in configuration are obtained.The results show that: In terms of resistance and motion response,the profile configuration of the new integral life-saving device is better than that of the new three-body fork life-saving device.However,from the point of view of the surface pressure distribution of the device,the new integral life-saving device is prone to burying the head,while the new three-body fork life-saving device is not.(3)The new life-saving device was improved in configuration,and the hydrodynamic performance of the improved U-shaped life-saving device was studied.Meanwhile,the hydrodynamic performance of the improved U-shaped life-saving device was compared with that of the previous two new life-saving devices.The results show that the hydrodynamic performance of the new U-type life-saving device is better than that of the previous two new life-saving devices,which verifies the reliability of the improved configuration of the new life-saving device.(4)On the basis of the research on the three types of new life-saving devices,considering the influence of the shape of the connecting bridge on the performance of the new life-saving device,the influence of the width and height of the connecting bridge on the hydrodynamic performance of the U-type new life-saving device is studied.The results show that: In scheme 3(height is 0.0915m),the hydrodynamic performance of the new life-saving device is better.In scheme 1(width is 0.29403m),the performance of the new life-saving device is better.In terms of the surface pressure distribution,When scheme 2(width is 0.31903m),the performance of the new life-saving device is better.The influence of bridge with different width and length on the performance of the new life-saving device is analyzed,and the optimal size is obtained,which provides data support for the subsequent design of the new life-saving device.