Design And Research Of Auxiliary Elevator Based On Deep-sea Platform

With the increasing saturation of land resource development and worsening environmental pressure,sea power is becoming more and more important to human activities.At present,the competition of maritime rights is mainly based on the national scientific research level and equipment strength,and the scientific research level also needs the support of equipment strength.To enhance the strength of deep-sea equipment,in addition to the research and development of new deep-sea equipment,it is also an important way to improve the operation capacity of existing deep-sea platforms.This paper designs an auxiliary elevator,which is mainly used to assist the existing deep-sea platform to lift samples and navigate and locate.With the development of deep-sea equipment technology,all units have continuously optimized and upgraded their operation and maintenance of deep-sea platforms and team construction,and the underwater operation duration and operation efficiency of deep-sea platforms have also been significantly improved.The loading capacity of the deep-sea platform’s own sampling bar has become a major factor restricting the deep-sea platform from obtaining seabed samples.Since the design of the sampling column of the deep-sea platform has been determined,it is much simpler to design an auxiliary elevator to expand the sample bearing space than to modify the original platform design.The auxiliary elevator designed in this paper aims to use the simple structure,reliable and mature lander structure to assist the operation of deep-sea platform,and carry out sample lifting and auxiliary navigation,so as to maximize the operation potential of existing deep-sea platform.Based on the specific understanding of the functional composition of the auxiliary elevator,the auxiliary elevator is divided into modules,the involved structure is designed in modules,and the involved instruments are selected.The spatial structure layout and ballast form are designed,and the geometric model is drawn by the Three-dimensional Modeling Software Solidworks.The mechanical properties of the involved main frame and pressure shell are checked through the ANSYS statics module.The strength and buckling mode of the pressure chamber are analyzed,and the equivalent stress of the pressure chamber under the test pressure is determined to be within the allowable stress range of the material（）;The first four buckling safety factors are above 20,far exceeding the buckling criterion of1.5.It is determined that the designed main frame meets the service requirements,and it is concluded that the tensile performance of the main frame is stronger than that of the compression.The motion reference coordinate system of the auxiliary elevator is established,and the stability of the auxiliary elevator is calibrated.The hydrodynamic performance of the designed auxiliary elevator in the diving and floating States is analyzed by using FLUENT software,and the motion equations of the corresponding hydrodynamic parameters and motion states are obtained.Underwater redeployment capability is an important capability to change the landing position of auxiliary elevator and follow the platform.It is mainly divided into four stages:propulsion and ascent,hovering,underwater cruise and re landing.The motion equation and hovering conditions of the propulsion lift are obtained by calculation,and the hydrodynamic performance of the designed auxiliary lift in the cruise phase is analyzed by using FLUENT software.The motion equation of the corresponding hydrodynamic parameters and motion state is obtained by solving,and the stability of the auxiliary lift in the cruise phase is checked.It is calculated that the deflection angle of the auxiliary lift under water resistance in the cruise state is about,It will not affect the underwater stability of the auxiliary elevator.Aiming at the contradiction between the improvement of sampling efficiency of deep-sea platform and the insufficient transmission capacity of deep-sea samples,an auxiliary elevator is designed to assist the deep-sea platform to lift samples.The auxiliary elevator has the ability of underwater redeployment.The overall design and preliminary analysis of relevant auxiliary elevators are carried out,which provides ideas for further optimization.