The Optimization Design Of Underwater Glider Pressure Hull Based On Ocean Parameters

Underwater glider is a new underwater monitoring instrumental platform, whichimplements its up-and-down movement by adjusting its own buoyancy and realizes itsgliding movement through the wings on both sides of hull, therefore it has thecharacteristics of low energy consumption and big voyage.Due to other causes, theloss of buoyancy regulation is bound to affect the buoyancy adjusting ability of thewhole system, so it can’t accurately control the motion of the glider.The densityincrease of sea water in the vertical direction will lead to buoyancy increase, and hullcompression deformation caused by water pressure can lead to buoyancydecrease,therefore,under the conditions of meeting the operation requirements,throughthe optimized design of the hull,controlling the hull deformation,and making thedifference between the buoyancy increase resulted by density of sea water andbuoyancy decrease caused by the compression deformation to the zero,has a vitalsignificance to improve the control precision and increase voyage of the glider.In thispaper, the main research contents and contributions are as follows:(1) This article first carries on the preliminary design about the structure of theglider;Based on the idea of engineering,it designs the reinforcement ring throughfinite element method,and makes it can satisfy the intensity condition,stabilitycondition and the condition of minimum moment of inertia;Considering the corrosioneffect of the water, it designs the thickness of pressure hull based on the reliabilitydesign method,and makes the reliability of the strength condition,stabilitycondition,fatigue strength and corrosion conditions greater than99.97%, so itprovides a optimization design model for the optimization design and providesexemplary role for the design of glider pressure hull.(2) Structure of pressure hull and the reinforcement ring are simplifiedreasonably under the condition of keeping the stress,strain basically remainunchanged,so that the pressure hull structure is consistent with the theoreticalcalculation model,and the reinforcement ring which has lightening holes and whosecross sectional area is unable to calculate is reduced to the strengthening rib whosecross sectional area is consistent;Calculation formula of static buoyancy isdeduced;The constraint conditions of the pressure hull is simply introduced;Usingeigenvalue buckling analysis,the relationship between the initial defect and the carrying capacity of the hull is analyzed;Through the secondary development on theplatform of workbench,using the Commands command,setting the appropriate volumevariation as export parameters, provides a simple and efficient design method for theoptimization of pressure hull.(3) Selecting nine parameters related to the appropriate volume variation,therelationship between the nine parameters and appropriate volume variation isanalyzed and obtains its relation curve by the theoretical calculation and finiteelement analysis;Taking aluminum alloy7075T6, titanium alloyTA2and carbon fibermaterial T300/5028for example,based on goal driven optimization,setting appropriatevolume variation as objective function,seeing strength condition and stabilitycondition as constraint conditions, optimizes the structure of the hull, the amount ofappropriate volume variation falls by15.88%,20.17%and10%respectively, it hasthe vital significance to improve the performance of the glider...