Finite Element Analysis Of The Seal Performance Of Controllable Pitch Propeller

High performance marine dynamic orientation equipment is the core equipment to maintain high-precision dynamic positioning and smooth operation of offshore platforms,and the high-power full-rotary thruster is the bottleneck restricting China's independent R&D and manufacturing.The controllable pitch propeller of the full-rotary thruster is subjected to strong alternating external load,and the sealing failure is one of the main failure modes.Studying the dynamic change law and maintaining mechanism of sealing performance is very important for improving the life of the whole machine and the reliability of the equipment.The propeller hub of the controllable pitch propeller is sealed with O-type rubber ring.Under the pretensions and different working conditions,the compression rate and contact pressure directly affect the wear state and the sensitivity of pitch adjustment.By calculating and analyzing the complex conditions in the service process of the South China Sea,the finite element model of the hub's movement pair was established in the ANSYS Workbench.The variations of assembly clearance and friction stress during different preloads,temperatures,centrifugal forces,and pitch angels were simulated and analyzed.Based on this study,along with the gaps caused by frictional wear and assembly tolerances,this paper analyzed the Oring seal state under different compression rates and different oil pressures,and predicted the wear laws and failure modes according to the sealing mechanism.At last,the sensitivity analysis of different service parameters was carried out,the importance of temperature control device was emphasized,and the optimal preload is obtained by optimizing the response surface of the assembly preload,which effectively reduces the assembly gap caused by preload.The finite element analysis of the hub seal structure provides the data basis for the design optimization and service life calculation of the controllable pitch propeller,which has important reference value for the improvement of the seal structure.