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Study on Numerical Analysis of the Installation Process of Interference Fit for Keyless Fitting of Marine Propeller

Author: YuChaoZuo
Tutor: FanShiDong; ZhuHanHua
School: Wuhan University of Technology
Course: Vehicle Operation Engineering
Keywords: hydraulic keyless connection interference fit FEA simulation
CLC: U664.33
Type: Master's thesis
Year: 2012
Downloads: 70
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Abstract


The marine propeller is important component of the marine power plant, in the process of ship construction, the quality of propeller alignment is extremely important. It affects the long-term normal operation of the ship and the crew’s lives and security. At present,many large ships adopt hydraulic keyless installation method for fixing the relative position of propellers and hubs. Utilizing hydraulic keyless connection method for propellers installation is not only easy for construction but also enhancing the installating quality,ensuring the security and reliability of propeller operating.53800DWT DOUBLE-SKIN BULK CARRIER is taken as the object of study in the paper.Based on CCS and ABS specifications,the finite element simulation for propeller installation process is carried out by ANSYS,discussing the mechanic behavious of propellers and hubs under different push-up lengths.The results are as follows:1)Described the working principle and advantages of keyless hydraulic connection technology; and the key technologies needed for the installation process.2)Described the mechanic principle of interference fit through material mechanics and theoretical mechanics; calculating hub’s push-up length and interface force according to classification society rules; calculating the radial displacement and force of propellers and hubs based thick-walled cylinder theories; creating finite element model of propellers and hubs.3) Calculating at minimum push-up length:magnitude of interference error is less than1.85%;contact surface press error is less than3.66%;comparing the results of3different ways of alculating torque, the simulation solution is larger than the theoretical solution;the error of hub’s radial stress, circumferential stress and equivalent stress are respectively less than0.05%,0.36%and4.14%.When minimum push-up length is larger, magnitude of interference, contact surface press and hud’s press are also larger.At the edge of the contact area has the stress-focus phenomenon.The maximum value of stress is less than the allowable stress of hub’s material. 4) Calculating at maximum push-up length:according to different classification society’s standard,the contact surface press is less than the allowable stress of hub’s material.The equivalent stress value at maximum push-up length which according to ABS2010’s standard is more than the allowable stress of hub’s material. When the temperature is between0℃and10℃,the equivalent stress damages the hub’s material according to CCS2009’s standard. When the temperature is between10℃and35℃,the equivalent stress doesn’t damage the hub’s material according to CCS2009’s standard. At the edge of the contact area has the stress-focus phenomenon. The maximum value of stress is far more than the allowable stress of hub’s material.5) By comparing the simulation solution and the theoretical solution of contact surface press and hub’s equivalent stress,it determined the location of installation initial point.

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship machinery > Marine propulsion device > Propeller
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