The Design and Analysis of Composite Replaceable and Adjustable Pitch Propeller

• Main Authors: JIA RU LI, 李佳儒
• Other Authors: 林輝政
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/66953891522755025506

碩士 === 國立臺灣大學 === 造船及海洋工程學研究所 === 90 === The article is mainly subject to the composite replaceable and adjustable pitch propeller which is made by injection molding method. Concerning the propeller by 2 parts : structure and the convenience of replaceable blade and variable pitch. Most of the propellers are made from metal, they cost more than composite propellers. So if some of the metal propeller changed to be composite propeller are very economic. There are some manufacturers produce replaceable blade composite propellers, but only PROPULSE make the replaceable blade and variable pitch. This is a very interesting topic, worth our study. The propeller we designed first time can’t satisfy our porpulse, the stress on the blade is always higher than ultimate tensile stress, unless on calculation, even tested by boat get the same answer. And the propeller is not convenient to constitute together, and the way to deside pitch is rely on a copper block. When you want to change the pitch, the copper block should be replaced. So it’s really not convenient. For structure , we modify it by 3 ways : (1) make the join part wider (2) make the blade thicker (3) use high strength materials. By calculation, the propeller is safe on any condition. For constitution, we remove the copper block and use screw and sawtooth to fix the blade, and it works perfectly. All the calculation use MIT PSF2 for fluid analysis and ANSYS for structural calculation, we make it convenient for use. Make it easy for other analysis.