한국해양대학교

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저소음 대형 캐비테이션 터널의 임펠러 축계시스템 구조설계에 관한 연구

Title
저소음 대형 캐비테이션 터널의 임펠러 축계시스템 구조설계에 관한 연구
Alternative Title
A Study on the Structural Design of Impeller Shafting System for Low Noise Large Cavitation Tunnel
Author(s)
전동춘
Publication Year
2009
Publisher
한국해양대학교 대학원
URI
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002175748
http://repository.kmou.ac.kr/handle/2014.oak/10035
Abstract
Abstract



This thesis is focused on the comparison between Numerical Calculation and FEM Analysis by ANSYS by software for Impeller Shafting System of Low Noise Large Cavitation Tunnel. The impeller shafting system are considered buoyancy effect to influence driving shaft in the water that reason why the shaft diameter 800mm above. The shafting are arranged two solid shafts at forward end, three hallow shafts in the water and one hallow shaft on the tail. The bearings are arranged one self aligned journal bearing on the tail shaft and one axial thrust with two journal bearings on the motor shaft. The strength calculation was done by MathCAD.



The structural analysis was done by ANSYS. The reaction forces for bearings which are located motor shaft bearing, intermediate shaft bearing and tail shaft bearing are measured by hydraulic jack.

The final results are as follows :



(1) The structural analysis which compared design calculation was much higher values because the software supplier need to reduce risk for the structural damages. Therefore most of softwares are consisted strong boundary conditions for more safety designing.



(2) The actual reaction forces for bearings which compared design calculation values was very much close to calculation data it with the table 3a for comparison data of reaction forces.



Therefore, the design calculation is based on real values for structural designing but the software is focused on the safety designing more than 30% of design calculation and some of critical designing is much higher safety margin to improve risk of structural damages.
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기관시스템공학과 > Thesis
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