The Effect of the Friction Force on the Bearing with a Rotating Shaft
碩士 === 國立宜蘭大學 === 機械與機電工程學系碩士班 === 100 === Abstract The dynamic analysis of a rotating shaft is well studied in the past. Most of the studies are focused on the problem of the reaction forces of the shaft. It is rare to study the reaction force of the bearing with a rotating shaft. Because it is d...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2012
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| Online Access: | http://ndltd.ncl.edu.tw/handle/35135313266863013014 |
| Summary: | 碩士 === 國立宜蘭大學 === 機械與機電工程學系碩士班 === 100 === Abstract
The dynamic analysis of a rotating shaft is well studied in the past. Most of the studies are focused on the problem of the reaction forces of the shaft. It is rare to study the reaction force of the bearing with a rotating shaft. Because it is difficult to know the maximum stress between the bearing and the shaft. In this research, we use the photoelastic stress analysis method to understand the distribution of the stress on the bearing. And we take the colorful photo imaged by digital single-lens reflex camera.
We try to use mechanics to analyze the effect of the friction force on the bearing. The bearing is assumed to be the plate on that the shaft is rotated. There is a very complicated relationship between the bearing and the rotating shaft. Therefore we try to use ANSYS to analyze this case.
It is clear that the stress distribution is symmetric in the ANSYS by the vertical force on the edge. The result in ANSYS is the same as the mechanics. After verified by the experiment, we make the shaft rotate to generate the friction force that produces the shear force. The result of the stress distribution is also the same as the mechanics. The shear stress generated by friction force breaks the symmetric distribution generated for normal stress. Afterwards, we try to change the coefficient of friction. Then we found that the maximum stress would not be changed a lot from frictionless to 0.2. And the maximum stress grows up significantly while the friction coefficient is upper above 0.2.
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