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| shaft deflection | |||
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| Posted by: vicky612 ® 08/30/2006, 02:12:50 Author Profile eMail author Edit |
I am a student doing my bachelor and currently doing my final year project.It is a bearing test rig where load will be applied on a test bearing which placed on a stepped down shaft.there will be 4 bearings where 2 bearing in the middle will be apllied with load and the other 2 bearings at about 25-30mm from the side of each end of the shaft acts as a support for the shaft.can someone guide me to calculate the shaft deflection and give the formula which required to be used as im worried i will choose the wrong formula and the shaft will deflect too much and fail the test.thank you so much in advance and i looking forward for someone's guide. Modified by Administrator at Fri, Sep 08, 2006, 19:50:59 |
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| Posted by: vicky612 ® 09/01/2006, 11:48:52 Author Profile eMail author Edit |
I have uploaded a sketch of mine.i hope this would be helpful to guide me.please guide to how to calculate the deflection of the shaft.
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| Posted by: Kelly Bramble ® 08/30/2006, 12:10:23 Author Profile eMail author Edit |
A free-body load diagram would be helpfull. |
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| Posted by: Scooter ® 08/30/2006, 11:56:54 Author Profile eMail author Edit |
Where in respect to the horozontial shaft will the load be placed ? Will the load be concentrated ? If not, over what length will the uniformity be ???
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| Posted by: vicky612 ® 08/31/2006, 11:25:04 Author Profile eMail author Edit |
I have sketched and save it in word document.i hope that would give a better idea of the problem.I couldnt upload here as it says have some error,so i uploaded in different website.Please have a look and guide me with appropriate formula and steps of how to find the deflection and how to calculation where to place the bearing so that the deflection of the shaft will be minimum.
Here is the link. #################### thank you for all the reply. Admin: Links to that website are not allowed - please attach file here... Modified by Administrator at Thu, Aug 31, 2006, 11:33:54 |
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| Posted by: zekeman ® 08/31/2006, 12:09:07 Author Profile eMail author Edit |
Administrator,
It would be more helpful if you tell the poster how she can post her sketch. I'm sure this comes up a lot and would be useful to others as well |
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| Posted by: zekeman ® 08/30/2006, 10:20:21 Author Profile eMail author Edit |
The conservative way (giving the largest deflection) is to consider the end bearings simply supported and put a force in the middle. The more accurate way is to split the beam in the center yielding two symmetrical beams with 1/2 load guided at the split end and the opposite end built-in; this will yield a smaller value.
The actual value would be somewhere in between. |
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