| Topic: |
Science > Physics |
| User: |
"raam" |
| Date: |
29 Apr 2006 04:20:01 AM |
| Object: |
cross posting - finding average deviation |
hi all,
I have a problem for which i could not find the solution for a long
time.I am having a circular disk which is not planar.It is having ups
and downs in its surface.I have to find out the average up/down of the
disk with respect to a point on it.I have been searching for a
solution for this.As I am poor in analysis I require a lot of help.
Thanks in advance.
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| User: "tadchem" |
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| Title: Re: cross posting - finding average deviation |
29 Apr 2006 08:34:11 AM |
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Didn't you learn anything from your earlier posts?
You can't get help with a solution if you aren't going to be
forthcoming about the problem.
*EXACTLY* what is your problem?
Are you fixing a flat on your toy car or terraforming Flatland?
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| User: "raam" |
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| Title: Re: cross posting - finding average deviation |
30 Apr 2006 03:51:53 AM |
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I am trying to find the runout of a tyre using computer.I am going to
do this as a project.I want to findthe equation which I could apply to
find the runout.I found a sensor which will give output corresponding
to ups and downs in a tyre.As I am not so goood in maths/physics I
request your help.I request you to give some idea about how to
proceed.
I am using so many "i"s , sorry.
Thanks in advance.
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| User: "tadchem" |
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| Title: Re: cross posting - finding average deviation |
30 Apr 2006 05:17:05 AM |
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raam wrote:
I am trying to find the runout of a tyre using computer.
As in definition [1] here:
http://100megsfree4.com/dictionary/car-dicr.htm#Runout ?
I am going to
do this as a project.I want to findthe equation which I could apply to
find the runout.
Runout could be due to simple warping of the tire (American spelling)
in which case I would expect the deviation D to be simple and periodic:
D = D(max) * sin(2*pi*N*A)
where D(max) is the maximum deviation from the average, N is the number
of times the tire deviates to a specific side during one rotation, and
A is the angle through which the tire has been rotated. This will give
you a pure 'wobble'. YMMV
Runout could also be due to a defective tire/wheel. Since defects are
highly variable, they would be difficult to predict with a simple
equation.
I found a sensor which will give output corresponding
to ups and downs in a tyre.As I am not so goood in maths/physics I
request your help.I request you to give some idea about how to
proceed.
The sensor will probably give you more 'realistic' results. What you
will probably find
(after you fit your data to a sine curve and graph everything) is a
combination: a pure 'wobble' and some irregular 'wiggle.' The wobble
will likely be the largest effect.
I am using so many "i"s , sorry.
It is to be expected when you are asked about what *you* are trying to
do.
Thanks in advance.
HTH
Tom Davidson
Richmond, VA
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| User: "raam" |
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| Title: Re: cross posting - finding average deviation |
30 Apr 2006 11:47:06 PM |
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sir,
Thanks a lot.It will be very much useful.If you do not mind could you
please recommend any sudy material on the web o any book which will
give more theoretical explanation .Thanks a lot sir.
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| User: "tadchem" |
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| Title: Re: cross posting - finding average deviation |
01 May 2006 04:15:06 PM |
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Google "wheel alignment" and you will find 1M+ hits, including
http://www.wheels-inmotion.co.uk/index.htm
<Advanced Google "wheel alignment" and theory and runout cuts that down
to about 500 hits - a more perusable selection.>
Tom Davidson
Richmond, VA
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