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  1. #1
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    Hey All fisrt post

    Hey all

    this is my first post and i am trying to find a formula (a bit rusty on math since school) i cant seem to track down. I am wondering if someone could provide any help.

    I am looking to measure the rate of decelartion of a wheel, this will be slow but will be non constant.

    so i think that i am looking for the differntail equation for angular acceleration.

    all help would be greatly appreicate
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    Forum Admin topsquark's Avatar
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    Quote Originally Posted by erdnase View Post
    Hey all

    this is my first post and i am trying to find a formula (a bit rusty on math since school) i cant seem to track down. I am wondering if someone could provide any help.

    I am looking to measure the rate of decelartion of a wheel, this will be slow but will be non constant.

    so i think that i am looking for the differntail equation for angular acceleration.

    all help would be greatly appreicate
    You can't do this without data from the wheel and knowledge of what kind of relationship the angular acceleration has with time. Do you have a specific example in mind?

    -Dan
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    hey all

    thanks for the information.

    I have collected sum data and was wonder if you could porvide furhter help with the forumla for find the speed and accelartion of a wheel

    1revoultion 5.4 seconds
    2 rev 5.4
    3 rev 5.5
    4 rev 5.5
    5 rev 5.6

    From this data is it posible to find the rotational speed in seconds and the deccealration.

    is this a standard forumla for this calculation or is dependable on the data collected?

    thanking in advance
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by erdnase View Post
    hey all

    thanks for the information.

    I have collected sum data and was wonder if you could porvide furhter help with the forumla for find the speed and accelartion of a wheel

    1revoultion 5.4 seconds
    2 rev 5.4
    3 rev 5.5
    4 rev 5.5
    5 rev 5.6

    From this data is it posible to find the rotational speed in seconds and the deccealration.

    is this a standard forumla for this calculation or is dependable on the data collected?

    thanking in advance
    Well, you can find an average angular acceleration by noting the beginning and final angular speeds:
    \omega = \omega _0 + \alpha t
    where \alpha is your average. Otherwise you are looking for a technique to do a numerical derivative from your angular speed data. Hope it helps!

    -Dan
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