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Math Help - Springs

  1. #1
    Junior Member
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    Springs

    Ok so these is no example in my book on how to do this and i missed this day of class. I understand how to get to a general equation of something like this but i don't know how to do the reverse. The problem is:

    The equation of motion of a spring-mass system is given by

    y(t)=e^{-3t}[-2cos(5t)+sin(5t)]

    Determine the corresponding standard damped amplitude-phase lag expression for y(t).

    I can't find that phrase "amplitude-phase lag" any where in my text so i have no idea what he's asking for. Can anyone give a little help? Thanks alot ^.^
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  2. #2
    Super Member Matt Westwood's Avatar
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    Quote Originally Posted by mortalapeman View Post
    Ok so these is no example in my book on how to do this and i missed this day of class. I understand how to get to a general equation of something like this but i don't know how to do the reverse. The problem is:

    The equation of motion of a spring-mass system is given by

    y(t)=e^{-3t}[-2cos(5t)+sin(5t)]

    Determine the corresponding standard damped amplitude-phase lag expression for y(t).

    I can't find that phrase "amplitude-phase lag" any where in my text so i have no idea what he's asking for. Can anyone give a little help? Thanks alot ^.^
    It's a bit over my head, but here's a reference on the web:

    http://ocw.mit.edu/NR/rdonlyres/Math...0FDD/0/c18.pdf

    see how you get on
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