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Calculating Impact Force and oil well tree

  1. Feb 11, 2008 #1
    I was wondering if anybody could help me. I need to calculate the impact force exerted on an rov if it collides with a oil well tree. The imformation I have are the mass of the rov = 500 kg, initial velocity othe rov is 1.5 m/s and the oil well tree is a fixed body. Im unsure how to calculate the final velocity of the rov ( do I assume this to be 0?) and on how to calculate the duration of the impact.
     
  2. jcsd
  3. Feb 12, 2008 #2

    stewartcs

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    Science Advisor

    You are looking for the Impulse of the ROV on the tree, so you'll have to estimate how long the contact time is. Mathematically stated...

    [tex] J = \frac{mv}{t} [/tex]

    where,

    J = the impulse or impact force
    m = the mass of the ROV
    v = the velocity of the ROV
    t = the time of contact between the ROV and the tree

    A typical estimate for the time of contact would be [tex] \frac{A}{v} [/tex]

    where,

    A = the area of contact

    Make sure your units are correct.

    CS
     
  4. Feb 12, 2008 #3

    minger

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    We often cannot get these theoretical values. A couple of years ago, I had a problem where I was to determine if a pipe fell onto a platform, if the platform would break. Obviously this was not something we could test, and I looked all over to try to get something that would help. My boss gave me a couple of copied pages from a 1940 textbook, that looked handwritten, that gave:

    Perhaps you could use something like this.
     
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