one thing about rhino

Discussion in 'Software' started by pavel915, Feb 2, 2007.

  1. pavel915
    Joined: Nov 2006
    Posts: 349
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    Location: Bangladesh

    pavel915 Senior Member

    I need to find the weight and position of cg of the hull shell plates
    so the wetted surface area and the position of the CG of hull surface will give the result.(wetted surface area*plate thickness will give me the plate volume)
    now. I found that , rhino has a option analyze>massproperties>area and
    analyze>massproperties>area centroid
    will this give me the result I am wanting? I am a bit confused about that.
    please make me clear about it ,,,, by your reply.
    thanks.
     
  2. Raggi_Thor
    Joined: Jan 2004
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    Location: Trondheim, NORWAY

    Raggi_Thor Nav.arch/Designer/Builder

    Don't confuse wetted area with the whole hull.
    For cg of the whole hull you can use the command AreaMoments.
     
  3. Raggi_Thor
    Joined: Jan 2004
    Posts: 2,457
    Likes: 64, Points: 0, Legacy Rep: 711
    Location: Trondheim, NORWAY

    Raggi_Thor Nav.arch/Designer/Builder

    It seems like the AreaCentroid is what you need, you ca select as many surfaces as you want.

    Here is from a small boat:
    Cumulative Area = 6.8288999 (+/- 1e-006) square meters for 5 surfaces
    Cumulative Area Centroid = 2.387977,-3e-016,0.2387679 (+/- 3.6e-006,1.7e-006,5e-007) for 5 surfaces

    This boat has the center of gravity 2.4 meter from the bow (2.387977).
    Your boat (ship) is probably rotated, but you see what I mean.

    Since I wasn't sure how this command works, I made a simple surface, a rectangle with one corner in 0,0,0. If you kow the answer it's easier to fihure out what Rhino calculates.
     
  4. pavel915
    Joined: Nov 2006
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    Location: Bangladesh

    pavel915 Senior Member

    oh;;;;;;;; so this is a very good thing for estimating the many parst of the ship.
    It can help us a lot for weight estimate.
     

  5. Antisthenes
    Joined: Jan 2007
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    Location: Phoenix

    Antisthenes Junior Member

    use v4?
     
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