Freeship/Hydronship Shaft Inboard/Outboard Turn Calcs Request

Discussion in 'Software' started by CmbtntDzgnr, Sep 23, 2011.

  1. CmbtntDzgnr
    Joined: Jun 2011
    Posts: 119
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    Location: somewhereonearth

    CmbtntDzgnr Senior Member

    Hi Victor,

    Is it feasible or worthwhile to create a module for estimating/predicting propulsuion powers/forces/resistance calcs for inboard-turning shafts vs outboard turning shafts?

    I read a SNAME paper from around 1992 discussing the early DD-963 problem of imbalanced gas turbines, or about them not keeping the same commanded RPMs/shaft speed when making turns, losing headway, heaving or pitching too much, and so on. A graph showed that in certain turns, an inboard shaft may experience different amounts of torque than the outboard shaft, depending on whether the shafts are inboard or outboard.

    This prompted me to ask you if it it would useful feature to have an ability to estimate for such plant configurations. I imagine though that rudder placement, shaft diameter, angle, depth from surface, angle, presence or absence of keel fins or active fin stabilizers, rolling, and more would impact the results.

    Thanks!

    BTW, for other readers, some other things I ran across related to combatants powering/shafts/etc., are:



    *** DESIGNING ALL ELECTRIC NAVAL SURFACE SHIPS

    http://alamperkapalan.files.wordpre...esigning-all-electric-naval-surface-ships.pdf


    *** SHIP VIBRATION
    http://www.eagle.org/eagleExternalP...ides/Current/147_ShipVibration/Pub147_ShipVib


    *** PROPULSION PLANT SIMULATION FOR FAST MILITARY VESSELS
    http://www.din.unina.it/HSMV 2011 Proceedings/html/Papers/19.pdf


    Ship Propulsion Plant Transient Response Investigation using a ...

    http://www.naun.org/journals/energy/19-162.pdf
     
    Last edited: Sep 23, 2011
    1 person likes this.
  2. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Good readings. The primer on ship vibration is really well-done.
     
  3. CmbtntDzgnr
    Joined: Jun 2011
    Posts: 119
    Likes: 8, Points: 0, Legacy Rep: 120
    Location: somewhereonearth

    CmbtntDzgnr Senior Member

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