Acceleration

Discussion in 'Class Societies' started by NavArc..., Apr 17, 2018.

  1. NavArc...
    Joined: Nov 2016
    Posts: 20
    Likes: 1, Points: 3, Legacy Rep: 10
    Location: United Kingdom

    NavArc... Junior Member

    Hello,

    Is there anywhere in LR or other class rules where it states what the force/acceleration is due to heeling? So when designing an equipment seat, what factor do you use to account for roll..it must be designed slightly stronger since the ship is not static
     
  2. gonzo
    Joined: Aug 2002
    Posts: 15,150
    Likes: 910, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Heeling is static, hence no acceleration. Changes in heeling or rolling will have accelerations. I find it an interesting subject. Also, classification societies and regulations are addressing the ergonomics of acceleration.
     
  3. NavArc...
    Joined: Nov 2016
    Posts: 20
    Likes: 1, Points: 3, Legacy Rep: 10
    Location: United Kingdom

    NavArc... Junior Member

    Gonzo, agree with what you say. So yeah, is there anywhere in class rules that gives a guide on acceleration due to change in heel...
     
  4. gonzo
    Joined: Aug 2002
    Posts: 15,150
    Likes: 910, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

  5. Ad Hoc
    Joined: Oct 2008
    Posts: 6,837
    Likes: 792, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    In LR SSC rules, there is nothing specific, just the usual, nominal 0.2g longitudinal and 0.5g transverse. But states designer to supply data for foundations where appropriate.
    In the Big Ship rules, it is basically the same. However guidance is also given such as in Pt.3 Ch.14. Sec.8:

    upload_2018-4-18_8-42-30.png

    In the Common Structural rules for Tankers etc there is a section dedicated to ship motions, Section 7 Loads, sec.3.3

    upload_2018-4-18_8-46-51.png

    Etc etc...with more on the following section.

    So, there is some guidance, depends upon the type of boat you are designing using LR rules.
     
    NavArc... likes this.
  6. gonzo
    Joined: Aug 2002
    Posts: 15,150
    Likes: 910, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    I think he is asking about seats. There are some rules about the acceleration the crew can be exposed to, particularly for high speed vessels. As far as I know they are not part of any class society, but other organizations like OSHA and ISO
     
  7. Ad Hoc
    Joined: Oct 2008
    Posts: 6,837
    Likes: 792, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    Yes, seats = seatings = foundations = for any heavy equipment that is fixed.

    Seats is a generic word for all.
     
  8. NavArc...
    Joined: Nov 2016
    Posts: 20
    Likes: 1, Points: 3, Legacy Rep: 10
    Location: United Kingdom

    NavArc... Junior Member

    Nice one Ad hoc, this is what I am looking for. Thanks for your reply!
     

  9. gonzo
    Joined: Aug 2002
    Posts: 15,150
    Likes: 910, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    I totally misread that
     
Loading...
Similar Threads
  1. AndreO
    Replies:
    9
    Views:
    4,908
  2. Kastally80
    Replies:
    1
    Views:
    3,037
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.