Click for Glendinning Click for Westport Click for Westport Click for Burger Click for Mulder

Vibration parameters

Discussion in 'General Yachting Discussion' started by Hawk, Dec 17, 2007.

You need to be registered and signed in to view this content.
  1. Hawk, Dec 17, 2007
    #1
    Hawk

    Hawk Senior Member

    Joined:
    Jul 19, 2005
    Messages:
    72
    Location:
    Vancouver BC
    Looking for some input on what would normally be the parameters expected on a yacht in the 140 (42m) range.

    A contract we are currently in the final stages of has asked for the following parameters and we are having little to no luck in finding what an acceptable level is. The ideal answer would be shown as a range from excellent to good to bad, so that we can target realistically what to insert in the contract.

    The contract is stating:

    Maximum velocity of 1,5mm/sec RMS for frequencies above 5Hz or a peak acceleration of 16mm/sec² for frequencies below 5Hz,

    Thanks in advance for the help.
  2. Neil Rooney, Dec 17, 2007
    #2
    Neil Rooney

    Neil Rooney Senior Member

    Joined:
    Sep 28, 2006
    Messages:
    173
    Location:
    On D Road
    Sent you an email for a contact who has experience with this issue.
  3. comship, Dec 17, 2007
    #3
    comship

    comship Senior Member

    Joined:
    Jan 27, 2007
    Messages:
    174
    Location:
    Greece
    In our case we shall hire DNV to measure vibrations and cerify that they are according to Classification standards
  4. K1W1, Dec 17, 2007
    #4
    K1W1

    K1W1 Senior Member

    Joined:
    Sep 30, 2005
    Messages:
    7,427
    Location:
    My Office
    Hi,

    Comship- Do you know what the Classification Society limits are for Vibration?

    If they come back and say Ok we found that you have a reading of 3mm/sec RMS for Frequencies above 5 Hz, and you feel a lot of vibration but this is within their standards how will you come back at the yard to say hey my boat vibrates a lot? I want something done about it.
  5. Hawk, Dec 17, 2007
    #5
    Hawk

    Hawk Senior Member

    Joined:
    Jul 19, 2005
    Messages:
    72
    Location:
    Vancouver BC

    Comship

    We are building to ABS and unfortuneatly where we at hitting a snag is the lawyers are pushing for language one way and ABS guidelines use different parameters. We tried to change language but it keeps coming back to us. YA gotta love Lawyers.

    Neil

    Thanks a bunch for that info you emailed me, I have sent an email off to that contact

    Thanks
  6. K1W1, Dec 17, 2007
    #6
    K1W1

    K1W1 Senior Member

    Joined:
    Sep 30, 2005
    Messages:
    7,427
    Location:
    My Office
    Hi,

    Hawk- I PM'd you the email addy of a guy I use a lot. He should be able to answer all your questions.
  7. Hawk, Dec 17, 2007
    #7
    Hawk

    Hawk Senior Member

    Joined:
    Jul 19, 2005
    Messages:
    72
    Location:
    Vancouver BC
    Thanks K1W1