Can tension in a h_cat be zero ?

In the frequency domain, the tension on h_cat lines showing zero for a 4 point mooring analysis. is it valid? because I provide pre-tension as 1MT (Moses version connect edition 10.10). 

  • Hi Sai Kumar,

    You give me a small amount of information to work with.  But, allow me to try to respond.

    When you defined pretension, you used the &connector command before you entered the frequency domain menu?  Did you check the tensions right before you entered the frequency domain menu?

    A tension of 1 MT should be read in context of your analysis.  Depending on the length and size of the line 1 MT can seem rather small.  However if the length is short and the line is thin with low density, 1 MT can be reasonable.  What length and size of line are your modeling?  What are the properties of your mooring line?

    Again, a tension of 1 MT should be read in context of your analysis.  What is the size of vessel and the severity of the environment that you are analyzing?  Is 1 MT 1% of the mean environmental force or is it 15%, 20%, or 25% of the mean environmental force?

    The report titled Connector Force Statistics reports with two decimal places.  If the expected change in tension in each of the lines is less than can be presented with two decimal places you are going to need a different method to find the statistical expected forces.

    Have a review of the above points.

    Thank you,

    Georgina Maldonado

  • Hello Georgina,
    I'm trying to model a spud with a barge to find out the load coming onto the spud while the spud is lowered as a part of spud mooring analysis. 

    As I'm new to moses I want to know how to model a spud and connect spud to barge and soil. If possible can you give me specific commands (cif & dat) files where I can get the magnitude of load on spud, that would help me so much.

  • Hi Sai Kumar,

    I did not understand your response.  I believe you wanted to put a question mark after the word "much".

    You are trying to model a spud with a barge.  It is unclear what is being moored.  Your first statement contains "spud is lowered".  Is the spud also moving?

    Please contact me at georgina.maldonado@bentley.com.  Please include your company name and your Bentley account number.

    Georgina Maldonado

  • It is a 8 point mooring analysis, I already run the analysis barge floating scenario. Now i want to lower the spud and check loads coming onto the spud due to environment. so for that scenario i want to know how to do that analysis and get loads on spud

  • Hi Sai Kumar.

    I am not understanding your request.  As best as I can figure you are doing a lift analysis.  Please see the example file "sidelift" that comes with the software.  In the version 12 installation the files can be found in the following directory.

    C:\Program Files\Bentley\Engineering\MOSES CONNECT Edition V12\hdesk\runs\samples\how_to

    I hope this helps.

    Georgina Maldonado