DETERMINING CHAIN LENGH BASED ON PRETENSION VALUE (MOSES)

Hi,

I would like to ask how to find the length of chain based on given pretension value and anchor radius. Understand that moses are required to input the length i,e:

$CLUSTER 1

$ ------- SET OF MOORING CHAIN PARAMETER -----------------
$CHAIN = R4 STUDLESS
&SET WDEPTH = 63 $$ WATER DEPTH
&SET CDIA = 105 $$ CHAIN DIAMETER (MM)
&SET WPLEN = 0.221 $$ CHAIN WGT PER LENGTH (MT/M)
&SET CLEN = 600 $$ CHAIN TOTAL LENGTH

~201 B_CAT %CDIA% -DEPANCHOR %WDEPTH% -LEN %CLEN% -WTPLEN %WPLEN%
~202 B_CAT %CDIA% -DEPANCHOR %WDEPTH% -LEN %CLEN% -WTPLEN %WPLEN%
~203 B_CAT %CDIA% -DEPANCHOR %WDEPTH% -LEN %CLEN% -WTPLEN %WPLEN%

CONNECTOR ML01 -ANCHOR 180-65 600 ~201 *101
CONNECTOR ML02 -ANCHOR 180-70 600 ~202 *102
CONNECTOR ML03 -ANCHOR 180-75 600 ~203 *103

&TYPE SETTING PRETENSION VALUE AT EACH LINE
$ NAME PRETENSION
&connector ML01 -a_tension 76.76
&connector ML02 -a_tension 76.76
&connector ML03 -a_tension 76.76

Parents Reply Children
  • Hi Naim,

    Chain inertia is considered in the analysis as you provide the weight/length properties in the class definition. Additionally, you have the option to include the added mass (-AMASDIAMETER) and drag (-DRAGDIAMETER) in the line class definition.

    To incorporate line dynamics into your analysis, you can utilize the ROD connector class. There are numerous samples in the "mooring" (hdesk>>runs>>samples>>mooring) folder that have the rod element class defined. Please feel free to reach out if you have any further questions.

    Thanks,

    Rahul

    Answer Verified By: Naim Hassan