Convert the MOSES Output for SACS.

Hi,

I would like to know if in MOSES is possible to convert the output for SACS input?

For example,

I will generate a combined model of stinger and barge to obtain frequency responses.

I run the time domain analysis by considering the seastates as defined in the input.

I will then have the MOSES Output of Forces of X,Y,Z of stinger's each beam model against the load of seastate.

The stinger model was converted from SACS to MOSES.

And back to SACS again for further analysis with combined hydrodynamic member load as generated in MOSES.

  • Hi Jamhari,


    Thank you for using MOSES.
    You can use MOSES Hull Mesher for the conversion. I mean, it has a feature to export a structural model of MOSES in SACS format. To do this, click the "open MOSES" tab in the hull mesher and then click "export -> SACS structure". This gives you the SACS model file, sacinp.filename.


    If the purpose of conversion is for the structural post-processing such as code check of beams and plates in SACS, you can use MOSES Postvue. This structural (and graphical) post-processor has the same functionality as SACS Postvue (graphical result viewer), SACS Post (code check) and SACS JointCan (connection failure check). This feature will be released before the end of this month. Good news is, it comes with the basic module of MOSES!

    Please let me know if you need further assistance. 

    Best regards,

    Bitna

  • Hi Bitna,

    Thank you for your responding.

    Can you please also clarify more that MOSES able to extract the MEMBER LOAD CASES generated due to Environment load conditions (stinger+barge), which will be added as it is as a input in SACS file?

    Understand that MOSES able to do many structural checks however I'm naval background and the structure team need the member load cases from MOSES.

    Thanks and regards.

  • Hi Jamhari, 

    Yea, I understand. The command, &emit -sacs is to export applied load cases in SACS format. If you issue this command, the ppo file containing the SACS format loads is generated in the ans folder (or a folder you specify). TO use this command, you need to add a specific command when you convert the model from SACS. Please refer to the manual for more information. It is under the section XII The Moses Model. One thing to note is, this command only exports the applied load cases. In other words, if the loads need to be updated through iteration (e.g. gapped analysis), you should solve the structure using the MOSES solver. This is one of the reasons the post-processor of SACS (PostVue) is integrated with MOSES. For more discussion, you can contact me directly. Bitna.Seo@Bentley.com

    Best regards,

    Bitna

  • Hi Bitna,

    Would you please advise how am I supposed to define the connector between the stern barge and two hinges stinger as I referred to 

    "SACS-MOSES Interoperability: Making the case for transportation analyses"

    the case is sea fastened jacket to the barge with tiedown and vertical can?

    Thanks and regards.

  • Good afternoon Jamhari,

    As shown in the document, the tow_auto.dat contains two sets, namely post_nod and stbd_nod where the bottom of the can nodes are defined. These nodes are used to define the barge/cargo connections.

    You will need to define the vertical cans if they do not exist in your jacket or cargo unit.

    Best Regards

    Regards,
    Spiro J. Pahos
    Bentley Systems, Inc.