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<?xml-stylesheet type="text/xsl" href="https://communities.bentley.com/cfs-file/__key/system/syndication/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/"><channel><title>A V SAI KUMAR's Activities</title><link>https://communities.bentley.com/members/1d77bf7c_2d00_dd21_2d00_4087_2d00_8b66_2d00_f953d8f26a7c</link><description>A V SAI KUMAR's recent activity</description><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>HOW TO GENERATE SEA STATE RAO IN MOSES?</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/246819/how-to-generate-sea-state-rao-in-moses</link><pubDate>Thu, 22 Jun 2023 11:08:53 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:72e45eca-57d5-443e-addd-4a98933ffcb8</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;Dear Georgina,&lt;/p&gt;
&lt;p&gt;Kindly advise how to generate sea state RAO in MOSES.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Mooring line dynamics (MOSES)</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/243611/mooring-line-dynamics-moses</link><pubDate>Thu, 30 Mar 2023 16:32:55 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:93a24a9f-81de-4a7a-ae70-271c68f8cf0e</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;font-size:inherit;"&gt;Dear Georgina,&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;font-size:inherit;"&gt;I have a comment from one of the classification society saying that MOSES doesn&amp;#39;t take into effect of line dynamics in time domain simulation and hence we are instructed to use the higher factor of safety (similar to frequency domain) for the mooring lines in one of our ongoing projects. I have modelled mooring lines using B_cat option and performed a 3 hour time domain simulation. we understand that MOSES take into effect of line dynamics due to environment and vessel motions in time domain simulation. we even compared mooring line tensions with orcaflex because orcaflex uses finite element method for defining a mooring line and results are very near&amp;nbsp;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;font-size:inherit;"&gt;&lt;span style="text-decoration:underline;"&gt;&lt;/span&gt;kindly advise us on this to justify the calculation approach in MOSES.&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;font-size:inherit;"&gt;Below is the actual comment&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-size:inherit;"&gt;&lt;em&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;text-decoration:underline;"&gt;Quote&lt;/span&gt;&lt;/em&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-size:inherit;"&gt;&lt;em&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;"&gt;It is understood that the mooring lines modelling in MOSES does not allow to obtain the dynamic line response. As such, the &amp;quot;a&amp;quot; factor for the determination of design tension should not be 0.6, but 1.8&lt;/span&gt;&lt;/em&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-size:inherit;"&gt;&lt;em&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;text-decoration:underline;"&gt;Unquote&lt;/span&gt;&lt;/em&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>How the catenary lines are modelled in Moses?</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/241736/how-the-catenary-lines-are-modelled-in-moses</link><pubDate>Wed, 15 Feb 2023 16:26:24 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:3c2eff2f-f4c3-4243-9aed-7569b6ab37cc</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;Dear Georgina,&lt;/p&gt;
&lt;p&gt;How mooring line (B CAT, H CAT) lines are modelled in Moses, whether using the finite element approach or some other theory. I read through the Moses &lt;strong&gt;deals&lt;/strong&gt; document, but there is insufficient explanation. Please clarify.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Ask A Question II</title><link>https://communities.bentley.com/achievements/cd3cd235-25c1-476e-bb88-33a5705ca45a</link><pubDate>Thu, 12 Jan 2023 04:35:31 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:3c4679d6-a653-4477-a1f2-7a836d04ce58</guid><dc:creator /><description>Ask 10 questions in a forum.</description></item><item><title>Modelling in &amp;amp;Surface menu</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/240419/modelling-in-surface-menu</link><pubDate>Thu, 12 Jan 2023 04:35:30 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ef2e2d41-9b82-4324-9a3d-9c733ac98ef6</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;font-size:inherit;"&gt;I generated a model with four cylinders using the &lt;strong&gt;&amp;amp;surface&lt;/strong&gt; menu and exported the model as a 3D diffraction type.&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;font-size:inherit;"&gt;My query is whether the model generated can be considered a single 3D diffraction body (please refer to the attached). Also, I would like to know how the moses software treats it as a single 3D diffracted body when there are no interconnections between the cylinders. However, please advise whether we followed the correct way of modeling.&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span style="font-family:&amp;#39;times new roman&amp;#39;, times;font-size:inherit;"&gt;&lt;img style="max-height:240px;max-width:320px;" src="/resized-image/__size/640x480/__key/communityserver-discussions-components-files/343374/pastedimage1673498122145v1.png" alt=" " /&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Deafult -Ramp time in Moses</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/237403/deafult--ramp-time-in-moses</link><pubDate>Tue, 25 Oct 2022 11:22:11 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:af3efa99-a7b0-4bac-bc24-d685fc698b42</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;Hi Georgina,&lt;/p&gt;
&lt;p&gt;what is the default Ramp time considered in Moses.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>effect of &amp;quot;-SPEED&amp;quot; while computing RAO</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/236795/effect-of--speed-while-computing-rao</link><pubDate>Tue, 11 Oct 2022 07:19:48 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:9ba88bb2-0127-42ce-935e-9daba24c0cbc</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;Hi Georgina,&lt;/p&gt;
&lt;p&gt;Does the &amp;quot;-SPEED&amp;quot; option while computing RAO have any effect on vessel RAO &amp;amp; Motions?&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Post Processing in Moses</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/236793/post-processing-in-moses</link><pubDate>Tue, 11 Oct 2022 07:10:21 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:1d7b56ec-1750-4a65-9ea5-c86afe70eeb4</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;Hi Georgina,&lt;/p&gt;
&lt;p&gt;Can you advise what is the significance of the command &amp;ldquo;IRREGULA&amp;rdquo; in the hydrodynamics post processing menu (given below FYI)?&lt;/p&gt;
&lt;p&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-discussions-components-files/343374/pastedimage1665472291696v1.png" alt=" " /&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Regarding wave trains and damping calculation</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/232636/regarding-wave-trains-and-damping-calculation</link><pubDate>Thu, 14 Jul 2022 17:14:13 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:9743e4e1-f30d-423e-8813-d38b1770c5cb</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;Dear Bentley team,&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;Query 1: I would like to know how to add Swell &amp;amp; wave trains in Moses for mooring and motion analysis.&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;Query 2: Also i would like to know how to read the&amp;nbsp; damping Matrix and damping values from Moses output inorder to compare with class rules and make sure damping considered in Moses is within the limits of classification society provided rules.&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;Thank you.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Dynamic wave bending moment  from MOSES</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/234739/dynamic-wave-bending-moment-from-moses</link><pubDate>Mon, 29 Aug 2022 14:42:07 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ee7d448c-0239-4b87-84ac-1a5b901327c4</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;Dear Bentley team,&lt;/p&gt;
&lt;p&gt;As we know for longitudinal strength, we take the wavelength of the wave equal to the length of the vessel for getting static wave bending moment and shear force.&lt;/p&gt;
&lt;p&gt;My query is is there a option a determine the dynamic wave bending moment and shear force from the hydrodynamic model.&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>How Spectral moments are correlated to RMS value while using multipliers to find maximum values when computing connector force statistics.</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/228188/how-spectral-moments-are-correlated-to-rms-value-while-using-multipliers-to-find-maximum-values-when-computing-connector-force-statistics</link><pubDate>Sat, 09 Apr 2022 08:44:32 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:763d2308-e0f3-40c1-b99e-b3b2e19754bd</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;In Moses, I performed a mooring analysis and computed connector force statistics. I noticed that the maximum values reported are multiplied by 3.72 to the RMS values. I looked on the forum for an explanation and found the responses presented below.&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;&amp;ldquo;&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;A:&lt;/strong&gt;&amp;nbsp;There are several way of&amp;nbsp;&lt;em&gt;estimating&lt;/em&gt;&amp;nbsp;the maximum. Normally, one does this statistically by assuming that the peaks are Raleigh distributed. If one makes this assumption, then he only needs to define what he means by maximum. In MOSES, you define what you mean. This is done by giving a duration to the seastate, or defining a multiplier. If you give a duration, MOSES will use the moments of the response spectrum and the duration to produce the probable maximum value. Alternatively, you can define a multiplier for the RMS of the spectrum. The default is to use a multiple of 3.72 which defines the maximum to be the average of the 1/1000th highest values. Other values for this multiplier are:&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; 2.00 - Significant value&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; 2.54 - average of 1/10th highest values&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; 3.03 - average of 1/100th highest values&lt;/p&gt;
&lt;p&gt;&amp;rdquo;&lt;/p&gt;
&lt;p&gt;&amp;ldquo;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;A:&lt;/strong&gt;&amp;nbsp;As stated in the MOSES Reference Manual,&amp;nbsp;&lt;a href="https://www.ultramarine.com/hdesk/ref_man/dfl.htm#-PROBABILITY"&gt;&amp;amp;DEFAULT -PROBABILITY&lt;/a&gt;&amp;nbsp;STAT PDATA controls the statistics which will be defined when computing the statistics of quantities in an irregular sea. The default is for STAT to refer to the MAXIMUM, and PDATA is 3.72 which provides the 1/1000 highest response, based on a Rayleigh distribution. This is the statistical multiplier the root mean square will be multiplied by to obtain a maximum. When DURATION is used for STAT, the time specified is used to determine the statistical multiplier. See equation 11.22 of the Time Series, Spectra and Extreme section in&amp;nbsp;&lt;a href="https://www.ultramarine.com/hdesk/document/include/deals.pdf"&gt;How MOSES Deals With:&amp;nbsp;&lt;/a&gt;(PDF).&lt;/p&gt;
&lt;p&gt;&amp;rdquo;&lt;/p&gt;
&lt;p&gt;According to the above responses, a multiplier of 3.72 to the RMS value is used to obtain a maximum of 1/1000th response. However, in the deals document equation 11.22, &lt;strong&gt;the multiplier of the square root of the 0&lt;sup&gt;th&lt;/sup&gt;&amp;nbsp;spectral moment is shown as 3.72.&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-discussions-components-files/343374/Screenshot-2022_2D00_04_2D00_09-124349.png" /&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;p&gt;My questions are&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;How spectral moments are correlated to RMS value when using a 3.72 multiplier?&lt;/li&gt;
&lt;li&gt;Can anyone explain why Moses refers to spectral moments in the deals document, but when calculating they actually multiply RMS value with the multiplier?&lt;/li&gt;
&lt;/ul&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>How young&amp;#39;s modulus is calculated in moses ?</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/216285/how-young-s-modulus-is-calculated-in-moses</link><pubDate>Tue, 06 Jul 2021 16:18:12 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:acc6de96-d8be-4b95-ab46-7ad326b2f682</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;young&amp;#39;s modulus AE showing when i input command @status cl_flex. i want to know how moses is calculation modulus of elasticity value. if there is any formula i want to know.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Semi-Submersible Modelling &amp;amp; Mooring</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/216039/semi-submersible-modelling-mooring</link><pubDate>Wed, 30 Jun 2021 15:31:47 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:279487b9-0ffe-4a24-b2e0-fba0734b5994</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;&lt;a href="https://communities.bentley.com/cfs-file/__key/communityserver-discussions-components-files/343374/dat-_2600_-cif.zip"&gt;communities.bentley.com/.../dat-_2600_-cif.zip&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;I&amp;#39;m trying to model a semi-submersible using &amp;amp;surface command. After that mooring analysis must be done, but im getting an error, where model is not showing after using mooring commands. I&amp;nbsp;have attached the (.cif &amp;amp; .dat) files used. I&amp;#39;m stuck with the error, im unable to proceed further.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Can tension in a h_cat be zero ?</title><link>https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/212249/can-tension-in-a-h_cat-be-zero</link><pubDate>Thu, 08 Apr 2021 11:08:30 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:085ffc20-af84-4469-906f-240d912defdf</guid><dc:creator>A V SAI KUMAR</dc:creator><description>&lt;p&gt;In the frequency domain, the tension on h_cat lines&amp;nbsp;showing zero for a 4 point mooring analysis. is it valid? because I provide pre-tension as 1MT (Moses version connect edition 10.10).&amp;nbsp;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>Ask A Question I</title><link>https://communities.bentley.com/achievements/460ac7df-7ccc-4c42-a204-9e05eef3be09</link><pubDate>Thu, 08 Apr 2021 00:58:57 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:3307a8e7-835f-46a4-bc14-c72039b66442</guid><dc:creator /><description>Ask a question in a forum.</description></item></channel></rss>