{"id":392828,"date":"2024-11-05T16:38:19","date_gmt":"2024-11-05T16:38:19","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392828\/"},"modified":"2024-11-05T16:38:19","modified_gmt":"2024-11-05T16:38:19","slug":"392828","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392828\/","title":{"rendered":"Reply To: AQWA: Hydrodynamic response error"},"content":{"rendered":"<p>&lt;p&gt;Yes, the relative motions may be too big. What can be the reason for this? is it just due to the mass and inertial properties of the system? or anything else?&lt;\/p&gt;&lt;p&gt;Also I tried to run the Frequency statistical analysis with the jonswap spectrum with Hs = 1m and the I also added all the connections as used in the reference article with all ball&amp;socket connections as shown in the figure below. The Pitch RAOs seems to match better than the RAOs from the diffraction analysis as shown in the plots below.&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/05-11-2024-1730824494-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;So, I wanted to know a few things:&lt;\/p&gt;<\/p>\n<ol>\n<li>How is the HR analysis giving errors whereas the frequency statistical analysis works without any errors?<\/li>\n<li>I observed that the Pitch RAOs match well but other RAOs such as Roll and yaw dont match well. Does that mean there is something wrong in the model??<\/li>\n<li>Also I get the info that &#8221; DAMPING FOR SOME FREEDOMS IS VERY SMALL VALUE SET TO NOMINAL 0.5% CRITICAL.&#8221; . I tried also adding additional damping matrix in the surge direction to a large number, but still in the .LIS file, the percentage of critical damping still says 0%. So this value doesnt change irrespective of any high number I give in the additional damping matrix. Why is it so?<\/li>\n<\/ol>\n<p>&lt;p&gt;Can you please let me know the answers to the above questions.&lt;\/p&gt;&lt;p&gt;Thanks!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392828","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Yes, the relative motions may be too big. 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