{"id":381780,"date":"2024-09-06T20:51:13","date_gmt":"2024-09-06T20:51:13","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reaction-forces-and-moments-during-random-vibration-at-local-coordinate-systems\/"},"modified":"2024-09-06T20:51:13","modified_gmt":"2024-09-06T20:51:13","slug":"reaction-forces-and-moments-during-random-vibration-at-local-coordinate-systems","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reaction-forces-and-moments-during-random-vibration-at-local-coordinate-systems\/","title":{"rendered":"Reaction forces and moments during random vibration at local coordinate systems"},"content":{"rendered":"

<p>Hi all,<\/p><p>I am attempting to extract reaction forces and moments at named selections during random vibration analysis. I am mostly following the method outlined here:<\/p><p>https:\/\/www.padtinc.com\/2011\/06\/15\/retrieving-accurate-psd-reaction-forces-in-ansys-mechanical\/<\/a><\/p><p>My problem is that the forces and moments are delivered in the global coordinate system, and since this is a random analysis, they are always positive. So I cannot use a typical transformation matrix to transfer them into another coordinate system. Is there another method I can use to do this?<\/p><p>I have also experimented with using NROTAT to rotate the nodes of interest and then using *GET to extract the force at each node, but I can’t extract moments this way with a model composed of 3D elements.<\/p><p>Thanks for your assistance.<\/p><\/p>\n","protected":false},"template":"","class_list":["post-381780","topic","type-topic","status-publish","hentry","topic-tag-ansys-mechanical-apdl","topic-tag-force-reaction","topic-tag-random-vibration"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t