{"id":165587,"date":"2023-03-17T09:00:42","date_gmt":"2023-03-17T09:00:42","guid":{"rendered":"\/knowledge\/forums\/topic\/in-a-random-vibration-analysis-what-is-grms-and-how-can-it-be-calculated\/"},"modified":"2023-07-31T12:31:33","modified_gmt":"2023-07-31T12:31:33","slug":"in-a-random-vibration-analysis-what-is-grms-and-how-can-it-be-calculated","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-random-vibration-analysis-what-is-grms-and-how-can-it-be-calculated\/","title":{"rendered":"In a random vibration analysis, what is “GRMS” and how can it be calculated?"},"content":{"rendered":"

In an ANSYS random vibration analysis, root-mean-square (RMS) values are referred to as “one-sigma” values. So, the RMS acceleration is the one-sigma acceleration. “G” refers to the acceleration expressed in terms of the gravitational acceleration. So “GRMS” is the one-sigma acceleration in terms of G. In \/POST1, the calculated one-sigma accelerations are stored in load step 5. To obtain the one-sigma acceleration in terms of G (GRMS), simply divide the one-sigma acceleration values by the gravitational acceleration constant using the SET command. \/post1 set,5,1,1\/386.4 ! for BIN unit system<\/p>\n","protected":false},"template":"","class_list":["post-165587","topic","type-topic","status-publish","hentry","topic-tag-4653","topic-tag-mapdl","topic-tag-mechanical-apdl-f-ansys","topic-tag-modal-harmonic-response","topic-tag-structural-dynamics","topic-tag-structural-mechanics"],"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