{"id":162207,"date":"2023-01-25T07:34:37","date_gmt":"2023-01-25T07:34:37","guid":{"rendered":"\/knowledge\/forums\/topic\/is-it-possible-to-perform-a-sine-on-random-vibration-analysis-in-either-mechanical-or-mechanical-apdl\/"},"modified":"2023-07-31T12:36:35","modified_gmt":"2023-07-31T12:36:35","slug":"is-it-possible-to-perform-a-sine-on-random-vibration-analysis-in-either-mechanical-or-mechanical-apdl","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/is-it-possible-to-perform-a-sine-on-random-vibration-analysis-in-either-mechanical-or-mechanical-apdl\/","title":{"rendered":"Is it possible to perform a sine-on-random vibration analysis in either Mechanical or Mechanical APDL?"},"content":{"rendered":"<p>Neither Mechanical nor Mechanical APDL provides an automated method for performing a sine-on-random vibration analysis.  A harmonic response analysis is deterministic (real + imaginary results), where as a random vibration analysis is statistical (1-sigma results).  So, it is not clear how to combine the results.  Two methods employed sometimes employed to simulate the sine-on-random effect are:  1. Include the harmonic loading (sine) as a &#8216;spike&#8217; in the PSD input spectrum (area of sine loading should have same energy content) and then perform a single combined PSD analysis. 2. Perform a separate harmonic response and random vibration analysis and convert the harmonic response results to &#8220;RMS&#8221;&#8221; values.  Then statistically add the RMS results from the harmonic analysis to random vibration results.<\/p>\n","protected":false},"template":"","class_list":["post-162207","topic","type-topic","status-publish","hentry","topic-tag-4457","topic-tag-fatigue","topic-tag-mechanical-apdl-f-ansys","topic-tag-random-vibration","topic-tag-structural-dynamics","topic-tag-structural-mechanics"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27792"],"_bbp_last_active_time":["1-24-2023  20:20:13"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["3749"],"siebel_km_number":["2026858"],"product_version":["14"],"km_published_date":["2012-12-28T20:19:25.000Z"],"family":["Structural Mechanics"],"application_name":["Mechanical APDL (f. ANSYS)"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/162207","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/162207\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=162207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}