{"id":158146,"date":"2022-06-06T09:58:49","date_gmt":"2022-06-06T09:58:49","guid":{"rendered":"\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/"},"modified":"2022-06-06T09:58:49","modified_gmt":"2022-06-06T09:58:49","slug":"in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/","title":{"rendered":"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency?"},"content":{"rendered":"<p>No.  For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance.  This is documented in the Structural Analysis Guide Section 1.2.4.  You can find the complete equation in the ANSYS Help documentation, under &#8220;Mechanical APDL -> Theory Reference -> 14.3.3 equation 14-22 parameter g, mj, gEj&#8221;.<br \/>The damping contribution g is related to the damping matrix by<br \/>[C]=(2*g\/Omega)*K<br \/>Omega is the excitation frequency.  So (2*g\/Omega) is a coefficient times the stiffness matrix like Beta damping.<br \/>Beta = 2*eta\/omega<br \/>omega is the natural frequency while<br \/>2*g\/Omega = 2*eta\/omega:<br \/>eta (ratio to critical) = g(omega\/Omega)<br \/>In a single degree of freedom test you will see the ratio to critical be higher at low excitation frequencies and lower at high excitation frequencies.<\/p>\n","protected":false},"template":"","class_list":["post-158146","topic","type-topic","status-publish","hentry","topic-tag-dmpstr-constant","topic-tag-sdampfrequency","topic-tag-tb"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"No. For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance. This is documented in the Structural Analysis Guide Section 1.2.4. You can find the complete equation in the ANSYS Help documentation, under &quot;Mechanical APDL -&gt; Theory Reference -&gt; 14.3.3 equation 14-22 parameter g, mj,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"No. For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance. This is documented in the Structural Analysis Guide Section 1.2.4. You can find the complete equation in the ANSYS Help documentation, under &quot;Mechanical APDL -&gt; Theory Reference -&gt; 14.3.3 equation 14-22 parameter g, mj,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2022-06-06T09:58:49+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2022-06-06T09:58:49+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"No. For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance. This is documented in the Structural Analysis Guide Section 1.2.4. You can find the complete equation in the ANSYS Help documentation, under &quot;Mechanical APDL -&gt; Theory Reference -&gt; 14.3.3 equation 14-22 parameter g, mj,\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/dmpstr-constant\\\/#listItem\",\"name\":\"dmpstr constant\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/dmpstr-constant\\\/#listItem\",\"position\":3,\"name\":\"dmpstr constant\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/dmpstr-constant\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\\\/#listItem\",\"name\":\"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\\\/#listItem\",\"position\":4,\"name\":\"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/dmpstr-constant\\\/#listItem\",\"name\":\"dmpstr constant\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\\\/\",\"name\":\"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency? | Ansys Knowledge\",\"description\":\"No. For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance. 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This is documented in the Structural Analysis Guide Section 1.2.4. You can find the complete equation in the ANSYS Help documentation, under \"Mechanical APDL -> Theory Reference -> 14.3.3 equation 14-22 parameter g, mj,","canonical_url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/knowledge","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/dmpstr-constant\/#listItem","name":"dmpstr constant"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/dmpstr-constant\/#listItem","position":3,"name":"dmpstr constant","item":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/dmpstr-constant\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/#listItem","name":"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency?"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/#listItem","position":4,"name":"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency?","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/dmpstr-constant\/#listItem","name":"dmpstr constant"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization","name":"Ansys Knowledge","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/knowledge\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/#webpage","url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/","name":"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency? | Ansys Knowledge","description":"No. For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance. This is documented in the Structural Analysis Guide Section 1.2.4. You can find the complete equation in the ANSYS Help documentation, under \"Mechanical APDL -> Theory Reference -> 14.3.3 equation 14-22 parameter g, mj,","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/#breadcrumblist"},"datePublished":"2022-06-06T09:58:49+00:00","dateModified":"2022-06-06T09:58:49+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website","url":"https:\/\/innovationspace.ansys.com\/knowledge\/","name":"Ansys Knowledge","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Knowledge | Ansys Innovation Space","og:type":"article","og:title":"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency? | Ansys Knowledge","og:description":"No. For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance. This is documented in the Structural Analysis Guide Section 1.2.4. You can find the complete equation in the ANSYS Help documentation, under &quot;Mechanical APDL -&gt; Theory Reference -&gt; 14.3.3 equation 14-22 parameter g, mj,","og:url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/","article:published_time":"2022-06-06T09:58:49+00:00","article:modified_time":"2022-06-06T09:58:49+00:00","twitter:card":"summary_large_image","twitter:title":"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency? | Ansys Knowledge","twitter:description":"No. For a single mode, the ratio to critical is greater at frequencies below resonance and smaller at frequencies above resonance. This is documented in the Structural Analysis Guide Section 1.2.4. You can find the complete equation in the ANSYS Help documentation, under &quot;Mechanical APDL -&gt; Theory Reference -&gt; 14.3.3 equation 14-22 parameter g, mj,"},"aioseo_meta_data":{"post_id":"158146","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2025-10-17 18:05:53","updated":"2026-07-29 04:16:59","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/dmpstr-constant\/\" title=\"dmpstr constant\">dmpstr constant<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tIn a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency?\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/knowledge"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/"},{"label":"dmpstr constant","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/dmpstr-constant\/"},{"label":"In a harmonic analysis, is the damping produced by MP,DMPR; TB,SDAMP; and DMPSTR constant vs frequency?","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/in-a-harmonic-analysis-is-the-damping-produced-by-mpdmpr-tbsdamp-and-dmpstr-constant-vs-frequency\/"}],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["06-06-2022 20:20"],"_bbp_forum_id":["27792"],"_btv_view_count":["902"],"_bbp_likes_count":["0"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/158146","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\/158146\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=158146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}