{"id":166508,"date":"2023-03-17T13:12:04","date_gmt":"2023-03-17T13:12:04","guid":{"rendered":"\/knowledge\/forums\/topic\/do-you-have-any-tests-verifying-force-excitation-psd-by-comparison-to-the-more-common-base-excitation-psd\/"},"modified":"2023-07-31T12:31:57","modified_gmt":"2023-07-31T12:31:57","slug":"do-you-have-any-tests-verifying-force-excitation-psd-by-comparison-to-the-more-common-base-excitation-psd","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/do-you-have-any-tests-verifying-force-excitation-psd-by-comparison-to-the-more-common-base-excitation-psd\/","title":{"rendered":"Do you have any tests verifying force excitation PSD by comparison to the more common base excitation PSD?"},"content":{"rendered":"

SR 1323472733 Yes, the inputs below give the same solution for force and base excitation when one force is used. There’s no comparison possible when multiple forces are used. ! base excitation \/prep7 et,1,188 mp,ex,1,1e7 mp,dens,1,.0003 mp,nuxy,1,.03 sectype,1,beam,rect secdata,.4,.2 et,2,21 r,2,1e6,1e6,1e6 n,1 n,11,20 fill e,1,2 *repe,10,1,1 d,1,all d,11,all fini \/solu antype,modal modop,lanb,24 mxpand,all,,,yes solve fini \/solu antype,spectrum spopt,psd,,yes d,1,uy,1 psdunit,1,acel psdres,disp,abs psdfrq,1,,1,10,100,1000 psdval,1,1000,1000,1000,1000 pfact,1 psdcom solve fini \/post1 set,3,1 prdi prrsol etab,sbyt,smisc,32 etab,sbzt,smisc,34 pretab,sbyt,sbzt fini ! force excitation \/prep7 et,1,188 mp,ex,1,1e7 mp,dens,1,.0003 mp,nuxy,1,.03 sectype,1,beam,rect secdata,.4,.2 et,2,21 r,2,1e6,1e6,1e6 n,1 n,11,20 fill e,1,2 *repe,10,1,1 type,2 real,2 e,1 d,1,all ddele,1,uy d,11,all fini \/solu antype,modal modop,lanb,24 mxpand,all,,,yes solve fini \/solu antype,spectrum spopt,psd,,yes f,1,fy,1e6 psdunit,1,forc psdfrq,1,,1,10,100,1000 psdval,1,1000,1000,1000,1000 pfact,1,node psdcom solve fini save \/post1 set,3,1 prdi prrsol etab,sbzt,smisc,34 etab,sbyt,smisc,32 pretab,sbzt,sbyt <\/p>\n

Attachments:
\n1. 2034964.zip<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166508","topic","type-topic","status-publish","hentry","topic-tag-14-5","topic-tag-mechanical-apdl","topic-tag-random-vibration","topic-tag-structural-dynamics","topic-tag-structural-mechanics"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3\/15\/2023 20:20"],"_bbp_forum_id":["27792"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["496"],"siebel_km_number":["2034964"],"product_version":["14.5"],"km_published_date":["2013-12-31T03:22:06.000Z"],"family":["Structural Mechanics"],"application_name":["Mechanical APDL"]},"test":"solution"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166508","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\/166508\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=166508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}