{"id":236828,"date":"2022-09-30T19:21:05","date_gmt":"2022-09-30T19:21:05","guid":{"rendered":"\/forum\/forums\/topic\/only-partial-match-between-msup-and-full-harmonic-analysis\/"},"modified":"2022-09-30T19:21:05","modified_gmt":"2022-09-30T19:21:05","slug":"only-partial-match-between-msup-and-full-harmonic-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/only-partial-match-between-msup-and-full-harmonic-analysis\/","title":{"rendered":"Only partial match between MSUP and FUll Harmonic analysis"},"content":{"rendered":"

Hello,<\/p>\n

I’m trying to find the frequency response of a structure that is subjected to accelerations in x-, y-, and z-direction, respectively. Using Full Harmonic gives satisfying results but computational times are too long which is why I want to switch to MSUP. I know from solution #855002 on the Customer Portal that the required required must extend past the range of interest. I’m interested in the first 6 modes and work with the first 200 modes. The only matching result from MSUP is in z-direction. The first image below is from the Full Harmonic and the second from the MSUP analysis, both show displacements.<\/p>\n

<\/p>\n

<\/p>\n

Below are parts of the APDL code I’m using:<\/p>\n

antype,MODAL
modopt,LANB,200,0,0,,OFF
mxpand,200,,,YES,,YES
outres,ERASE
outres,ALL,ALL
outpr,ERASE
outpr,ALL,NONE
resvec,ON
allsel
modcont,ON
thexpand,OFF
acel,89,0,0
allsel
save
solve
lsclear,INER
acel,0,89,0
allsel
save
solve
lsclear,INER
acel,0,0,89
allsel
save
solve
lsclear,INER
finish<\/pre>\n
The part below is repeated in the same way for the other two directions.<\/p>\n
antype,HARMIC
hropt,MSUP,,,YES
hrout,OFF,OFF,ON
harfrq,NINT(first eigenfrequency),NINT(sixth eigenfrequency),,,%freq_array%
nsubst,5000
dmprat,0.0001
kbc,1
resvec,ON
lvscale,1,1
lvscale,0,2
lvscale,0,3
outres,ERASE
outres,ALL,ALL
outpr,ERASE
outpr,ALL,NONE
solve
save
finish<\/pre>\n
\/SOLU
allsel
expass,ON
numexp,ALL
solve
finish<\/pre>\n
Post-processing is done in \/post26. I’m getting the displacement using the NSOL command.<\/p>\n
I would like to know why there’s no response in x- and y- direction when using MSUP. How must the code be changed to solve this problem?<\/p>\n
Thank you in advance!<\/p>\n","protected":false},"template":"","class_list":["post-236828","topic","type-topic","status-closed","hentry","topic-tag-apdl","topic-tag-full-harmonic","topic-tag-modal-analysis","topic-tag-mode-superposition"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["182889","23687"],"_bbp_author_ip":["23.192.164.14"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1054"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["236828"],"_bbp_forum_id":["27791"],"_bbp_engagement":["23687","182889"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["237315"],"_bbp_last_active_id":["237315"],"_bbp_last_active_time":["2022-10-10 13:33:51"]},"test":"waldmeisterswein"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/236828","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/236828\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=236828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}