{"id":42102,"date":"2020-03-25T14:09:45","date_gmt":"2020-03-25T14:09:45","guid":{"rendered":"\/forum\/forums\/topic\/modal-analysis-error\/"},"modified":"2020-03-25T14:09:45","modified_gmt":"2020-03-25T14:09:45","slug":"modal-analysis-error","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modal-analysis-error\/","title":{"rendered":"Modal analysis error"},"content":{"rendered":"

Hi,<\/p>\n

<\/p>\n

I am doing Modal acoustic analysis, and I got this warning:<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

*** WARNING ***                         CP =       0.969   TIME= 14:53:20<\/p>\n

<\/p>\n

Element shape checking is currently inactive.  Issue SHPP,ON or  SHPP,WARN to reactivate, if desired.                                    <\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

*** WARNING ***                         CP =       1.281   TIME= 14:53:21<\/p>\n

<\/p>\n

The ending frequency 100000000 (Hz) in MODOPT command may be too high   <\/p>\n

<\/p>\n

for acoustic modal analysis.  It is recommended to use 1000000 (Hz) as  <\/p>\n

<\/p>\n

the ending frequency.                                                   <\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

*** WARNING ***                         CP =       2.172   TIME= 14:53:22<\/p>\n

<\/p>\n

Coefficient ratio exceeds 1.0e8 – Check results.                        <\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

*** WARNING ***                         CP =       2.391   TIME= 14:53:22<\/p>\n

<\/p>\n

The damped eigensolver did not find a damping matrix.  For efficiency,  <\/p>\n

<\/p>\n

please use an eigensolver that does not consider damping to solve this  <\/p>\n

<\/p>\n

model.                                                                  <\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

*** WARNING ***                         CP =       3.844   TIME= 14:53:23<\/p>\n

<\/p>\n

The eigenproblem is ill-conditioned (relative residual from test linear <\/p>\n

<\/p>\n

solve: 1.137193E-03).  The accuracy of the solution may not be          <\/p>\n

<\/p>\n

satisfactory.  Modifying the initial value of the frequency shift       <\/p>\n

<\/p>\n

(FREQB in the MODOPT command) or changing the boundary conditions of    <\/p>\n

<\/p>\n

the model might solve the problem.                                      <\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

*** WARNING ***                         CP =      31.172   TIME= 14:53:51<\/p>\n

<\/p>\n

Fewer modes than the requested number of modes ( 12 ) were computed.    <\/p>\n

<\/p>\n

The range specified (FREQB= 0, FREQE= 100000000) contains only 0        <\/p>\n

<\/p>\n

modes.                                                                  <\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-42102","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["14282"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1902"],"_bbp_subscription":["248664"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["42102"],"_bbp_forum_id":["27791"],"_bbp_engagement":["174445"],"_bbp_voice_count":["1"],"_bbp_reply_count":["0"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["42102"],"_bbp_last_active_time":["2020-03-25 14:09:45"]},"test":"dardhruv"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/42102","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\/42102\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=42102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}