{"id":39233,"date":"2019-11-27T08:08:08","date_gmt":"2019-11-27T08:08:08","guid":{"rendered":"\/forum\/forums\/topic\/using-the-static-acoustics-analysis-to-calculate-the-displacement-of-two-masses-in-a-melamine-foam\/"},"modified":"2019-11-27T08:08:08","modified_gmt":"2019-11-27T08:08:08","slug":"using-the-static-acoustics-analysis-to-calculate-the-displacement-of-two-masses-in-a-melamine-foam","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/using-the-static-acoustics-analysis-to-calculate-the-displacement-of-two-masses-in-a-melamine-foam\/","title":{"rendered":"Using the Static Acoustics Analysis to calculate the displacement of two masses in a melamine foam"},"content":{"rendered":"

Hi all,<\/p>\n

<\/p>\n

I am going to perform a Harmonic Acoustics Analysis<\/em> on a pre-stressed structure using a Static Acoustics Analysis<\/em>. I first used the Static Acoustics Analysis<\/em> to calculate the displacement of two masses in a melamine foam under gravity, but the following error occurred during the calculation:<\/p>\n

<\/p>\n

1) Warning: Solver pivot warnings or errors have been encountered during the solution. This is usually a result of an ill conditioned matrix possibly due to unreasonable matertial properties, an under constrained model, or contact related issues. Check results carefully.<\/p>\n

<\/p>\n

2) Error: A solver pivot warnings or errors have been detected in the UZ degree of freedom of node 348048 located in 1(3). This is usually a result of an ill conditioned matrix possibly due to unreasonable matertial properties, an under constrained model, or contact related issues. Check results carefully.<\/p>\n

<\/p>\n

3) Warning: One or more remote boundary condition is scoped to a large number of elements which can adversly affect slover performance. Consider using the pinball setting to reduce the number of elements included in the solver.<\/p>\n

<\/p>\n

4) Warning: Not enough constraints appear to be applied to prevent rigid body motion. This may lead to solution warnings or errors. Check results carefully.<\/p>\n

<\/p>\n

5) Error: Solver pivot warnings or errors have been encountered during the solution. This is usually a result of an ill conditioned matrix possibly due to unreasonable matertial properties, an under constrained model, or contact related issues. Check results carefully.<\/p>\n

<\/p>\n

And here are some material properties and boundary conditions I set:<\/p>\n

<\/p>\n

Melamine foam:<\/strong><\/p>\n

<\/p>\n

\"Material<\/strong><\/p>\n

<\/p>\n

The two masses:<\/strong><\/p>\n

<\/p>\n

\"Material<\/strong><\/p>\n

<\/p>\n

Steel panel:<\/strong><\/p>\n

<\/p>\n

\"Material<\/strong><\/p>\n

<\/p>\n

I use the Remote Displacement<\/em> to constrain the three translational degree of freedom on the four sides of the model:<\/strong><\/p>\n

<\/p>\n

\"\"<\/strong><\/p>\n

<\/p>\n

Here is a picture of the Melamine foam being hidden:<\/strong><\/p>\n

<\/p>\n

\"Screenshot\"<\/strong><\/p>\n

<\/p>\n

\"\"<\/strong><\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

Any suggestions for solving this problem?<\/p>\n

<\/p>\n

Thanks : )<\/p>\n

<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-39233","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["11412"],"_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":["1883"],"_bbp_subscription":["240345"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["39233"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","165659","181060"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["134494"],"_bbp_last_active_id":["134494"],"_bbp_last_active_time":["2020-11-30 11:09:49"]},"test":"ronclaudel"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/39233","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\/39233\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=39233"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}