{"id":387275,"date":"2024-09-27T10:48:09","date_gmt":"2024-09-27T10:48:09","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/387275\/"},"modified":"2024-09-27T10:48:09","modified_gmt":"2024-09-27T10:48:09","slug":"387275","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/387275\/","title":{"rendered":"Reply To: PSD (acceleration, g^2\/Hz) on a body for Random Vibration"},"content":{"rendered":"<p>&lt;p&gt;Hello Harshvardhan,&lt;\/p&gt;&lt;p&gt;Yes, I have tried changing PSDUNIT,1,PRESS to both PSDUNIT,1,ACEL and PSDUNIT,1,ACCG. Although it does not give me a calculation error, the results I get in the case of ACEL and ACCG. are equal to 0.&lt;\/p&gt;&lt;p&gt;I have looked at the Solver Output and the fundamental difference is that for ACEL and ACCG there is no PARTICIPATION FACTORS FOR NODAL EXCITATION, while for PRES there is. (I leave images below).&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/27-09-2024-1727433833-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;I have also tried to put CMACEL in the modal, to be able to use the LVSCALE for acceleration. But it does not work either.&lt;\/p&gt;&lt;p&gt;Below I leave the two commands. With &#8220;!&#8221; are the parts that I have used to try to insert the PSD as a g^2\/Hz acceleration.&lt;br&gt;For the Modal:&lt;\/p&gt;&lt;p&gt;sf,FACE3,press,1&lt;br&gt;!CMACEL,FACE3,1&lt;\/p&gt;&lt;p&gt;For the Harmonic:&lt;\/p&gt;&lt;p&gt;psdunit,1,pres&lt;br&gt;!psdunit,1,acel&lt;br&gt;!psdunit,1,accg&lt;br&gt;lvscale,100! scale pressure from modal&lt;br&gt;psdfrq,1,1,10,10000! create spectrum table using constant value \/ change as needed&lt;br&gt;psdval,1,10,10 ! create spectrum table using constant value \/ change as needed&lt;br&gt;pfact,1,node! nodal excitation&lt;br&gt;!dmprat,.01 ! damping ratio&lt;br&gt;!psdcom&lt;br&gt;!solve&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Could you help me with that?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Regards&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-387275","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello Harshvardhan,Yes, I have tried changing PSDUNIT,1,PRESS to both PSDUNIT,1,ACEL and PSDUNIT,1,ACCG. Although it does not give me a calculation error, the results I get in the case of ACEL and ACCG. are equal to 0.I have looked at the Solver Output and the fundamental difference is that for ACEL and ACCG there is no\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/387275\/\" \/>\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 Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: PSD (acceleration, g^2\/Hz) on a body for Random Vibration | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello Harshvardhan,Yes, I have tried changing PSDUNIT,1,PRESS to both PSDUNIT,1,ACEL and PSDUNIT,1,ACCG. Although it does not give me a calculation error, the results I get in the case of ACEL and ACCG. are equal to 0.I have looked at the Solver Output and the fundamental difference is that for ACEL and ACCG there is no\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/387275\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/27-09-2024-1727433833-mceclip0.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/27-09-2024-1727433833-mceclip0.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-09-27T10:48:09+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-09-27T10:48:09+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: PSD (acceleration, g^2\/Hz) on a body for Random Vibration | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello Harshvardhan,Yes, I have tried changing PSDUNIT,1,PRESS to both PSDUNIT,1,ACEL and PSDUNIT,1,ACCG. 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Although it does not give me a calculation error, the results I get in the case of ACEL and ACCG. are equal to 0.I have looked at the Solver Output and the fundamental difference is that for ACEL and ACCG there is no","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/387275\/#breadcrumblist"},"datePublished":"2024-09-27T10:48:09+00:00","dateModified":"2024-09-27T10:48:09+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: PSD (acceleration, g^2\/Hz) on a body for Random Vibration | Ansys Learning Forum","og:description":"Hello Harshvardhan,Yes, I have tried changing PSDUNIT,1,PRESS to both PSDUNIT,1,ACEL and PSDUNIT,1,ACCG. 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