{"id":365338,"date":"2024-05-03T07:29:26","date_gmt":"2024-05-03T07:29:26","guid":{"rendered":"\/forum\/forums\/topic\/why-does-mass-matrix-only-have-values-in-the-x-direction\/"},"modified":"2024-05-03T07:29:26","modified_gmt":"2024-05-03T07:29:26","slug":"why-does-mass-matrix-only-have-values-in-the-x-direction","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-does-mass-matrix-only-have-values-in-the-x-direction\/","title":{"rendered":"Why does  mass matrix only have values in the x-direction?"},"content":{"rendered":"<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/03-05-2024-1714720728-mceclip0.png\"><\/p>\n<div class=\"css-1j17jy3\">\n<p class=\"css-1tyg60j\">Hi,<\/p>\n<p class=\"css-1tyg60j\">I&nbsp; used the SMAT command to export the mass matrix in modal analysis. However, I noticed that the mass matrix only contains values in the X-direction, unlike the stiffness matrix. Could someone explain why this is the case?<\/p>\n<p class=\"css-1tyg60j\">&nbsp;<\/p>\n<p class=\"css-1tyg60j\">Also,&nbsp; displacement values do not diverge when I conduct a quasistatic analysis ignoring mass ( I used Newmark method *gamma = 0.005). However, when I include mass and use the transient analysis with F(t)=Ku(t)+Mu&#8221;(t), the values diverge.<\/p>\n<\/div>\n<div class=\"css-maj3td\">&nbsp;<\/div>\n","protected":false},"template":"","class_list":["post-365338","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi,I used the SMAT command to export the mass matrix in modal analysis. However, I noticed that the mass matrix only contains values in the X-direction, unlike the stiffness matrix. Could someone explain why this is the case? 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However, I noticed that the mass matrix only contains values in the X-direction, unlike the stiffness matrix. Could someone explain why this is the case? 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Also, displacement values do not diverge when I conduct a quasistatic analysis ignoring mass ( I used Newmark","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-does-mass-matrix-only-have-values-in-the-x-direction\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/03-05-2024-1714720728-mceclip0.png","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/03-05-2024-1714720728-mceclip0.png","article:published_time":"2024-05-03T07:29:26+00:00","article:modified_time":"2024-05-03T07:29:26+00:00","twitter:card":"summary_large_image","twitter:title":"Why does mass matrix only have values in the x-direction? | Ansys Learning Forum","twitter:description":"Hi,I used the SMAT command to export the mass matrix in modal analysis. However, I noticed that the mass matrix only contains values in the X-direction, unlike the stiffness matrix. 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