{"id":192340,"date":"2021-09-22T00:46:00","date_gmt":"2021-09-22T00:46:00","guid":{"rendered":"\/forum\/forums\/reply\/192340\/"},"modified":"2021-09-22T01:18:04","modified_gmt":"2021-09-22T01:18:04","slug":"192340","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/192340\/","title":{"rendered":"Reply To: Transient Analysis and Response Spectrum &#8211; Structural"},"content":{"rendered":"<p>Look at the Modal analysis. Plot the First Mode and play the animation. Look at the point on the model that has the maximum deformation. Look at the direction that point is moving.  Is it approximately moving along a Global Coordinate direction?  If not, create a coordinate system that has an axis parallel to the path that the maximum point is moving. Plot Directional Deformation of that point and select the direction which aligns with the path that point move along in the First mode animation.  Now you will have a plot that crosses zero and oscillates like a sine wave.<br \/>\nWith 4% damping and a 90 Hz first mode, here is the displacement response of a mass-spring-damper system excited by a 100 cm\/sec initial velocity.<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/184\/D9NCPSB46Y1G.png\" width=\"831\" height=\"259\" \/>If you don&#8217;t get this kind of decay, there is something wrong with your model.<\/p>\n","protected":false},"template":"","class_list":["post-192340","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=\"Look at the Modal analysis. Plot the First Mode and play the animation. Look at the point on the model that has the maximum deformation. Look at the direction that point is moving. Is it approximately moving along a Global Coordinate direction? If not, create a coordinate system that has an axis parallel to the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/192340\/\" \/>\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: Transient Analysis and Response Spectrum \u2013 Structural | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Look at the Modal analysis. Plot the First Mode and play the animation. Look at the point on the model that has the maximum deformation. Look at the direction that point is moving. Is it approximately moving along a Global Coordinate direction? If not, create a coordinate system that has an axis parallel to the\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/192340\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/184\/D9NCPSB46Y1G.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/forum-uploads\/184\/D9NCPSB46Y1G.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-09-22T00:46:00+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-09-22T01:18:04+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Transient Analysis and Response Spectrum \u2013 Structural | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Look at the Modal analysis. 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