{"id":29660,"date":"2018-07-08T04:10:39","date_gmt":"2018-07-08T04:10:39","guid":{"rendered":"\/forum\/forums\/topic\/acoustic-transmission-loss\/"},"modified":"2018-07-08T04:10:39","modified_gmt":"2018-07-08T04:10:39","slug":"acoustic-transmission-loss","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/acoustic-transmission-loss\/","title":{"rendered":"Acoustic Transmission Loss"},"content":{"rendered":"<p>I made an Impedance Tube with a steel plate in the center of the air duct using ANSYS 19.1 Student.<\/p>\n<p><\/p>\n<p>I coupled two systems together to get the FSI coupling between the air and the steel.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3e825b35-df61-45f5-9693-a81101684b62\/329f31d7-a6d9-436c-b3db-a91700431eb7_compose-mail---peternewmancsh@gmail.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I got the speaker side (Up) frequency response on the speaker side of the plate as shown here:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3e825b35-df61-45f5-9693-a81101684b62\/48614a2b-56d4-4638-aaf8-a9170043900e_greenshot-2018-07-08-00-05-39.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>While the Down side of the steel plate has this Frequency Response:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3e825b35-df61-45f5-9693-a81101684b62\/82940ea7-8c22-4eab-bce4-a9170043d325_compose-mail---peternewmancsh@gmail.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>These two curves let me calculate the Noise Reduction from the steel plate, which is the difference in SPL on each side, but I want to calculate the Transmission Loss.<\/p>\n<p><\/p>\n<p>When I try to define a Port on the steel faces, I can&#8217;t.&nbsp; If I define Ports at the speaker and anechoic ends of the air duct, The Transmission Loss result won&#8217;t accept them.&nbsp; How do I calculate the Transmission Loss, which is defined below?<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3e825b35-df61-45f5-9693-a81101684b62\/b9f5f7f2-1a17-4b33-8841-a8fb002f53d5_2018-06-09-22-48-58-scn-0005.pdf---adobe-acrobat-reader-dc.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Attached is an ANSYS 19.1 archive<\/p>\n","protected":false},"template":"","class_list":["post-29660","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["1829"],"_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":["1","1","1","1","1"],"_btv_view_count":["2409"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["29660"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","156586"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["60407"],"_bbp_last_active_id":["60407"],"_bbp_last_active_time":["2018-07-14 13:55:41"]},"test":"peteroznewman"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/29660","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\/29660\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=29660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}