{"id":287202,"date":"2023-06-05T16:37:27","date_gmt":"2023-06-05T16:37:27","guid":{"rendered":"\/forum\/forums\/topic\/sound-absorption-coefficient\/"},"modified":"2023-06-05T16:37:27","modified_gmt":"2023-06-05T16:37:27","slug":"sound-absorption-coefficient","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/sound-absorption-coefficient\/","title":{"rendered":"Sound absorption coefficient"},"content":{"rendered":"<p>Hello, I am trying to get sound absorption coefficient (SAC) for a single unit Helmholtz resonator. In the attached photo you can see that, I have used PML BC to absorb the radiated sound energy. For sound source I have introduced a port duct (interior port was used) between PML and air. and I calculated the frequency response at the inlet of the resonator. I can not get absorption coefficient as direct output becouse I need an exterior port for that and it is not possible to introduce exterior port in the model.&nbsp;<\/p>\n<p>Actually, I am new in acoustic analysis and I am trying to figure out the exact method to calculate SAC. Could you please give me some idea on how to evaluate SAC from this model. Or do you have any better way to model such system. <img decoding=\"async\" title=\"Harmonic Acoustic model geometry \" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/05-06-2023-1685982728-model.png\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/05-06-2023-1685982804-mceclip0.png\"><\/p>\n<p>&nbsp;<\/p>\n<p>Thank you in advance!<\/p>\n","protected":false},"template":"","class_list":["post-287202","topic","type-topic","status-closed","hentry","topic-tag-absorption-coefficient-1","topic-tag-duct-1","topic-tag-harmonic-acoustics","topic-tag-portsetup-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["2684","88"],"_bbp_author_ip":["23.217.200.71"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["881"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["287202"],"_bbp_forum_id":["27796"],"_bbp_engagement":["88","2684"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["287544"],"_bbp_last_active_id":["287544"],"_bbp_last_active_time":["2023-06-07 13:06:46"]},"test":"rahat-ara-nooriwu-fraunhofer-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/287202","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\/287202\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=287202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}