{"id":{"repo_id":"missouri","oai_identifier":"oai:mospace.umsystem.edu:10355/66206"},"canonical_url":"https://search.dev.ndltd.org/etd/missouri/oai:mospace.umsystem.edu:10355/66206","repository":{"repo_id":"missouri","name":"University of Missouri","base_url":"https://mospace.umsystem.edu/oai/request"},"display":{"title":"Study on single and double layers micro-perforated panel absorbers and optimal design by genetic algorithm","abstract":"[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT AUTHOR'S REQUEST.] Base on Maa's general theory of micro-perforated panel absorber, the acoustic absorption performance of single and double layers MPP absorbers are investigated. The analytical formula for calculating the absorption coefficient of single and double layers micro-perforated panel are derived by the equivalent circuit method. Meanwhile, sound absorption characteristics of MPP absorber is determined by its structure parameters such as orifice diameter, panel thickness, the perforation ratio, and the depth of the backed air cavity. The influence rule of the variation of the structure parameters on the absorption performance has been studied through numerical simulation with Matlab software. Compared with single structure, the double layers MPP absorber improve the absorption frequency bandwidth effectively. Finally, optimize the double layers MPP absorber's structure parameters by genetic algorithm method. The optimization result improved the average absorption coefficient, and broad frequency absorption bandwidth remarkably at the same time.","abstract_html":"[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT AUTHOR'S REQUEST.] Base on Maa's general theory of micro-perforated panel absorber, the acoustic absorption performance of single and double layers MPP absorbers are investigated. The analytical formula for calculating the absorption coefficient of single and double layers micro-perforated panel are derived by the equivalent circuit method. Meanwhile, sound absorption characteristics of MPP absorber is determined by its structure parameters such as orifice diameter, panel thickness, the perforation ratio, and the depth of the backed air cavity. The influence rule of the variation of the structure parameters on the absorption performance has been studied through numerical simulation with Matlab software. Compared with single structure, the double layers MPP absorber improve the absorption frequency bandwidth effectively. Finally, optimize the double layers MPP absorber's structure parameters by genetic algorithm method. The optimization result improved the average absorption coefficient, and broad frequency absorption bandwidth remarkably at the same time.","abstract_has_math":false,"creators":["Yang, Huijun"],"institution":"University of Missouri--Columbia","degree_name":"M.S.","degree_level":"Masters","degree_discipline":"Mechanical and aerospace engineering (MU)","degree_department":null,"school":null,"contributors":[],"advisors":["Huang, Guoliang"],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018","date_published":"2018","updated_at":"2026-07-24T03:08:43Z","subjects":[],"languages":["eng","English"],"rights":["Access to files is limited to the University of Missouri--Columbia with SSO login."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://doi.org/10.32469/10355/66206"],"render_values":[{"text":"https://doi.org/10.32469/10355/66206","href":"https://doi.org/10.32469/10355/66206","code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/10355/66206","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Huang, Guoliang"]},{"key":"dc:creator","label":"Author","values":["Yang, Huijun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-10-10T00:53:13Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2018-10-10T00:53:13Z"]},{"key":"dc:date.issued","label":"Date","values":["2018"]},{"key":"dc:publisher","label":"Institution","values":["University of Missouri--Columbia"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical and aerospace engineering (MU)"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Missouri--Columbia"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Access to files is limited to the University of Missouri--Columbia with SSO login."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10355/66206","https://doi.org/10.32469/10355/66206"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT AUTHOR'S REQUEST.] Base on Maa's general theory of micro-perforated panel absorber, the acoustic absorption performance of single and double layers MPP absorbers are investigated. The analytical formula for calculating the absorption coefficient of single and double layers micro-perforated panel are derived by the equivalent circuit method. Meanwhile, sound absorption characteristics of MPP absorber is determined by its structure parameters such as orifice diameter, panel thickness, the perforation ratio, and the depth of the backed air cavity. The influence rule of the variation of the structure parameters on the absorption performance has been studied through numerical simulation with Matlab software. Compared with single structure, the double layers MPP absorber improve the absorption frequency bandwidth effectively. Finally, optimize the double layers MPP absorber's structure parameters by genetic algorithm method. The optimization result improved the average absorption coefficient, and broad frequency absorption bandwidth remarkably at the same time."]},{"key":"dc:title","label":"Title","values":["Study on single and double layers micro-perforated panel absorbers and optimal design by genetic algorithm"]}]}],"canonical_facts":{"dc:contributor.advisor":["Huang, Guoliang"],"dc:creator":["Yang, Huijun"],"dc:date.accessioned":["2018-10-10T00:53:13Z"],"dc:date.available":["2018-10-10T00:53:13Z"],"dc:date.issued":["2018"],"dc:description.abstract":["[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT AUTHOR'S REQUEST.] Base on Maa's general theory of micro-perforated panel absorber, the acoustic absorption performance of single and double layers MPP absorbers are investigated. The analytical formula for calculating the absorption coefficient of single and double layers micro-perforated panel are derived by the equivalent circuit method. Meanwhile, sound absorption characteristics of MPP absorber is determined by its structure parameters such as orifice diameter, panel thickness, the perforation ratio, and the depth of the backed air cavity. The influence rule of the variation of the structure parameters on the absorption performance has been studied through numerical simulation with Matlab software. Compared with single structure, the double layers MPP absorber improve the absorption frequency bandwidth effectively. Finally, optimize the double layers MPP absorber's structure parameters by genetic algorithm method. The optimization result improved the average absorption coefficient, and broad frequency absorption bandwidth remarkably at the same time."],"dc:identifier.uri":["https://hdl.handle.net/10355/66206","https://doi.org/10.32469/10355/66206"],"dc:language":["English"],"dc:language.iso":["eng"],"dc:publisher":["University of Missouri--Columbia"],"dc:rights":["Access to files is limited to the University of Missouri--Columbia with SSO login."],"dc:title":["Study on single and double layers micro-perforated panel absorbers and optimal design by genetic algorithm"],"dc:type":["Thesis"],"thesis:degree_discipline":["Mechanical and aerospace engineering (MU)"],"thesis:degree_level":["Masters"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Missouri--Columbia"]},"updated_at":"2026-07-24T03:08:43Z"}