{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:61507"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:61507","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Tools for the professional development of horn loudspeakers","abstract":"This thesis deals with methods for the professional development of horn loudspeakers. The basic idea is to separately describe the acoustic source (horn driver) and the device to guide the wave (horn or wave guide). The separate description of both systems allows one to freely combine the data of any driver and horn which yields an enormous flexibility when developing new driver/horn combinations. At first, it is investigated by measurements which properties of the sound wave can be found at the common interface between driver and horn. Different driver/horn combinations are analysed by decomposing the pressure and velocity profiles into orthogonal eigenfunctions. Based on the practical measurement results, several modal models for the interface are derived. On the one hand, the models must be capable to describe the three-dimensional properties of the sound wave at the interface. On the other hand, it must be possible to measure or calculate the model's parameters in practice. Then, it is described how the modal horn parameters are calculated using numerical methods (Boundary Element Method) combined with modal excitation and decomposition. The driver's parameters are acquired using a particular measurement technique. Additionally to the linear modal modelling, a method to calculate harmonic distortion in horn loudspeaker is developed and verified. Finally, it is demonstrated how to use the methods in practice. A complete development process of a horn loudspeaker is described and the results are verified by measurements. The practical relevance of the methods results not only from the high accuracy, but also from the effective application when developing horn loudspeakers.","abstract_html":"This thesis deals with methods for the professional development of horn loudspeakers. The basic idea is to separately describe the acoustic source (horn driver) and the device to guide the wave (horn or wave guide). The separate description of both systems allows one to freely combine the data of any driver and horn which yields an enormous flexibility when developing new driver/horn combinations. At first, it is investigated by measurements which properties of the sound wave can be found at the common interface between driver and horn. Different driver/horn combinations are analysed by decomposing the pressure and velocity profiles into orthogonal eigenfunctions. Based on the practical measurement results, several modal models for the interface are derived. On the one hand, the models must be capable to describe the three-dimensional properties of the sound wave at the interface. On the other hand, it must be possible to measure or calculate the model's parameters in practice. Then, it is described how the modal horn parameters are calculated using numerical methods (Boundary Element Method) combined with modal excitation and decomposition. The driver's parameters are acquired using a particular measurement technique. Additionally to the linear modal modelling, a method to calculate harmonic distortion in horn loudspeaker is developed and verified. Finally, it is demonstrated how to use the methods in practice. A complete development process of a horn loudspeaker is described and the results are verified by measurements. The practical relevance of the methods results not only from the high accuracy, but also from the effective application when developing horn loudspeakers.","abstract_has_math":false,"creators":["Makarski, Michael"],"institution":"Logos","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Vorländer, Michael"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2006,"date_issued":"2006","date_published":"2006","updated_at":"2026-07-30T19:43:10Z","subjects":["info:eu-repo/classification/ddc/620","Ingenieurwissenschaften","Lautsprecher","Randelemente-Methode","BEM","Moden","Horn","Modal","Simulation","Numerical"],"languages":["eng"],"rights":["info:eu-repo/semantics/openAccess"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123167%22"],"render_values":[{"text":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123167%22","href":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123167%22","code":true}]}]},"links":{"outbound_url":"https://publications.rwth-aachen.de/record/61507","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Vorländer, Michael"]},{"key":"dc:creator","label":"Author","values":["Makarski, Michael"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:coverage","label":"Dc Coverage","values":["DE"]},{"key":"dc:date","label":"Dc Date","values":["2006"]},{"key":"dc:publisher","label":"Institution","values":["Logos"]},{"key":"dc:relation","label":"Dc Relation","values":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-15573","info:eu-repo/semantics/altIdentifier/issn/1866-3052","info:eu-repo/semantics/altIdentifier/isbn/3-8325-1280-2"]},{"key":"dc:type","label":"Dc Type","values":["info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["info:eu-repo/classification/ddc/620","Ingenieurwissenschaften","Lautsprecher","Randelemente-Methode","BEM","Moden","Horn","Modal","Simulation","Numerical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/record/61507","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123167%22"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis deals with methods for the professional development of horn loudspeakers. The basic idea is to separately describe the acoustic source (horn driver) and the device to guide the wave (horn or wave guide). The separate description of both systems allows one to freely combine the data of any driver and horn which yields an enormous flexibility when developing new driver/horn combinations. At first, it is investigated by measurements which properties of the sound wave can be found at the common interface between driver and horn. Different driver/horn combinations are analysed by decomposing the pressure and velocity profiles into orthogonal eigenfunctions. Based on the practical measurement results, several modal models for the interface are derived. On the one hand, the models must be capable to describe the three-dimensional properties of the sound wave at the interface. On the other hand, it must be possible to measure or calculate the model's parameters in practice. Then, it is described how the modal horn parameters are calculated using numerical methods (Boundary Element Method) combined with modal excitation and decomposition. The driver's parameters are acquired using a particular measurement technique. Additionally to the linear modal modelling, a method to calculate harmonic distortion in horn loudspeaker is developed and verified. Finally, it is demonstrated how to use the methods in practice. A complete development process of a horn loudspeaker is described and the results are verified by measurements. The practical relevance of the methods results not only from the high accuracy, but also from the effective application when developing horn loudspeakers."]},{"key":"dc:source","label":"Dc Source","values":["Berlin : Logos, Aachener Beiträge zur technischen Akustik [4], VIII, 162 S. : Ill., graph. Darst. (2006). = Zugl.: Aachen, Techn. 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Based on the practical measurement results, several modal models for the interface are derived. On the one hand, the models must be capable to describe the three-dimensional properties of the sound wave at the interface. On the other hand, it must be possible to measure or calculate the model's parameters in practice. Then, it is described how the modal horn parameters are calculated using numerical methods (Boundary Element Method) combined with modal excitation and decomposition. The driver's parameters are acquired using a particular measurement technique. Additionally to the linear modal modelling, a method to calculate harmonic distortion in horn loudspeaker is developed and verified. Finally, it is demonstrated how to use the methods in practice. A complete development process of a horn loudspeaker is described and the results are verified by measurements. 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