{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/97633"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/97633","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Quantification and analysis methods aimed at the reduction of flow induced noise in the expansion device","abstract":"Embargo set by: Colleen Fallaw for item 102686 Lift date: 2019-08-10T21:25:30Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","abstract_html":"Embargo set by: Colleen Fallaw for item 102686 Lift date: 2019-08-10T21:25:30Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","abstract_has_math":false,"creators":["Santambrogio, Andrea"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Elbel, Stefan"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-08-10T19:52:23Z","date_published":"2017-08-10T19:52:23Z","updated_at":"2026-07-22T22:24:34Z","subjects":["Expansion valve","Noise"],"languages":["en"],"rights":["Copyright 2017 Andrea Santambrogio"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/97633","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Elbel, Stefan"]},{"key":"dc:creator","label":"Author","values":["Santambrogio, Andrea"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-08-10T19:52:23Z","2019-08-11T09:15:35Z","2017-04-27","2017-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Expansion valve","Noise"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Andrea Santambrogio"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/97633"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Embargo set by: Colleen Fallaw for item 102686 Lift date: 2019-08-10T21:25:30Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 102686 on 2019-08-11T09:15:35Z.","A cultural context where acoustic technologies are rapidly growing, and the demand for comfort is increasing exponentially, were all catalysts for the birth of this research project. In particular, noise is one of the major concerns that many companies want to come against, especially in the HVAC & Refrigeration sector. Indeed, noise coming from air conditioning systems can be perceived as very annoying. Thus, one of the main reasons this research is conducted is to increase consumer comfort in all applications where air conditioning noise, especially noise coming from expansion devices, is perceived as very disturbing. At the same time another motivation to conduct research in this area is to improve the understanding of flow induced noise. The objective of the thesis is to provide a basis for future scientists who would like to come against the problem of noise produced from expansion devices. Basic theories regarding noise and expansion devices are defined and explained. Subsequently the thesis demonstrates how the laboratory was designed and setup (the refrigerant used was R134a), including pressure, acceleration, and microphone measurements. The importance of the anechoic chamber will be shown. After it will be revealed the usefulness of the FFT to convert time domain measurements to frequency domain signals for detailed analysis. Initial measurements have been conducted and similarities between pressure and acceleration measurements will be investigated in the frequency range of interest (< 6 kHz). Lastly, preliminary flow visualization results are available to connect flow regimes to noise measurements.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-05-01","The student, Andrea Santambrogio, accepted the attached license on 2017-04-25 at 16:37.","The student, Andrea Santambrogio, submitted this Thesis for approval on 2017-04-25 at 16:44.","This Thesis was approved for publication on 2017-04-27 at 18:39.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11063 on 2017-08-10 at 14:32:37","Made available in DSpace on 2017-08-10T19:52:23Z (GMT). No. of bitstreams: 2 SANTAMBROGIO-THESIS-2017.pdf: 12555146 bytes, checksum: 82853d7887037716a19121d7efa310a2 (MD5) LICENSE.txt: 4216 bytes, checksum: 2c1b662dcc957274425afb8318060d2c (MD5) Previous issue date: 2017-04-27"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Quantification and analysis methods aimed at the reduction of flow induced noise in the expansion device"]}]}],"canonical_facts":{"dc:contributor":["Elbel, Stefan"],"dc:creator":["Santambrogio, Andrea"],"dc:date":["2017-08-10T19:52:23Z","2019-08-11T09:15:35Z","2017-04-27","2017-05"],"dc:description":["Embargo set by: Colleen Fallaw for item 102686 Lift date: 2019-08-10T21:25:30Z Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system","Limited Restriction Lifted for Item 102686 on 2019-08-11T09:15:35Z.","A cultural context where acoustic technologies are rapidly growing, and the demand for comfort is increasing exponentially, were all catalysts for the birth of this research project. In particular, noise is one of the major concerns that many companies want to come against, especially in the HVAC & Refrigeration sector. Indeed, noise coming from air conditioning systems can be perceived as very annoying. Thus, one of the main reasons this research is conducted is to increase consumer comfort in all applications where air conditioning noise, especially noise coming from expansion devices, is perceived as very disturbing. At the same time another motivation to conduct research in this area is to improve the understanding of flow induced noise. The objective of the thesis is to provide a basis for future scientists who would like to come against the problem of noise produced from expansion devices. Basic theories regarding noise and expansion devices are defined and explained. Subsequently the thesis demonstrates how the laboratory was designed and setup (the refrigerant used was R134a), including pressure, acceleration, and microphone measurements. The importance of the anechoic chamber will be shown. After it will be revealed the usefulness of the FFT to convert time domain measurements to frequency domain signals for detailed analysis. Initial measurements have been conducted and similarities between pressure and acceleration measurements will be investigated in the frequency range of interest (< 6 kHz). Lastly, preliminary flow visualization results are available to connect flow regimes to noise measurements.","Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-05-01","The student, Andrea Santambrogio, accepted the attached license on 2017-04-25 at 16:37.","The student, Andrea Santambrogio, submitted this Thesis for approval on 2017-04-25 at 16:44.","This Thesis was approved for publication on 2017-04-27 at 18:39.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11063 on 2017-08-10 at 14:32:37","Made available in DSpace on 2017-08-10T19:52:23Z (GMT). No. of bitstreams: 2 SANTAMBROGIO-THESIS-2017.pdf: 12555146 bytes, checksum: 82853d7887037716a19121d7efa310a2 (MD5) LICENSE.txt: 4216 bytes, checksum: 2c1b662dcc957274425afb8318060d2c (MD5) Previous issue date: 2017-04-27"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/97633"],"dc:language":["en"],"dc:rights":["Copyright 2017 Andrea Santambrogio"],"dc:subject":["Expansion valve","Noise"],"dc:title":["Quantification and analysis methods aimed at the reduction of flow induced noise in the expansion device"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:34Z"}