{"id":{"repo_id":"oxford-brookes","oai_identifier":"tle:1a4e1e9f-d810-4b31-b6d6-e01e76d6e4d7:d6bd9758-527a-46cd-bfe2-c433766e8fca:1"},"canonical_url":"https://search.dev.ndltd.org/etd/oxford-brookes/tle:1a4e1e9f-d810-4b31-b6d6-e01e76d6e4d7:d6bd9758-527a-46cd-bfe2-c433766e8fca:1","repository":{"repo_id":"oxford-brookes","name":"Oxford Brookes University","base_url":"https://radar.brookes.ac.uk/radar/oai"},"display":{"title":"Real-time non-intrusive reed valve measurement and analysis","abstract":"An experimental and theoretical investigation has been undertaken in which a unique method of position measurement has been developed and used to study the real-time behaviour of reed valves in a two-stroke engine. This sensor has allowed the acquisition of high resolution position data, recorded during unstable operating conditions, in a format that is convenient for further analysis. This in turn has provided the opportunity to improve the modelling of reed valves through the development of the forcing function. The sensor uses active infra-red to achieve non-intrusive position measurement and can be attached in close proximity to the reed valve, enabling high common mode rejection of vibration with a resolution of 0.01mm possible. The sensor underwent back to back evaluation with a recognised video stroboscopic method ofreed position measurement during stable operating conditions, during which not only was its own integrity established, but also the limitations of the currently recognised method demonstrated. A set of comparative experiments using different reed types in a range of operating conditions were conducted, with observations on the high resolution data reported. The sensor's ability to record the continuous real-time position of a reed in unstable motion resulted in improved modelling of reed valves through a detailed examination of the forcing function and damping parameters.","abstract_html":"An experimental and theoretical investigation has been undertaken in which a unique method of position measurement has been developed and used to study the real-time behaviour of reed valves in a two-stroke engine. This sensor has allowed the acquisition of high resolution position data, recorded during unstable operating conditions, in a format that is convenient for further analysis. This in turn has provided the opportunity to improve the modelling of reed valves through the development of the forcing function. The sensor uses active infra-red to achieve non-intrusive position measurement and can be attached in close proximity to the reed valve, enabling high common mode rejection of vibration with a resolution of 0.01mm possible. The sensor underwent back to back evaluation with a recognised video stroboscopic method ofreed position measurement during stable operating conditions, during which not only was its own integrity established, but also the limitations of the currently recognised method demonstrated. A set of comparative experiments using different reed types in a range of operating conditions were conducted, with observations on the high resolution data reported. The sensor's ability to record the continuous real-time position of a reed in unstable motion resulted in improved modelling of reed valves through a detailed examination of the forcing function and damping parameters.","abstract_has_math":false,"creators":["Collins, Peter Ralph"],"institution":"Oxford Brookes University","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Hern, Tony","Bremble, G. R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T03:42:22Z","subjects":[],"languages":["en"],"rights":["All rights reserved"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://doi.org/10.24384/qf6b-0e18","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Collins, Peter Ralph","Hern, Tony","Bremble, G. 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This sensor has allowed the acquisition of high resolution position data, recorded during unstable operating conditions, in a format that is convenient for further analysis. This in turn has provided the opportunity to improve the modelling of reed valves through the development of the forcing function. The sensor uses active infra-red to achieve non-intrusive position measurement and can be attached in close proximity to the reed valve, enabling high common mode rejection of vibration with a resolution of 0.01mm possible. The sensor underwent back to back evaluation with a recognised video stroboscopic method ofreed position measurement during stable operating conditions, during which not only was its own integrity established, but also the limitations of the currently recognised method demonstrated. A set of comparative experiments using different reed types in a range of operating conditions were conducted, with observations on the high resolution data reported. The sensor's ability to record the continuous real-time position of a reed in unstable motion resulted in improved modelling of reed valves through a detailed examination of the forcing function and damping parameters."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Real-time non-intrusive reed valve measurement and analysis"]}]}],"canonical_facts":{"dc:contributor":["Collins, Peter Ralph","Hern, Tony","Bremble, G. R."],"dc:creator":["Collins, Peter Ralph"],"dc:description":["An experimental and theoretical investigation has been undertaken in which a unique method of position measurement has been developed and used to study the real-time behaviour of reed valves in a two-stroke engine. This sensor has allowed the acquisition of high resolution position data, recorded during unstable operating conditions, in a format that is convenient for further analysis. This in turn has provided the opportunity to improve the modelling of reed valves through the development of the forcing function. The sensor uses active infra-red to achieve non-intrusive position measurement and can be attached in close proximity to the reed valve, enabling high common mode rejection of vibration with a resolution of 0.01mm possible. The sensor underwent back to back evaluation with a recognised video stroboscopic method ofreed position measurement during stable operating conditions, during which not only was its own integrity established, but also the limitations of the currently recognised method demonstrated. A set of comparative experiments using different reed types in a range of operating conditions were conducted, with observations on the high resolution data reported. The sensor's ability to record the continuous real-time position of a reed in unstable motion resulted in improved modelling of reed valves through a detailed examination of the forcing function and damping parameters."],"dc:format":["application/pdf"],"dc:identifier":["https://doi.org/10.24384/qf6b-0e18","https://radar.brookes.ac.uk/radar/file/1a4e1e9f-d810-4b31-b6d6-e01e76d6e4d7/1/Collins_1994_E15.pdf"],"dc:language":["en"],"dc:publisher":["Oxford Brookes University"],"dc:rights":["All rights reserved"],"dc:title":["Real-time non-intrusive reed valve measurement and analysis"],"dc:type":["thesis"]},"updated_at":"2026-07-24T03:42:22Z"}