Vibration Characteristics of Stepped Thickness Circular Cylindrical Piezoelectric Shells for Ultrasound Amplifications

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aut.embargoYesen_NZ
aut.filerelease.date2025-10-18
aut.thirdpc.containsNoen_NZ
dc.contributor.advisorAl-Jumaily, Ahmed
dc.contributor.authorMeshkinzar, Ata
dc.date.accessioned2018-10-18T00:06:35Z
dc.date.available2018-10-18T00:06:35Z
dc.date.copyright2018
dc.date.issued2018
dc.date.updated2018-10-17T03:30:36Z
dc.description.abstractThis research investigates the vibration characteristics of stepped-thickness cylindrical shells with a specific application to ultrasound power amplifications for water particle disintegration. One of the main purposes is to develop an ultrasound transducer with large acoustic power and relatively small power consumption. Stepped-thickness variations are introduced to develop alternative thick-thin regions and then large localized vibration amplitudes within the transducer to maximise the acoustic field for the same driving power input. The curvature of the cylindrical shell combined with piezoelectricity and the localized vibration constructive interferences at the centreline of the transducer work together to enhance the resultant focused acoustic field. This work led to a transducer which generates an acoustic field with approximately double acoustic pressure for the same power supply as compared with a uniform-thickness transducer. Computer simulation as well as experimental investigation are used to optimise the performance of this transducer. The transducer was successfully used to disintegrate water droplets to smaller sizes. It is anticipated that this finding will be implemented to disintegrate particles for various applications including biomedical humidification for lung supportive devices.en_NZ
dc.identifier.urihttps://hdl.handle.net/10292/11884
dc.language.isoenen_NZ
dc.publisherAuckland University of Technology
dc.rights.accessrightsOpenAccess
dc.subjectVibration characteristicsen_NZ
dc.subjectStepped thicknessen_NZ
dc.subjectPiezoelectric shellsen_NZ
dc.subjectUltrasound amplificationsen_NZ
dc.titleVibration Characteristics of Stepped Thickness Circular Cylindrical Piezoelectric Shells for Ultrasound Amplificationsen_NZ
dc.typeThesisen_NZ
thesis.degree.grantorAuckland University of Technology
thesis.degree.levelDoctoral Theses
thesis.degree.nameDoctor of Philosophyen_NZ
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