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dc.contributor.authorJames, Danielen_US
dc.contributor.authorWixted, Andrewen_US
dc.contributor.editorAleksandar Subic, Franz Konstantin Fuss, Firoz Alam and Patrick Cliftonen_US
dc.date.accessioned2017-05-03T12:29:19Z
dc.date.available2017-05-03T12:29:19Z
dc.date.issued2011en_US
dc.date.modified2013-05-30T04:06:27Z
dc.identifier.issn1877-7058en_US
dc.identifier.doi10.1016/j.proeng.2011.05.120en_US
dc.identifier.urihttp://hdl.handle.net/10072/45829
dc.description.abstractThe "style" aspect of the parachuting sports of "style and accuracy" involves a parachutist diving earthward to gain maximum speed, tucking into a crouch position and performing a sequence of whole body rotations. The scoring of the rotations depends on the overall speed of the performance and the technical purity of the rotations. Given the cost and the 3000 m (10,000 ft) altitude location of the style activities, a parachutist practicing style activities has little opportunity for feedback on their training jumps. This paper investigates the usefulness of inertial sensors in the recording, analysis and provision of timely feedback for style activities. Several different sensors were used to collect data at different times. Some trials were collected with triaxial accelerometers coupled with single axis rate-gyroscopes and others with combinations of triaxial accelerometers, gyroscopes and magnetic sensors. Initial analysis of accelerometer outputs clearly showed key parachuting events such as entering free-fall, arriving at terminal velocity and the parachute opening. Rotations in the horizontal plane and the sequence of rotations were very clear in the gyroscope signal but for rotations in the vertical plane, both accelerometers and gyroscopes contained significant noise. Using triaxial gyroscopes, the vertical rotation became more clearly defined. The existence of tangential and centrifugal acceleration due to the offset between the sensor position and the axis of rotation provided a method of detecting the sensor orientation relative to the axis of rotation as well as determining an estimate of the offset distance. The gyroscope outputs not only provided an easily interpreted record of the turn sequence but other information on the technique such as the performing of an off-axis back loop or the beginning of a back loop while still completing the preceding turn. Additional data is currently being collected with newer devices to develop algorithms to determine the angles of undershoot and overshoot on a turn or back loop and the angle of off-axis rotation.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_US
dc.format.extent1040099 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_US
dc.publisherElsevieren_US
dc.publisher.placeNetherlandsen_US
dc.relation.ispartofstudentpublicationNen_US
dc.relation.ispartofpagefrom493en_US
dc.relation.ispartofpageto500en_US
dc.relation.ispartofjournalProcedia Engineeringen_US
dc.relation.ispartofvolume13en_US
dc.rights.retentionYen_US
dc.subject.fieldofresearchHuman Movement and Sports Science not elsewhere classifieden_US
dc.subject.fieldofresearchcode110699en_US
dc.titleInertial monitoring of style & accuracy at 10,000 feeten_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightCopyright 2011 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.en_US
gro.date.issued2011
gro.hasfulltextFull Text


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