{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19087"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19087","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The influences of string tension and frame stiffness on racquet and ball motions, and on impact loads at the elbow joint during the tennis backhand drive","abstract":"The motion of the ball and frame during and just after impact was inferred from the acceleration-time change of an accelerometer instrumented impactor pendulum, and the strain-time change of the frame during the clamped racket impact. The impulsive loads acting on the elbow joint were estimated by adopting an inverse dynamic analysis (impulse-momentum equation) for the racket and forearm during the backhand drive.","abstract_html":"The motion of the ball and frame during and just after impact was inferred from the acceleration-time change of an accelerometer instrumented impactor pendulum, and the strain-time change of the frame during the clamped racket impact. The impulsive loads acting on the elbow joint were estimated by adopting an inverse dynamic analysis (impulse-momentum equation) for the racket and forearm during the backhand drive.","abstract_has_math":false,"creators":["Shin, In-Sik"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Kinesiology","degree_department":null,"school":null,"contributors":["Groppel, J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T11:56:32Z","date_published":"2011-05-07T11:56:32Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Applied Mechanics","Education, Physical","Engineering, Biomedical"],"languages":["eng"],"rights":["Copyright 1989 Shin, In-Sik"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9011021","(UMI)AAI9011021"],"render_values":[{"text":"AAI9011021","href":null,"code":true},{"text":"(UMI)AAI9011021","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19087","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Groppel, J."]},{"key":"dc:creator","label":"Author","values":["Shin, In-Sik"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T11:56:32Z","10000-01-01","1989"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Kinesiology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"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":["Applied Mechanics","Education, Physical","Engineering, Biomedical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1989 Shin, In-Sik"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9011021","(UMI)AAI9011021","http://hdl.handle.net/2142/19087"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The motion of the ball and frame during and just after impact was inferred from the acceleration-time change of an accelerometer instrumented impactor pendulum, and the strain-time change of the frame during the clamped racket impact. The impulsive loads acting on the elbow joint were estimated by adopting an inverse dynamic analysis (impulse-momentum equation) for the racket and forearm during the backhand drive.","The stiffness and string tension conditions tested in the experiment were 5450 and 7540 N/m crossed with 178,245, and 311 N, respectively for the two phases of tests. Generally, the impulse of the first acceleration spike was not consistently affected by the string tension and frame stiffness. However, at the slowest impact speed, high string tension and flexible frame significantly reduced the impulse on the ball. This specific result was partly consistent with the impulse measured in actual backhand drive impact where only the tighter string reduced the impulse applied to the ball. Although the mean impulses produced by the stiff frame were larger than those by flexible frame at the tested string tensions, the difference was not significant.","The mean linear and angular impulses acting on the elbow joint during backhand drive were 0.804 N $\\cdot$ sec and 0.416 N $\\cdot$ sec, respectively, with large variability in the measures. The approximated peak impulsive force and moment was 144 N and 78 Nm respectively. The effect of different string tension and frame stiffness on the impulsive loads at the elbow joint during backhand drive was not significant.","Recommendations. A lighter impactor would improve the applicability of the impactor pendulum results to actual racket and ball interaction. A set of 3-D impulse-momentum equations need to be developed for incorporation into 3-D motion analysis.","Made available in DSpace on 2011-05-07T11:56:32Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9011021.pdf: 4615865 bytes, checksum: e08a2bbc90af1cdbe79144fcf055dbaf (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:34:34Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:16-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["The influences of string tension and frame stiffness on racquet and ball motions, and on impact loads at the elbow joint during the tennis backhand drive"]}]}],"canonical_facts":{"dc:contributor":["Groppel, J."],"dc:creator":["Shin, In-Sik"],"dc:date":["2011-05-07T11:56:32Z","10000-01-01","1989"],"dc:description":["The motion of the ball and frame during and just after impact was inferred from the acceleration-time change of an accelerometer instrumented impactor pendulum, and the strain-time change of the frame during the clamped racket impact. The impulsive loads acting on the elbow joint were estimated by adopting an inverse dynamic analysis (impulse-momentum equation) for the racket and forearm during the backhand drive.","The stiffness and string tension conditions tested in the experiment were 5450 and 7540 N/m crossed with 178,245, and 311 N, respectively for the two phases of tests. Generally, the impulse of the first acceleration spike was not consistently affected by the string tension and frame stiffness. However, at the slowest impact speed, high string tension and flexible frame significantly reduced the impulse on the ball. This specific result was partly consistent with the impulse measured in actual backhand drive impact where only the tighter string reduced the impulse applied to the ball. Although the mean impulses produced by the stiff frame were larger than those by flexible frame at the tested string tensions, the difference was not significant.","The mean linear and angular impulses acting on the elbow joint during backhand drive were 0.804 N $\\cdot$ sec and 0.416 N $\\cdot$ sec, respectively, with large variability in the measures. The approximated peak impulsive force and moment was 144 N and 78 Nm respectively. The effect of different string tension and frame stiffness on the impulsive loads at the elbow joint during backhand drive was not significant.","Recommendations. A lighter impactor would improve the applicability of the impactor pendulum results to actual racket and ball interaction. A set of 3-D impulse-momentum equations need to be developed for incorporation into 3-D motion analysis.","Made available in DSpace on 2011-05-07T11:56:32Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9011021.pdf: 4615865 bytes, checksum: e08a2bbc90af1cdbe79144fcf055dbaf (MD5) Previous issue date: 1989","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:34:34Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:16-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9011021","(UMI)AAI9011021","http://hdl.handle.net/2142/19087"],"dc:language":["eng"],"dc:rights":["Copyright 1989 Shin, In-Sik"],"dc:subject":["Applied Mechanics","Education, Physical","Engineering, Biomedical"],"dc:title":["The influences of string tension and frame stiffness on racquet and ball motions, and on impact loads at the elbow joint during the tennis backhand drive"],"dc:type":["text"],"thesis:degree_discipline":["Kinesiology"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:12Z"}