Rigid wall effects an softball coefficient of restitution measurements

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Bibliographische Detailangaben
Deutscher übersetzter Titel:Eine harte Wand beeinflusst den Rückstellungskoeffizienten des Softballs
Autor:Smith, Lloyd; Ison, Aaron
Erschienen in:The engineering of sport 6. Volume 1: Developments for sports : Proceedings of the ISEA 2006 - Munich, Germany
Veröffentlicht:New York (N.Y.): Springer (Verlag), 2006, S. 29-34, Lit.
Forschungseinrichtung:International Sports Engineering Association
Format: Literatur (SPOLIT)
Publikationstyp: Sammelwerksbeitrag
Medienart: Gedruckte Ressource
Sprache:Englisch
Schlagworte:
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Erfassungsnummer:PU200809003057
Quelle:BISp

Abstract

The coefficient of restitution (COR) is often measured by impacting a ball against a rigid wall. The ball COR is used to regulate performance in many sports. In the case of ball impact sports, such as baseball and softball, the ball COR also contributes to bat performance. Understanding the accuracy of the ball COR has received greater scrutiny as bat performance tests have been refined and performance limits lowered. The effect of the idealized rigid wall surface was considered in this study by impacting softballs against flat surfaces of controlled stiffness. The ball COR was generally observed to decrease as the impact surface stiffness increased. An exception to this observation was found for the thinnest impact plate (6 mm) which provided the lowest COR value in this study. Only impact surfaces of relatively large compliance were observed to affect the measured ball COR. The affect of the distance of the rigid wall from the speed measurement due to drag was also considered. The common distance of 450 min was shown to report a ball COR that is approximately 0.005 lower than would be obtained by measuring the ball speed at the impact surface. Verf.-Referat