English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this article, we investigate the behavior of the coefficient ofrestitution (COR) which is an important parameter in many impact-relatedfields. In many cases, the COR is considered as a constant value, but it variesaccording to many variables. In this paper, we introduce an analytical variableCOR model considering aero dynamics along with its verification throughexperiment. To introduce and analyze the variable characteristic of the CORmodel, the collision phenomenon between a pendulum and two kinds of ball isemployed as an example and aerodynamics such as drag force is considered foranalyzing the after-effect of the collision. Collision velocity of thependulum, dynamic parameters of colliding bodies, contact time, dragcoefficient, the air density, and the cross-sectional area of the ball arefound as the typical variables of analytical COR model. This observationgeneralizes the result in previous researches. To verify new COR model, thetravel distances for the curve-fitted constant COR model and the curve-fittedvariable COR model are compared through simulation and experiment. Moreover,comparison between constant COR and variable COR is presented in several pointof views. Finally, using the variable COR model, the travel distance of theball for collision velocity, which is beyond the curve-fitted range, isestimated.

Analytic Model of Variable Characteristic of Coefficient of Restitution and Its Application to Soccer Ball Trajectory Planning