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Analytical model of variable characteristic of coefficient of restitution and its application to ball trajectory planning

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Abstract

In this article, we investigate the behavior of the coefficient of restitution (COR) which is an important parameter in many impact-related fields. In many cases, the COR is considered as a constant value, but it varies according to many variables. In this paper, we introduce an analytical variable COR model considering aerodynamics along with its verification through experiment. To introduce and analyze the variable characteristic of the COR model, the collision phenomenon between a pendulum and two kinds of ball is employed as an example and aerodynamics such as drag force is considered for analyzing the after-effect of the collision. Collision velocity of the pendulum, dynamic parameters of colliding bodies, contact time, drag coefficient, the air density, and the cross-sectional area of the ball are found as the typical variables of analytical COR model. This observation generalizes the result in previous researches. To verify new COR model, the travel distances for the curve-fitted constant COR model and the curve-fitted variable COR model are compared through simulation and experiment. Moreover, comparison between constant COR and variable COR is presented in several points of view. Finally, using the variable COR model, the travel distance of the ball for given collision velocity can be estimated.

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Abbreviations

\(\tilde{\underline{F}}_\mathrm{{ext}}\) :

External impulse

\({\underline{F}}_\mathrm{{ext}}\) :

External force

\(\Delta t\) :

Contact time during collision

e :

Coefficient of restitution (COR)

n :

Contact time during collision

\(v_M \) :

Absolute velocity of the manipulator

\(v_B \) :

Absolute velocity of the environment

\(\Delta v_M \) :

Velocity variation of the manipulator after collision

\(\Delta v_B \) :

Velocity variation of the environment after collision

\(F_D \) :

The magnitude of the drag force

\(\rho \) :

Density of the air \((1.226\,\mathrm{{kg}}/\mathrm{{m}}^{3}\) in \(15\,^{\circ }\mathrm{{C}}, 1013\,\mathrm{{hpa}}\))

S :

The cross-sectional area of the ball

\(C_D \) :

Coefficient of the drag force

\(v_\mathrm{{air}}\) :

The relative velocity of the air with respect to the ball

\(N_\mathrm{{Red}}\) :

Reynolds number which is the ratio of the inertial force to the viscous force

V :

The average velocity of the air (if there is no wind, \(V=v_\mathrm{{air}})\)

D :

The diameter of the ball

\(\mu \) :

The coefficient of the air viscosity (\(1.83\times 10^{-5}\mathrm{{kg}}/\mathrm{{m}}\,\mathrm{{s}}\) in \(15\,^{\circ }\mathrm{{C}})\)

\(F_\mathrm{{mag}} \) :

The force caused by the Magnus effect

\(C_\mathrm{{mag}}(C_L)\) :

The coefficient caused by the Magnus effect

Sp :

Spin parameter

w :

The angular velocity of the ball

r :

The radius of the ball

\(M_E \) :

Effective mass of the impacting pendulum at the position of impact

M :

The mass attached to the distal end of the pendulum

m :

The mass of the pendulum bar

\(l(=L_E)\) :

The length of the pendulum bar

\(\underline{{\varvec{\upsilon }}}_B^0\) :

Velocity of the ball before the impact

\(\underline{{\varvec{\upsilon }}}_M^0\) :

The velocity of the pendulum before the impact

\({\varvec{\upsilon }}_M^\mathrm{{avg}}\) :

The average velocity of the pendulum during the period of impact \(({=}{({\varvec{\upsilon }}_{M}^{0} +{\varvec{\upsilon }}_{M})}/2)\)

\(h_{s}\) :

Height of the supporter

\(\theta _1 \) :

The back swing angle for initial setting

\(\theta _2 \) :

The forward swing angle after the impact (\(\theta _1 >\theta _2 )\)

\(w_1 \) :

The angular velocity of the pendulum immediately before the impact

\(w_2 \) :

The angular velocity of the pendulum immediately after the impact

\(E_\mathrm{{loss}} \) :

Energy loss

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Acknowledgments

This work was supported by the Technology Innovation Program (10040097) funded by the Ministry of Trade, Industry and Energy Republic of Korea (MOTIE, Korea), supported by Mid-career Researcher Program through NRF grant funded by the MEST(NRF-2013 R1A2A2A01068814), supported by the Technology Innovation Program (10052980, Development of microrobotic system for surgical treatment of chronic total occlusion) funded By the Ministry of Trade, Industry & Energy(MI, Korea), and supported by the Technology Innovation Program (10049789, Steering and driving mechanism for Cardio-vascular intervention procedure) funded By the Ministry of Trade, Industry & Energy (MI, Korea). This work performed by ICT-based Medical Robotic Systems Team of Hanyang University, Department of Electronic Systems Engineering was supported by the BK21 Plus Program funded by National Research Foundation of Korea (NRF).

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Ryu, HT., Yi, BJ. & Kwon, Y.H. Analytical model of variable characteristic of coefficient of restitution and its application to ball trajectory planning. Intel Serv Robotics 10, 13–29 (2017). https://doi.org/10.1007/s11370-016-0206-5

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