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Kinematic parameters is the way by which coefficient of restitution change with angle of impact.
The ratio of a boulder's velocities or energy prior to and following its impact with the slope is represented by the coefficient of restitution, which is a dimensionless number. Different definitions of the coefficient of restitution have been put forth in earlier studies, but it has not been determined which definition is better suitable for predicting rockfall.
The determination of suitable values for the coefficients of restitution, which often change with the kinematic parameters and terrain conditions, is essential for the accuracy of a computer program modelling a rockfall trajectory. Using small-scale laboratory testing, the effects of the impact angle with regard to the slope on the coefficients of restitution have been identified and analyzed. to determine the validity of the current conclusion based on limited laboratory testing.
This study conducted a medium-scale laboratory test employing spherical limestone polyhedrons impacting concrete slabs to determine how the impact angle affects the coefficients of restitution when the test scale is changed. A 3D motion capture system measures the velocities before and after the collision during free fall tests. Several general laws apply when taking into account the impact angle's effect, regardless of the test scales and conditions, according to the results comparison between our test and the existing small-scale tests. The normal coefficient of restitution (Rn), the kinematic coefficient of restitution Rv, and the kinetic energy coefficient of restitution Re will all decrease as the impact angle increases.
In contrast, it will cause Rt's tangential coefficient of restitution to increase. The impact of the impact angle is significantly influenced by the rotation. The normal coefficient of restitution Rn and tangential coefficient of restitution Rt are always higher when more kinetic energy is converted to rotational energy.
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