Experimental study of oblique impacts with initial spin

被引:107
作者
Dong, H [1 ]
Moys, MH [1 ]
机构
[1] Univ Witwatersrand, Sch Proc & Mat Engn, ZA-2050 Johannesburg, South Africa
关键词
impact; collision; coefficient of restitution; angular velocity; video processing; image analysis;
D O I
10.1016/j.powtec.2005.05.046
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
An experiment to measure the properties of the impacts between of a 44.5 mm steel ball and a steel flat surface is reported. The apparatus can release the ball with and without initial spin. The steel target can be inclined 0-60 degrees. The impact event is recorded with a digital video camera. The video analysis is computer based and all the distortions of image are calibrated. The impact properties measured are expressed as coefficient of normal restitution e(n), coefficient of tangential restitution e(t), impulse ratio or dynamic coefficient of friction f, angular velocity, and rebound angle of the contact point. It is found that the measurement of oblique impact without initial spin shows close agreement with recent published results and complies with rigid body theory. However, the experimental results of oblique impact with pre-impact spin do not agree to the collision models in rolling or micro-slip regime in particular. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:22 / 31
页数:10
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