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ÖÐͼ·ÖÀàºÅ£ºTH122        ÎÄÏ×±êʶÂ룺A              ÎÄÕ±àºÅ£º1006£­0316 (2012) 04£­0060£­04

LU Ting-ting£¬ZENG Yong£¬XIE Liang-xi£¬XIONG Wei£¬CHEN Qian-kang

£¨Wuhan University of Science and Technology£¬Wuhan 430081£¬China£©

Abstract£ºIn order to improve the energy utilization, a pendulum-ball perpetuum mobile is designed in this paper. In order to reduce the energy loss and make the simple pendulum swing back and forth as long as possible, in the selection of the orbit, through the calculation of the efficiency ,we find that if the ball begins to fall from the highest point of one side of the curve orbit to the highest point of the other side via the lowest point, the height of the cycloid orbit, the parabolic orbit and the circular arc orbit are respectively 0.88,0.77and0.61. Given that the difference of the three numerical value is not significant, through the analysis of the processing economy of the curve orbit ,we find that the machining of the cycloid orbit is more difficult and expensive than the circular arc orbit, and that the latter one can attain good effect through general-purpose machine tool.So we make a comprehensive consideration and determine the circular arc orbit. In order to realize the energy exchange of the ball, we choose two equiponderant balls on the basis of the requirement of perfect elastic collision. The fact that the contact area of the V-groove and the ball is smaller than others means that its energy consumption is smaller. Furthermore,the ball can move more steadily in the V-groove. Comparing the oscillating bar and the string,we find that the computational error of the oscillating bar is larger than the string and that adopting the string can avoid the use of the bearing. When the ball's initial velocity is 0 in the physical model and pull to put a horizontal position as the starting position whereabouts, the hitting times is four and the time of swing back and forth is 12.8 s.