A Study on the Mechanism of a Scientific Toy “Girigiri-Garigari”
A Study on the Mechanism of a Scientific Toy “Girigiri-Garigari”
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科学玩具“Girigiri-Garigari”的机理研究
DOI：
10.1143/jjap.34.2745
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发表时间：
1995
影响因子：
1.5
通讯作者：
Kentaro Nakamura
中科院分区：
文献类型：
--
作者：
J. Satonobu;S. Ueha;Kentaro Nakamura
“Grigiri-Garigari”是一种科学玩具的日文名称，由一根方形杆和一个螺旋桨组成。木棒的长边沿着有几个凹口，螺旋桨用钉子松松地固定在木棒的一端。螺旋桨是通过用另一根棒摩擦棒来旋转的。玩家可以通过改变杆的抓握位置或状态以两种方式控制螺旋桨的旋转方向。本文对该玩具的机构进行了实验研究。本文的主要结果是：螺旋桨的旋转是由杆端受激的椭圆运动引起的，振动系统可用集中常数模型表示。然后，我们揭示了如何椭圆运动是由球员的操作产生的机制。
“Girigiri-Garigari” is the Japanese name of a scientific toy which consists of a square rod and a propeller. The wooden rod has several notches along its long edge, and the propeller is loosely attached to one end of the rod by a nail. The propeller is rotated by rubbing the rod with another bar. A player can control the revolution direction of the propeller in two ways, by changing the gripping position or condition of the rod. This paper presents an experimental study on the mechanism of this toy. Main results of this study are that the revolution of the propeller is caused by the elliptical motion excited at the end of the rod, and that the vibration system can be represented by a lumped-constants model. Then, we reveal the mechanism of how the elliptical motion is generated by the player's operations.