本文介绍的振动螺旋桨是一个简单、有趣地演示x方向的谐振动和 y 方向的谐振动迭加的好方法。振动螺旋桨的构造如图1所示,由一个截面为正方形的木捧 A 和一个很薄很轻的叶片 B 组成。木捧长约30～40厘米,宽约2厘米,在捧的一个棱上等间隔地(如1厘米)开20余个槽口,深度约3毫米,叶片 B 用小钉作轴装在捧的一端,叶片可在轴 C 上自由转动,捧的另一端是把手。叶片的大小约为2×8厘米,厚度1毫米。木捧的木料以轻而弹性好的松木、 The vibrating propeller described in this article is a good, easy way to demonstrate the harmonic vibrations in the x-direction and the harmonic vibrations in the y-direction. The structure of the vibrating propeller is shown in Fig. 1, consisting of a wooden panel A with a square cross section and a thin, light blade B. The wood is about 30 to 40 cm long and about 2 cm wide. More than 20 notches are made at equally spaced intervals (for example, 1 cm) at a ridge of about 3 mm in depth. The blade B is mounted on the shaft with small spikes At one end, the blade can rotate freely on the axis C, holding the handle at the other end. The size of the leaves is about 2 × 8 cm, the thickness of 1 mm. Wood with wood to light and good elasticity of the pine,