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(4)倍频振动(图14d,见第四期) 我们将弦的一头B点装牢在一个膜片的中心,并使弦作横振动,这时可以看到一个奇妙的现象:A点不动,B点则是在动的。当弦的中点M运动到m_1时,膜的中点从B移到C;当弦中点从m_1回到M时,C回到B。在横振动周期的后半周中,M向m_2运动,B又回到C,从m_2回来时,C也往B回来。简言之,弦振动一个完全的周期,膜将振动两
(4) Multiplicative vibration (Figure 14d, see fourth period) We will be a string B point B fixed in the center of a diaphragm, and the horizontal vibration of the string, then you can see a wonderful phenomenon: A point Not moving, point B is moving. When the mid-point M of the string moves to m_1, the mid-point of the film moves from B to C; when the mid-point of the string returns from m_1 to M, C returns to B. In the second half of the horizontal oscillation period, M moves toward m_2, B returns to C, and when m returns, C returns to B again. In short, the string vibrates a full cycle and the film will vibrate two