论文部分内容阅读
高中物理课本上册 P269上,说:“许多弦乐器都装有共鸣箱(胡琴的琴筒、提琴的琴体等都是共鸣箱),利用共鸣箱中的空气柱跟琴弦共振,来增强乐器发出的声音。”其实,这是错误的说法。弦乐器上的“共鸣箱”,只是利用受迫振动,而避免产生共振现象。大家知道,胡琴的琴筒、提琴的琴体里的空气柱只是受弦振动周期力的作用,发生强迫振动。一定形状、体积和密度的空气柱的固有频
High school physics textbook on the P269, said: “Many stringed instruments are equipped with resonance box (violin harp, violin body is the resonance box), the use of resonance box in the air column with the strings resonance, to enhance the instrument issued The voice. ”In fact, this is the wrong argument. The “resonance box” on a stringed instrument uses only forced vibrations to avoid resonance. We all know that the violin piano, violin body of the air column is only subject to the role of periodic vibration of the string vibration occurs forced vibration. The natural frequency of a column of air of a certain shape, volume and density