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据了解,用普通木制弦轴的民族乐器,在定好弦后,常常会发生跑弦现象。跑弦会给演奏带来很大的麻烦,从而降低了乐器的使用价值。下面以二胡轴为例,分析跑弦的原因,并提出进行改革的意见。图一中,半径为 R 的园表示弦轴端面的外形,T 表示弦的张力。弦的张力对轴中心的力矩:M_1=T·R。设轴孔对轴的最大摩擦力矩为 m_1。那末,当 M_1=m_1时,将发生跑弦现象。
It is understood that with ordinary wooden string axis of national musical instruments, set a good string, the stringing phenomenon often occurs. Pants will bring a lot of trouble to the performance, thus reducing the value of the instrument. Take the Erhu shaft as an example to analyze the reason of running string and put forward the opinion of carrying on the reform. In Fig. 1, the circle with radius R represents the outline of the end surface of the chord, and T represents the tension of the chord. Tension of the string to the center of the shaft: M_1 = T · R. Set the shaft hole on the axis of the maximum friction torque m_1. Then, when M_1 = m_1, the stringing phenomenon will occur.