机械振动是在某一中心位置两侧的往返运动。简谐运动是机械振动的一种特例,它的运动关于其中心位置(平衡位置)具有对称性。这个对称性指做简谐运动的质点运动到关于中心位置对称的A、B两点(A、B是振子非最大位移时且关于中心位置对称的两点)时,具有以下一些特征(如图1所示): Mechanical vibrations are reciprocations on either side of a central location. Harmonic motion is a special case of mechanical vibration whose motion is symmetrical about its central position (equilibrium position). This symmetry refers to the simple harmonic motion of the particle movement to the center of the symmetric A, B two points (A, B is the non-maximum displacement of the oscillator and the center position symmetric two points), has the following characteristics (Figure 1):