进行机械振动的教学一般都是从讨论弹簧振子入手,引出振中最简单的特例——简谐运动.实际上,振子除了受到振动系统本身的弹力之外,还会同时受到摩擦和空气阻力的影响,这样,振子在振动开始所获得的机械能在振动过程中不断地减少,因为振动系统的能量与振幅的平方成正比,所以在能量随时间减少的同时,振幅也随时间而减小,物理学里把振幅逐渐减小的振动叫做阻尼振动. The teaching of mechanical vibration is generally started from the discussion of the spring oscillator, and the simplest special case of the vibration is the simple harmonic motion. In fact, in addition to the elastic force of the vibration system itself, the vibrator also receives friction and air resistance. Influencing, in this way, the mechanical energy obtained by the vibrator at the beginning of the vibration is continuously reduced during the vibration process, because the energy of the vibration system is proportional to the square of the amplitude, so the energy decreases with time and the amplitude also decreases with time. The vibration that gradually reduces the amplitude in the school is called damping vibration.