四线摆

        谐振具有周期性,画笔记录的是平台谐振衰减的轨迹,由于平台摆动初始相位的不同,其谐振衰减周期也不相同,画出的每一次衰减轨迹也不相同。

        操作方法：
        1、放好专用纸扭动平台
        2、放下画笔
        3、观察平台谐振衰减周期的轨迹。
    

        Resonance has periodicity. The painting brush records the locus of terrace resonance attenuation. As the initial phase of the terrace swing is different, its resonance attenuation cycle is also different and the attenuation locus drawn every time is different.
       Method of Operation:
       1.Put a special -purpose paper and twist the terrace.
       2.Put down the painting push.
       3.observe the locus of terrace resonance attenuation cycle.