多功能机械振动图象演示仪肖毅（广西柳铁二中５４５００７）现行高中课本中，是利用“沙摆”装置来描绘振动图象的。这种图象本应属阻尼减幅振动的图象，但因沙摆在振动中所受空气阻力小，能量损耗得慢，振幅减小得慢，在只观其振动中相邻几个周期的图象时，则可视之为自... Multi-functional mechanical vibration image demonstrator Xiao Yi (Guangxi Liu Tie Erzhong 545007) In the current high school textbooks, the “sand pendulum” device is used to depict the vibration image. This kind of image should be a damped amplitude-reduced vibration image, but due to the small air resistance of the sand pendulum in the vibration, the energy loss is slow, the amplitude is reduced slowly, and only a few cycles are observed in the vibration. When you look at the image, you can see it as...