Vibration Suppression of Full Automatic Washing Machine

对一台全自动洗衣机的振动抑制进行了研究。与其他旋转机械不同的是，洗衣机的不平衡是非常大的，它的方向和大小在每次操作中都会发生变化。为了抑制振动，我们尝试应用被动振动控制理论，得到了以下结果：首先，我们得到了一个合适的洗衣机理论模型。改变参数值，进行数值模拟，研究振动控制效果。我们确定共振峰从1/2减小到1/3左右。其次，通过实验对其效果进行了研究。在洗衣机笼下安装了减振器。由于无法得到刚度与数值模拟已知的最优参数值吻合的弹簧，因此无法得到与数值结果相同的结果。然而，我们可以大大抑制振动。同时阐明了摩擦对振动抑制有相当大的作用。第三，研究了振动主动控制的效果。这种控制的思想是，当转子通过谐振时，磁体突然改变弹簧的刚度。并进行了数值模拟。但这项研究目前正在调查中。

Vibration suppression of a full automatic washing machine was investigated. Different from the other rotating machinery, the unbalance of a washing machine is extremely large and its direction and magnitude change at every operation. In order to suppress vibration, we tried to apply passive vibration control theory and obtained the following results.First, we obtained a proper theoretical model of a washing machine. Changing parameter values, we executed numerical simulation and investigated the effects of vibration control. We ascertained that the peak of resonances decreased to about from 1/2 to 1/3.Secondly, we investigatd the effects by experiments. A vibration damper was mounted below the cage of washing mashine. Because springs whose stiffness coincides with the most optimal parameter values known by numerical simulation could not obtained, we could not get the same result as the numerical result. However, we could suppress the vibration considerably. It was also clarified that friction has considerable effect to the vibration suppression.Thirdly, we investigated the effect of active vibration control. The idea of this control is that the stiffness of spring is changed by magnet abruptly when the rotor passed the resonance. Numerical simulation was executed. But this research is under investigation now.