The coupling variable can be displacement , velocity or acceleration.
耦合的变量既可以是位移，也可以是速度、加速度。
2
The optimum ma-chine index (ration of screen acceleration to acceleration due to gravity) can be adjusted to each particular application by means of the variable out-of-balance force.
对于每一个具体的应用案例。可以通过调节偏心力获得最优的设备运行参数{筛分加速度和重力加速度的比值！
3
So, variable structure control theory is used in Angle stabilization of roll, and model - following variable structure control theory is used in acceleration stabilization of pitch and yaw.