若旋转系统振动极大,并不一定是由轴本身所引起。无论什么零件,如果降低其刚度或增大其质量,就可能使临界转速降低到工作转速范围内。因此,应围绕整个旋转系统来解决振动问题。旋转机械中的各种转动轴在某一“临界”转速下旋转时,都可能出现破坏性的横向振动。这些临界转速是由与轴系的一个或几个自然频率相同的旋转频率来确定的。即使是经过精确平衡的系统,如在临界转速下运转时,轴也会发生振动。平衡只能缩小产生峰值振动的速度范围,但不能将其消除。因此,一个经过精确平衡的系 If the rotating system vibrates very much, it does not have to be caused by the shaft itself. No matter what parts, if you reduce its stiffness or increase its quality, it may reduce the critical speed to the operating speed range. Therefore, vibration problems should be solved around the entire rotating system. Destructive lateral vibrations may occur when the various rotating shafts in rotating machinery are rotated at a certain “critical” speed. These critical speeds are determined by the same rotation frequency as one or several natural frequencies of the shaft system. Even well-balanced systems, such as those at critical speeds, vibrate the shaft. Balancing only narrows the speed range at which peak vibration occurs, but it can not be eliminated. Therefore, a precisely balanced system