不管构件如何精心设计、制造和安装,有些设备运转总是不平稳的。一些粗糙机械的振动通常是由不平衡旋转构件造成的。不平衡构件有一个与旋转轴线不重合的重心。运转时,回转机构上偏心距的作用可通过几何模型估算出来,即设想每一构件用重量等效地集中在各自重心上。插图说明一个典型的有三个不平衡部件回转机构的轴承简支梁例子 No matter how well the components are designed, manufactured and installed, some equipment is not always stable. Some rough mechanical vibrations are usually caused by unbalanced rotating components. Unbalanced components have a center of gravity that does not coincide with the axis of rotation. During operation, the effect of the eccentricity on the slewing mechanism can be estimated by means of a geometric model, which means that each component is assumed to be equally weighted in its own center of gravity. Illustration shows a typical example of a bearing simply supported beam with three unbalanced component slewing mechanisms