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Difference between revisions of "Balancing single/dual plane"
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==Introduction== | ==Introduction== | ||
A rotor is a body rotating | A rotor is a body rotating around its axis during service. In general such a rotor consists of an axle with one or more discs fitted to the axle. Such discs can be fly wheels, grinding wheels, or turbine wheels etc. The axle running in bearings allows thus the rotation of the body. | ||
Depending on their rotational speed, rotors can be grouped in two basic categories: <u>rotors with rigid shaft</u>, and <u>rotors with flexible shaft</u>. If the operating speed remains below half of the first critical bending speed, the body does not deflect. At such operation speeds and non circular cross section of the shaft and / or rotor, the axis of rotation and the inertial axis do not coincide. This results in a tumbling movement of the structure, the size of which depends on the bearing clearance and stiffness. In any case the bearings are subjected to unnecessary or even non allowed loads. At higher speeds the shaft will deflect, due to the non symmetric circular cross section. Depending on the position of the discs on the shaft they can even be inclined and thus increase the whirl. | Depending on their rotational speed, rotors can be grouped in two basic categories: <u>rotors with rigid shaft</u>, and <u>rotors with flexible shaft</u>. If the operating speed remains below half of the first critical bending speed, the body does not deflect. At such operation speeds and non circular cross section of the shaft and / or rotor, the axis of rotation and the inertial axis do not coincide. This results in a tumbling movement of the structure, the size of which depends on the bearing clearance and stiffness. In any case the bearings are subjected to unnecessary or even non allowed loads. At higher speeds the shaft will deflect, due to the non symmetric circular cross section. Depending on the position of the discs on the shaft they can even be inclined and thus increase the whirl. | ||