Method and machine for rotor imbalance determination
First Claim
1. An unbalance determining apparatus for a rotor, the apparatus comprising two spaced apart bearings to support a rotor and rotation means to rotate the rotor in use, the apparatus characterised in that there is a dynamic bearing associated with the rotor and whereby the dynamic bearing provides synchronous deflection force components upon the rotor when rotating which are in phase with local rotor deflection and/or velocity force components upon the rotor when rotating which are in phase with local rotor velocity in order that differing boundary conditions are provided for determining unbalance of the rotor by appropriate analysis.
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Accused Products
Abstract
Correcting unbalance with regard to rotors (11, 101) and shafts is important in order to improve performance of those rotors (11, 101) or shafts within a practical machine or engine. Previously, result orientated iterative balancing of the rotor or shaft has been achieved in which mass has been added or possibly intrusive and distorted adjustments in drag and stiffness presented through bearings or alteration of the rotor (11, 101) itself have been utilised to improve rotor balance performance. In the present invention, a dynamic bearing 13 is utilised in order to provide force components with some components in phase with rotor deflection in order to simulate negative stiffness and/or some force components in phase with rotor velocity in order to simulate negative drag upon the rotor (11, 101). In such circumstances, a more accurate determination of rotor unbalance is achieved to enable known techniques of perturbed boundary condition analysis for balance correction to be implemented more accurately.
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Citations
13 Claims
- 1. An unbalance determining apparatus for a rotor, the apparatus comprising two spaced apart bearings to support a rotor and rotation means to rotate the rotor in use, the apparatus characterised in that there is a dynamic bearing associated with the rotor and whereby the dynamic bearing provides synchronous deflection force components upon the rotor when rotating which are in phase with local rotor deflection and/or velocity force components upon the rotor when rotating which are in phase with local rotor velocity in order that differing boundary conditions are provided for determining unbalance of the rotor by appropriate analysis.
Specification