An improved holospectrum-based balancing method for rotor systems with anisotropic stiffness
- 17 May 2012
- journal article
- research article
- Published by SAGE Publications in Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
- Vol. 227 (2), 246-260
- https://doi.org/10.1177/0954406212447521
Abstract
As a ubiquitous phenomenon in rotor systems, anisotropic stiffness generally causes the response of an unbalanced rotor to vary across radial directions. The standard holospectrum-based balancing method, which adopts the initial phase vector as a balancing object, cannot be used in rotor systems with anisotropic stiffness. To tackle the limitations of the standard holospectrum-based balancing method, an improved holospectrum-based balancing method with increased accuracy and a greater scope of application is presented in this article. First, a dynamic model of an unbalanced rotor system with anisotropic stiffness is developed, the theoretical expression of the deviation between the initial phase vector and the unbalance is examined, and the effects of anisotropic stiffness on the initial phase vector are analysed. Second, based on the analysis of the precession characteristics of the rotor, a modified initial phase vector that compensates for the negative influence of anisotropic stiffness is presented as the new balancing object. An improved holospectrum-based balancing method is proposed based on this modified initial phase vector, and the balancing procedures are summarised in detail. Finally, the initial phase vector induced error in the identification of the unbalance is simulated for different initial conditions, and the feasibility of the modified initial phase vector is verified on a rotor test rig. Both the numerical analysis and the empirical test validate the effectiveness and accuracy of this new method.Keywords
This publication has 19 references indexed in Scilit:
- Imbalance Estimation Without Test Masses for Wind TurbinesJournal of Solar Energy Engineering, 2009
- Review: Rotor BalancingShock and Vibration, 1998
- Balancing of High-Speed MachineryPublished by Springer Science and Business Media LLC ,1989
- Modal Balancing of Flexible Shafts without Trial WeightsProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 1985
- Response Analysis of a General Asymmetric Rotor-Bearing SystemJournal of Mechanical Design, 1980
- Balancing Method of Multi-span, Multi-bearing Rotor System : 1st Report, Multiplane, Multispeed BalancingBulletin of JSME, 1979
- On the Use of Balancing Machines for Flexible RotorsJournal of Engineering for Industry, 1972
- Should a Flexible Rotor Be Balanced in N or (N + 2) Planes?Journal of Engineering for Industry, 1972
- Flexible Rotor Balancing by the Exact Point-Speed Influence Coefficient MethodJournal of Engineering for Industry, 1972
- A Least-Squares Method for Computing Balance CorrectionsJournal of Engineering for Industry, 1964