A modal-based balancing method for a high-speed rotor without trial weights

Abstract

Abstract. The unbalance-induced vibration of a high-speed rotor directly affects the manufacturing accuracy. To effectively suppress this undesired vibration and avoid the complicated process of using trial weights during the balancing adjustment, a modal-based balancing method for a high-speed rotor without trial weights is proposed. First, the matrix sweep operation is employed to acquire the unbalance equivalent plane (EP). Next, the equivalent concentration methods, using the vector feedback principle (VFP) and modal equivalent principle (MEP), respectively, are studied and compared, while the equivalent transfer of the continuous unbalance vector to the EP is realized. Then, through modal analysis and the MEP, a balancing method, without trial weights required, is proposed for the high-speed rotor, which only needs to collect vibration data below critical speed. Finally, the rotor model and the presented method are validated on a rotor test platform, where the simulation and experiment results show that the unbalance-induced vibration has been effectively suppressed, ensuring smooth and safe operation of the rotor at high speed.

A Review of Key Technologies for High-Speed Motorized Spindles of CNC Machine Tools

“…The reliability of neural network algorithms for online prediction of rotor's unevenness is proposed Zhang et al [57] the dynamic balancing method without trial for modalities Suppression of vibration caused by rotor unbalance…”

“…The cost of on-site balancing is reduced and the balancing efficiency is improved. To suppress the vibration caused by the unbalance of the rotor, the authors of [57] based their study on the modal trial-weightless dynamic balancing method. By collecting the vibration data below the critical speed, simulation analysis and experiments show that the vibration caused by unbalancing is suppressed.…”

Flexible rotor unbalance fault location method based on transfer learning from simulation to experiment data

“…Yao et al [23] integrated with the dual-objective optimization method, optimized the rotor multi-speed balance strategy, and the multi-speed flexible rotor dynamic balance is realized. Zhang et al [24], Li et al [25], and Ye et al [26] investigated a dynamic balance method with no trial weights and combined the modal and similarity theories to propose a dynamic balance method without trial weights, which improved balance efficiency and achieved a better balance effect. Several other scholars have developed intelligent condition monitoring and controlling equipment for rotor systems [27,28].…”

Continuous Rotor Dynamics of Multi-Disc and Multi-Span Rotors: A Theoretical and Numerical Investigation of the Identification of Rotor Unbalance from Unbalance Responses

“…Sanches [33] proposed an identification method of unbalance for a rotor with residual shaft bent based on the finite element method and correlation analysis. Zhang [34] proposed an unbalance identification method for a high-speed rotor without trial weights based on modal analysis and the modal equivalent principle. The shortcomings of the above-mentioned methods are that they cannot incorporate any number of bearings and discs.…”