A New Field Unbalance Estimation Method for Flexible Rotors

Abstract

Current field unbalance estimation methods regards “flexible rotors with lumped mass” as the main research object, and most of them need a stop running to take trial weights. Due to its test speed closing to the critical speed, the process of balance is really complicated and dangerous. This paper concerns rotors which unbalance state shows a continuous spatial distribution. Firstly, a dynamic finite element (FE) model of the rotor system is built, the inherent relations and differences between the dynamics transfer matrix and influence coefficient (IC) matrix are analyzed, and then, an extended dynamics matrix with arbitrary dimension is obtained based on the principle of IC balancing method. Secondly, the continuous distribution mass eccentricity curve is represented as mass eccentricity point on each FE model node, and the unbalance forces imposing on each FE model node are identified by the extended dynamics matrix. Finally, the theoretic analysis and experiment is presented to verify this method, and the result shows that unbalance forces on all FE model nodes can be identified accurately with less measuring points, and higher order modal components of the distributed unbalance are balanced effectively.

Research on dynamic balance optimization method of flexible rotor based on GWO

“…Deepthikumar et al [30] have replaced the transfer matrix with the influence coefficient matrix to achieve the dynamic balance of the flexible rotor. Zhang et al [31,32] have found and proved that the two are equivalent by studying the relationship between the rotor dynamics transfer function and the influence coefficient and completing the dynamic balance of the flexible rotor through the transfer function.…”

Application of Mathematical Morphology Filter in Non-Stationary Signal of the Spindle Dynamic Balance Regulator Online Adjustment Process

“…Nowadays, the most of the spindle dynamic balance regulator using trial weights method [3], however, the mistake trial weights will due to the violent vibration. The situation of amplitude change of spindle vibration signal is able to warn the mistake trial weights, and avoid the fault of the running spindle [4,5]. The signal of the spindle dynamic balance regulator online adjustment process has strong nonstationarity, which could not process with traditional signal processing methods.…”