Online Dynamic Balance Technology for High Speed Spindle Based on Gain Parameter Adaption and Scheduling Control

Abstract

Unbalance vibration is one of the main vibration forms of a high speed machine tool spindle. The overlarge unbalance vibration will have some adverse effects on the working life of the spindle system and the surface quality of the work-piece. In order to reduce the unbalance of a high speed spindle system, a pneumatic online dynamic balance device and its control system are presented in the paper. To improve the balance accuracy and adaptation of the balance system, the gain parameter adaption and scheduling control method are proposed first, and then the different balance effects of the influence coefficient method and the gain scheduling control method are compared through many dynamic balance experiments of the high speed spindle. The experimental results indicate that the gain parameters can be changed timely according to the transformation of the speed and kinetic parameters of the spindle system. The balance accuracy can be improved for a high speed spindle with time-varying characteristics, based on the adaptive gain scheduling control method.

Performance Analysis and Experimental Research of Electromagnetic-Ring Active Balancing Actuator for Hollow Rotors of Machine Tool Spindles

“…To eliminate the initial unbalance vector, the two counterweight discs should step rotate to their phases and the phase values are given by Therefore, when the initial vibration of the detected rotor is achieved by the data collection unit, the new positions of the two counterweight discs can be solved by Equations (8)- (12).…”

“…Therefore, it is necessary to frequently do dynamic balancing of spindles in workshops. In general, the dynamic balancing of spindles is a manual and iterative process, requiring experienced technicians and a lot of time [12][13][14]. For intelligent spindles, the balancing process must be automatic, without human intervention, so the requirement of engineering promotes the development of active balancing actuators.…”

Novel Liquid Transfer Active Balancing System for Hollow Rotors of High-Speed Rotating Machinery

“…In general, there are two categories of research on dynamic balance technology: offline balance technology and online automatic balance technology. Owing to the difference in balancing principles, offline balance research can take several directions, such as the influence coefficient method [1][2][3], modal analysis method [4], field balancing [5,6], and the virtual dynamic balance method [7,8]. These methods can reduce the unbalance vibration of the machinery in the field; however, using this procedure, the rotating machinery needs to stop working and even stop several times, which results in time and economic losses.…”