A Novel Low‐Torque Ball Re‐Positioning Scheme Based on a Sliding‐Mode Ball Observer for an Automatic Balancer System

Chao, Paul C.-P.; Chiu, Chian‐Song; Shih, Kai Teng

doi:10.1155/2008/196350

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…The imbalance is canceled, and the radial vibration is significantly reduced. This kind of dynamic balancing actuator has been well applied in hard disk and optical disc drives, and can usually be divided into single ball type [107] and double ball type [108]. A double-ball automatic balancing actuator is shown in Figure 28.…”

Section: Ball Actuatormentioning

confidence: 99%

A Review on Self-Recovery Regulation (SR) Technique for Unbalance Vibration of High-End Equipment

Pan

Huo

et al. 2020

Chin. J. Mech. Eng.

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The high-end equipment represented by high-end machine tools and aero-engines is the core component of the national intelligent manufacturing plan, and the mass unbalance is the main reason for its excessive vibration, that seriously impacts the operation efficiency and running life of the equipment. In order to change the traditional way that the fault of equipment can only be repaired by human, the self-recovery mechanism of human and animal are given to the equipment in this paper, which forms the self-recovery regulation (SR) system for unbalance vibration of high-end equipment. The system can online generate the self-recovery force to restrain the unbalance vibration of the equipment in operation, which is an important direction for the development of the equipment to the advanced intelligent stage. Based on the basic principles of SR technique, the typical engineering application cases of this technique in the field of aeroengine and high-end machine tools are introduced, and four related studies promoting the development of this technique are summarized and analyzed in turn. It includes feature extraction, imbalance location, regulation method and balancing actuator. Self-recovery Regulation (SR) Technique is an important way to realize intelligent manufacturing and intelligent maintenance. Relevant research can lay a technical foundation for the development of high-end equipment with self-health function.

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Section: Ball Actuatormentioning

confidence: 99%

A Review on Self-Recovery Regulation (SR) Technique for Unbalance Vibration of High-End Equipment

Pan

Huo

et al. 2020

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

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“…But there was no suggestion for reducing the residual balancing error. Chao et al (5) have estimated the position of balancing balls for an auto-balancer mounted on an optical disc drive by using a sliding mode observer. They repositioned the balls in order to reduce the residual balancing error.…”

Section: Journal Of System Design and Dynamicsmentioning

confidence: 99%

Motion Analysis of Balancing Balls of Auto-Balancer for Reducing Error in Passing Critical Speed

Yoshida

Naka

2013

JSDD

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Motion analysis of balancing balls of an auto-balancer is performed in order to reduce the residual positioning error when the device passes the critical speed. The rotation speed profile control method improves the performance of an auto-balancer by providing a variable-speed period in the middle of motor acceleration at a rotation speed that passes through the critical speed. In order to confirm its effect, equations of motion of the auto-balancer mechanism including balancing balls are modeled based on a non-stationary vibration model. Time-variant dynamics of an auto-balancer in accelerating the motor are simulated by using MATLAB and the balls are confirmed to move toward the balancing position. Optimal conditions of the variable-speed period of the rotation speed profile are explored and comprehensively simulated as a parameter of start time, transit time and profile shape. It is shown that residual balancing is eliminated by the driving force of the balls. Furthermore, an experimental study is performed on an optical disc drive with an auto-balancer and vibration amplitude caused by an unbalanced disc is measured to be suppressed by the method.

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“…The use of multiple raceway tracks or balancing masses is a viable solution [20] as the addition of multiple down-scaled ball balancers have more freedom to relocate. Considering the one-ball ABB, a shock technique was presented in [21] whereby a sudden torque shock swirls the balancing mass to a different place.…”

Section: Introductionmentioning

confidence: 99%

Let’s Make Ball Balancing Great Again: Why You Should Use Temporary Speed Reduction

et al. 2020

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Automatic ball balancing is a technique adopted in rotordynamics to reduce unknown rotor unbalance automatically. This technique sounds appealing as it can ease a panoply of balancing issues considerably. The presence of stiction, however, scatters consistent qualitative balancing and led to a limited implementation in the industry. Temporary speed reduction, a recent technique, could be used as a countermeasure for the stiction-induced scattering. Presented in this paper is an in-depth study detailing how the technique should be implemented to guarantee effective balancing. By analysing a rotordynamic model of the Jeffcott kind, the influence of a multitude of parameters is studied such as the initial mass positions, the initial unbalance, the adopted speed profile, shaft damping, stiction and the speed reduction plateau of the adopted speed reduction strategy. The main findings of the study are that the adverse effects of stiction can be contained considerably using the speed reduction technique, especially in the under-excited range where a ball balancer behaves poorly when adopting a standard run-up profile. Finally, the speed plateau of the speed reduction technique should be selected carefully, preferably accounting for stiction, shaft damping and even more so the initial unbalance.

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A Novel Low‐Torque Ball Re‐Positioning Scheme Based on a Sliding‐Mode Ball Observer for an Automatic Balancer System

Cited by 9 publications

References 15 publications

A Review on Self-Recovery Regulation (SR) Technique for Unbalance Vibration of High-End Equipment

A Review on Self-Recovery Regulation (SR) Technique for Unbalance Vibration of High-End Equipment

Motion Analysis of Balancing Balls of Auto-Balancer for Reducing Error in Passing Critical Speed

Let’s Make Ball Balancing Great Again: Why You Should Use Temporary Speed Reduction

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