Vibration suppression of rotating machinery is an important engineering problem. In this paper, a review of the research work performed in real-time active balanc- ing and active vibration control for rotating machinery, as well as the research work on dynamic modeling and analy- sis techniques of rotor systems, is presented. The basic methodology and a brief assessment of major difficulties and future research needs are also provided.

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Active Balancing and Vibration Control of Rotating Machinery: A Survey

Primary and parametric resonances of asymmetrical rotating shafts with stretching nonlinearity

Suppression of imbalance vibration for AMBs controlled driveline system using double-loop structure

This study proposes design procedures for the permanent-magnet-biased magnetic bearings (PEMBs) in rotor systems. Many aspects of designing magnetic bearings are discussed, e.g. the selection of a permanent magnet material, dimensions of electromagnets and permanent magnets, gap length, load capacity and maximum Ampere-turns. Linearization and DC current driver are the two constraints for determining feasible designs. According to an analytical model with a rigid body assumption for the rotor-bearing system, a decentralized output feedback control algorithm is employed to control this inherently unstable magnetic suspension rotor system. Experimental results indicate that the controlled rotor performs well at rotor speeds up to 12,000 rpm.

/pdf/design-of-a-permanent-electromagnetic-magnetic-bearing-41byfvlf9w.pdf

Design of a Permanent~Electromagnetic Magnetic Bearing-controlled Rotor System

Optimal placement of actuators on intelligent structures is an important part of intelligent structure designs. The optimal collocation of actuators includes placement collocation and number collocation. It decides stability, controllability and control efficiency of structural control systems. With the development of control technology, the optimal collocation of actuators in structures is more and more important. Although optimal collocation of actuators can be determined by experience in some cases, experience is useless for complicated structures. So optimal collocation of actuators must be realized by optimal theory. Based on modal control theory, the Maximal Modal Force Rule is put forward for intelligent flexible plates bonded point piezoelectric actuators on their surface in this paper. The rule points out that point piezoelectric actuators should be bonded on the places of maximal modal strains of every order mode to produce maximal modal control forces. The formulae for independent modal space c...

Maximal Modal Force Rule for Optimal Placement of Point Piezoelectric Actuators for Plates

Vibration control of a horizontal rotor with an asymmetrical moment of inertia is investigated. A linear optimal control system is developed to stabilize and control the rotor system by using the mathematical model of a rotor system expressed in the rotating coordinates. An approximated dynamical equation of a long rotor system is derived and used to obtain the compensator in analytical form (which saves much computational effort in control design), and is particularly useful in hardware implementation. Simulation results show the efficiency of the proposed strategy. The influences of weighting matrices and the effects of the asymmetrical moment of inertia on system performance for different controllers are also assessed.

/pdf/active-control-of-an-asymmetrical-rigid-rotor-supported-by-mew5i2hk3f.pdf

Active control of an asymmetrical rigid rotor supported by magnetic bearings

The controller design for a permanent/electromagnetic magnetic bearing system that suspends a high-speed rigid horizontal rotor is investigated. The key points to ensure the stability of a rotor using this type of magnetic bearing are discussed. To facilitate implementation, a decentralized state feedback algorithm is proposed to stabilize the inherently unstable magnetic suspension system. Experimental results for the controlled system show that the system operates well at rotor speeds of up to 10,000 rpm.

https://ir.nctu.edu.tw:443/bitstream/11536/2017/1/A1995PV65600006.pdf

Decentralized control of a rotor system supported by magnetic bearings

Analysis of mixing effect and power consumption of cone-bottom dual Rushton turbines stirred tank

In this paper we present a new controller design method that effectively suppresses vibration in flexible systems. The method allows integrated determination of sensor/actuator locations and feedback gain via minimization of an energy criterion which represents the integrated total energy stored in the system. This energy criterion is characterized by an effective representation of vibration, determined via an efficient solution of the Lyapunov equation and minimized with a quasi-Newton or recursive quadratic programming algorithm. The application of this method to a simple flexible structure confirms the direct relationship between our optimization criterion and effectiveness of vibration suppression.

Yi Hua Fan

Papers

Design of a Permanent~Electromagnetic Magnetic Bearing-controlled Rotor System

Active control of an asymmetrical rigid rotor supported by magnetic bearings

Decentralized control of a rotor system supported by magnetic bearings

Analysis of mixing effect and power consumption of cone-bottom dual Rushton turbines stirred tank

Effective Active Damping Design for Suppression of Vibration in Flexible Systems via Dislocated Sensor/Actuator Positioning