Semiactive sliding-mode control of the unbalance response in a rotor-bearing system supported on MR dampers

2009 6th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)

2009

This work describes the problem of the unbalance response compensation in a rotor-bearing system using two control techniques based on measurements of the radial displacements or accelerations directly in a Magnetorheological (MR) bearing suspension. The rotor-bearing system is modeled using Finite Element Methods (FEM) for a Jeffcott-like rotor with one planar disk, two nonorthotropic supports, one traditional journal bearing and other similar but supported on an arrangement with two MR dampers. The mathematical model consists of two finite elements, with a total of 6 degrees of freedom for each horizontal and vertical direction. For the rotating speed regulation a PID control, is applied in order to track a proper speed profile to pass over the first critical speeds (runup or coast down). Control schemes to compensate the unbalance in the rotor are: a Positive Position Feedback (PPF) control, which requires only the measurement of one radial displacement in the MR suspension, and another scheme based on the measurement of the radial acceleration, known as Positive Acceleration Feedback (PAF). Both control schemes require only one sensor (proximitor or accelerometer) for each control input and they demand small control efforts. For the control design and physical implementations, we use the socalled Choi-Lee-Park polynomial model for both MR dampers, which can adequately describe the highly nonlinear and hysteresis behaviors for this type of actuators. Finally, by means of some numerical simulations are illustrated the dynamic and robust performance of the overall control system.

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Section: A Closed Loop Simulation Resultsmentioning

confidence: 98%

“…We used two identical MR dampers RD-1097-01 in a previous work, both manufactured by Lord Corporation R (Silva and Cabrera [10]), whose damping forces are…”

Section: B Mr Damper Modelmentioning

confidence: 99%

Positive position and acceleration feedback control for the unbalance response in a rotor-bearing system

2009 6th International Conference on Electrical Engineering, Computing Science and Automatic Control (CCE)

2009

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“…In this work we employ the Choi-Lee-Park polynomial model for the MR dampers [2]. In a previous work we have used the polynomial model for a MR damper RD-1097-01, manufactured by Lord Corporation ® , whose damping force is characterized by [13] …”

Section: Polynomial Model Of the Mr Dampermentioning

confidence: 99%

“…The polynomials with best fitting to the experimental results are of order n D 2, whose coefficients are given in Table 48.2 [13]. This MR damper can provide forces up to 100 N using current inputs up to 1 A, with a response time about 25 ms, and, therefore, we can apply semiactive damping forces to control harmonic vibrations up to 40 Hz, employing a small total power of 2.5 W. However, to avoid possible damage the maximum current input is physically limited to 0.5 A.…”

Section: Polynomial Model Of the Mr Dampermentioning

confidence: 99%

See 1 more Smart Citation

Semiactive Vibration Control in a Three-Story Building-Like Structure Using a Magnetorheological Damper

Enríquez-Zárate

Conference Proceedings of the Society for Experimental Mechanics Series

2015

This article considers the dynamic analysis and semiactive vibration control on a building-like structure, excited on its base through an external force generated by an electromechanical shaker providing harmonic and seismic motion at the base of the overall structure. The mathematical model of the overall system is obtained using Euler-Lagrange methods, which is validated by means of experimental modal analysis techniques. In fact, the external force excites the first three (lateral) vibration modes of the building-like structure. Therefore, to suppress and/or attenuate the undesirable vibrations on the structure, it is proposed a semiactive vibration control scheme considering a Magneto-Rheological damper directly coupled between the base and the first floor. The hysteretic behavior of the Magneto-Rheological damper is modeled by means of the polynomial approach proposed by Choi-Lee-Park. Finally, a Multi Positive Position Feedback controller combined with Sliding-Mode Control techniques is synthesized, using as output the position provided by an accelerometer collocated on the first floor. Some experimental results are presented to show the dynamic performance of the overall building-like structure.

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A semiactive control scheme for a 6-DOF model of a rotor-bearing system with a MR suspension

2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control

2008