Hybrid Active Vibration Control of Rotorbearing Systems Using Piezoelectric Actuators

Palazzolo, Alan; Jagannathan, Shankar; Kascak, Albert F.; Montague, Gerald T.; Kiraly, L. J.

doi:10.1115/detc1991-0389

13th Biennial Conference on Mechanical Vibration and Noise: Modal Analysis, Modeling, Diagnostics, and Control — Analytical And 1991

DOI: 10.1115/detc1991-0389

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Hybrid Active Vibration Control of Rotorbearing Systems Using Piezoelectric Actuators

Alan Palazzolo

Shankar Jagannathan

Albert F. Kascak

et al.

Abstract: The vibrations of a flexible rotor are controlled using piezoelectric actuators. The controller includes active analog components and a hybrid interface with a digital computer. The computer utilizes a grid search algorithm to select feedback gains that minimize a vibration norm at a specific operating speed. These gains are then downloaded as active stiffnesses and dampings with a linear fit throughout the operating speed range to obtain a very effective vibration control.

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Adaptive Influence Coefficient Control of Single-Plane Active Balancing Systems for Rotating Machinery

Dyer¹,

2000

Journal of Manufacturing Science and Engineering

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Rotating unbalance is a costly source of harmful vibration affecting a wide variety of applications such as high-speed machine tools and turbomachinery. Active balancing technology allows adjustment of a machine’s balance state while conditions change as the machine continues to operate. An adaptive control law for single-plane active balancing is presented here for control of steady-state rotation-synchronous vibration. The adaptive control method, based on the well known “influence coefficient” approach, requires no a priori modeling or estimation of plant dynamics. A control “gain” parameter is introduced and shown to enhance stability robustness of the nonadaptive portion of the control law. A recursive on-line system identification method is presented that uses exponential weighted averaging to mitigate the effects of measurement noise and system nonlinearities. Experimental results establish the efficacy of the adaptive control system even in the face of certain nonlinear and time-varying rotordynamic systems.

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Adaptive Influence Coefficient Control of Single-Plane Active Balancing Systems for Rotating Machinery

Dyer¹,

2000

Journal of Manufacturing Science and Engineering

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Electromechanical Modeling of Hybrid Piezohydraulic Actuator System for Active Vibration Control

Tang

Palazzolo

Kascak

et al. 1997

Journal of Dynamic Systems, Measurement, and Control

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Electromechanical modeling of a hybrid piezohydraulic actuator system for active vibration control was developed. The transfer function of piezoelectric actuator was derived from the electromechanical potential energy law. This transfer function represents the dynamic relationship between input electric voltage and piezoelectric actuator displacement. The hydraulic actuator was characterized by impedance matching in which its transfer functions were experimentally determined. The transfer functions were transformed into a state-space representation, which is easily assembled into an active vibration control (AVC) closed-loop simulation. Good correlation of simulation and test was achieved for the hybrid system. A closed-loop dynamic simulation for imbalance response with/without AVC of a spinning rotor test rig at NASA Lewis was performed and showed excellent agreement with test results. The simulation couples the piezoelectric, hydraulic, and structural (rotor) components.

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PI Control of HSFDs for Active Control of Rotor-Bearing Systems

Hathout

El-Shafei

1997

Journal of Engineering for Gas Turbines and Power

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This paper describes the proportional integral (PI) control of hybrid squeeze film dampers (HSFDS) for active control of rotor vibrations. Recently it was shown that the automatically controlled HSFD based on feedback of rotor speed can be a very efficient device for active control of rotor vibration when passing through critical speeds. Although considerable effort has been put into the study of steady-state vibration control, there are few methods in the literature applicable to transient vibration control of rotor-bearing systems. Rotating machinery may experience dangerously high dynamic loading due to the sudden mass unbalance that could be associated with blade loss. Transient run-up and coast down through critical speeds when starting up or shutting down rotating machinery induces excessive bearing loads at criticals. In this paper, PI control is proposed as a regulator for the HSFD system to attenuate transient vibration for both sudden unbalance and transient runup through critical speeds. A complete mathematical model of this closed-loop system is simulated on a digital computer. Results show an overall enhanced behavior for the closed-loop rotor system. Gain scheduling of both the integral gain and the reference input is incorporated into the closed-loop system with the PI regulator and results in an enhanced behavior of the controlled system.

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Hybrid Active Vibration Control of Rotorbearing Systems Using Piezoelectric Actuators

Cited by 4 publications

References 0 publications

Adaptive Influence Coefficient Control of Single-Plane Active Balancing Systems for Rotating Machinery

Adaptive Influence Coefficient Control of Single-Plane Active Balancing Systems for Rotating Machinery

Electromechanical Modeling of Hybrid Piezohydraulic Actuator System for Active Vibration Control

PI Control of HSFDs for Active Control of Rotor-Bearing Systems

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