Vibration Control Strategies for Proof-mass Actuators

Abstract

Proof-mass actuators have been considered for a broad range of structural vibration control problems, from the seismic protection of tall buildings, to the improvement of metal machining productivity by increasing the stability of self-excited vibrations known as chatter. In general this broad range of potential applications means that a variety of controllers have been proposed, without drawing direct comparisons with other controller designs that have been considered for different applications.This article takes three controllers that are potentially suitable for the machining chatter problem: direct velocity feedback, tuned-mass-damper control (or vibration absorber control), and active-tuned-mass-damper control (or active vibration absorber control). These control strategies are restated within the more general framework of Virtual Passive Control. Their performance is first compared using root locus techniques, with a model based upon experimental data that includes the low frequency dynamics of the proof mass. The frequency response of the test structure is then illustrated under open and closed-loop conditions. The application of the control strategies to avoid machine-tool chatter vibrations is then discussed, without going into detail on the underlying physical mechanisms of chatter. It is concluded that virtual passive absorber control is more straightforward to implement than virtual skyhook damping, and may be better suited to the problem of machining chatter.

Tracking control of an electro-hydraulic shaking table system using a combined feedforward inverse model and adaptive inverse control for real-time testing

“…A linear variable differential transformer (LVDT) was attached to the hydraulic actuator to measure its displacement and the acceleration was measured by an accelerometer mounted on the table. The data acquisition and implementation of the digital con-troller were conducted on an xPC target based on MATLAB/Simulink rapid prototyping [33,35,36]. Data acquisition was accomplished using an Advantech AD card PCL-816 and DA card PCL-726.…”

Feed-forward inverse control for transient waveform replication on electro-hydraulic shaking table

“…The objective of control is to keep the acceleration measured signal of the EHST acceleration closed-loop system following the desired acceleration command signal as closely as possible. The implementation of these digital controllers are conducted on xPC target based on MATLAB/Simulink rapid prototyping, which can provide a high-performance, host-target prototyping environment that enables Simulink and Stateflow models to be connected to physical systems and executed in real time on PC-compatible hardware (Huyanan and Sims, 2007; Shen et al 2008). The sampling interval of the digital controller for EHST is selected as 1000 Hz.…”

Inertial Actuator with Virtual Mass for Active Vibration Control

“…Inertial actuators (IAs) are efficient control units in active noise and vibration control systems for reducing sound and vibration in the low frequency range. [1][2][3][4][5][6][7][8][9] The main advantage of the use of IAs is that there is no requirement of any other structure to react off. 1,2,5 At frequencies above the natural frequency of the IA, it can effectively generate a constant actuation force and in-phase with the input driving voltage.…”