Showing papers on "Active vibration control published in 2012"
Patent•
16 Mar 2012
TL;DR: In this article, the authors present General Synchronized Vibration (GSV) devices that provide haptic feedback to a user and improve the performance of existing vibratory devices.
Abstract: The disclosure relates to General Synchronized Vibration devices that provide haptic feedback to a user (FIGS. 87-88) and improve the performance of existing vibratory devices. Different actuator types may be employed to provide synchronized vibration, including linear rotary actuators (1102), rotating eccentric mass actuators (1210) including interleaved rotating mass actuators (1250a, b), and rocking mass actuators (490). A controller (502) sends signals to one or more driver circuits to provide adjustment of vibration magnitude, frequency, and direction of the actuators. The system may apply forces onto an object (1100), and a sensor measures a feature (s) of the object. This information is provided to a vibration device controller (FIG. 58), which can then modify the vibration waveform to improve overall system performance. Fourier synthesis can be used to approximate arbitrarily shaped waveforms by controlling the phase and frequency of vibration actuators. These waveforms can include asymmetry where the peak force in one direction is higher than the peak force in another direction (FIG. 44).
147 citations
TL;DR: In this paper, the active aeroelastic flutter analysis and vibration control at the flutter bounds of the supersonic composite laminated plates with the piezoelectric patches are studied.
113 citations
TL;DR: In this paper, a low frequency flexible space platform consisting of folded continuous beams has been designed to serve as a mount for isolating a disturbance source in precision payloads equipped spacecrafts.
113 citations
01 Jan 2012
TL;DR: The extraction of the full and reduced mathematical models of a cantilever beam into MATLAB© from its FE model and the procedure for the design of the controller described in this paper may be extended to control the vibrations of any real life system.
Abstract: Undesired noise and vibrations have a detrimental effect in many areas. Hence the control of vibrations has become a relevant technological challenge. Active vibration control of structures using smart materials is especially in vogue. This involves sensing the motion of the structure using sensors, generating a control signal using a controller and applying a control force on the structure using actuators. To design the control system of any vibrating structure, the mathematical model of the system is required. However, it is difficult to theoretically construct a model of complex structures. On the other hand, it is relatively simpler to model such systems in a Finite Element (FE) environment like ANSYS©. This paper deals with the extraction of the full and reduced mathematical models of a cantilever beam into MATLAB© from its FE model. The full model of the beam is reduced by discarding those modes which do not contribute to the overall response. It is found that the frequency and transient responses of the full and reduced models match closely. Hence the reduced model may be used to represent the system which in turn reduces the computational time. The controller is designed using proportional-integral-derivative theory with output feedback. SIMULINK© is then used to create a working block diagram of the control system and perform the control action. The transient responses of the controlled full and reduced models are then plotted which are found to be in close agreement. The procedure for the design of the controller described in this paper may be extended to control the vibrations of any real life system.
101 citations
TL;DR: In this article, active vibration control of structures using SIFT has been discussed, and the authors propose a method to control the vibration of a building using a SIFT-based SIFT sensor.
Abstract: Undesired noise and vibrations have a detrimental effect in many areas. Hence the control of vibrations has become a relevant technological challenge. Active vibration control of structures using s...
87 citations
TL;DR: In this paper, an active vibration control (AVC) system based on an integral resonant control (IRC) strategy for mitigation of human-induced vibrations in light-weight civil engineering structures, such as floors and footbridges, via proof-mass actuators.
Abstract: SUMMARY
Integral resonant control (IRC) has been recently introduced as a simple, robust and high-performance technique for vibration control of smart structures instrumented with collocated piezoelectric actuator–sensor pairs. This work deals with the design and implementation of an active vibration control (AVC) system based on an IRC strategy for the mitigation of human-induced vibrations in light-weight civil engineering structures, such as floors and footbridges, via proof-mass actuators. This work presents a new AVC strategy that combines an approximate inversion of the proof-mass actuator dynamics with an IRC-based strategy. The result is a control scheme with the following desirable characteristics: (i) the closed-loop system exhibits very high stability margins, (ii) the risk of stroke saturation at low frequencies is significantly reduced so that the saturation nonlinearity, which has to be included to keep the system hardware safe, can be designed to account only for force saturation (i.e. the actuator performance is enhanced), (iii) rigorous stability analysis and systematic design can be proposed and (iv) it is not necessary to measure the actuator force. The stability analysis is carried out using the recently developed stability theorem based on the positive feedback interconnection of systems with negative imaginary frequency response. The control scheme is validated on a full-scale prestressed concrete laboratory structure. Excellent vibration reduction performance is reported for frequency-response-function-based tests and for walking excitations. Copyright © 2010 John Wiley & Sons, Ltd.
78 citations
TL;DR: In this paper, an approach to the control system design of seat suspension systems for the active vibration attenuation is presented, which is based on the reverse dynamics of force actuator and the primary controller.
71 citations
TL;DR: In this paper, the authors investigated the active aeroelastic flutter properties of supersonic plates by using the piezoelectric material and found that the active stiffness and active mass have prominent effects on the flutter characteristics of the su personic plates.
69 citations
TL;DR: In this paper, the active vibration control of conical shells is studied using velocity feedback and linear quadratic regulator methods, and the results show that the active vibrational control of a conical shell can be improved by using a velocity feedback mechanism.
Abstract: In this paper, the active vibration control of conical shells is studied using velocity feedback and linear quadratic regulator methods. Up to now, many researches on the active vibration control o...
61 citations
TL;DR: In this paper, the authors provide a comprehensive review of active vibration control (AVC) for human-induced vibrations in floor structures and investigate the potential for an environmental and economic assessment into the overall impact of incorporating AVC so early on in the building life cycle.
56 citations
TL;DR: In this article, the authors presented an innovative low-frequency magnetostrictive inertial actuator, which is able to significantly multiply the amplitude of the elongation of the magnetstrictive bar and to extend its functioning well below the working frequencies of traditional devices.
Abstract: Magnetostrictive inertial actuators are profitably used in applications of vibration control. However their use is limited to high frequencies because of problems related to control stability and to small exertable forces. This paper presents the design of an innovative low-frequency magnetostrictive inertial actuator. With respect to traditional magnetostrictive actuators it is able to significantly multiply the amplitude of the elongation of the magnetostrictive bar and to extend its functioning well below the working frequencies of traditional devices. The design of the actuator has been optimized through both an analytical model and a finite element model taking into account all the design parameters. The optimized low-frequency magnetostrictive inertial actuator has then been produced and its frequency response compared to that of a traditional magnetostrictive actuator made up of the same components (except for the supporting structure).
TL;DR: In this article, a characteristic model based nonlinear golden section adaptive control (CMNGSAC) algorithm is implemented to suppress the vibration of a flexible Cartesian smart material manipulator driven by a ballscrew mechanism using an AC servomotor.
Book•
05 Mar 2012
TL;DR: In this article, the authors present a simulation study of MPC implementation for Vibration Control and simulate the active structure of an active structure with a model predictive Vibrration Control (MPC).
Abstract: 1. Introduction.- 2. Basics of Vibration Dynamics.- 3. Smart Materials in Active Vibration Control.- 4. Algorithms in Active Vibration Control.- 5. Laboratory Demonstration Hardware for AVC.- 6. Basic MPC Formulation.- 7. Stability and Feasibility of MPC.- 8. Efficient MPC Algorithms.- 9. Applications of Model Predictive Vibration Control.- 10. MPC Implementation for Vibration Control.- 11. Simulation Study of Model Predictive Vibration Control.- 12. Experimental Model Predictive Vibration Control.- A. FE Modeling of the Active Structure.- B. MPC Code Implementation Details.
TL;DR: In this paper, the authors investigated the potential improvement of mechanical damping of open rotor composite fan blades by comparing two integrated passive damping systems: shape memory alloy wires and piezoelectric shunt circuits.
Abstract: Emission reduction from civil aviation has been intensively addressed in the scientific community in recent years. The combined use of novel aircraft engine architectures such as open rotor engines and lightweight materials offer the potential for fuel savings, which could contribute significantly in reaching gas emissions targets, but suffer from vibration and noise issues. We investigated the potential improvement of mechanical damping of open rotor composite fan blades by comparing two integrated passive damping systems: shape memory alloy wires and piezoelectric shunt circuits. Passive damping concepts were first validated on carbon fibre reinforced epoxy composite plates and then implemented in a 1:5 model of an open rotor blade manufactured by resin transfer moulding (RTM). A two-step process was proposed for the structural integration of the damping devices into a full composite fan blade. Forced vibration measurements of the plates and blade prototypes quantified the efficiency of both approaches, and their related weight penalty.
TL;DR: In this article, an active vibration control (AVC) via inertial actuators is considered for the mitigation of excessive vibrations in civil engineering structures, which is based on two control loops: (i) a loop, closed within the actuator, designed to artificially modify the actuators frequency response according to its maximum stroke and force and the structure dynamics, and (ii) loop designed to impart damping to the structure.
TL;DR: In this paper, the authors proposed an H2 norm approach for the actuator and sensor placement to maximize the norms of the controlled modes and reduce spillover problems by taking into account the residual modes and minimizing their H2 norms.
Abstract: In active vibration control of smart structures, the actuator and sensor placement is a key point of the control system design. Even the most robust control logics could easily make a structure unstable if the actuators and sensors were not correctly positioned. The objective of this paper is to propose an H2 norm approach for the actuator and sensor placement. Unlike most modal H2 norm actuator and sensor placement methodologies, this work aims not only to maximize the norms of the controlled modes but also to reduce spillover problems by taking into account the residual modes and minimizing their H2 norms. It discusses the optimal actuator and sensor configuration in a finite element model of a square plate fixed on three sides with piezoelectric patch actuators and acceleration sensors. Finally, downstream of the actuator and sensor positioning, IMSC, PPF and NDF controls have been tested and discussed.
TL;DR: In this paper, a new type of electroactive material, dielectric elastomer, has been proposed, which has the potential to provide effective actuation for a wide range of applications.
Abstract: Dielectric elastomer is a new type of electroactive material, which has the potential to provide effective actuation for a wide range of applications. The force, strain and speed of response proper...
TL;DR: In this article, the authors describe the application of PZT actuator in active engine mount mainly, and the simulation result show that the active PZTs engine mount has a very good isolation performance, and can reduce around 80% vibration, and act very well at both lower and higher frequency.
TL;DR: In this paper, an active hard mount suspension with a feedback strategy based on sensor fusion is proposed that uses the acceleration signal at low frequencies and the force signal at high frequencies to increase the damping ratio of internal vibration modes and to provide a high support stiffness.
TL;DR: In this paper, an experimental set-up has been developed to obtain the active vibration suppression of smart beams using the piezoelectric patch structure, which consists of a beam as the host structure and piezoceramic patches as actuation and sensing elements.
Abstract: Vibration suppression of smart beams using the piezoelectric patch structure is presented in the present work. The smart system consists of a beam as the host structure and piezoceramic patches as the actuation and sensing elements. An experimental set-up has been developed to obtain the active vibration suppression of smart beam. The set-up consists of a smart cantilever beam, the data acquisition system and a LabView based controller. Experiments are performed for different beam specimen. The coupled effcient layerwise (zigzag) theory is used for theoretical finite element modeling. The finite element model is free of shear locking. The beam element has two nodes with four mechanical and a variable number of electric degrees of freedom at each node. In the thickness direction, the electric field is approximated as piecewise linear across an arbitrary number of sub-layers in the piezoelectric layers. Cubic Hermite interpolation is used for the deflection, and linear interpolation is used for the axial displacement and the shear rotation. Undamped Natural Frequencies are obtained by solving the Eigen Value problem using Subspace Iteration method for cantilever beam. A state space model characterizing the dynamics of the physical system is developed from experimental results using PID approach for the purpose of control law design. The experimental results obtained by using the active vibration control system have demonstrated the validity and effciency of PID controller. Experiments are conducted to compare the controlling of various cantilever beams of different sizes. It shows that the present actuator and sensor based control method is effective and the LabView control plots for various beams can be used as a benchmark for analytical work. The results are compared with ABAQUS software and 1D Finite element formulation based on zigzag theory.
TL;DR: The non-parametric models of the flexible plate structure developed and validated will be used as the representation of the transfer function of the system in subsequent investigations for the development of active vibration control strategies for vibration suppression in flexible structures.
TL;DR: In this article, an analysis and design of a tuneable vibration absorber composed by a flexible beam with a clamping block in the middle and two masses symmetrically mounted at the two ends is concerned.
TL;DR: In this article, a finite element model of a smart two-dimensional plate instrumented with piezoelectric patches is derived using Hamilton's variational principle, and coupled equations of motion are uncoupled using modal analysis.
TL;DR: In this article, a system identification and vibration control strategy for a flexible manipulator with a collocated piezoelectric sensor/actuator pair is presented, where an iteratively implemented genetic algorithm is applied to the system identification problem of the flexible manipulators.
Abstract: A system identification and vibration control strategy for a flexible manipulator with a collocated piezoelectric sensor/actuator pair is presented in this paper. An iteratively implemented genetic algorithm is applied to the system identification problem of the flexible manipulator. A control law based upon positive position feedback is developed for vibration suppression. A minimization criterion based on the H1-norm of the closed loop system is solved by a genetic algorithm to derive optimal controller parameters. Numerical simulations are performed to verify the effectiveness of the system identification and vibration controller. (Some figures may appear in colour only in the online journal)
TL;DR: In this article, a back propagation neural network (BPNN) based proportional-derivative (PD) algorithm is applied to suppress the vibration of a flexible piezoelectric beam.
TL;DR: In this paper, a SMA-based oscillator is proposed to absorb the vibration energy input into the primary system, and the performance of the SMA oscillator at high temperatures is close to that of a linear oscillator, while at low temperatures it behaves as a regular damper.
TL;DR: In this article, a methodology is presented for the cancellation of road noise, from the analysis of vibration transmission paths for an automotive suspension to the design of an active control system using inertial actuators on a suspension to reduce the vibrations transmitted to the chassis.
TL;DR: In this paper, a nonlinear energy-based hysteresis model is developed for a piezoelectric stack actuator and model predictive sliding mode control is applied to force the system state to reach a sliding surface in an optimal manner and track the reference signal accurately thereafter.
Abstract: Currently, piezoelectric actuators are being used in many applications from precision positioning control to active vibration control of large space structures. They can take the form of a solid-state device and are conveniently controlled by a voltage input. In spite of their relative ease of control, positioning accuracy and actuator longevity can be compromised by the hysteresis. Thus, the primary objective of this research is to minimize the hysteretic effect of a piezoelectric actuator in order to obtain a near linear relationship between the input voltage and the output displacement. The reduction of the hysteresis is accomplished by a newly developed control methodology named model predictive sliding mode control. A nonlinear energy-based hysteresis model is developed for a piezoelectric stack actuator and model predictive sliding mode control is applied to force the system state to reach a sliding surface in an optimal manner and track the reference signal accurately thereafter. To validate this new approach, simulations and experiments are conducted and the results highlight significantly improved hysteresis reduction in the displacement control of the piezoelectric stack actuator.
TL;DR: A controller order reduction technique is proposed for reducing the complexity of the nominal H∞ controller without degrading the performance.
Abstract: This brief presents a procedure for design and tuning of reduced orders H∞ feedforward compensators for active vibration control systems subject to wide band disturbances. The procedure takes in account the inherent “positive” feedback coupling between the compensator system and the measurement of the image of the disturbance. It also takes advantage of the availability of reliable models obtained by system identification. A controller order reduction technique is proposed for reducing the complexity of the nominal H∞ controller without degrading the performance. Experimental results obtained on an active vibration control system for a flexible mechanical structure will illustrate the procedure.
TL;DR: In this paper, a rod cylinder based pneumatic driving scheme is proposed to suppress the vibration of a flexible smart beam, where the Pulse Code Modulation (PCM) method is employed to control the motion of the cylinder's piston rod for simultaneous positioning and vibration suppression.