Vibration Reduction of Flexible Structures Using Extended Input Shaper and Smart Materials

2001 ◽  
Author(s):  
G. Song ◽  
B. Kotejoshyer ◽  
J. Fei
Keyword(s):  
Smart Materials ◽  
Vibration Suppression ◽  
Flexible Structures ◽  
Flexible Beam ◽  
Smart Sensor ◽  
New Approach ◽  
Active Vibration Suppression ◽  
Command Input ◽  
Active Vibration ◽  
Smart Actuator

Abstract This paper presents a new approach of integrating the method of command input shaping and the technique of active vibration suppression for vibration reduction of flexible structures during slew operations. The control object is a flexible composite beam driven by a high torque DC motor with the presence of nonlinearities such as backlash and stick-slip type of friction. Two piezoelectric patches are bonded on the surface of the flexible beam near its cantilevered end and are used as the smart actuator and the smart sensor respectively. In this new approach, the method of command input shaping is used to modify the existing command so that less vibration will be caused by the command itself. To overcome the nonlinearities associated with the DC motor, an extended shaper is designed. The technique of active vibration suppression using smart materials is used to actively control the vibration during and after the slew. With this pair of smart actuator and smart sensor, a strain rate feedback (SRF) controller is designed for active vibration suppression. With the extended Zero Vibration Derivative (ZVD) shaper and the SRF controller, the proposed new approach can effectively reduce the vibration of the flexible beam during slew operations.

Gray box identification of flexible structures: application to robust active vibration suppression control

2001 ◽  
Vol 30 (8) ◽  
pp. 1203-1220 ◽  
Author(s):  
A. Forrai ◽  
S. Hashimoto ◽  
A. Isojima ◽  
H. Funato ◽  
K. Kamiyama
Keyword(s):  
Vibration Suppression ◽  
Flexible Structures ◽  
Active Vibration Suppression ◽  
Active Vibration

Recent developments in semi-active control of magnetorheological materials-based sandwich structures: A review

2020 ◽  
pp. 089270572093074
Author(s):  
Rajeshkumar Selvaraj ◽  
Manoharan Ramamoorthy
Keyword(s):  
Vibration Control ◽  
Smart Materials ◽  
Vibration Suppression ◽  
Sandwich Structures ◽  
Flexible Structures ◽  
Core Layer ◽  
Field Dependent ◽  
Recent Developments ◽  
Active Vibration ◽  
Stiffness And Damping

Magnetorheological (MR) materials are kinds of smart materials whose rheological characteristics are controllable with the application of external magnetic fields. In the last few decades, MR materials are well established as one of the leading smart materials for use in adaptive sandwich structures and systems for salient vibration control. This article reviews the semi-active vibration suppression of flexible structures with smart materials of MR fluids (MRFs) and MR elastomers (MREs). Stiffness and damping characteristics of beams, plates, panels, and shells integrating the core layer of MRFs and MREs are discussed in terms of field-dependent controllability. To keep the integrity of the knowledge, this review includes a study on free and forced vibration characteristics of sandwich structures with fully and various configurations of partial MR treatments, stability analysis of MR sandwich structures under rotating conditions and developments in identifying the optimal locations of MR sandwich structures for better vibration control are also discussed. Further, this article focuses on the role of carbon nanotubes in enhancing the field-dependent stiffness and damping properties of MR materials. A few of the most relevant research articles are reviewed and presented here briefly.

Adaptive active vibration suppression of flexible beam structures

2008 ◽  
Vol 222 (3) ◽  
pp. 357-364 ◽  
Author(s):  
Y Xia ◽  
A Ghasempoor
Keyword(s):  
Vibration Control ◽  
Time Delays ◽  
Vibration Suppression ◽  
Control Strategies ◽  
Linear Optimization ◽  
Active Vibration Control ◽  
Flexible Beam ◽  
Active Vibration Suppression ◽  
Active Vibration ◽  
Suppression System

Vibration control strategies strive to reduce the effect of harmful vibrations on machinery and people. In general, these strategies are classified as passive or active. Although passive vibration control techniques are generally less complex, there is a limit to their effectiveness. Active vibration control strategies, on the other hand, can be very effective but require more complex algorithms and are especially susceptible to time delays. The current paper introduces a novel vibration suppression system using non-linear optimization. The proposed methodology eliminates the need for a feedback loop and the sensitivity to time delays. The system has been evaluated experimentally and the results show the validity of the proposed methodology.

Optimized Modal Synchronized Switching Control for Flexible Structures

2016 ◽  
Author(s):  
G. Cazzulani ◽  
F. Braghin ◽  
F. Mazzocchi
Keyword(s):  
Vibration Suppression ◽  
Flexible Structures ◽  
Circuit Complexity ◽  
Harmonic Excitation ◽  
Control Performance ◽  
Active Vibration Suppression ◽  
Suppression Technique ◽  
Active Vibration ◽  
Modal Coordinates ◽  
Synchronized Switching

This paper focuses on the Synchronized Switching Damping (SSD) control, a semi-active vibration suppression technique based on the coupling between a mechanical structure and piezoelectric actuators. This control family is optimized for structures subjected to mono-harmonic excitation. Anyway, in the last years, different solutions to address multi-harmonic and multi-modal excitation have been developed. One of them is the so-called Modal SSD, where the switches of the shunting circuit are governed by the behavior of the modal coordinates of the structure. Although the control performance is good, this paper shows that there are still some issues to be solved. For this reason, the paper proposes a modified version of this control strategy able to improve the control performance without increasing the circuit complexity. The proposed solution is firstly described in detail and then tested and compared with the existing ones on the numerical model of a cantilever beam.

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