A Single-Step Automatic Tuning Algorithm for the Delayed Resonator Vibration Absorber

1999 ◽  
Author(s):  
Martin Hosek ◽  
Nejat Olgac
Keyword(s):  
Structural Parameters ◽  
Active Vibration Control ◽  
Single Step ◽  
Automatic Tuning ◽  
External Information ◽  
Flexible Beam ◽  
Controlled System ◽  
Control Approach ◽  
Active Vibration ◽  
Resonator Vibration

Abstract The delayed resonator (DR) is an active vibration control approach where a passive mass-spring-damper arrangement is converted into an undamped real-time tunable dynamic absorber using partial state feedback with time delay. In the presented work, robustness of the control strategy against fluctuations in the structural parameters of the controlled system is addressed. A single-step automatic tuning algorithm based on on-line parameter identification is developed as a means of increasing robustness against uncertainties and variations in the mechanical properties of the absorber arrangement. The tuning process is completed within the absorber section of the controlled system with no external information from the primary structure. Implementation of the algorithm is demonstrated experimentally on a clamped-clamped flexible beam.

Comparison of Active and Hybrid Vibration Confinement With Conventional Active Vibration Control

1999 ◽  
Author(s):  
Lawrence R. Corr ◽  
William W. Clark
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Numerical Study ◽  
Active Vibration Control ◽  
Piezoelectric Actuators ◽  
Control Technique ◽  
Flexible Beam ◽  
Velocity Feedback ◽  
Active Vibration ◽  
Piezoelectric Actuators And Sensors

Abstract This paper presents a numerical study in which active and hybrid vibration confinement is compared with a conventional active vibration control method. Vibration confinement is a vibration control technique that is based on reshaping structural modes to produce “quiet areas” in a structure as opposed to adding damping as in conventional active or passive methods. In this paper, active and hybrid confinement is achieved in a flexible beam with two pairs of piezoelectric actuators and sensors and with two vibration absorbers. For comparison purposes, active damping is achieved also with two pairs of piezoelectric actuators and sensors using direct velocity feedback. The results show that both approaches are effective in controlling vibrations in the targeted area of the beam, with direct velocity feedback being slightly more cost effective in terms of required power. When combined with passive confinement, however, each method is improved with a significant reduction in required power.

Experimental Study of Active Vibration Control of a Flexible Beam System Using Iterative Learning Algorithm

2015 ◽  
Vol 660 ◽  
pp. 356-360 ◽  
Author(s):  
Mohd Sazli Saad ◽  
Hishamuddin Jamaluddin ◽  
Intan Zaurah Mat Darus ◽  
Irfan Abd Rahim
Keyword(s):  
Learning Algorithm ◽  
Active Vibration Control ◽  
Iterative Learning ◽  
The Self ◽  
Flexible Beam ◽  
Beam System ◽  
Control Schemes ◽  
Self Tuning ◽  
Active Vibration ◽  
Flexible Beam System

Experimental studies are conducted on active vibration control using self-tuning proportional integral derivative and self-tuning proportional iterative learning algorithm control schemes to suppress vibration on a flexible beam via real-time computer control. An experimental rig is developed to investigate controller performance when a change in the dynamic behavior of the flexible beam system occurs. The performance of the self-tuning control schemes is validated experimentally and compared with that of conventional control schemes through the use of an iterative learning algorithm. Experimental results clearly reveal the effectiveness and robustness of the self-tuning control schemes over conventional control schemes.

Study on Vibration Control of a Flexible Cantilever Beam Based on Fuzzy PID

2013 ◽  
Vol 421 ◽  
pp. 579-584 ◽  
Author(s):  
Xian Jun Sheng ◽  
Sheng Zhong ◽  
Ke Xin Wang ◽  
Tao Jiang
Keyword(s):  
Vibration Control ◽  
External Disturbance ◽  
Active Vibration Control ◽  
Flexible Beam ◽  
Fuzzy Pid ◽  
Aerospace Vehicles ◽  
External Interference ◽  
Aircraft Wings ◽  
Vibration Effect ◽  
Active Vibration

The overall performance of large aerospace vehicles is determined to a great extent by the wings structure of aircrafts. In order to prevent wings vibration due to external interference, schemes of combined fuzzy-PID and fuzzy adapt PID controllers are proposed based on flexible beam structure. The MATLAB simulation model demonstrates that the proposed controllers not only has good dynamic characteristics, but also reduce the vibration effect greatly caused by external disturbance, which lay the foundation for the active vibration control of aircraft wings.

Integrated Mechanism and Control Approach for Minimum Flexural Vibrations in Slewing Space Structures

1992 ◽  
Author(s):  
L. F. Yang ◽  
M. Chew ◽  
J. N. Juang
Keyword(s):  
Gear Ratio ◽  
Single Step ◽  
Space Structures ◽  
Flexible Beam ◽  
Solar Panels ◽  
Mechanical Device ◽  
Flexible Space Structures ◽  
Control Approach ◽  
Double Beam ◽  
Flexural Vibrations

Abstract An integrated single-step approach to the synthesis of a mechanical device and a controller is presented. The mechanical device consists of a noncircular gear pair that acts as a varying gear ratio transmission between an electro-mechanical actuator and a flexible structure. Such a system has been introduced as an application in minimizing flexura] vibrations in the slewing maneuver of flexible space structures such as large solar panels and satellites in space. Only a simple regulator-type feedback controller is called for to control this complex electro-mechanical-and-structural system and the purpose is to design this complex system in an integrated procedure to achieve low flexural vibrations of the structure. Simulations of the slewing control tasks for two different flexible space structures are presented: a single planar flexible beam; and a planar flexible articulated double-beam.

Active Vibration Control of the Axially Moving String by Wave Cancellation

1993 ◽  
Author(s):  
C. H. Chung ◽  
C. A. Tan
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
Closed Form Expression ◽  
Control Law ◽  
Closed Loop System ◽  
Controlled System ◽  
Axially Moving String ◽  
Active Vibration ◽  
Axially Moving ◽  
Actuation Devices

Abstract Active vibration control of an axially moving string by wave cancellation is presented. The control problem is formulated in the frequency domain. An exact, closed-form expression for the transfer function of the closed-loop system, consisting of the flexible structure, a feedback control law and the dynamics of the sensing and actuation devices, is derived. It is shown that all vibration modes can be stabilized and that the controlled system has no resonance. Moreover, the designed controller is applicable to the control of the string transverse vibration under various kinds of loading and constraint conditions. Results for the response of the controlled string under different excitations are presented and discussed along with the wave propagation and cancellation characteristics.

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