Vibration Control of a Flexible Structure Using ER Dampers

1999 ◽  
Vol 121 (1) ◽  
pp. 134-138 ◽  
Author(s):  
Seung-Bok Choi
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Sliding Mode ◽  
Shear Mode ◽  
Flexible Beam ◽  
Short Columns ◽  
Flexible Beam System ◽  
Er Damper ◽  
External Forces ◽  
Er Fluid

This technical brief addresses the vibration control of a flexible beam structure using ER (electro-rheological) dampers. A clamped-clamped flexible beam system supported by two short columns is considered. An ER damper which is operated in shear mode is designed on the basis of Bingham model of the ER fluid, and attached to the flexible beam. After deriving the governing equation of motion and associated boundary conditions, a sliding mode controller is formulated to effectively suppress the vibration of the beam caused by external forces. In the formulation of the controller, parameter variations such as frequency deviation are treated to take into account the robustness of control system. The effectiveness of the proposed control system is confirmed by both simulation and experimental results.

An Experimental Study of Tendon Vibration Control System for Flexible Space Structures

1991 ◽  
Author(s):  
Yoshisada Murotsu ◽  
Hiroshi Okubo ◽  
Kei Senda
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Vibration Control ◽  
Transfer Functions ◽  
Mimo Systems ◽  
Experimental System ◽  
Space Structures ◽  
Flexible Beam ◽  
Tendon Vibration ◽  
Large Space

Abstract The idea of a tendon vibration control system for a beam-like flexible space structure has been proposed. To verify the feasibility of the concept, an experimental tendon control system has been constructed for the vibration control of a flexible beam simulating Large Space Structures (LSS). This paper discusses modeling, identification, actuator disposition, and controller design for the experimental system. First, a mathematical model of the whole system of the beam and tendon actuator is developed through a finite element method (FEM). Second, to obtain an accurate mathematical model for designing a controller, unknown characteristic parameters are estimated by using an output error method. The validity of the proposed identification scheme is demonstrated by good agreement between the transfer functions of the experimental system and an identified model. Then, disposition of actuators is discussed by using the modal cost analysis. Finally, controllers are designed for SISO and MIMO systems. The feasibility of the proposed controller is verified through numerical simulation and hardware experiments.

BINGHAM AND RESPONSE CHARACTERISTICS OF ER FLUIDS IN SHEAR AND FLOW MODES

2001 ◽  
Vol 15 (06n07) ◽  
pp. 1017-1024 ◽  
Author(s):  
H. G. LEE ◽  
S. B. CHOI ◽  
S. S. HAN ◽  
J. H. KIM ◽  
M. S. SUH
Keyword(s):  
Electric Fields ◽  
Flow Mode ◽  
Shear Mode ◽  
Damping Force ◽  
Response Characteristics ◽  
Operating Modes ◽  
Field Dependent ◽  
Different Temperatures ◽  
Er Damper ◽  
Er Fluid

This paper presents field-dependent Bingham and response characteristics of ER fluid under shear and flow modes. Two different types of electroviscometers are designed and manufactured for the shear mode and flow mode, respectively. An ER fluid consisting of soluble chemical starches (particles) and silicon oil is made and its field-dependent yield stress is experimentally distilled at two different temperatures using the electroviscometers. Time responses of the ER fluid to step electric fields are also evaluated under two operating modes. In addition, a cylindrical ER damper, which is operated under the flow mode, is adopted and its measured damping force is compared with predicted one obtained from Bingham model of the shear and flow mode, respectively.

Investigation of active vibration control system for trailed two-wheeled implements

2011 ◽  
Vol 226 (1) ◽  
pp. 55-65 ◽  
Author(s):  
H-J Kim
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Sliding Mode ◽  
Model Simulation ◽  
Active Vibration Control ◽  
The Body ◽  
Actual Performance ◽  
The Road ◽  
Force Tracking ◽  
Active Vibration

This paper presents an active vibration control (AVC) system for trailed two-wheeled implements (TTWI) equipped with high precision electronic devices. With the aim of isolating disturbance forces to the devices, a hydraulically actuated vibration control system is devised. In order to suppress vibratory motions to the body components, considering the TTWI system characteristics, a vibration control and a force tracking control strategy is adopted. As the vibration controller, the adaptive and skyhook control schemes are applied. From full order and reduced order model for the actuating module, as the tracking controller, the sliding mode control scheme is adopted regarding parameter variations. On the basis of the roll plane TTWI system model, simulation work is performed. Finally, after implementation of the experimental setup with the TTWI system and the road simulating module considering practical requirements, actual performance of the devised AVC system is evaluated in various disturbance conditions.

scholarly journals Coriolis Force Sliding Mode Control Method for the Rotary Motion of the Central Rigid Body-Flexible Cantilever Beam System in TBM

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Chuanlu Zhou ◽  
Long Qin ◽  
Ming Chen ◽  
Jingxiang Zhang
Keyword(s):  
Rigid Body ◽  
Coriolis Force ◽  
Vibration Mode ◽  
Control Method ◽  
Sliding Mode ◽  
Flexible Beam ◽  
Beam Model ◽  
Beam Vibration ◽  
Beam System ◽  
Flexible Beam System

Beam slab structure is often encountered in a complex tunnel boring machine. Beam slab structure is subject to dynamic load, which is easy to cause fatigue damage and affect its service life. Therefore, it is necessary to control the vibration of this kind of beam slab structure. In this study, the central rigid body-flexible beam model is established for the rotating beam and plate rotating around the y-axis. Based on the Hamilton variational principle, the dynamic equation of the central rigid body-flexible beam system is established, and the dynamic model of the central rigid body-flexible beam system considering the influence of Coriolis force and centrifugal force is given. The vibration control of the central rigid body-flexible beam system is studied. The vibration mode of the rotating Euler Bernoulli beam is determined by using the elastic wave and vibration mode theory. The influence of the rotating motion on the beam vibration is analyzed, and the variable structure control law is designed to suppress the beam vibration. Numerical simulation results show that the control method can effectively suppress the first-order and second-order vibration of the beam and verify the effectiveness of the control strategy.

Sliding Mode Control of Motion and Vibration Without Sensors

1997 ◽  
Author(s):  
Osamu Ohnuki ◽  
Kenzo Nonami
Keyword(s):  
Control System ◽  
Control Problem ◽  
Vibration Control ◽  
Sliding Mode ◽  
Sensorless Control ◽  
Robot Arm ◽  
State Variables ◽  
Robust Control System ◽  
Nonlinear Robust ◽  
Controlled Object

Abstract In this paper, a method to realize the motion and vibration control without sensors is proposed. Sensorless control is generally realized by estimating the state of the system from the measured current in the actuator by means of an observer. It is possible to estimate all state variables because of dynamic interaction in the controlled object. Then we realize nonlinear robust control system based on the observer. In this paper, first we formulate sensorless control system. As controlled objects we deal with a multi-degree-of-freedom structure as a vibration control problem and a single link robot arm as a motion control problem, respectively, and we carry out numerical simulations. Moreover, we also verify the possibility of realization of sensorless control by experiments.

scholarly journals Hardware experiment of a tendon vibration control system for a flexible beam.

1990 ◽  
Vol 56 (525) ◽  
pp. 1139-1146
Author(s):  
Yoshisada MROTSU ◽  
Akira MITSUYA ◽  
Fuyuto TERUI ◽  
Kei SENDA ◽  
Takehito YAMAGUCHI
Keyword(s):  
Control System ◽  
Vibration Control ◽  
Flexible Beam ◽  
Tendon Vibration

Design of a novel adaptive fuzzy sliding mode controller and application for vibration control of magnetorheological mount

2014 ◽  
Vol 228 (13) ◽  
pp. 2285-2302 ◽  
Author(s):  
Do Xuan Phu ◽  
Nguyen Vien Quoc ◽  
Joon-Hee Park ◽  
Seung-Bok Choi
Keyword(s):  
Sliding Mode Control ◽  
Vibration Control ◽  
Sliding Mode ◽  
Shear Mode ◽  
Sliding Mode Controller ◽  
Experimental Realization ◽  
Mode Control ◽  
Fuzzy Sliding Mode ◽  
Interval Type

This paper presents vibration control of a mixed-mode magnetorheological fluid-based mount system using a new robust fuzzy sliding mode controller. A novel model of controller is built based on adaptive hybrid control of interval type 2 fuzzy controller incorporating with a new modified sliding mode control. The interval type 2 fuzzy is optimized for computational cost by using enhanced iterative algorithm with stop condition, and a new modified switching surface of sliding mode control is designed for preventing the chattering of the system. The controller is then experimentally implemented under uncertain conditions in order to evaluate robust vibration control performance. In addition, in order to demonstrate the effectiveness of the proposed controller, two fuzzy sliding mode control algorithms proposed by Huang and Chan are adopted and modified. The principal control parameters of three controllers are updated online by adaptation laws to meet requirements of magnetorheological mount system which has two operation modes: flow mode and shear mode. It is shown from experimental realization of three controllers that the proposed control strategy performs the best under uncertain conditions compared with two other modified controllers. This merit is verified by presenting vibration control performances in both time and frequency domains.

scholarly journals Adaptive Robust Sliding Mode Vibration Control of a Flexible Beam Using Piezoceramic Sensor and Actuator: An Experimental Study

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Ruo Lin Wang ◽  
H. Gu ◽  
G. Song
Keyword(s):  
Experimental Study ◽  
Vibration Control ◽  
Lead Zirconate Titanate ◽  
Sliding Mode ◽  
Direct Method ◽  
Experimental Results ◽  
Flexible Beam ◽  
Small Magnitude ◽  
Lyapunov’S Direct Method ◽  
Sliding Mode Controllers

This paper presents an experimental study of an adaptive robust sliding mode control scheme based on the Lyapunov’s direct method for active vibration control of a flexible beam using PZT (lead zirconate titanate) sensor and actuator. PZT, a type of piezoceramic material, has the advantages of high reliability, high bandwidth, and solid state actuation and is adopted here in forms of surface-bond patches for vibration control. Two adaptive robust sliding mode controllers for vibration suppression are designed: one uses a discontinuous bang-bang robust compensator and the other uses a smooth compensator with a hyperbolic tangent function. Both controllers guarantee asymptotic stability, as proved by the Lyapunov’s direct method. Experimental results verified the effectiveness and the robustness of both adaptive sliding mode controllers. However, from the experimental results, the bang-bang robust compensator causes small-magnitude chattering because of the discontinuous switching actions. With the smooth compensator, vibration is quickly suppressed and no chattering is induced. Furthermore, the robustness of the controllers is successfully demonstrated with ensured effectiveness in vibration control when masses are added to the flexible beam.

A Preliminary Parametric Study of Electrorheological Dampers

1994 ◽  
Vol 116 (3) ◽  
pp. 570-576 ◽  
Author(s):  
Z. Lou ◽  
R. D. Ervin ◽  
F. E. Filisko
Keyword(s):  
Cross Section ◽  
Mixed Mode ◽  
Flow Mode ◽  
Shear Mode ◽  
Zero Field ◽  
Damping Force ◽  
Bingham Plastic ◽  
Control Effectiveness ◽  
Er Damper ◽  
Er Fluid

In approaching the design of an electrorheology-based, semi-active suspension, the electrorheological component (ER damper) can be built as either a flow-mode, shear-mode, or mixed-mode type of damper. The source of damping force in the flow-mode is exclusively from flow-induced pressure drop across a valve, while that in the shear-mode is purely from the shear stress on a sliding surface. The dynamics of the fluid flow are included in the derivation of the zero-field damping forces. The control effectiveness is found to be strongly related to the dynamic constant (which is proportional to the square root of the vibration frequency) and, for shear-and flow-mode dampers, the ratio of the piston area to the cross-section of the ER control gap. To achieve the same performance, a flow-mode ER damper is not as compact and efficient as a shear-mode ER damper. With the same ER damping force, a mixed-mode damper is more compact than a shear-mode damper. However, the mixed-mode damper does not have as a low zero-field damping force as the shear-mode damper. The analysis is based on the assumption that the ER fluid is Bingham plastic.

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