Sliding Mode Control of a Gossamer Structure Using Smart Materials

2004 ◽  
Vol 10 (8) ◽  
pp. 1199-1220 ◽  
Author(s):  
Akhilesh K. Jha ◽  
Daniel J. Inman
Keyword(s):  
Smart Materials ◽  
Polyvinylidene Fluoride ◽  
Vibration Suppression ◽  
Sliding Mode ◽  
Fiber Composite ◽  
Piezoelectric Actuators ◽  
System Structure ◽  
Mode Shapes ◽  
Space Applications ◽  
Piezoelectric Actuators And Sensors

Gossamer structures have been a subject of renewed interest for space applications because of their low weights, on-orbit deploying capabilities, and minimal stowage volumes. In this study, vibration suppression of an inflated structure using piezoelectric actuators and sensors has been attempted. These actuators and sensors can be suitably used for gossamer structures since they can conform to curved surfaces and provide distributed actuation and sensing capabilities. Using the natural frequencies and mode shapes of the system (structure, actuators, and sensors), a state-space model is derived. For designing a robust vibration controller, we used a sliding mode technique. The derivations of the sliding model controller and observer are presented in details. Finally, by means of numerical analysis, the method was demonstrated for an inflated torus considering Macro-Fiber Composite (MFC™) as actuators and Polyvinylidene Fluoride (PVDF) as sensors. The simulation studies show that the piezoelectric actuators and sensors are suitable for vibration suppression of an inflatable torus. The robustness properties of the controller and observer against the parameter uncertainty and disturbances are also studied.

Smart Materials-Based Structural Vibration Isolation for Minimizing Product Quality Variation Using H∞-Based Optimal Control

Manufacturing ◽  
2002 ◽  
Author(s):  
J. A. Turso ◽  
J. T. Roth
Keyword(s):  
Smart Materials ◽  
Vibration Isolation ◽  
Piezoelectric Actuators ◽  
Structural Vibration ◽  
Band Model ◽  
Manufacturing Equipment ◽  
Patch Type ◽  
Simulation Testing ◽  
Nominal Performance ◽  
Piezoelectric Actuators And Sensors

An H∞-Based optimal vibration isolation system using patch-type piezoelectric actuators and sensors, suitable for application on high-precision manufacturing equipment that is being affected by external disturbances, has been designed. Reductions of the force transmitted through the structure range from approximately 5 to 30 dB in the frequency band of interest. Robust stability, nominal performance and robust performance have all been verified using the structured singular value, μ, and simulation testing for the set of plants within a derived uncertainty set. In addition, the H∞ controller is compared to an LQG-optimal controller designed for the same structure. The LQG controller, while achieving nominal performance comparable to the H∞ controller and being of significantly lower order, was shown to be unstable via μ-analysis and simulation testing. Thus, the LQG design should not be applied to a machine where there is significant in-band model uncertainty. Use of light-weight patch-type piezoelectric actuators and sensors provides a low-cost, easily-installable way of applying this technique to manufacturing equipment requiring isolation from low-frequency disturbances.

scholarly journals Modelling and Composite Control of Single Flexible Manipulators with Piezoelectric Actuators

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
En Lu ◽  
Wei Li ◽  
Xuefeng Yang ◽  
Mengbao Fan ◽  
Yufei Liu
Keyword(s):  
Vibration Suppression ◽  
Control Method ◽  
Sliding Mode ◽  
Piezoelectric Actuators ◽  
Flexible Manipulator ◽  
Optimal Placement ◽  
Flexible Manipulators ◽  
Linear Quadratic ◽  
Fast Subsystem ◽  
Slow Subsystem

The piezoelectric actuators are used to investigate the active vibration control of flexible manipulators in this paper. Based on the assumed mode method, piezoelectric coupling model, and Hamilton’s principle, the dynamic equation of the single flexible manipulator (SFM) with surface bonded actuators is established. Then, a singular perturbation model consisted of a slow subsystem and a fast subsystem is formulated and used for designing the composite controller. The slow subsystem controller is designed by fuzzy sliding mode control method, and the linear quadratic regulator (LQR) optimal control method is used to design fast subsystem controller. Furthermore, the changing trends of natural frequencies along with the changes in the position of piezoelectric actuators are obtained through the ANSYS Workbench software, by which the optimal placement of actuators is determined. Finally, numerical simulations and experiments are presented. The results demonstrate that the method of optimal placement is feasible based on the maximal natural frequency, and the composite controller presented in this paper can not only realize the trajectory tracking of the SFM and has a good result on the vibration suppression.

scholarly journals Simultaneous Structural Health Monitoring and Vibration Control of Adaptive Structures Using Smart Materials

2002 ◽  
Vol 9 (6) ◽  
pp. 329-339 ◽  
Author(s):  
Myung-Hyun Kim
Keyword(s):  
Vibration Control ◽  
Monitoring System ◽  
Health Monitoring ◽  
Smart Materials ◽  
Vibration Suppression ◽  
Sliding Mode ◽  
Structural Vibration ◽  
Control Technique ◽  
Experimental Investigations ◽  
Health Monitoring System

The integration of actuators and sensors using smart materials enabled various applications including health monitoring and structural vibration control. In this study, a robust control technique is designed and implemented in order to reduce vibration of an active structure. Special attention is given to eliminating the possibility of interaction between the health monitoring system and the control system. Exploiting the disturbance decoupling characteristic of the sliding mode observer, it is demonstrated that the proposed observer can eliminate the possible high frequency excitation from the health monitoring system. At the same time, a damage identification scheme, which tracks the changes of mechanical impedance due to the presence of damage, has been applied to assess the health condition of structures. The main objective of this paper is to examine the potential of combining the two emerging techniques together. Using the collocated piezoelectric sensors/actuators for vibration suppression as well as for health monitoring, this technique enabled to reduce the number of system components, while enhancing the performance of structures. As an initial study, both simulation and experimental investigations were performed for an active beam structure. The results show that this integrated technique can provide substantial vibration reductions, while detecting damage on the structure at the same time.

MIMO-FEA for Design and Active Vibration Suppression of an Adaptive Circular Composite Plate

Aerospace ◽  
2006 ◽  
Author(s):  
Mehrdad N. Ghasemi-Nejhad ◽  
Randy Sakagawa
Keyword(s):  
Finite Element ◽  
Composite Plate ◽  
Vibration Suppression ◽  
Complex Geometry ◽  
Fiber Composite ◽  
External Disturbance ◽  
Control Voltage ◽  
Space Applications ◽  
Active Vibration Suppression ◽  
Active Vibration

Adaptive structures combine sensors, actuators, and control systems for intelligent responses to their environment and promise a novel approach to satisfying the stringent performance requirements of future aerospace and space applications. This study focuses on a multi-input-multi-output finite element analysis for the design and active vibration suppression of an adaptive circular composite plate used here as the top device-plate for an intelligent composite platform that is designed for thrust vector control of a satellite thruster. The adaptive circular composite plate has three pairs of back-to-back embedded piezoelectric active fiber composite actuator patches. A finite element harmonic analysis is employed to develop a vibration suppression scheme, which is then used to study the vibration suppression of the circular composite plate using the piezoelectric patches embedded in the plate. In this approach, the responses of the structure to an arbitrary external force as well as an arbitrary internal piezoelectric control voltage are first determined, individually. Using the linearity of the system, the responses are then assembled in a system of equation as a coupled system and then solved simultaneously to determine the control voltages and their respective phases for the system actuators for a given external disturbance. This approach is an effective technique for the design of smart structures with complex geometry and multi-input-multi-output sensor and actuator systems to study their active vibration suppression capabilities and effectiveness. The design and active vibration suppression of the adaptive circular composite plate are explained and discussed.

Characterization, Modeling and Vibration Control of a Flexible Rubber Beam With Embedded Piezoelectric Actuators and Sensors

2003 ◽  
Author(s):  
Matthew L. Grier ◽  
Nader Jalili
Keyword(s):  
Vibration Control ◽  
Dynamic Behavior ◽  
Vibration Suppression ◽  
Experimental Testing ◽  
Piezoelectric Actuators ◽  
Elastic Stiffness ◽  
Similar Information ◽  
Series Resistor ◽  
Shunt Circuit ◽  
Piezoelectric Actuators And Sensors

A cantilever rubber beam with laminated piezoelectric actuators and sensors is initially tested to determine the properties governing the dynamic behavior of the beam. Various techniques are employed to estimate beam properties such as elastic stiffness, damping coefficient and natural frequencies, as well as piezoelectric actuator capabilities for vibration control purposes. A simplified Euler-Bernoulli model is proposed, which is validated using the properties previously discovered. A passive electric shunt circuit is then proposed for the beam vibration suppression, when subjected to external excitation forces. Simulation of a series resistor-inductor shunt circuit is used to demonstrate the capability of altering the beam’s dynamic behavior. Various methods for tuning the shunt circuit are explored in an effort to achieve optimal vibration suppression characteristics. Furthermore, experimental testing is conducted for validation of simulation results, which also yields similar information about passive shunting techniques for vibration damping.

4D printing technology, modern era: A short review

2020 ◽  
pp. 92-111
Author(s):  
Khodadad Mostakim ◽  
Nahid Imtiaz Masuk ◽  
Md. Rakib Hasan ◽  
Md. Shafikul Islam
Keyword(s):  
Smart Materials ◽  
Computer Aided Design ◽  
Short Review ◽  
Stimuli Responsive ◽  
4D Printing ◽  
Space Applications ◽  
Printing Technology ◽  
Practical Applications ◽  
Biomedical Technologies ◽  
Novel Material

The advancement in 3D printing has led to the rapid growth of 4D printing technology. Adding time, as the fourth dimension, this technology ushered the potential of a massive evolution in fields of biomedical technologies, space applications, deployable structures, manufacturing industries, and so forth. This technology performs ingenious design, using smart materials to create advanced forms of the 3-D printed specimen. Improvements in Computer-aided design, additive manufacturing process, and material science engineering have ultimately favored the growth of 4-D printing innovation and revealed an effective method to gather complex 3-D structures. Contrast to all these developments, novel material is still a challenging sector. However, this short review illustrates the basic of 4D printing, summarizes the stimuli responsive materials properties, which have prominent role in the field of 4D technology. In addition, the practical applications are depicted and the potential prospect of this technology is put forward.

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