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Author: Ranjan Ganguli
Publisher: Springer
ISBN: 3319247689
Category : Technology & Engineering
Languages : en
Pages : 264
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Book Description
Exploiting the properties of piezoelectric materials to minimize vibration in rotor-blade actuators, this book demonstrates the potential of smart helicopter rotors to achieve the smoothness of ride associated with jet-engined, fixed-wing aircraft. Vibration control is effected using the concepts of trailing-edge flaps and active-twist. The authors’ optimization-based approach shows the advantage of multiple trailing-edge flaps and algorithms for full-authority control of dual trailing-edge-flap actuators are presented. Hysteresis nonlinearity in piezoelectric stack actuators is highlighted and compensated by use of another algorithm. The idea of response surfaces provides for optimal placement of trailing-edge flaps. The concept of active twist involves the employment of piezoelectrically induced shear actuation in rotating beams. Shear is then demonstrated for a thin-walled aerofoil-section rotor blade under feedback-control vibration minimization. Active twist is shown to be significant in reducing vibration caused by dynamic stall. The exposition of ideas, materials and algorithms in this monograph is supported by extensive reporting of results from numerical simulations of smart helicopter rotors. This monograph will be a valuable source of reference for researchers and engineers with backgrounds in aerospace, mechanical and electrical engineering interested in smart materials and vibration control. Advances in Industrial Control aims to report and encourage the transfer of technology in control engineering. The rapid development of control technology has an impact on all areas of the control discipline. The series offers an opportunity for researchers to present an extended exposition of new work in all aspects of industrial control.
Author: Ranjan Ganguli
Publisher: Springer
ISBN: 3319247689
Category : Technology & Engineering
Languages : en
Pages : 264
Get Book Here
Book Description
Exploiting the properties of piezoelectric materials to minimize vibration in rotor-blade actuators, this book demonstrates the potential of smart helicopter rotors to achieve the smoothness of ride associated with jet-engined, fixed-wing aircraft. Vibration control is effected using the concepts of trailing-edge flaps and active-twist. The authors’ optimization-based approach shows the advantage of multiple trailing-edge flaps and algorithms for full-authority control of dual trailing-edge-flap actuators are presented. Hysteresis nonlinearity in piezoelectric stack actuators is highlighted and compensated by use of another algorithm. The idea of response surfaces provides for optimal placement of trailing-edge flaps. The concept of active twist involves the employment of piezoelectrically induced shear actuation in rotating beams. Shear is then demonstrated for a thin-walled aerofoil-section rotor blade under feedback-control vibration minimization. Active twist is shown to be significant in reducing vibration caused by dynamic stall. The exposition of ideas, materials and algorithms in this monograph is supported by extensive reporting of results from numerical simulations of smart helicopter rotors. This monograph will be a valuable source of reference for researchers and engineers with backgrounds in aerospace, mechanical and electrical engineering interested in smart materials and vibration control. Advances in Industrial Control aims to report and encourage the transfer of technology in control engineering. The rapid development of control technology has an impact on all areas of the control discipline. The series offers an opportunity for researchers to present an extended exposition of new work in all aspects of industrial control.
Author: Andreas Paul Friedrich Bernhard
Publisher:
ISBN:
Category : Blades
Languages : en
Pages : 1206
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Book Description
Author: Nikhil Koratkar
Publisher:
ISBN:
Category : Flaps (Airplanes)
Languages : en
Pages : 672
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Book Description
The status of a number of rotorcraft research tasks supported under the Army Research Office "Smart Structures URI" program is reported herein for the reporting period from 1 January 1992 to 31 December 1997. For each task, the task objectives, the approach taken, and the final status of the research, and pertinent abstracts of journal articles or conference papers published as result of the research conducted under the task. Copies of all journal papers and conference papers that were produced under this program were forwarded to the U.S. Army Research Office in 1998, at the completion of the program, and are available upon request. The tasks are varied and cover many aspects of smart helicopter rotor development at the University of Maryland, including: (1) Development of a smart rotor using trailing edge flaps, and a controllable twist rotor blade, (2) Active tuning of composite shaft using shape memory alloy wires, (3) Active/passive damping for helicopter rotor stability augmentation, (4) Rotor acoustics control and analysis, (5) Health monitoring and damage detection, and (6) Elements of smart structures.
Author: Inderjit Chopra
Publisher: Cambridge University Press
ISBN: 052186657X
Category : Science
Languages : en
Pages : 925
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Book Description
This book focuses on smart materials and structures, which are also referred to as intelligent, adaptive, active, sensory, and metamorphic. The ultimate goal is to develop biologically inspired multifunctional materials with the capability to adapt their structural characteristics, monitor their health condition, perform self-diagnosis and self-repair, morph their shape, and undergo significant controlled motion.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
One concept being considered for active noise and vibration control of helicopter rotors is a trailing edge flap design driven by a high-displacement piezoelectric actuator device. The proposed device requires an 800-V power supply and draws a current on the order of .3 A. Thus, depending on the duty cycle and efficiency of the mechanism, some portion of the 240 W of electrical input energy will be converted to heat. This study provides an initial estimate of the temperatures that may be encountered if no provisions are made for cooling the actuator. Also included are a discussion of the heat transfer calculation, assuming conduction and radiation as the dominant modes, and a description of HEAT 8, the computer code used.
Author: James Scheiman
Publisher:
ISBN:
Category : Rotors (Helicopters)
Languages : en
Pages : 704
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
The present work focuses on the design, construction and testing of a smart actuating system for the cyclic and collective control of helicopter blades for UAV applications. The actuating mechanism consists of a multilayered actuator made of PZT 5H layers bonded together on an aluminum substrate. The design of the actuator was performed using finite element techniques and introducing coupling mechanics in order to improve the simulation capabilities of the numerical tools. The construction and implementation of the smart actuation system are presented and finally static tests were performed (no blade rotation), mostly for the investigation of the cyclic pitch control. The actuation signal send to the piezoelectric actuator was in the frequency domain of 10-15 Hz, that covers the area of 700-750 rpm which is considered as the operational rotational velocity of the blade. The combination of velocity and radius of the rotor (1 m) impose severe loading to the actuator, however, the intelligent use of piezoelectric materials leads to functional structures that fulfill the design requirements.
Author: Yuji Matsuzaki
Publisher: CRC Press
ISBN: 9781587161032
Category : Technology & Engineering
Languages : en
Pages : 658
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Book Description
