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.
This book documents the state-of-the-art evaluation of the embryonic field of multifunctional materials and adaptive structures, more specifically in the area of active vibration suppression, shape control, noise attenuation, structural health monitoring, smart machines and micro-electro-mechanical systems with application in aircraft, aerospace, automobile, civil structures and consumer industry.
An innovative concept, smart structural systems have proven to be extremely effective in absorbing damaging energy and/or counteracting potentially devastating force, thus limiting structural collapse and subsequent injury. As this technology rapidly evolves, there is an ever-increasing need for an authoritative reference that will allow those in t
Written by a team of experts that has been working together for several years in the context of a research network involving international institutions, this book brings several applications related to smart material systems such as vibration and noise control, structural health monitoring, energy harvesting and shape memory alloys. Furthermore, this book also provides basic knowledge on the fundamentals of smart material systems and structures. Consequently, the present title serves as an important resource for advanced undergraduate and graduate students. In addition, it serves as a guide for engineers and scientists working with smart structures and materials both with an application and basic research perspective. Smart material systems and structures represent a new paradigm which is increasing the capabilities of engineering systems. Adaptability and versatility are some important aspects related to such systems. In brief, research on smart materials is characterized by synergistically combining different physical features, such as mechanical, electrical, chemical, and magnetic. As a result, smart material technologies have a huge potential to enhance the performance of engineering structures opening unlimited opportunities to innovation and economic benefits.
This report assesses the current status and maturity of smart structures technology. The report contains sections on smart materials, neural networks, health monitoring, and smart structures component technologies such as actuators, sensory elements, control methodologies and algorithms, controller architecture and implementation hardware, and signal conditioning and power amplification. A strategic research and-development plan is suggested for the Air Force. Eleven specific problems with Air Force aircraft structure and weapons systems are identified which have the potential for being alleviated or reduced by application Of Smart structures technologies.
Organized by the International Association for Structural Control(IASC), and sponsored by the European Association for the Controlof Structures (EACS), the recent world conference on structuralcontrol (3WCSC) brought together engineers, scientists, architects,builders and other practitioners interested in the general fieldsof active, hybrid and passive vibration control, health monitoringand damage detection, intelligent/smart materials and systems.Applications included buildings, bridges, space structures andcivil infrastructures under the action of dynamic environments(earthquake, wind, traffic...) and man-made loads. It provideda valuable forum for the discussion of the most pressing concernsin structural control and its related topics. The conference covered a wide range of topics including activeand semi-active control devices, passive control devices, controlalgorithms for linear and non-linear systems, modeling andidentification of structural systems, sensors, health monitoringand damage detection, benchmark test of building and bridges,innovative materials for structural control, applications toaerospace structures, applications to bridges, applications tocritical structures, external dynamic force characteristics andcontrollability issues, implications of severe ground motions, windforces, codes for structural control, and so forth. Suchcomprehensive treatment of the most innovative developments instructural control will make these volumes an informative referencefor all researchers and engineers interested in this area. Proceedings of the US - Europe Workshop On Sensors andSmart Structures Technology Como and Somma Lombardo, Italy In the last few years, significant progress has been made in thearea of sensing technology and structural healthmonitoring/condition assessment in the US and Europe. Innovativeconcepts involving new hardware, algorithms, and software have beenproposed. There have also been several full-scale trialimplementations of densely sensor-instrumented infrastructures andhealth monitoring systems, as well as case studies on bridges inEurope and in the US. Much can be learnt through US/European collaboration in the areaof experimental verification on small, medium, large and full-scaleprojects. Moreover, a common framework for expanded future jointresearch can be developed on the increased understanding achievedthrough mutual learning. This workshop consisted of seminar sessions on several themeswhich included innovative sensing hardware, advances in wirelesstechnology, and damage detection/characterization and conditionassessment methodologies. In addition, there were several workshopsessions devoted to summarizing the status of the sensors and smartstructures technologies in these topics, identifying the compellingresearch issues, and formulating an action plan withrecommendations for development and implementation through possiblecollaborative research projects and sharing of scientific data.
Smart (intelligent) structures have been the focus of a great deal of recent research interest. In this book, leading researchers report the state of the art and discuss new ideas, results and trends in 43 contributions, covering fundamental research issues, the role of intelligent monitoring in structural identification and damage assessment, the potential of automatic control systems in achieving a desired structural behaviour, and a number of practical issues in the analysis and design of smart structures in mechanical and civil engineering applications. Audience: A multidisciplinary reference for materials scientists and engineers in such areas as mechanical, civil, aeronautical, electrical, control, and computer engineering.
