Download or read book Electromechanical Actuation Feasibility Study written by and published by . This book was released on 1976 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: An alternate to hydraulic actuation of primary flight control surfaces is desirable. Electromechanical actuation of primary flight controls is feasible and practical using the most recent advances in the state-of-the-art in magnetic materials for high-performance servomotors, high-current-capacity transistor switches for motor power control, and digital microprocessors for servo and redundancy management logic. Electromechanical actuation is consistent with current, proven, fly-by-wire technology and with the developing power-by- wire techniques. The control surface performance requirements and methods of analysis are presented for direct drive electromechanical power servos. Trade studies were conducted to evaluate the aircraft power source and distribution options; actuator motor and controller options; and geared rotary hinge actuator configuration options. A weight comparison is given between the hydraulic actuation system for the F-100 and the electromechanical system studied. Reliability assessments and redundancy management considerations also are included. A preliminary design of the electromechanical actuation system and test plan are presented. These data were developed using a selected baseline problem statement which was derived from existing hydraulic actuator specifications.
Download or read book Feasibility Study of Mechanical Clamping Actuator written by Tzyy-Wei Yieh and published by . This book was released on 1982 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1977 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Force Fight Study in a Dual Electromechanical Actuator Configuration written by Daniel G. Wroble and published by . This book was released on 2017 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromechanical actuators (EMAs) are seen as the future actuation technology for next-generation, energy-optimized aircraft. Implementation into primary flight control entails many challenges and requires much research, development, and experience to prove the technology's robustness and maturity. Operation of multiple actuators on a control surface introduces a phenomenon known as force fight, where instead of equally sharing load they behave unequally or oppose each other. Force fight is well studied for hydraulic actuation systems, but limited research has been done on EMAs. The purpose of this thesis is to study force fight experimentally between two X-38 EMAs in a passive spring loaded dual EMA test rig. Static and dynamic analytical models of the test setup were created to assist the force fight study. The command to both EMAs was a 1-Hz, 5-degree-amplitude sine wave of ten cycles. Known force fight conditions of position lag, gain, and offset errors were introduced to each EMA in turn and the impacts of each condition were examined in terms of force difference and energy consumption. Torque, rotation, voltage, current, and power were measured from the test stand along with EMA controller position and current monitors for data analysis. Energy demand of the EMAs was calculated from the integral of the mechanical and electrical power. The force difference impact also was analyzed utilizing the maximum and minimum force difference as recorded on the torque cells. It was shown that all three cases, lag, gain, and offset, resulted in significant force fight between the two EMAs expressed as force difference. The magnitude of force fight was a linear function of the magnitude of the errors. In addition, both the gain and offset errors caused significant increase in total electrical energy demand, the larger the gain or offset, the higher the electrical energy demand, while the lag errors showed slight electrical energy increase. It also was shown that mechanical energy difference between the two EMAs did not increase noticeably with the increase of the errors for the gain and offset cases, while the lag test showed a significant amount of mechanical energy difference between the two EMAs. Lastly, the model prediction of the maximum and minimum force fight was shown in good agreement with the experimental test results and, therefore, it is believed that the models could serve as a tool to analyze force fight scenarios that are outside the capability of the test rig.
Download or read book STAR written by and published by . This book was released on 1973 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis and Redesign of an Electromechanical Actuator by Using Finite Elements written by Hui Chen and published by . This book was released on 1993 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feasibility of Integrating Multiple Types of Electroactive Polymers to Develop a Biomimetic Inspired Muscle Actuator written by William E. Spath and published by . This book was released on 2011 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The focus of this project is to see if it is possible to integrate multiple EAP materials in an electro- mechanical system to produce a closer representation of a biological muscle with smooth varying motion. In this preliminary study, two common types of EAPs, ionic and dielectric, were investigated to determine their mechanical and electrical properties in order to assess their potential to be combined into a working artificial electromechanical muscle prototype at a later time. A conceptual design for an artificial electromechanical muscle was created with biomimetic relationships between EAP materials and the human bicep muscle. With the assistance of the Rochester General Hospital, a human arm model, isolating the bicep muscle, was created to calculate mechanical characteristics of the bicep brachii. From the human arm model, bicep muscle characteristics were compared to those of the dielectric EAP because of the ability for the EAP to output relatively high force and strain during actuation. It was found that the current state of the art of EAPs is a long way from making this a reality due to their limiting force output and voltage requirements. The feasibility of developing an artificial electromechanical muscle with EAP actuators is not possible with current technology."--Abstract.
Download or read book Issues in Energy Conversion Transmission and Systems 2012 Edition written by and published by ScholarlyEditions. This book was released on 2013-01-10 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Energy Conversion, Transmission, and Systems: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Power Systems. The editors have built Issues in Energy Conversion, Transmission, and Systems: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Power Systems in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Energy Conversion, Transmission, and Systems: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book NASA SP 7500 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1982 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrating Electromechanical Actuator Hardware with Receptance Coupling Substructure Analysis for Chatter Prediction on High Speed Machining Centers written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Machine tool chatter imposes limitations on the productivity and quality of modern high speed machining (HSM) operations. It has been shown that chatter prediction and avoidance strategies can lead to increased machining productivity if certain modal characteristics of the machine are known. The objectives of this research are twofold. The first aim is to design and demonstrate a non-contacting electromechanical actuator (EMA) to easily and accurately identify these characteristics. Design specifications for this actuator reflect a wide range of machine tools and operating conditions. A simulation-based design strategy is employed, based on traditional electromechanical analysis, finite element analysis (FEA), and computer simulations to ensure performance meets the design specifications. A prototype EMA system is built to validate the analytical results and demonstrate its capabilities as part of an automated chatter prediction and avoidance system. The EMA is shown to generate the required modal characteristics, namely frequency response functions (FRFs) quickly, accurately, and with fewer technical skill requirements than other vibration testing methods. Experimental machining tests demonstrate that the EMA can be an effective component of an integrated chatter prediction and avoidance system. The second goal is to investigate the feasibility of extending receptance coupling substructure analysis (RCSA) theory to tool-point FRF prediction. Inverse and forward RCSA algorithms are developed using Matlab software. FRF prediction is first evaluated in simulation and later tested with experimental results from the EMA actuator. RCSA prediction in simulation is correct; experimental results are highly susceptible to input error.
Download or read book Analysis of Electro mechanical Actuator Systems in More Electric Aircraft Applications written by Mohsen Torabzadeh-Tari and published by . This book was released on 2005 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1986 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dielectric Elastomers as Electromechanical Transducers written by Federico Carpi and published by Elsevier. This book was released on 2011-09-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dielectric Elastomers as Electromechanical Transducers provides a comprehensive and updated insight into dielectric elastomers; one of the most promising classes of polymer-based smart materials and technologies. This technology can be used in a very broad range of applications, from robotics and automation to the biomedical field. The need for improved transducer performance has resulted in considerable efforts towards the development of devices relying on materials with intrinsic transduction properties. These materials, often termed as “smart or “intelligent , include improved piezoelectrics and magnetostrictive or shape-memory materials. Emerging electromechanical transduction technologies, based on so-called ElectroActive Polymers (EAP), have gained considerable attention. EAP offer the potential for performance exceeding other smart materials, while retaining the cost and versatility inherent to polymer materials. Within the EAP family, “dielectric elastomers , are of particular interest as they show good overall performance, simplicity of structure and robustness. Dielectric elastomer transducers are rapidly emerging as high-performance “pseudo-muscular actuators, useful for different kinds of tasks. Further, in addition to actuation, dielectric elastomers have also been shown to offer unique possibilities for improved generator and sensing devices. Dielectric elastomer transduction is enabling an enormous range of new applications that were precluded to any other EAP or smart-material technology until recently. This book provides a comprehensive and updated insight into dielectric elastomer transduction, covering all its fundamental aspects. The book deals with transduction principles, basic materials properties, design of efficient device architectures, material and device modelling, along with applications. Concise and comprehensive treatment for practitioners and academics Guides the reader through the latest developments in electroactive-polymer-based technology Designed for ease of use with sections on fundamentals, materials, devices, models and applications
Download or read book Proceedings of the IEEE 1981 National Aerospace and Electronics Conference NAECON 1981 written by and published by . This book was released on 1981 with total page 1508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Management written by and published by . This book was released on 1983 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Vehicle Health Management written by Ian K Jennions and published by SAE International. This book was released on 2013-09-25 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated Vehicle Health Management (IVHM) is a relatively new subject, with its roots back in the space sector of the early 1990s. Although many of the papers written around that time did not refer to it as IVHM, the fundamental principles of considering an integrated end-to-end system to monitor the overall health of the asset were clearly visible. As the subject of Integrated Vehicle Health Management (IVHM) and its associated technologies have grown up, businesses are making the transformation from selling a product to selling a service. This can be viewed as a positive disruption, as a relatively small technology breakthrough is being brought to market for a large business benefit. The sequence “sense—acquire—transfer—analyze—act “ feeds the information (processed data) on the asset’s health into the Operations or Management control center. Here, decisions can be made on maintenance actions with knowledge of the supply chain status, MRO loading, etc., provided by Maintenance and Logistics systems. Undoubtedly, a much more efficient and economical modus operandi. This book brings together a collection of twenty –two SAE International Technical papers on this very theme, organized according to specific areas of interest: • Engines • Airframes • Electrical Power Systems • Supporting Systems • Architecture They were selected by Dr. Ian K. Jennions, Director of IVHM Center at Cranfield University, in the UK. Dr. Jennions was also the editor of three other books on Integrated Vehicle Health Management, published by SAE International: • IVHM: Perspectives on an Emerging Field • IVHM: Business Case Theory and Practice • IVHM: The Technology
Download or read book Technology for Large Space Systems written by and published by . This book was released on 1989 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
