Download or read book Development of Active Flutter Suppression Wind Tunnel Testing Technology written by Francis D. Sevart and published by . This book was released on 1975 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: A research study was conducted to develop active flutter suppression wind tunnel testing technology. A one-thirtieth scale B-52 aeroelastic model was modified to represent the Control Configured Vehicles (CCV) B-52 flight test airplane with an active flutter mode control system (FMCS). The system was mechanized on the model using electromechanical actuation systems for the scaled CCV airplane outboard aileron and flaperon outboard segment control surfaces. The model was tested in the NASA-Langley Transonic Dynamics Tunnel to evaluate the unaugmented model flutter characteristics and performance of the flutter mode control system. Test results were compared with model analytical results and CCV program flight test results for equivalent weight and altitude conditions. The model flutter speed, in airplane scale, is 8.1 percent higher than the airplane flutter speed, less than 1.0 percent higher than the predicted difference. Flutter mode damping with the FMCS engaged is higher on the model than on the airplane, but the damping trends with increasing airspeed are similar. The good agreement attained between model and airplane test results demonstrates that dynamically scaled models can be used to verify analytical methods used to design active flutter mode control systems. (Author).
Download or read book Application of Two Design Methods for Active Flutter Suppression and Wind tunnel Test Results written by Jerry R. Newsom and published by . This book was released on 1980 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Two Design Methods for Active Flutter Suppression and Wind tunnel Test Results written by Jerry R. Newsom and published by . This book was released on 1980 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Two Design Methodas for Active Flutter Suppression and Wind tunnel Test Results written by Jerry R. Newsom and published by . This book was released on 1980 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The design analysis and testing of a wind tunnel model with active aerodynamic controls for flutter suppression written by Randall Murray Bolding and published by . This book was released on 1978 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by and published by . This book was released on 1980 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Digital flutter suppression system Investigations for the Active Flexible Wing Wind tunnel Model written by and published by . This book was released on 1990 with total page 11 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 1992-11 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Department of Housing and Urban Development independent Agencies Appropriations for 1981 written by United States. Congress. House. Committee on Appropriations. Subcommittee on HUD-Independent Agencies and published by . This book was released on 1980 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On Subscale Flight Testing written by Alejandro Sobron and published by Linköping University Electronic Press. This book was released on 2018-11-05 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Downscaled physical models, also referred to as subscale models, have played an essential role in the investigation of the complex physics of flight until the recent disruption of numerical simulation. Despite the fact that improvements in computational methods are slowly pushing experimental techniques towards a secondary role as verification or calibration tools, real-world testing of physical prototypes still provides an unmatched confidence. Physical models are very effective at revealing issues that are sometimes not correctly identified in the virtual domain, and hence can be a valuable complement to other design tools. But traditional wind-tunnel testing cannot always meet all of the requirements of modern aeronautical research and development. It is nowadays too expensive to use these scarce facilities to explore different design iterations during the initial stages of aircraft development, or to experiment with new and immature technologies. Testing of free-flight subscale models, referred to as Subscale Flight Testing (SFT), could offer an affordable and low-risk alternative for complementing conventional techniques with both qualitative and quantitative information. The miniaturisation of mechatronic systems, the advances in rapid-prototyping techniques and power storage, as well as new manufacturing methods, currently enable the development of sophisticated test objects at scales that were impractical some decades ago. Moreover, the recent boom in the commercial drone industry has driven a quick development of specialised electronics and sensors, which offer nowadays surprising capabilities at competitive prices. These recent technological disruptions have significantly altered the cost-benefit function of SFT and it is necessary to re-evaluate its potential in the contemporary aircraft development context. This thesis aims to increase the comprehension and knowledge of the SFT method in order to define a practical framework for its use in aircraft design; focusing on low-cost, short-time solutions that don’t require more than a small organization and few resources. This objective is approached from a theoretical point of view by means of an analysis of the physical and practical limitations of the scaling laws; and from an empirical point of view by means of field experiments aimed at identifying practical needs for equipment, methods, and tools. A low-cost data acquisition system is developed and tested; a novel method for semi-automated flight testing in small airspaces is proposed; a set of tools for analysis and visualisation of flight data is presented; and it is also demonstrated that it is possible to explore and demonstrate new technology using SFT with a very limited amount of economic and human resources. All these, together with a theoretical review and contextualisation, contribute to increasing the comprehension and knowledge of the SFT method in general, and its potential applications in aircraft conceptual design in particular.
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1984 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Requirements and Feasibility Study of Flight Demonstration of Active Controls Technology ACT on the NASA 515 Airplane written by and published by . This book was released on 1975 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP written by and published by . This book was released on 1992 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by International Council of the Aeronautical Sciences and published by . This book was released on 1984 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Congress of the International Council of the Aeronautical Sciences written by International Council of the Aeronautical Sciences. Congress and published by . This book was released on 1988 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1995 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
