Flight Testing And Real Time System Identification Analysis Of A Uh 60a Black Hawk Helicopter With An Instrumented External Sling Load
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Flight Test Identification And Simulation Of A Uh 60a Helicopter And Slung Load
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Author :
language : en
Publisher:
Release Date : 2001
Flight Test Identification And Simulation Of A Uh 60a Helicopter And Slung Load written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Helicopter slung-load operations are common in both military and civil contexts. Helicopters and loads are often qualified for these operations by means of flight tests, which can be expensive and time consuming. There is significant potential to reduce such costs both through revisions in flight-test methods and by using validated simulation models. To these ends, flight tests were conducted at Moffett Field to demonstrate the identification of key dynamic parameters during flight tests (aircraft stability margins and handling-qualities parameters, and load pendulum stability), and to accumulate a data base for simulation development and validation. The test aircraft was a UH-60A Black Hawk, and the primary test load was an instrumented 8- by 6- by 6-ft cargo container. Tests were focused on the lateral and longitudinal axes, which are the axes most affected by the load pendulum modes in the frequency range of interest for handling qualities; tests were conducted at airspeeds from hover to 80 knots. Using telemetered data, the dynamic parameters were evaluated in near real time after each test airspeed and before clearing the aircraft to the next test point. These computations were completed in under 1 min. A simulation model was implemented by integrating an advanced model of the UH-60A aerodynamics, dynamic equations for the two-body slung-load system, and load static aerodynamics obtained from wind-tunnel measurements. Comparisons with flight data for the helicopter alone and with a slung load showed good overall agreement for all parameters and test points; however, unmodeled secondary dynamic losses around 2 Hz were found in the helicopter model and they resulted in conservative stability margin estimates.
Flight Testing And Real Time System Identification Analysis Of A Uh 60a Black Hawk Helicopter With An Instrumented External Sling Load
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Author : Allen H. McCoy
language : en
Publisher:
Release Date : 1997-12
Flight Testing And Real Time System Identification Analysis Of A Uh 60a Black Hawk Helicopter With An Instrumented External Sling Load written by Allen H. McCoy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-12 with Science categories.
Historically, helicopter and load combinations have been qualified through flight testing, requiring considerable time and cost. With advancements in simulation and flight test techniques, there is potential to substantially reduce costs and increase the safety of helicopter sling load certification. Validated simulation tools make possible accurate prediction of operational flight characteristics before initial flight tests. Real time analysis of test data improves the safety and efficiency of the testing programs. To advance these concepts, the US Army and NASA, in cooperation with the Israeli Air Force and Technion, under a Memorandum of Agreement, seek to develop and validate a numerical model of the UH-60 with sling load and demonstrate a method of near real time flight test analysis. This thesis presents results from flight tests of a US Army Black Hawk helicopter with various external loads. Tests were conducted as the US first phase of this MOA task. The primary load was a container express box (CONEX), which contained a compact instrumentation package. The flights covered the airspeed range from hover to 70 knots. Primary maneuvers were pitch and roll frequency sweeps, steps, and doublets. Results of the test determined the effect of the suspended load on both the aircraft's handling qualities and it's control system's stability margins. Included were calculations of the stability characteristics of the load's pendular motion. Utilizing CIFER software, a method for near-real time system identification was also demonstrated during the flight test program.
Flight Time Identification Of A Uh 60a Helicopter And Slung Load
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Author :
language : en
Publisher:
Release Date : 1998
Flight Time Identification Of A Uh 60a Helicopter And Slung Load written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date : 1999-07
Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-07 with Government publications categories.
Identification Des Syst Mes Pour Le D Veloppement Int Gr Des A Ronefs Et Les Essais En Vol
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Author :
language : en
Publisher:
Release Date : 1999
Identification Des Syst Mes Pour Le D Veloppement Int Gr Des A Ronefs Et Les Essais En Vol written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Airplanes categories.
Journal Of The American Helicopter Society
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Author : American Helicopter Society
language : en
Publisher:
Release Date : 2001
Journal Of The American Helicopter Society written by American Helicopter Society and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Helicopters categories.
Flight Testing And Real Time System Identification Analysis Of A Uh 60a Black Hawk Helicopter With An Instrumented External Sling Load
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-06
Flight Testing And Real Time System Identification Analysis Of A Uh 60a Black Hawk Helicopter With An Instrumented External Sling Load written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-06 with categories.
Helicopter external air transportation plays an important role in today's world. For both military and civilian helicopters, external sling load operations offer an efficient and expedient method of handling heavy, oversized cargo. With the ability to reach areas otherwise inaccessible by ground transportation, helicopter external load operations are conducted in industries such as logging, construction, and fire fighting, as well as in support of military tactical transport missions. Historically, helicopter and load combinations have been qualified through flight testing, requiring considerable time and cost. With advancements in simulation and flight test techniques there is potential to substantially reduce costs and increase the safety of helicopter sling load certification. Validated simulation tools make possible accurate prediction of operational flight characteristics before initial flight tests. Real time analysis of test data improves the safety and efficiency of the testing programs. To advance these concepts, the U.S. Army and NASA, in cooperation with the Israeli Air Force and Technion, under a Memorandum of Agreement, seek to develop and validate a numerical model of the UH-60 with sling load and demonstrate a method of near real time flight test analysis. This thesis presents results from flight tests of a U.S. Army Black Hawk helicopter with various external loads. Tests were conducted as the U.S. first phase of this MOA task. The primary load was a container express box (CONEX) which contained a compact instrumentation package. The flights covered the airspeed range from hover to 70 knots. Primary maneuvers were pitch and roll frequency sweeps, steps, and doublets. Results of the test determined the effect of the suspended load on both the aircraft's handling qualities and its control system's stability margins. Included were calculations of the stability characteristics of the load's pendular motion. Utilizing CIFER(R) software, a method for near-...
The Praetorian Starship The Untold Story Of The Combat Talon
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Author :
language : en
Publisher: DIANE Publishing
Release Date : 2001
The Praetorian Starship The Untold Story Of The Combat Talon written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Jerry Thigpen's study on the history of the Combat Talon is the first effort to tell the story of this wonderfully capable machine. This weapons system has performed virtually every imaginable tactical event in the spectrum of conflict and by any measure is the most versatile C-130 derivative ever produced. First modified and sent to Southeast Asia (SEA) in 1966 to replace theater unconventional warfare (UW) assets that were limited in both lift capability and speed the Talon I quickly adapted to theater UW tasking including infiltration and resupply and psychological warfare operations into North Vietnam. After spending four years in SEA and maturing into a highly respected UW weapons system the Joint Chief of Staff (JCS) chose the Combat Talon to lead the night low-level raid on the North Vietnamese prison camp at Son Tay. Despite the outcome of the operation the Talon I cemented its reputation as the weapons system of choice for long-range clandestine operations. In the period following the Vietnam War United States Air Force (USAF) special operations gradually lost its political and financial support which was graphically demonstrated in the failed Desert One mission into Iran. Thanks to congressional supporters like Earl Hutto of Florida and Dan Daniel of Virginia funds for aircraft upgrades and military construction projects materialized to meet the ever-increasing threat to our nation. Under the leadership of such committed hard-driven officers as Brenci Uttaro Ferkes Meller and Thigpen the crew force became the most disciplined in our Air Force. It was capable of penetrating hostile airspace at night in a low-level mountainous environment covertly to execute any number of unconventional warfare missions.
Aircraft And Rotorcraft System Identification
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Author : Mark Brian Tischler
language : en
Publisher: AIAA Education
Release Date : 2012
Aircraft And Rotorcraft System Identification written by Mark Brian Tischler and has been published by AIAA Education this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Technology & Engineering categories.
Although many books have been written on the theory of system identification, few are available that provide a complete engineering treatment of system identification and how to successfully apply it to flight vehicles. This book presents proven methods, practical guidelines, and real-world flight-test results for a wide range of state-of-the-art flight vehicles, from small uncrewed aerial vehicles (UAVs) to large manned aircraft/rotorcraft.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.