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Flight Test Identification and Simulation of a UH-60A Helicopter and Slung Load

Flight Test Identification and Simulation of a UH-60A Helicopter and Slung Load
Author:
Publisher:
Total Pages: 98
Release: 2001
Genre:
ISBN:

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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.


Manuals Combined: UH-60 BLACK HAWK Pilot Flight Training, Engine, Electrical, Fuel System, Instrument & Crew Functions Visual Training Materials

Manuals Combined: UH-60 BLACK HAWK Pilot Flight Training, Engine, Electrical, Fuel System, Instrument & Crew Functions Visual Training Materials
Author:
Publisher: Jeffrey Frank Jones
Total Pages: 962
Release:
Genre:
ISBN:

Download Manuals Combined: UH-60 BLACK HAWK Pilot Flight Training, Engine, Electrical, Fuel System, Instrument & Crew Functions Visual Training Materials Book in PDF, ePub and Kindle

Over 900 pages ... Just a sample of the contents: LANDING GEAR TERMINAL LEARNING OBJECTIVE ACTION: Determine the major components and operational characteristics of the UH-60 landing gear system. CONDITIONS: Given multiple choices, visual representations of the UH-60 landing gear system components, and applicable references. STANDARDS : Select from multiple choices, the major components and operating characteristics of the UH-60 landing gear system. SAFETY REQUIREMENTS- Use care when operating training aids and/or devices. RISK ASSESSMENT- Low. ENVIRONMENTAL CONSIDERATIONS- None. EVALUATION: This block of instruction will be tested on the UH-60 aviation subjects written examination I (011-1374). A minimum score of 70% is required for passing. LEARNING STEP / ACTIVITY 1 Identify the primary components and operational characteristics of the UH-60 main landing gear system. Crash Worthiness UH-60 Main Landing Gear System Description: conventional, non-retractable, reverse tricycle arrangement. Components: Drag beam. Axle assembly. Main shock strut. Main wheel assembly. Wheel brake. Drag Beam Drag Beam Switches Drag Beam Strut at Rest Strut Under High Impact Load Strut Airborne Kneeling Valves Main Wheel Tire Details Master Cylinders Slave Cylinders/Parking Brake Valve Parking Brake Schematic Brake Wear Check Check On Learning Question: The lower stage of the main landing gear struts is designed to absorb landing loads up to ____ feet per second. Answer: 10 LEARNING STEP / ACTIVITY 2 Identify the primary components and operational characteristics of the UH-60 tail landing gear system. UH-60 Tail Landing Gear System Tail landing gear. Operation. Tail wheel assembly. Swivels 360 degrees. Upper end of strut. Yoke of tail gear. Fork assembly. Split aluminum rim. Tail wheel lock system. Tail Landing Gear Assembly Tail Strut Tail Yoke and Fork Tailwheel Lock System Tail Wheel Lock Check On Learning Question: Power to operate the tail wheel lock system is provided through the ____ bus. Answer: DC essential. SUMMARY Identified the primary components and operational characteristics of the UH-60 main landing gear system. Identified the primary components and operational characteristics of the UH-60 tail landing gear system. BREAK TIME! POWERTRAIN AND ROTOR SYSTEM TERMINAL LEARNING OBJECTIVE ACTION: Determine the major components and operational characteristics of the UH-60 powertrain system. CONDITIONS: Given multiple choices, visual representations of the UH-60 powertrain system components, and applicable references. STANDARDS : Select from multiple choices, the major components and operating characteristics of the UH-60 powertrain system. SAFETY REQUIREMENTS- Use care when operating training aids and/or devices. RISK ASSESSMENT- Low. ENVIRONMENTAL CONSIDERATIONS- None. EVALUATION: This block of instruction will be tested on the UH-60 aviation subjects written examination I (011-1374). A minimum score of 70% is required for passing. ENABLING LEARNING OBJECTIVE A ACTION: Identify the operational characteristics and modules of the UH-60 main transmission system. CONDITIONS: Given multiple choices, visual representations of the UH-60 main transmission system, and applicable references. STANDARDS: Select from multiple choices, the characteristics of the UH-60 main transmission system. Main Transmission Location Main Transmission Components Input and Accessory Modules Freewheeling Unit Accessory Module Main Module Details Check On Learning Question: The UH-60 main transmission system consists of how many modules? Answer: 5 (five). ENABLING LEARNING OBJECTIVE B ACTION: Identify the characteristics of the UH-60 main transmission lubrication system components. CONDITIONS: Given multiple choices, visual representations of the UH-60 transmission lubrication system, and