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Wednesday, May 13, 2020 | History

3 edition of Ground and flight test results of a total main rotor isolation system found in the catalog.

Ground and flight test results of a total main rotor isolation system

Ground and flight test results of a total main rotor isolation system

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  • 11 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Office, For sale by the National Technical Information Service] in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Helicopters -- Testing.,
  • Rotors (Helicopters) -- Testing.

  • Edition Notes

    StatementDennis R. Halwes.
    SeriesNASA contractor report -- 4082., NASA contractor report -- NASA CR-4082.
    ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Office.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15279543M

    The first active rotor approach, tested in the s (Warnicke and Drees) on a 2-bladed UH-1 relied upon oscillating the existing main rotor blades through the rotor control system; a method known as Higher Harmonic Control (HHC). Typically, helicopters have three hydraulic servos that move the swashplate which, in turn, steers the main rotor Author: William A. Welsh. The Explicit RSF control system implemented fuselage feedback and measured (explicit) rotor-state feedback via a laser measurement system installed on the aircraft. The sensor characteristics, frequency response validation, handling qualities ratings, and MTE tracking performance for hover/low-speed are discussed in this : Christina Ivler, M. Hossein Mansur, Zachariah Morford, Kevin Kalinowski, Marit Knapp.

    Usually caused by imbalanced rotor system, which causes vibrations. The forces of the vibration cannot be absorbed by the landing strut or tire and a counter-wave is sent back through the helicopter, usually resulting in further imbalance of the rotor. Upon successful completion of this course of instruction, the student will have an understanding of flight test procedures, techniques, and data analysis associated with helicopter static stability characteristics and flight test procedures.

    during the flight test (maximum roll / pitch value, minimum altitude, etc) so the safety of the whole flight test is guaranteed. This autopilot for automated flight test will be tested using hardware in the loop simulator for hover flight condition. 1 Introduction With the ability to take off and land vertically and hover. Vibration isolation is a commonly used technique for reducing or suppressing unwanted vibrations in structures and machines. With this technique, the device or system of interest is isolated from the source of vibration through insertion of a resilient member or isolator.


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Ground and flight test results of a total main rotor isolation system Download PDF EPUB FB2

Get this from a library. Ground and flight test results of a total main rotor isolation system. [Dennis R Halwes; United States. National Aeronautics and Space Administration.

Scientific and Technical Information Office.]. The Rotor Systems Research Aircraft was a unique vehicle created to test advanced helicopter rotors in flight. The idea was to provide a capability to more fully explore the in-flight performance of new main rotor designs prior to committing them.

production rotor set previously used in a flight-test program at Boeing Helicopter. The general characteristics of the main rotor are summarized in Table 1.

Additional details about the rotor system are presented in Ref. The BO hingeless rotor was installed on the recently modified Rotor Test Apparatus (RTA).

TheFile Size: 2MB. This paper presents the control system design process of a novel tilt-rotor unmanned aerial vehicle (TRUAV). First, a new configuration scheme with the tilting rotors is designed. The _____ provides pneumatic power for main engine start and cabin heating, it also provides electrical power for ground operations and in-flight emergency electrical power.

APU The main transmission has a built-in __________ forward tilt. Flight testing the fixed-wing configuration of the rotor systems research aircraft (RSRA) [microform] / Ground and flight test results of a total main rotor isolation system [microform] / Dennis R. Halwes; NASTRAN modeling of flight test components for UHA airloads program test configuration [microform].

Ground and flight test results of a total main rotor isolation system [microform] / Dennis R. Halwes Mathematical modelling of helicopter slung-load systems / R. Stuckey Explore. ight test data. Results show that inclusion of only the main rotor noise will produce results that severely underpredict integrated metrics of interest.

Inclusion of the tail rotor frequency content is essential for accurately predicting these integrated noise metrics. Contents 1 Introduction 3 2 Prediction Method 5. The full results of troubleshooting process related to the flight control system of a tilt-rotor type UAV in the flight tests are described.

Flight tests were conducted in helicopter, conversion. necessary to sever an unstable rotor system in flight. While it had always been planned to flight test the fixed wing configuration, the selection of the RSRA as the flight test bed for the X-wing rotor accelerated this schedule.

This paper discusses the build-up to, and the flight test of, the RSRA fixed wing configura- tion. It is written File Size: KB. The present paper investigates the UHA rotor structural loads from the flight and wind tunnel tests to better under-stand the differences in chord bending moments observed in Ref.

15 and to better predict these moments. Coupled CFD and CA analysis predictions of rotor structural loads as well as airloads results are compared with the test data.

Helicopter Technology Company, LLC NOTICE No.: Service DATE: 12 October Notice PAGE: 1 of 4 MAIN ROTOR BLADE ABRASION TAPE SUMMARY: HTC has observed Water Intrusion into the Bond-Line of the Inboard Areas of the Abrasion Strip on fielded Main Rotor Blades.

This Water Intrusion can cause a Failure of the Abrasion Strip Bond. A File Size: KB. TM &P 00 TASK 5 - POST FLIGHT BALANCE MAIN ROTOR ON THE GROUND PROCEDURE 1: PREPARATION Perform task 4, Main Rotor Roll/Vertical IN-FLIGHT Tuning. PROCEDURE 2: PERFORM GROUND BALANCE MEASUREMENT a.

Use cursor keys to highlight Aircraft Type, then press DO. Use cursor keys to highlighted UH. The main rotor must be tilted to the ___ in order to counter the effect of the tail rotor, thus the helicopter will tend to land on the ___ skid first.

Left Left (Right skid will lift off first on take off). An important property is the total mass of the rotorblades since this is a measure of the amount of kinethic energy stored in the system.

A significant amount thereof makes the rotorsystem less vulnerable to low rotor RPM because it takes longer to slow the blades down. compliance with the flight requirements of this Subpart. CS Main rotor speed and pitch limits (a) Main rotor speed limits. A range of main rotor speeds must be established that: (1) With power on, provides adequate margin to accommodate the variations in rotor speed occurring in any appropriate manoeuvre,File Size: 2MB.

The results from a wind-tunnel test of a small-scale free-tip rotor are analyzed. The free-tip rotor has blade tips that are free to weathervane into the tip's relative wind, thus producing a more uniform lift around the azimuth.

The free tip extended over the outer 10% of the rotor blade and included a simple, passive controller mechanism. An Introduction to Aircraft Performance. Mario Asselin ; this book also examines specialized subjects such as the Ground Proximity Warning System and ice formation on aircraft on the ground or in flight.

Asselin's veteran analysis and clear explanation of aircraft performance issues have already found their way into many university. To overcome many of the problems associated with conventional articulated rotor systems, new rotor systems are being contemplated.

In this paper, the state-of-art technology of advanced rotor systems is assessed. Advanced rotors include hingeless, bearingless, composite, circulation control, tilt and advanced geometry rotors.

The paper reviews mathematical Cited by: 1. Smart UAV, its verification via the flight test, and the trouble-shooting data. They will establish a better understanding of the development and flight test of unconventional tilt-rotor UAV.

2) This paper elaborates on the flight control system and anomalies associated with it, which are found during the flight test of tilt-rotor type Smart UAV.

• System integration rig testing • Aircraft iron bird integration and ground test 5 CertIFy • Flight test support • FAA/EASA/ANAC/TC regulatory agency support • Certification documentation support 6 DelIver • Hardware • Certification documentation • Product support and technical publications • Maintenance and fault isolation File Size: 1MB.This book provides a good introduction to the basics of flight test.

Instrumentation and airdata are well covered. The text includes material on performance, stability, and control testing. Requires some familiarity with atmospheric flight mechanics. I highly recommend this book.3/5(3).Service DATE: 25 August Notice PAGE: 2 of 2 MAIN ROTOR BLADE ROOT FITTING PERIODIC INSPECTION REQUIREMENTS REFERENCES: 1) MD Helicopters, Inc.

Handbook of Maintenance Instructions (CSP-HMI-2), Revis dated or later 2) MD Helicopters, Inc. Rotorcraft Log Book (CSP-RLB), Revision 2, dated Febru or laterFile Size: 81KB.