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Saturday, May 2, 2020 | History

2 edition of Analysis of rotor vibratory loads using higher harmonic pitch control found in the catalog.

Analysis of rotor vibratory loads using higher harmonic pitch control

Analysis of rotor vibratory loads using higher harmonic pitch control

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  • 13 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va.? .
Written in English

    Subjects:
  • Rotors -- Vibration.

  • Edition Notes

    StatementTodd R. Quackenbush ... [et al.].
    SeriesNASA contractor report -- 189591., NASA contractor report -- NASA CR-189591.
    ContributionsQuackenbush, Todd R., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17676037M

    SPIE Digital Library Proceedings. HHC higher harmonic control IBC individual blade control IBL interactive boundary layer The pitch-link loads in this maneuver are dominated by severe the vibratory loads at the rotor hub, and the vibratory response in the fuselage. The vibratory loads on the blade are discussed here, and theFile Size: 10MB.

    "The Effect of Higher Harmonic Control on the Vibratory Loads and Airframe Vibration Reduction of a Light Helicopter" ERF, 39th European Rotorcraft Forum, September , Moscow. C. Onat, M. Sahin, Y. Yaman " Optimal Control of a Smart Beam by Using a Luenberger Observer". Vibrations are also beneficial for many purposes such as atomic clocks that are based on atomic vibrations, vibratory parts feeders, paint mixers, ultrasonic instrumentation used in eye and other types of surgeries, sirens and alarms for warnings, determination of fundamental properties of thin films from an understanding of atomic vibrations.

    ABSTRACT Title of Dissertation: PIEZOELECTRIC HYDRAULIC HYBRID ACTUATOR FOR A POTENTIAL SMART ROTOR APPLICATION Jayant Sirohi, Doctor of . Vibration control experiments using piezoelectric transducers on a wind turbine blade Jeffery D. Tippmann ; Francesco Lanza di Scalea Proc. SPIE , Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems , H (19 April ); doi: /


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Analysis of rotor vibratory loads using higher harmonic pitch control Download PDF EPUB FB2

Get this from a library. Analysis of rotor vibratory loads using higher harmonic pitch control. [Todd R Quackenbush; Langley Research Center.;]. Tiltrotor Wing-Root Vibratory Loads Reduction Through Higher Harmonic Control Actuation Article in Journal of Aircraft 49(6) November with 10 Reads How we measure 'reads'.

An advanced higher harmonic control (HHC) analysis has been developed and applied to investigate the effects of HHC on vibratory hub loads, blade and control system fatigue loads, rotor Author: Christoph Keßler. Similarly, loads and motions that occur at the higher harmonics are termed “2P, 3P, etc.” Luckily, and perhaps surprisingly to those unfamiliar with rotor dynamics, forces at all frequencies except the blade passage frequency “cancel out” at the rotor hub (where the blades are mounted).

For example, for a 4-bladed helicopter, the only. Rotor-based approaches aim to reduce the vibratory loads that are transmitted through the hub to the airframe. Examples are higher harmonic control (HHC) and individual blade control (IBC), active flap control (AFC), and trailing edge flap (TEF) control [,] [] [] [].

A higher harmonic control system drives the blades in pitch at the (N-l)P, NP, and (N+1)P harmonics of rotor rotational speed, generating new unsteady airloads, which in combination with the new oscillatory inertial loads, cancel the harmonics of blade loads that cause airframe vibration.

Higher Harmonic Control (HHC)The main objective of this concept is to generate higher harmonicunsteady aerodynamic loads on the rotor blades that cancel theoriginal loads responsible for the vibrationThe unsteady aerodynamic loads are introduced by adding higherharmonic pitch input through actuation of the swash plate athigher harmonics.

Yuan, K.A., Friedmann, P.P.: Structural optimization for vibratory loads reduction of composite helicopter rotor blades with advanced geometry tips. Helicopter Soc. 43(3), – () Google Scholar. This paper discusses open-loop and closed-loop active control investigations of a full-scale Bo helicopter rotor with active camber morphing.

The potential of an active camber morphing concept to reduce non-rotating vibratory hub loads and rotor power using active control was : Sumeet Kumar, Dominik Komp, Manfred Hajek, Jürgen Rauleder.

Full text of "Identification of random loads impinging on the RAH Comanche Helicopter empennage using spectral analysis" See other formats DUDLEY KNOX LIBRARY ^Y^ STGRADUATE SCHOOi MONTEgEY C/ 5 1 q 1 NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS IDENTIFICATION OF RANDOM LOADS IMPINGING ON THE RAH COMANCHE HELICOPTER.

To fulfill the objective of a predictive tool for rotorcraft, comprehensive analysis (CA) needs to be capable of providing both accurate and time-efficient predictions of rotor air loads and structural loads.

The more recent methodology based on comprehensive analysis coupled with high-fidelity computational fluid dynamics (CFD) has shown improved predictions of air loads, but it has not the Cited by: 3. The present conference on helicopter technologies discusses the application of chaos methods to higher harmonic control of rotors, a FEM model reduction application to rotorcraft structure applications, the numerical simulation of powered-lift flows, V/STOL concepts for special applications, advanced rotorcraft transmissions, advanced.

This book provides a thorough explanation of the principles and methods used to analyse the vibrations of engineering systems, combined with a description of how these techniques and results can be applied to the study of control system dynamics.

Engineering Vibration Analysis with Application to Control Systems, 1st_(C. Beards).pdf. Failure analysis of the blades of a horizontal axis hydrokinetic turbine of 1 kW is presented.

Analysis consisted of the determination of the pressure on the blade surface using Computational Fluid Dynamics, and the calculation of the stress distribution in the blade due to hydrodynamic, inertial and gravitational loads using the finite element by: 2.

Exploiting the properties of piezoelectric materials to minimize vibration in rotor-blade actuators, this book demonstrates the potential of smart helicopter rotors to achieve the smoothness of ride associated with jet-engined, fixed-wing aircraft.

Vibration control is effected. Experimental validation of wind turbine higher harmonic control using shaft loads measurements free download ABSTRACT In order to achieve reductions in wind turbine structural loads and to enable further increase of wind turbine rated power and dimensions, individual pitch control algorithms received significant portion of attention in the.

Finite elements analysis and modeling of permanent magnet synchronous machine including higher order space harmonic terms.

Duru, T. | Analysis and calculation of rotor loss of high speed permanent magnet synchronous motor. Wang Dynamic performance analysis of control systems for a shaft generator system for constant output voltage.

VIBRATION waveform as shown in the time drawing on the left side. This is the summation of all the vibration present at that location. Spectrum analysis enables us to untangle this complex waveform and make a representation of its original components on a diagram showing frequency on the X-axis and amplitude Size: KB.

Reduced In-Plane, Low Frequency Noise of an Active Flap Rotor and closed-loop active-flap control on rotor loads, vibration, Wakes and Aeroacoustics with Higher-Harmonic Pitch Control (HHC) Inputs – The Joint German/French/Dutch/US Project,” Presented at the.

Laxman Vaitla and Venkatesan, C., “Influence of Dynamic Stall and Dynamic Wake Effects on Helicopter Trim and Rotor Loads”, AHS Specialist's Conference on Aeromechanics. Fisherman's Wharf, San Francisco, CA (USA). Vibration Analysis and Control – New Trends and Developments 26 Brennan, M.J. ().

Vibration control using a tunable vibration neutraliser. Proc. IMechE Part C, Journal of Mechanical Engineering Science, Vol, pp. Brennan, M.J. (). Actuators for .Wind loading from turbulence and gusts can cause damage in horizontal axis wind turbines. These unsteady loads and the resulting damage initiation and propagation are difficult to predict.

Unsteady loads enter at the rotor and are transmitted to the drivetrain. The current generation of wind turbine.Line start permanent magnet synchronous motors (LS-PMSM) are preferred more and more in industrial applications, because they can start on their own and because of their high efficiency.

In this study, a new LS-PMSM rotor typology is suggested, which is modelled using surface mount permanent magnets, in which two different slot types have been used by: 6.