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Saturday, May 9, 2020 | History

3 edition of Final report on the static calibration of the RSRA active-isolator rotor balance system found in the catalog.

Final report on the static calibration of the RSRA active-isolator rotor balance system

C. W. Acree

Final report on the static calibration of the RSRA active-isolator rotor balance system

by C. W. Acree

  • 280 Want to read
  • 24 Currently reading

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

    Subjects:
  • Helicopters.

  • Edition Notes

    StatementC.W. Acree, Jr.
    SeriesNASA technical memorandum -- 88211.
    ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15282959M

    The proposed field balancing and harmonic vibration suppression strategies are verified by simulations and experiments performed on a control moment gyro test rig with a rigid AMB-rotor system. Compared with existing methods, the proposed strategies do not require trial weights or an accurate model of the AMB-rotor system. Field balancing and harmonic vibration suppression in rigid AMB-rotor systems with rotor imbalances and sensor 56cc2fae96cddapdf Content available from CC BY

    Precautions and safeguards during in-situ balancing Balancing is the process by which the mass distribution of a rotor is checked and, if necessary, adjusted to ensure that the residual unbalance or the vibrations of the journals/bearing supports and/or forces at the bearings are within specified limits. Many rotors are balanced in specially. The EasyBalance Dynamic Balancing Machine Instrumentation System has been specifically produced for upgrading and modernizing existing balancing machines, both vertical and horizontal, regardless of brand or age. Use this high-end, digital system to get instant improvements in both results and operator efficiency. Use with.

    Unbalance - The Common Cause of Vibration & Premature Bearing Destruction within Rotating Machinery Equipment. Unbalance is defined as an unequal distribution of mass causing the mass axis to differ from the bearing axis. During rotation, the unequal mass along with the radial acceleration due to rotation create a centrifugal force.   In practical terms, at-speed balancing ensures correct static and couple balance reducing the radial movement at both critical and running speeds of the rotating device. It also relieves assembly stress or ‘relaxation’ of the rotor by operating under full centrifugal stress prior to final balancing.


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Final report on the static calibration of the RSRA active-isolator rotor balance system by C. W. Acree Download PDF EPUB FB2

Final Report on the Static Calibration of the RSRA Active-Isolator Rotor Balance System C. Acree, Jr. Ames Research Center MoHett FieZd, CaZifomia National Aeronautics and Space Administration Scientific and Technical Information Branch Get this from a library. Final report on the static calibration of the RSRA active-isolator rotor balance system.

[C W Acree; United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.].

Final report on the static calibration of the RSRA active-isolator rotor balance system. [Washington, DC]: [Springfield, Va: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; For sale by the National Technical Information Service] MLA Citation.

Acree, C. and United States. DESIGN AND DEVELOPMENT OF A MOTION COMPENSATOR FOR THE RSRA MAIN ROTOR CONTROL P. Jeffery*, R. Huber* ABSTRACT The RSRA, an experimental helicopter developed by Si korsky Aircraft for NASA and the U.

Army, is equipped with an active isolation system that allows. The rotor balancing methods can be classified as off-line balancing methods and real-time active balancing methods. The off-line rigid rotor balancing method is very common in industrial applications. In this method, the rotor is modeled as a rigid shaft, which cannot have elastic deformation during operation.

Theoretically, anyFile Size: KB. For spherical rotor of gyroscope and some other high speed rotor, static balance is important. The paper introduces a static balance method for spherical rotor: the position of the spherical rotor is fixed by the use of the special clamp apparatus, and then determines the unbalance mass using the electronic balance.

This method has no strict requirement to the clamp’s symmetry and dimension. General equilibrium characteristics of a dual-lift helicopter system [microform] / L.S. Cicolani and G. Technology needs for high speed rotorcraft (3) [microform]: final report; Final report on the static calibration of the RSRA active-isolator rotor balance system [microform] / C.

Balancing a Rigid Rotor Lab Report. 2 In static balancing, a balancing mass of 𝑚=𝑔 was determined. From the graph, the From the results obtained, an appreciable level of balance on the rigid rotor was achieved with little residual unbalance left on the rotor.

The aim of the lab was thus met. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

Final Technical Report: Full-scale Experimental Validation of Dynamic, Centrifugally Powered, Comprehensive quasi-static and dynamic actuator Rotor System with Trailing- Edge Flaps for Flight and Vibration Controls," Journal of Aircraft, No.

2, Apr-Maypp. General equilibrium characteristics of a dual-lift helicopter system [microform] / L.S. Cicolani and G. Helicopter Structural Integrity Program (HSIP) [microform] Technology needs for high speed rotorcraft (3) [microform]: final report; Final report on the static calibration of the RSRA active-isolator rotor balance system [microform] / C.

This report presents a summary of flight-test results obtained from the Rotor System Research Aircraft (RSRA-A/C ) in the compound configuration. The report covers the period from June to Augustduring which time 18 test flights were flown and 17 hr i0 min of flight time accumulated.

In addition. Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state — Part 1: Specification and verification of balance tolerances — Technical Corrigendum 1 ISO/TC /SC 2. An analytical, numerical and experimental investigation of the dynamic behavior of a passive balancing system is presented.

Due to the system constraints and dynamic characteristics, this system. Using a lumped mass model of a single rub-impact rotor system considering the gyroscopic effect, the stability and steady-state response of the rotor system are investigated in this paper.

The contact between the rotor and the stator is described by the simple Coulomb friction and piecewise linear spring models. An algorithm combining harmonic balance method with pseudo arc.

In the automatic balancing system, feedback from sensors measuring rotor motions or forces is used to drive active counterweights to null the unbalance and resulting vibrations. 22 To reduce two types of unbalances in the spinning rocket vehicles and satellites in the atmosphere, static and dynamic unbalances, Sethunadh and Mohanlal developed a.

the unbalance and placing weights on the rotor to counter the unbalance. As the rotor rotates (fig. 1), the unbalanced mass m tends to pull the rotor toward the bearings on the side the unbalance is located creating an apparent high spot on the shaft.

At very low speeds, this high spot will be in phase with the unbalanced (heavy) mass. Rotor Blade Static Balance – Art or Science. 3 Dynamic balancing is always the final solution Static balancing procedures do not replace dynamic tuning procedures, but augment the dynamic tuning process.

Dynamic balancing accommodates any cause for imbalance in the entire rotating system. Dynamic tuning is expensive to perform. The Rotor Systems Research Aircraft (RSRA) was a unique pure research aircraft developed to fill the void between design analysis, wind tunnel testing, and flight results of rotor aircraft.

Rotor Balance Data Sheet (Shop Balancing) This form to accompany every rotor to be balanced U MAX = 4 W/N Where: U MAX = the maximum allowable unbalance per plane in oz -in. W = static journal load in lbs. (for symmetrical rotors, ½ rotor weight) N = the maximum continuous rotating speed in RPM In some special cases a standard of 1 W/N.

Does anyone know the importance of having a balance piston fitted to a female rotor. As with Mycoms, they are not fitted. Other machines such as Howdens include them.

The female rotor generally spins slower and has less surface area on discharge. Is this just a safety measure to prolong the thrust bearings?

Interested to hear some feedback.On-Line Balancing Of Rotors A. S. Sekhar and Debraj Sarangi Deptt. of Mechanical Engg. IIT KharagpurINDIA [email protected] ABSTRACT Rotor balancing needs to be re-examined in the present day's context. With the advancement in control strategies and active vibration control using magnetic bearings, a.The rotor itself may be perfectly round; however, for one reason or another, the center of rotation is off centered.

Addition of Keys and Keyways A manufacturer may balance their product with a full key, a half key, or no key at all.