A shake test of the Large Rotor Test Apparatus (LRTA) was performed in an effort to enhance NASAscapability to measure dynamic hub loads for full-scale rotor tests. This paper documents the results of theshake test as well as efforts to calibrate the LRTA balance system to measure dynamic loads.Dynamic rotor loads are the primary source of vibration in helicopters and other rotorcraft, leading topassenger discomfort and damage due to fatigue of aircraft components. There are novel methods beingdeveloped to reduce rotor vibrations, but measuring the actual vibration reductions on full-scale rotorsremains a challenge. In order to measure rotor forces on the LRTA, a balance system in the non-rotatingframe is used. The forces at the balance can then be translated to the hub reference frame to measure therotor loads. Because the LRTA has its own dynamic response, the balance system must be calibrated toinclude the natural frequencies of the test rig.


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    Title :

    Shake Test Results and Dynamic Calibration Efforts for the Large Rotor Test Apparatus


    Contributors:

    Conference:

    Decennial AHS Aeromechanics SpecialistsaEuro(TM) Conference ; 2014 ; San Francisco, CA, United States


    Publication date :

    2014-01-22


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English






    Calibration Results of the NASA Ames Rotor Test Apparatus Steady/Dynamic Rotor Balance

    Van Aken, J. M. / Peterson, R. L. / Freedman, C. et al. | British Library Conference Proceedings | 1993


    Calibration Results of the NASA Ames Rotor Test Apparatus Steady/Dynamic Rotor Balance

    Van Aken, J. M. / Peterson, R. L. / Freedman, C. et al. | British Library Conference Proceedings | 1994