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The Measurement Test of Stiffness and Natural Frequencies for Bearingless Rotor System of Helicopter
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 Title & Authors
The Measurement Test of Stiffness and Natural Frequencies for Bearingless Rotor System of Helicopter
Yun, Chul Yong; Kim, Deog-kwan;
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 Abstract
The stiffness and natural frequencies for blades, flexbeam, and torque tube of bearingless rotor system are measured to determine the material input properties such as mass distributions and stiffness distribution for the rotor dynamics and load analysis. The flap stiffness, lag stiffness, and torsional stiffness are calculated by measuring section strain or twist angle, gages position, and applied loads through bending and twist tests. The modal tests are undertaken to find out the natural frequencies for flap, lag, torsion modes in non-rotating conditions. The stiffness values and mass properties are tuned and updated to match prediction frequencies to the measured frequencies. The rotorcraft comprehensive code(CAMRAD II) is used to analyze the natural frequencies of the specimens. The analysis results with the updated material properties agree well with the measured frequencies. The updated properties will be used to analyze the rotor stability, dynamic characteristics and loads for the rotor rotation test in a whirl tower.
 Keywords
Helicopter;Bearingless Rotor;Stiffness Measurement;Natural Frequency;Material Properties;
 Language
Korean
 Cited by
1.
Dynamic Characteristics of Helicopter Bearingless Main Rotor, Journal of the Korean Society for Aeronautical & Space Sciences, 2016, 44, 5, 439  crossref(new windwow)
 References
1.
Huber, H., 1992, "Will Rotor Hubs Lose Their Bearings" A Survey of Bearingless Main Rotor Development, The 18th European Rotorcraft Forum.

2.
Johnson, W., 1985, Recent Developments in the Dynamics of Advanced Rotor Systems, NASA TM-86669.

3.
Yun, C. Y., Kee, Y. J., Kim, T. J., Kim, D. K., and Kim, S. H., 2012, Hub Parametric Investigation of Main Rotor Stability of Bearingless Helicopter, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 22, No. 8, pp. 784-790. crossref(new window)

4.
Kee, Y. J., Yun, C. Y., Kim, D. K. and Kim, S. H., 2012, Dynamic Characteristic Analysis of a Bearingless Helicopter Rotor System, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 22, No. 2, pp. 187-192. crossref(new window)

5.
Yun, C. Y., Kim, T. J., Kee, Y. J., Sim, H. S and Kim, S. H., 2013, Basic Properties Test and Non-rotating Dynamic Test of Helicopter Rotor, Proceedings of the KSNVE Annual Autumn Conference, pp. 103-108.

6.
Kee, Y. J., Kim, T. J., Yun, C. Y. and Kim, D. K., 2014, Manufacturing Process and Basic Property Tests of Composite Helicopter Rotor Hub System, Transactions of the Korean Society of Mechanical Engineers A, Vol. 38, No. 6, pp. 691-698. crossref(new window)