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http://dx.doi.org/10.5050/KSNVE.2015.25.12.881

The Measurement Test of Stiffness and Natural Frequencies for Bearingless Rotor System of Helicopter  

Yun, Chul Yong (Korea Aerospace Research Institute)
Kim, Deog-kwan (Korea Aerospace Research Institute)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.25, no.12, 2015 , pp. 881-887 More about this Journal
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;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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