Equations of motion are derived for blade of variable mass and stiffness distribution and solution presented; natural frequencies of blades can be changed appreciably by varying locations of blade hinges, and ratios of natural frequency to rotor speed below value of 6.0 are essentially constant for variations in rotor speed consistent with helicopter and VTOL applications.
Analysis of flapwise bending frequencies and mode shapes of rotor blades having two flapping hinges to reduce vibration levels
NASA -- Tech Note
1960
28 pages
Aufsatz (Zeitschrift)
Englisch
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