Method for adjusting vibration in rotating surface of rotor hub of a helicopter
A helicopter rotor and vibration adjustment technology, which is applied to rotorcraft, motor vehicles, aircraft, etc., can solve outstanding problems and achieve high efficiency
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[0031] see figure 2 , taking the specific vibration adjustment method of the rotor hub with four blades as an example:
[0032] After testing, the initial vibration value of the rotor hub is 0.9ips, and the phase is 5:28 (clock notation), which is represented by the "T" point at figure 2 According to the figure, the rotation direction of the rotor of this type of aircraft is clockwise when viewed from above.
[0033] The damper of the propeller arm 4 that lags behind the vibration phase and is closest to the 90° phase difference from the vibration phase can be selected for adjustment; the adjustment method is: the dynamic stiffness increases, and the increase is eccentric force / average damper displacement;
[0034] Or select the damper of propeller arm 2 that is ahead of the vibration phase and has the closest 90° phase difference to the vibration phase for adjustment; the adjustment method is: the dynamic stiffness is reduced, and the reduction is eccentric force / average d...
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