Helicopter rotor balancing apparatus and method

Details Helicopter rotor balancing apparatus and method Helicopter rotor balancing apparatus and method

1975-04-21

1976-03-23

Gill, James J.

Measuring and testing

Rotor unbalance

Propeller, impeller, or fluid coupling

G01M 122, G01M 128

Patent

active

039452565

ABSTRACT:
The method of balancing a rotor having multiple blades and defining an axis of rotation, and wherein structure proximate the rotor is subject to vibratory motion due to dynamic unbalance of the rotating rotor and an out-of-track condition of the rotor blades, the method employing two vibration pickups, the method including:
A. operating the pickups to produce vibratory signals corresponding to up and down vibratory motion of the structure at port and starboard sides of said axis,
B. combining said signals to produce a resultant oscillatory output signal characteristic of rotor vibratory motion due substantially to only one of said conditions,
C. using said resultant output signal to alleviate said one condition.

REFERENCES:
patent: 2343383 (1944-03-01), Martin et al.
patent: 3802273 (1974-04-01), Helmuth et al.

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