METHOD OF DETERMINATION OF UNBALANCE OF HELICOPTER MAIN ROTORS Russian patent published in 2005 - IPC

Abstract RU 2247344 C1

FIELD: testing technology.

SUBSTANCE: proposed method includes measurement of amplitude of angular oscillations of helicopter fuselage ϕ relative to its longitudinal axis caused by unbalance and longitudinal trial unbalance ΔS_x in two diametrically opposite positions relative to axis of rotation of rotor in straight line running through axis of rotation of rotor located in longitudinal plane of symmetry of helicopter, transversal trial unbalance ΔS_z in two diametrically opposite positions relative to rotation of rotor in straight line running through axis of rotation of rotor and perpendicular to longitudinal plane of symmetry of helicopter when blade of non-rotating rotor is mounted on one main rotor in turn at angular position ψ and unbalance is calculated. Trial unbalances ΔS_x and ΔS_z are set on other main rotor and amplitudes of angular oscillations of helicopter fuselage α are additionally measured; longitudinal unbalances of rotor SR.x

and rotor SN.R.x

and transversal unbalances of rotor SR.z

and rotor SN.R.z

are calculated by definite mathematical expressions.

EFFECT: enhanced reliability of tests.

3 dwg

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RU 2 247 344 C1

Authors

Voronkov A.Z.

Dates

2005-02-27—Published

2003-10-29—Filed