Bearing-less rotor ground resonance test method

Abstract

The invention discloses a bearing-less rotor ground resonance test method, and belongs to the technical field of bearing-less rotor test. The method comprises the following steps: 1, firstly constructing a bearing-less rotor simulation model and a testbed simulation model, and assembling the two models to carry out ground resonance calculation analysis; 2, verifying equipment in a test system, checking test pieces, debugging each system of the testbed, arranging test points, mounting a sensor, mounting an acceleration sensor at a propeller hub center to measure acceleration speeds in a rotation surface in two directions, mounting an acceleration sensor on a rotor shaft to measure an acceleration speed of the rotor shaft, and providing an overload monitor; 3, releasing an excitation signalby a signal source, transferring the excitation signal to an auto-bank unit via an excitation system, and driving paddles to carry out periodic variable-distance movement by the auto-bank unit; and 4,responding a time history by test points, acquired in the excitation process, on a rotor hub, a flexible beam and the testbed, and processing and analyzing a coupling modal frequency and modal damping of the bearing-less rotor and the testbed, so as to judge whether a ground resonance stability margin exists or not.

Description

technical field [0001] The invention belongs to the technical field of bearingless rotor tests, and in particular relates to a ground resonance test method of a bearingless rotor. Background technique [0002] Bearingless rotor is currently the most advanced structure type of helicopter rotor, which uses composite material flexible beam to replace the horizontal hinge, vertical hinge and axial hinge of traditional articulated rotor hub. Compared with the articulated rotor hub, the flexible beam has higher rigidity and complex deformation, and the blade flapping, shimmy and pitch-changing motion coupling is stronger, so that the aeromechanical coupling dynamic stability of the helicopter with the bearingless rotor configuration is more difficult than that of the articulated or spherical rotor. The ground resonance problem of the flexible hub rotor is more complicated and more prominent. [0003] The ground resonance test of the bearingless rotor-mounted test rig is carried o...

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Problems solved by technology

[0005] The purpose of the present invention: in order to solve the above problems, the present invention proposes a bearingless rotor ground resonance test method, through periodic variable pitch excitation disturbance, check the complex coupling situation under each state of the test bench, and require that it should be stable and should not occur resonance phenomenon ; Through the ground resonance stability test of the bearingless rotor assembly dynamics test bench, the correctness of the ground resonance modeling and analysis method of the bearingless rotor helicopter is verified, and the test data are provided for correlation analysis and model correction

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