A Test Method for Bearingless Rotor Ground Resonance

Abstract

The invention discloses a ground resonance test method for a bearingless rotor, belonging to the technical field of bearingless rotor tests. Including: step 1, first constructing the simulation model of the bearingless rotor and the test bench, and after assembling the two models, performing calculation and analysis of the ground resonance; Commissioning; arrangement of measuring points and installation of sensors; an acceleration sensor is installed in the center of the propeller hub to measure the acceleration in two directions in the rotating plane; an acceleration sensor is installed on the rotor shaft to measure the acceleration of the rotor shaft and provide overload monitoring; steps 3. The signal source releases the excitation signal, and the excitation signal is transmitted to the automatic tilter through the excitation system, and the automatic tilter drives the blades to perform periodic variable pitch motion; step 4, during the excitation process, collect the rotor hub, the flexible beam and the test bench. The response time history of the measuring point is used to process and analyze the coupling modal frequency and modal damping of the bearingless rotor and the test bench, and judge whether there is a ground resonance stability margin.

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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