Rotor fulcrum load identification experimental device and method based on retainer spring squirrel cage strain

Abstract

The present invention provides a rotor fulcrum load identification experimental device and method based on a retainer spring squirrel cage strain. The device comprises a squirrel cage test device, fulcrums, a turntable shaft, a coupler, a drive motor, a base, and an axial pretensioning device. The load identification method comprises the following steps of: sensitivity analysis of a squirrel cageunder combined load conditions; arrangement of a squirrel cage test device sensor; force parameter static calibration; and force parameter dynamic identification. The rotor fulcrum load identificationexperimental device and method achieve the composite load test and identification of the radial and axial loads of the retainer spring-rotor system fulcrum, employ a decoupling decomposition method to avoid radial and axial load coupling influences, and the identification test result is more accurate; the test device is simple in structure to simulate the experiments in complex working conditionssuch as the bearing pretensioning state, the unbalance rotor, the blade axial push load and fulcrum misalignment so as to provide technical support for the gas turbine engine rotor system fulcrum load change research in the complex working conditions.

Description

technical field [0001] The invention relates to the field of gas turbine engines in rotating machinery. Background technique [0002] The working conditions of the rotor system of gas turbine engines such as aeroengines are extremely complex, such as blade rubbing, flying loss, over-critical rotor system, unbalance, and alternating axial load caused by air flow will cause load changes at the fulcrum of the rotor system , only by accurately obtaining the fulcrum load of the rotor system can the strength analysis of the spring squirrel cage and rotor vibration control be effective. Therefore, the identification of the fulcrum load of the rotor system is of great significance for the research of the rotor system of gas turbine engines such as aeroengines. [0003] The rotor system of an aero-engine generally adopts an elastic support structure (hereinafter referred to as an elastic support structure, such as a squirrel-cage structure), which is used to comprehensively adjust th...

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Problems solved by technology

At present, although there are some literatures and patents aiming at the vibration research of the elastic support-rotor system, strain gauges are used to study the strain or vibration of the elastic squirrel cage structure, such as papers: High cycle fatigue test of series squirrel cage elastic support (Yang Zhengbing), squirrel cage elastic Supporting structure parameter optimization design and test (Feng Guoquan) and patent: elastic supporter vibration strain monitoring method (201410282663.7), etc., but most of them focus on radial load or vibration. It also bears axial loads such as bearing axial preload, blade excitation axial thrust load, and axial alternating force generated by the turntable bias, so only radial load or vibration research is carried out. On the one hand, a single radial The load test includes the effect and influence of the axial load, and the test results are inaccurate. On the other hand, the pure radial load test will also make the test more limited, making it difficult to find and reveal problems in the axial load or vibration of the rotor system, such as blades Changes in airflow alternating force, axial alternating force generated by turntable bias gyro torque, etc.

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