Squeeze oil film damper distributed pressure test device and test method

Abstract

The invention relates to a distributed pressure test device of an extrusion oil film damper. The test device comprises a fiber grating sensing test device, a first support, a turntable shaft, a secondsupport, a coupler, a drive motor and a base. Besides, a testing method for the distributed pressure of an extrusion oil film damper includes the steps of fiber grating sensing sensor arrangement, sensor packaging, parameter calibration, and temperature compensation and decoupling. The test device has a simple structure and is capable of simulating the distributed pressure test change of the extrusion oil film damper of a gas turbine engine under the complicated working conditions like rotor imbalance and fulcrum misalignment. The spatial pressure distribution association relationship of circumferential multiple points and axial multiple surfaces of the extrusion oil film damper under the complicated working conditions can be tested by the pressure testing method. The fiber gating sensorhas advantage of one line with multiple points, high sensitivity, and small size; the sensor is arranged conveniently; and the influence and modification on the extrusion oil film damper are low. Withtemperature compensation and decoupling, the influence on the test result by the temperature change is reduced, so that the pressure test result becomes accurate.

Description

technical field [0001] The invention relates to the field of gas turbine engines in rotating machinery. Background technique [0002] Squeeze oil film damper is an important damping structure supported by the rotor of gas turbine represented by aero-engine. Lubricating oil is passed through the gap between the outer ring of the squirrel cage and the inner ring of the web to form an extruded oil film. Consume the vibration energy of the rotor and reduce the external load and vibration of the aeroengine rotor; the pressure distribution and size of the squeeze film damper are the key parameters when it works, which directly affects its vibration reduction effect, and the circumferential pressure of the squeeze film damper And the pressure distribution along the axial direction changes with the working conditions of the aeroengine rotor, such as rotor unbalance, rubbing and other working conditions that cause complex changes in the pressure distribution of the squeeze film dampe...

AI Technical Summary

Problems solved by technology

Judging from the current published information, there is a lack of distributed pressure test methods for squeeze oil film dampers, and the use of traditional pressure sensors and strain gauges will not be able to achieve effective testing of distributed pressure due to the size limitation of pressure sensors. The oil film damper has undergone many changes, and the effective experimental data of the pressure of the squeeze oil film damper under complex working conditions cannot be obtained, so that the theory cannot be verified and the design can be effectively improved

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