Elastic supporting device vibration strain monitoring method

Abstract

The invention discloses an elastic supporting device vibration strain monitoring method. A supporting body of an elastic supporting device comprises a bearing pedestal and a plurality of elastic cage strips which are distributed in the circumferential direction of the bearing pedestal, wherein one end of each elastic cage strip outwards extends in the radial direction of the supporting body to form an installation edge, and a gap is formed between the circumferential outer wall of the bearing pedestal and a machine box and filled with lubricating oil so as to form an extruded oil film damper. The method includes the steps that a strain gauge is attached to at least one elastic cage strip and connected to a vibration strain measuring instrument outside the machine box through a lead, and the vibration strain value of the strain gauge is detected through the vibration strain measuring instrument; whether the detected vibration strain value is larger than the preset vibration strain alarm threshold value or not is judged, and an alarm signal is generated if yes. By detecting the vibration strain value of the strain gauge, the vibration strain of the elastic supporting device is accurately detected, it is ensured that a journal of the bearing pedestal works within an extruded oil film linear area, an alarm is given once the vibration strain value exceeds the threshold value, and safe running performance of a rotor is improved.

Description

technical field [0001] The invention relates to the field of vibration strain monitoring, in particular to a method for state monitoring and vibration fault identification for high-speed rotor operation of small and medium-sized aviation turboshaft engines. Background technique [0002] For a long time, in the development process of aero-engines, accelerometers or speedometers are installed on the casing to obtain the vibration information transmitted to the casing by the rotor during operation. The specific method is to install the sensor seat at the vertical and horizontal positions near the front and rear fulcrums of the engine, and then install the accelerometer or speedometer on the sensor seat with M5 bolts to realize the vibration monitoring of the engine. [0003] These signals may be sufficient for the vibration monitoring of large and medium-sized aeroengine rotors with rigid support and a rotational speed below 18000r / min. However, these signals are not enough fo...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for monitoring the vibration and strain of an elastic support, so as to solve the problem that the vibration information of the existing casing cannot accurately reflect the vibration strain of the elastic support and the extrusion oil film damper of the elastic support cannot reliably work in the oil film linear District Technical Issues

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