Turbine small shaft bending vibration and torsional vibration parallel measurement method based on overspeed protection signals

Abstract

The invention discloses a turbine small shaft bending vibration and torsional vibration parallel measurement method based on overspeed protection signals, and belongs to the technical field of turbineset vibration measurement and signal processing. According to the method, a plurality of existing overspeed protection signals are used for obtaining bending vibration and torsional vibration signalsof a small shaft of a machine head in parallel, and the technical problem that the vibration of the small shaft of the machine head is difficult to test is solved; and the overspeed protection signals are demodulated in real time such that the bending vibration and torsional vibration states of the small shaft of the machine head are dynamically monitored. Moreover, the method is completely basedon an existing speed measuring gear probe at the small shaft of the machine head, a sensor does not need to be additionally arranged, equipment installation problems are avoided, and the equipment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of vibration measurement and signal processing of a steam turbine unit, and in particular relates to a parallel measurement method for bending and torsional vibration of a small shaft of a steam turbine based on an overspeed protection signal. Background technique [0002] Vibration is known as the "thermometer" of mechanical equipment, which can directly reflect the safe operation of equipment. The comprehensive measurement of bending vibration and torsional vibration is very important for the analysis, diagnosis and fault prediction of the operating state of the unit. Severe bending vibration and torsional vibration will cause bearing damage, wear of the flow part, bending of the large shaft, fatigue damage of the shaft and coupling, etc., seriously endangering the safety of equipment operation. In current engineering practice, the small shaft of the machine head is located at the outstretched end of the ...

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Problems solved by technology

[0004] To sum up, at present, most of the steam turbines are equipped with multiple speed probes for overspeed protection at the small shaft of the machine head, but they are not designed to install bending vibration and torsional vibration measurement probes, which affects the vibration of the machine head. Condition Monitoring and Analysis Diagnosis

If a flexural vibration torsional vibration probe is added to the small shaft, it will not only increase the cost of the sensor and the measurement channel of the testing instrument, but also the installation of the sensor is very inconvenient due to structural constraints

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