Air corrosion monitoring system of area distributing drainage building

Abstract

This invention discloses a area distributed drain building cavity erosion detecting system. The system is made up by sensor, transmission cable, analysis system, early warning and alarm system. One fiber optic sensor is reticular laid on two cross section of building surface, two fiber optic sensors are connected to fiber vibration survey meter through optical cable, the meter transfers the vibration signal to signal processing and analysis module, and the module decomposes the signal into high frequency component and low frequency component, and output corresponding self power spectrum and cross correlation spectrum, the high frequency signal is sent to cavitation early warning system, the low frequency signal is sent to cavity erosion grade alarm system. The detecting range is wide, diagnose accuracy rate is high, durability is good, regional synchronous cavitation cavity erosion detecting can be realized. The forward end of fiber optic network is passive, all supplying equipments and detecting equipments are in control room in distant, execution and running is convenient.

Description

【Technical field】 [0001] The invention relates to the technical field of automatic monitoring of drainage building structures in water conservancy and hydropower projects, in particular to a cavitation monitoring system for regionally distributed drainage structures. 【Background technique】 [0002] At present, there are many examples of damage to drainage structures in water conservancy and hydropower projects. Cavitation damage occupies a considerable proportion in it. However, people's monitoring of cavitation and cavitation is mainly concentrated on hydraulic machinery such as hydraulic turbines and water pumps, and corresponding technologies and products have been formed, such as measuring the pressure of flow-passing parts, water pressure pulsation, vibration, noise, or monitoring the abrasion of blades damage, reduced turbine efficiency, etc. So far, people have not paid enough attention to the cavitation and cavitation monitoring of drainage structures, and there is...

AI Technical Summary

Problems solved by technology

There are the following problems and defects in using the cavitation monitoring instrument of hydraulic machinery for cavitation monitoring of flood discharge structures: (1) The area where cavitation damage may occur in discharge structures is wide, and the monitoring range of "point" sensors is not large enough, which is easy to (2) The flow rate of the drainage structure is high, and the vibration and noise before cavitation are relatively large. The "signal-to-noise ratio" of cavitation monitoring is relatively small, and the "point" type Sensors are prone to "misdiagnosis"; (3) These "point" sensors are subjected to high-speed water flow for a long time, and the instrument is prone to failure

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