Design And Implementation Of Pressure Vessel Leakage Detection System Based On Ultrasonic Array

In order to ensure the normal and safe operation of gas storage and transportation equipment and avoid catastrophic damage caused by gas leakage,it is very important to effectively detect and locate the gas leakage location.With the rapid development of array signal processing technology,sensor array is widely used to locate sound source signals.Sensor array-based gas leakage detection and location method has gradually become one of the hot research directions in the field of gas leakage detection and location because of its good stability,strong anti-interference and high accuracy.This paper aims at the design of pressure vessel leakage detection system based on ultrasonic array.Firstly,it describes the pressure vessel leakage detection method and sound source location method as well as the development status.Based on the principle of ultrasonic signal generated by pressure vessel leakage,the characteristics of leakage signal are analyzed to lay a foundation for solving the problem of leakage signal detection and location.By comparing and analyzing different ultrasonic array models,the five-element circular array model is selected.Secondly,the hardware and software of the leakage detection system are designed.The hardware circuit can realize the collection,filtering and amplification of the leakage signal,and the software part can display the signal waveform to complete the transmission,preservation and analysis of the leakage signal data.The hardware part and the software part cooperate with each other to realize the leakage detection function of the whole system.In order to solve the problem that the leakage aperture is difficult to identify,this paper uses Euclidean distance classification algorithm to process the leakage ultrasonic signal,which can improve the accuracy and reliability of the leakage aperture identification of pressure vessels.In order to solve the problem that the pressure vessel leakage source is not easy to locate,this paper selects the time arrival difference locating algorithm which is suitable for the leakage signal and has good estimation performance.Finally,the leakage aperture quantitative detection and sound source location can be realized.Finally,a test platform was built to simulate pressure vessel leakage.Through the test,the leakage detection system designed in this paper can accurately identify the circular simulated leak hole with a diameter of 0.3mm～1.0mm when the pressure of the vessel is -75 kPa～-60 kPa and the sensor array is 200 mm away from the leak source,and the accuracy rate can reach 96%.Under the same conditions,the leakage source can be located effectively when the simulated leakage aperture is 0.5mm.The effective detection distance of the leak detection system is 400 mm.