船舶尾流氣泡幕電磁特性研究
[Abstract]:When a ship moves on the sea, it produces a wake in the opposite direction of motion, that is, the ship's wake. The wake is caused by the disturbance of the ship hull and propeller to the sea water, forming a bubble curtain belt with various physical properties. Influenced by weather, air temperature, water temperature, sea area, speed and so on, the wake has different physical and physical characteristics. Studying these characteristics and characteristics can map out the information of the ship itself, such as type, tonnage, speed, etc., to the military, Ocean observation and other fields are of great significance. The main contents of this paper are the electromagnetic properties of ship wake bubble curtain, including the following aspects: first, using the self-developed experimental device to simulate the formation of wake bubble curtain, on the basis of which, The single propeller wake and the double propeller wake are collected, the image is processed with MATLAB software, and the gray scale is extended, and the gray histogram is transformed. Finally, the experimental results are analyzed. The frequency distribution law of different gray levels among the three is obtained. The Canny algorithm is used to detect the weak edges and the experimental results are obtained. Conclusion it provides a basis for further research on wake image informatization. Secondly, the basic theory of detecting wake electromagnetic field by airborne magnetic sensor and the basic theory of detecting magnetic anomaly caused by ship motion on water are analyzed systematically, and the mathematical model is established. Thirdly, based on Maxwell's equations and the basic equations of magnetohydrodynamics, the calculation method and solution method of magnetic anomaly caused by electromagnetic wake in geomagnetic field are deduced and analyzed. Under certain conditions, the magnetic anomalies of different downstream distances of ship wake are calculated and analyzed. The results show that with the increase of downstream distance of wake, the intensity of magnetic field becomes weaker and weaker, and the intensity of magnetic field decreases sharply within the initial 4km. The results show that the magnetic field intensity is between 0.17 脳 10-4A/m~2.2 脳 10-4A/m and 0.17 脳 10-4A/m~2.2 脳 10-4A/m when the downstream distance of wake is within 20km. It can be effectively detected by magnetometer.
【學(xué)位授予單位】:西安工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U661
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