Research On The Method And Experiment Of Precise Location Method For Naval Ship Pipeline Damage

With the rapid and continuous improvement of ship automation level and the reliability of ship-borne equipment,the Navy has increasingly higher requirements for loss management automation capabilities.The ship’s pipeline network system operates uninterruptedly under high load at all weather,and has been under the interference of complex environments for a long time.Under daily conditions,the probability of accidents such as leaks has increased significantly.However,during wartime,the pipelines in weak positions and vulnerable positions in combat are more likely to be damaged due to blows.If these possible leaks are not located in time,they will most likely cause a devastating blow to the ship’s combat capability and survivability.Therefore,it is of great significance to study a precise method for locating leaks in a ship’s pipeline network.the Navy has higher requirements for loss management automation capabilities.The ship’s pipeline network system operates uninterruptedly under high load throughout the day and has been in the influence of the strong non-linear environment for a long time.In this state,the probability of accidents such as leakage increases significantly.However,during wartime,the pipelines in weak positions and vulnerable positions in combat are more likely to be damaged due to attack,which greatly affects the combat capability and survivability of ships.Therefore,it is of great significance to study a precise method for locating leaks in a naval ship’s pipeline network.In this paper,aiming at the problem of leakage location of ship pipeline network,the principle,method and influencing factors of leakage location were analyzed and studied.Firstly,the theories of fluid mechanics and fluid network were analyzed,and combined with the flow in the pipe,the transient characteristics of fluid are applied to identify the leakage,and the principle of optimized pressure gradient based on curve fitting was proposed to locate the leakage.Then,the pressure gradient method was verified by the Flowmaster(?),a fluid analysis software,which proved the feasibility and accuracy of leak location based on the optimized pressure gradient principle.On this basis,the influence of pipe diameter,pressure,sensor arrangement,elevation and equivalent length on positioning accuracy was studied,and the accuracy positioning model is obtained:6 sensors for upstream and downstream respectively.Then designed and built an experimental platform for experimental verification,which proves the applicability of the optimized pressure gradient method and the authenticity of the simulation results.The results show that the average error of the optimized pressure gradient method is 2～3%.The positioning accuracy is high.Applying the equivalent length can significantly improve the positioning accuracy of the pressure gradient method.The positioning sensor layout strategy based on the actual situation of the pipe network has enhanced the practical application value of the optimized pressure gradient method.