Pu Jinyun

Intelligent Decision Support System of Ship Unsinkability Design in the First Design Stage

If the ship is damaged, we should try our best to guarantee its unsinkability. Ship unsinkability is one of the most important aspects of ship survivability. The intelligent decision support system of ship unsinkability design in the first design stage is founded in this paper. The intelligent decision support system consists of two main functions. One is manual ship unsinkability design and the other is intelligent ship unsinkability design which is introduced in detail in this paper. The survival probability calculation model, ship unsinkability mathematic optimization model and intelligent optimization arithmetic corresponding to the mathematic optimization model are founded in the intelligent decision support system. The gene arithmetic is improved in the intelligent optimization arithmetic. The gene sequence is defined based on the tradition gene definition. The chromosome defined in this paper can be considered as a special chromosome of which gene sequence is ordered. At last, design cases are given to explicate how the intelligent system helps in ship unsinkability design jobs.

Research on Wartime Damage Simulation and Intelligent Decision System of Ship Fire Fighting System

When the ship is attacked in the war, the wartime damage of fire fighting system will badly weaken the damage control capability and the survivability of warship. It is difficult for shipman to judge the damage state and make the damage control decision swiftly because of time and information constraints. So the design of a rapid and exact decision arithmetic for the wartime damage control of the damaged fighting system is very important. A new sort of method for modeling of damaged fire fighting system are brought forward firstly. Then based on intelligent decision arithmetic, the wartime damage simulation and intelligent decision system is founded. This intelligent decision system can improve effectively the decision-making and emergency repair capability of shipman in the wartime.

A research for warship virtual damage control command training system

According to the requirement of the warship damage control training, a damage control command training environment was built based on LAN with VR technique. A damage control command flow was plotted and system composes and frame was presented. Considered the key techniques to the system, the entity data structure and multi-entity capture determination method were supplied, and the mode of system information transition was brought out. System was design with Modularization ideas, virtual environment could be constructed easily with the map designed software provided. The system simulated the operating position of the warship, and offered a vivid environment to implement the damage control drill, Proposed a new method to the damage control command training.

Ship cabin damage mode identification arithmetic base on seawater ingress process

The seawater ingress sensors in cabins will be damaged when the ship is attacked on sea. And it is difficult for damage control monitors to accept the cabin flooding signals, so it is uneasy to judge which cabins are flooded for crews. Accordingly, it is necessary to set up an arithmetic to identify the flooded cabins, which only depends on ship poise signals in flooding process but not on the cabin flooding signals. Firstly, the generation arithmetic of the ships damage modes is set up by the width priority searching and back tracking method. Secondly, the identification course is analyzed, and the identification model of cabin damage modes is set up by gray relation theory associating with the above generation arithmetic. Lastly, one ship damage mode is identified, and its calculation result shows that the identification arithmetic is accurate.

Simulation Computation Study of the Damaged Ship Subjected to Underwater Explosion

The non-linearity rolling motion model is established when the damaged ship is subjected to underwater explosion, which not only describes the explosion effect, but also describes water ingress motion from the damaged crevasse. Then the motion equation is solved by Runge-Kutta iterative method in applying computer program environment. It is helpful to provide theory method for anti-flooding of ship.

The study of temperature and pressure in a cabin fire with water mist fire suppression

On the base of the heat release rate and the output of smoke in a closed cabin fire, the water mist model is founded with the zones model and the characteristic of water mist. The relation between temperature / pressure and time is solved by energy equation, mass equation, and gas equation; At the same time, the principle that fire could be put out by water mist is brought forward. At last, the result of a example is tested same as the real fire, and the rule is attained that gas temperature and air pressure are changed by water mist, it will help people know the fire under water mist, and help people put out a fire and succor themselves.

Notice of Retraction Research on Computation Methods of Fire Flowfield in Cylindrical Sealed Space

The main objective of the present work is an investigation of the computation methods applicability in a cylindrical sealed space, two different geometry constitute methods are introduced, multi-zone model and fluid dynamic model were discussed. Computation results of the two calculation methods are within err of 15% in radial direction, and has different results in the vertical direction upright the fire source, which was supposed to be caused by the two-zone hypothesis precondition. The study indicates the smoke layers delamination was distinct, and the temperature drops quickly in the longitude direction from the fire source.

Design of intelligent ship firemain reconfiguration system

The design of ship firemain intelligent reconfiguration system, which can detect, locate and isolate damage of ship firemain intelligently is given. The graph model and the math model of ship firemain system is described firstly; Then a new sort of diagnostic algorithms for intelligent rupture detection and location in firemain system is founded, which contains the function of error correction for rupture signal; At last the intelligent reconfiguration system of firemain system is founded and a operational instance is given to explain its advantage.

Computing on Fire-Induced Smoke Flow in Irregular Confined Space

This paper has discussed the fire-induced smoke flow geometry characteristics in irregular confined spaces, and use LES and mixture fraction numerically methods to compute the smoke flow in a round cross sectional confined spaces. Computed results has validated the forecast of the flow course, showing that the smoke layer descending faster upper the fire source than other locations. Along with the longitudinal and transverse size increase, the temperatures below 2 cm and 1/4D of the top obvious decline, meanwhile the max temperature of the top has delayed.

Research on Submarine Maneuverability of Flooded Compartment

The paper establishes the emergency recovery maneuver motion model. According to the characteristic of hydrodynamics coefficients on flooded submarine, attaining hydrodynamics coefficients of different angle of attack by limited ship model hydrodynamics experiment of large angle of attack. A sensitivity index is introduced to evaluate submarine’s controllability. The experiment results are regressed to two kinds of hydrodynamic coefficients for big sensitivity index hydrodynamic coefficients, then forecast the submarine’s maneuverability. The calculation example proves the validity and feasibility of applied method.