ࡱ> Y 4tbjbjWW ܥ==k]L4\&DU6U6U6sAuAuAuA(ABC$DFC-U6)p U6U6U6C<$<<<U68sAU6sA<(<@SAsA$5((-8kARESEARCHING OF POSSIBILITIES IN DEVELOPING A PROTOTYPE OF ONE EXPERT ENGINE DIAGNOSTIC TOOL IN MARINE SHIPBUILDING Vladimir `imovi, Slavko `imundi, Miroslav Ba a Ministry of Interior of Republic of Croatia, Police Academy, Police College in Zagreb, Av. Izviaa bb., 10 000 Zagreb, Republic of Croatia Fax-address: (+385) 01/2391-415; E-mail: zlatko@kondor.fkz.hr ABSTRACT: Objectives of this work are to research possibilities and right ways to develop a prototype of one expert engine diagnostic tool in marine shipbuilding. The prototype of one expert engine diagnostic tool has to automatically shut down an engine if one of critical or linked together component needs to shut down (because of overheating and low oil), etc. The prototype system must detect only basic rules and because of that completing application needs further analysing, detecting and adding new rules to solve all possible problems of one engine in marine shipbuilding. The obtained results can be used in a further process of developing complete application to an acceptable degree. This prototype can assist in diagnose and solving basic engine maintenance problems (with: oil, fuel, parts, etc.). Developed engine diagnostic rules and relations are basic rules for further researching of all rules in one expert engine diagnostic tool. KEY WORDS: developing a prototype, expert engine diagnostic tool, ship construction 1. INTRODUCTION Undoubtedly, such impressive development of information science and other sciences, their techniques and technologies had an impact upon all areas of human activity and particularly upon the manufacturing and servicing industries. That development affected the shipbuilding industry as a whole, and particularly in adopting of the up-to-date informational and other technical solutions in the process of ship construction. Production phase is one of the very significant steps in the process of the global ship construction process and respectively in the global model of ship production model in shipbuilding (global scheme is shown in the Figure 1st).  SHIPYARD ENVIONMENT   PRODUCTION PREPARATION  DEVELOPMENT PREPARATION development of: 1. construction 2. technology 3. organisation & information system 4. new products 5. economics 6. personnel  WORK PREPARATION  MATERIAL 1. production plan preparation PRODUCTION PURCHASING 2. design & construction preparation PROCESS 3. technological preparation 4. operative-workshop preparation   COMERCIAL FINANCIAL DIVISION DIVISION Figure 1st Global model of ship production model in shipbuilding The very important step in order to become competitive on the world shipbuilding market is the implementation a high level of information system technology based on the latest software and hardware technologies. The intention of this paper is to emphasise the potentials and the importance of the Artificial intelligence implementation in the construction of the marine ship engine through developing a prototype of one expert engine diagnostic tool. The study analyses objectives with methods of artificial intelligence (forward chaining, flow control, frames and instances code, graphic toolkit, etc.). A computer program (the prototype application of one expert engine diagnostic tool) must bee developed to solve the problem and to define basic rules, relations and functions. The lattice for the developed prototype application is general model for engine, components and basic parts (oiler, pump, piston and combustion chamber). Generated code can be transparent for all processes of development similar diagnostic tools in marine shipbuilding. Such analyses contribute to the reliability of diagrammatic-analytical methods and to the control of all significant engine parts or components (critical or non-critical). 2. INFORMATION SYSTEM AND EXPERT SYSTEMS SOLUTIONS IN MARINE SHIPBUILDING All analyses shows that development and application of various programs, combining the conventional software solutions with expert systems solutions, in specific parts of the ship construction process would be very useful. Integration of these solutions does that the entire production and construction in marine shipbuilding process be rendered more efficient. One of the most significant stage of all stages of the global ship construction process is ship engine manufacture and assembly (Figure 2nd).  Figure 2nd Stages of the global ship construction process The conventional information systems have been primarily developed with the aim of enabling and facilitating the follow-up of business activities, whether the activities of a shipbuilding production unit or of a non-production unit. The economic reasoning advocates the development of the information systems on the basis of the methodology of systems analysis, which has been approved in practice for its results. The continued development of information system brought about such systems whose primary target was to improve the decision-making process in shipbuilding and in servicing all vitally parts of one ship. Designing of such information systems enables better decision-making process and results in the improvement of operating effects of this subject. The production process management is the most important and the most complex part of total or integration management process treating the management and production as a complex task. Figure 3rd illustrates the conceptual model of development of automated production system in the shipbuilding organisation.  Figure 3rd The conceptual model of development of automated production system in one shipbuilding organisation The development of the contemporary management tends to attain the following goals: (1) modernisation of production process technology through implementation of numerical control technology; (2) introduction of highly-automated and flexible production in some segments the production process; (3) design of the contemporary flexible integrated information system for the shipbuilding production process; (4) spreading and wide use of computer system in the field of production preparation; (5) elaboration of the entire product development in the ship construction process by its segments and phases together with defining of the common goal. Despite to its complexity, multidisciplinary character and involvement of numerous professional experts in various fields expert systems took place in the field of ship construction process, namely, the production phase. Process of acquisition, systematisation and structuring of knowledge in this complex field is time-consuming, hard and expensive. Expert systems could significantly improve not only the production process but also the whole ship construction process. Especially, expert systems could significantly improve functioning and maintenance of ship engine. 3. STRUCTURE OF EXPERT SYSTEM IN MARINE SHIPBUILDING The most promising field of Artificial intelligence (AI), expert systems, are more widely applied in practice of marine shipbuilding. Expert systems represents intelligent computer programs accomplished by means of various AI methods, which can solve domain problems with logical conclusion making and by utilisation of comprehensive knowledge, primary from the field of application. A typical expert system structure in marine shipbuilding has been schematically represent in Figure 4th.   K N O W L E D G E B A S I S    CONCLUSION MAKING MECHANISM USER  INTERFACE  USER in marine   Knowledge Explanation acquisition module module  Experts in marine shipbuilding technology Figure 4th A typical expert system structure in marine shipbuilding Expert systems (ES) in marine shipbuilding could improve the whole ship construction process, production process and functioning and maintenance of vitally parts of one ship (like ship navigation equipment, ship engine, etc.). ES could be diagnostic tools for better functioning and on-time maintenance of ship engine and various vitally equipment of one ship, etc. ES in marine shipbuilding must know the best way how to explain to the user their manner of making conclusions, their problem solving manner and techniques (procedures of reaching the relevant facts and used knowledge in some specific procedure). They must provide conclusions even on the basis of uncertainty, or uncompleted and unreliable data (like human experts). Architecture of ES in marine shipbuilding is subject to constant investigation and new improvements, depends on the domain of field application. The knowledge basis contains expert knowledge on the specific marine subject area usually in the forms of: facts, rules (generally known and accepted knowledge), heuristic (experiences and basic knowledge of experts and methods of conclusion and decision making based on that knowledge or on fuzzy logic and uncertainty). Besides the conclusion making mechanism of ES in marine shipbuilding, the knowledge basis represents one of the most important part of ES. Quality of knowledge basis of some ES mostly represents the quality of whole ES. Also, building a knowledge basis of ES is too often the most time-consuming and the hardest phase of building ES. 4. KNOWLEDGE BASIS, KNOWLEDGE AQUISITION AND REPRESENTATION IN DEVELOPING A PROTOTYPE OF ONE EXPERT ENGINE DIAGNOSTIC TOOL IN MARINE SHIPBUILDING The expert engine diagnostic tool (EEDT) in marine shipbuilding has purpose to shut down an engine if one of its critically or linked together components needs to be shut down. In this stage of development of the EEDT only two basic problems can cause a component to shut down: overheating and low oil. As change of the values on the dials and gauges (which represents, in the graphic interface, the actual oil level and temperature level of a component and the whole engine) happens the ES interprets as interaction of the component of the engine. Knowledge basis of EEDT contains (in the forms of: facts, rules and heuristic) all knowledge about several basic components of marine engine. The engine is schematically and basically made of: fuel pumps, oil pumps, cylinders, cylinder oiler, pistons, combustion chambers. The vitally engine parts are related as shown in Figure 5th.  FUEL PUMP COMBUSTION CHAMBER 2   PISTON 2   OIL PUMP CYLINDER OILER PISTON 1 COMBUSTION CHAMBER 1 Figure 5th Relations of vitally engine parts from basic aspect of EEDT Only cylinder oiler is the critical engine component from the aspect of engine integrity, good functioning and on-time maintenance. All other parts are auxiliary, from the same aspect. The engine has critical and non-critical component. Basic rule can be explained in fact that if any of the critical components is forced to shot down, the engine must be shut down. Also, because the relations between the components and because that they are linked together, a problem in one component can be escalated in the component it feeds. Example in EEDT is: when a low amount of oil in cylinder oilers oil pump causes low level of pistons cylinder oiler the piston can be shut down. That also means that shutting down a non-critical component can ultimately cause the engine to be shot down. Example in EEDT is: when a fault in the oil pump, which is non-critical component of engine, cause that the piston be shot down, thus causing the engine to be shut down. All above is maiden by functioning the rules, which shut down the engine if a component has to be shot down. EEDT uses a set of forward rules to look at the values in the slots of the engine for temperature and amount. This prototype of EEDT in marine shipbuilding can be developed with all relevant rules which can detect and prevent all possible problems, not only low oil amount (a leaking oil line) and overheating of engine components. Developed application prototype of EEDT has six basic rules, one user-defined relation and one user-defined sponsor. Because of explaining these relations, sponsors and rules, top frame or the application lattice for developed EEDT application must be explained and shown (like in Figure 6th).   COMPONENT MACHINE OILER slot: slot: slot: on-critical path operating-temperature nozzle shutdown pressure  maintenance PUMP repair-procedure slot: upstream oil-amount downstream oil-lines TOP-FRAME  PISTON slot:  surface  ENGINE  slot: COMBUSTION-  shutdown -CHAMBER Figure 6th The expert engine diagnostic tool (EEDT) application lattice (top-frame) The EEDT application has basically two top-level frames: component and engine. The component frame is used to represent the vital components of the engine. The engine frame is used to represent the engine being diagnosed, also has only one slot and there is one instance of engine: engine-1. The component frame has the six slots, and there are no instances of component. On-critical-path slot has purpose to indicate whether or not the engine component is on the critical path, and that indicates with value of either :yes or :no. When a component is on the critical path, a fault in the component will cause a shutdown of the engine. If it is not, a fault can only cause the component to shot down without causing the engine to shut down. Shutdown slot has purpose to indicate when one component must be turned off. It is globally accepted that it hold one of the following values :unneeded, :soon or :immediately. If the value is :unneeded, the component continues running. If the value is :soon, the component is shut down for maintenance according to a maintenance schedule. If the value is :immediately, the component is shut down and the diagnostic rules find a right solution for that problem. Maintenance slot has purpose to indicate when a component needs to be worked on as part of regular maintenance schedule. The value is :unneeded, :soon or :immediately. Repair-procedure slot has purpose to hold instructions for repairing the component when it is faulty. Upstream slot has purpose to indicate which components feed into this component. An example from EEDT, an outlet valve might have the instance fuel-pump in its upstream slot. The slot is multivalued, and is constrained to be an instance that inherits from the component frame. Downstream slot has purpose to indicate which components are fed by this component. For example, a piston might have an instance of combustion-chamber in this slot. The slot is multivalued, and is constrained to be an instance that inherits from the component frame. Shutdown is one slot of engine frame and has purpose to hold one of the following values :unneeded, :soon or :immediately. If the value is :unneeded, the engine continues running. If the value is :soon, the engine is shut down for maintenance according to a maintenance schedule. If the value is :immediately, the engine is shut down and the diagnostic rules find a right solution for that problem. Machine frame inherit from component frame. The machine frame has two local slots. Four frames inherit from machine. Operating-temperature slot indicates the temperature of the machine. This slots value is one of :low, :normal or :high. If the temperature gets too high, a shutdown of the component can occur. Pressure slot indicates the pressure of the machine. This slots value is one of :low, :normal or :high. If the pressure gets too high, the component can be shut down. The oiler frame has a local slot called nozzle, which is used to indicate if the nozzle is clogged. The slot can have a value of :open or :clogged. There is one instance of oiler: cylinder-oiler. The pump frame has two local slots and has two instances: fuel-pump and oil-pump. Oil-amount slot has purpose to indicate when the oil amount gets too low. This causes a shutdown can occur. This slot can have value :low, :normal or :high. Oil-lines slot can have value of :leaking, or :intact. A leaky oil line can be the source of a low oil pressure problem. The piston frame has a local slot called surface, which is used to indicate condition of the surface of the piston. The slot can have a value of :smooth, :chipped or :gouged. There are two instances of piston frame: piston-1 and piston-2. The combustion-chamber frame has no local slots. There are two instances of combustion-chamber: combustion-chamber-1 and combustion-chamber-2. Knowledge acquisition process can be performed in one of following ways: (1.) manually, through participation of knowledge engineers (by consulting the domain experts, literature and other relevant sources); (2.) manually without participation of knowledge engineers; (3.) through machine learning process. In this case knowledge acquisition process was performed in the first (1.) of explained way, because the software modules for acquisition of knowledge in this particular domain have not been developed so far. The knowledge representation schemes needs a good choice of appropriate structuring techniques and the quality and consistency of the knowledge basis. In some cases the three-level semantic nets can be used, with the following type: objects - attribute - value (like in Figure 7th).  OBJECT    attribute 1 attribute 2 . . . . . . attribute n   value of value of value of attribute 1 attribute 2 . . . . . . attribute n Figure 7th The three-level semantic nets Graphic interface object of developed prototype of the EEDT consists of one screen layout with one canvas and several images, in forms of gauges and dials. The images are attached to the canvas operator-panel, which is attached to the screen layout diagnostic-screen-layout. There are two sets of gauges and dials: one set for the oil pump and the other set for the fuel pump. Oil-pump gauges and dials are: - Oil-Oil-amt gauge, that shows the value in the oil-amount slot of the oil-pump instance, and is selectable, so that its value can be changed. When change of the value happens, the EEDT system forward chains to change the values of other images on the operator-panel. A gauge has indicators: high, normal and low. - Oil-Line-status gauge, that shows the value in the oil-lines slot of the oil-pump, and is selectable, so that its value can be changed. When change of the value happens, the EEDT system forward chains to change the values of other images on the operator-panel. A gauge has indicators: leaking and intact. - Oil-Operating-temp dial, that shows the value in the operating-temperature slot of the oil-pump, and is selectable, so that its value can be changed. When change of the value happens, the EEDT system forward chains to change the values of other images on the operator-panel. A dial has indicators: high, normal and low. - Oil-Maintenance-status gauge, that shows the value in the maintenance slot of the oil-pump, and is not selectable. When change of the oil amount and operating temperature of the oil pump happens, the value of this image is changed to reflects explained changes. A gauge has indicators: immediately, soon and unneeded. - Oil-Shutdown-status gauge, that shows the value in the shutdown slot of the oil-pump, and is not selectable. When change of the oil amount of operating temperature of the oil pump happens, the value of this image is changed to reflects this changes. A gauge has indicators: immediately, soon and unneeded. Fuel-pump gauges and dials are: - Fuel-Oil-amt gauge, that shows the value in the oil-amount slot of the fuel-pump instance, and is selectable, so that its value can be changed. When change of the value happens, the EEDT system forward chains to change the values of other images on the operator-panel. A gauge has indicators: high, normal and low. - Fuel-Line-status gauge, that shows the value in the oil-lines slot of the fuel-pump, and is selectable, so that its value can be changed. When change of the value happens, the EEDT system forward chains to change the values of other images on the operator-panel. A gauge has indicators: leaking and intact. - Fuel-Operating-temp dial, that shows the value in the operating-temperature slot of the fuel-pump, and is selectable, so that its value can be changed. When change of the value happens, the EEDT system forward chains to change the values of other images on the operator-panel. A dial has indicators: high, normal and low. - Fuel-Maintenance-status gauge, that shows the value in the maintenance slot of the fuel-pump, and is not selectable. When change of the oil amount and operating temperature of the fuel pump happens, the value of this image is changed to reflects explained changes. A gauge has indicators: immediately, soon and unneeded. - Fuel-Shutdown-status gauge, that shows the value in the shutdown slot of the fuel-pump, and is not selectable. When change of the oil amount of operating temperature of the fuel pump happens, the value of this image is changed to reflects this changes. A gauge has indicators: immediately, soon and unneeded. Engine-shutdown(status) image, in fact gauge, is used to show the value of the shutdown slot of the engine-1 instance. It is not selectable, but its value is changed with changing the value of the oil amount and operation temperature images for oil-pump and fuel-pump. When the engine needs to be shut down, the value of this gauge changes to :immediately. This gauge has indicators: immediately, soon and unneeded. For example, if happens change of the value on the oil-oil-amt gauge to low, the oil maintenance, oil shutdown and engine shutdown gauge values all change to soon if their previous values were unneeded. That means because of the oil amount in the oil pump is low, shutdown and the maintenance will be required for the oil pump and the entire engine soon, if not immediately. In addition, if the oil-line gauge is changed to leaking, shutdown of related components is immediately. Application prototype of EEDT has six basic rules, one relation and one sponsor, which are explained, in brief: - The relation PROVIDES is used to link components to supporting components in their upstream slots, and it is an assertion relation that takes as its arguments the substance (such as pressure), the source, which is the upstream component, and the destination, which is the current component. In brief, this relation links components with the ones that feed them. Three assertions are made, in form of various expressions, from above relation, and they are used by the auxiliary-shutdown rule. - The SHUTDOWN-SPONSOR sponsor is used to allocate resources to all the forward rules that determine the shutdown. In brief, this sponsor controls all forward-chaining shutdown rules. When developed prototype of EEDT be expanded there would be many sets of rules, and sponsors could turn on and off the entire parts of engines or machinery. - The low-oil-no-leak rule fires when a pump with low amount of oil does not have a leaking oil line or immediate maintenance already flagged. Then rule puts the value :soon in the maintenance slot, but not value :immediately because the oil lines are not leaking. In brief, this rule means that if oil is low but no leak, that is not very serious problem. - The low-oil-and-leaking rule fires when a pump with low amount of oil have a leaking oil line. Then rule asserts the value :immediately into the maintenance slot. In brief, this rule means that if oil is low and still leaking, that is a serious problem. - The hot-pump rule fires when there is a pump with high operating temperature. Then rule asserts the value :immediately into the maintenance slot. In brief, this rule means that an overheated pump can quickly be permanently damaged. - The auxiliary-shutdown rule fires immediately when there is a component that has a shutdown value and feeds into another component. The provides relation is used to determine which component it affects. Then rule asserts the value in the first components shutdown slot into the fed components shutdown slot, what causes that when the first component does shut down, the component that it feeds will also be shut down. In brief, this rule means that when an auxiliary component goes down, the supported component goes down, too. - The maintenance-shutdown rule fires when there is a component that has a value in its maintenance. Then rule asserts the value in the maintenance slot into the shutdown slot of the component. Thus, when a component is scheduled for maintenance, it will have a shutdown value consistent with this. In brief, this rule means that maintenance work forces a shutdown. - The engine-shutdown rule shuts down the engine. The rule fires when a component has a value :yes in the on-critical-path slot and has some value in the shutdown slot. Then rule puts the value in the shutdown slot of the engine. Thus, if any component that is critical to the running of the engine needs to be shut down, the entire engine is shut down. Also, if the shutdown slot of critical component is set to :unneeded, the rule will still fire, and the value in the shutdown slot of engine-1 will be :unneeded. In brief, this rule means that shutting down a critical component shuts down the line. 5. CONCLUSION The prototype of EEDT must have only basic rules and because of that completing application needs further analysing, detecting and adding new rules to solve all possible problems of a engine in marine shipbuilding. Based on the explained above, further development for the shipbuilding industry can be predicted. Concurrently with the predicted development of computerised information systems and AI it will be necessary, for the shipbuilding industry, to resolve the organisational problems and to adopt new technologies, like expert systems, other AI techniques, etc. This work explained some practical possibilities and right ways to develop a prototype of one expert engine diagnostic tool in marine shipbuilding and how to go further in similar researching. 6. REFERENCES Brule, F., Blount, A., Knowledge Acguisition, McGraw-Hill, 1989. Charniak, E., McDermont, D., Introduction to Artificial Intelligence, Addison-Wesley, 1985. OShea, T., Eisenstadt, M., Artificial Intelligence - Tools, Techniques and Applications, Harper & Row, 1984. Rich, K. M., Robinson, P. R., Using Turbo Prolog - Second Edition, McGraw-Hill, 1988. `imundi, S., Jaukovi, M., Rami,D., Simone,V.,  Research into Production Preparation Information Systems in Shipbuilding , Proceedings of SIMOPIS, Dubrovnik, 1989. `imundi, S., Munti, A.,  The Knowledge Basis in the Expert System Structure for the Ship Construction Phase , Symposium ELMAR 94, Zadar, 1994., p.p. 304-308. `imundi, S., Munti, A., and Hel, Z.,  An Organisation of Automated Management In the Shipbuilding Process , VII Congress of the International Maritime Association of Mediterranean, IMAM, 1995., p.p. 758-767. `imundi, S.,  A research into segments of the information system design in the special purpose ship production , Proceedings, 7th International symposium, Information systems  96 , Faculty of organisation and information sciences, Vara~din, 1996. ! z? 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