Tribological Phenomenon for Advanced Diesel Engines - Engine Modeling
Agency / Branch:
DOD / ARMY
This proposal comprises research efforts to study a dynamic non-stationary friction regime with a variable range of external factors or parameters. This research method considers the development of special non-linear mathematical models for enginetribology including the lubricating oil film thickness as a function of a series of independent parameters in extreme working conditions. These modeling equations will be used collectively to model friction in an advance military diesel engine. Thiscomplete engine friction model will be flexible enough to allow incorporation of other bearing, ring pack, parasitic component or other tribology phenomenon source. In the Phase I effort, we validated the tribology phenomena modeling equations for thepiston ring cylinder liner interface by a laboratory bench test rig. This rig has now become a powerful research tool. In this proposed Phase II effort, the diesel engine tribo-phenomenon source will now be validated by full scale advanced militarydiesel engine fully instrumented with state of the art sensors and measuring equipment. Such a validation will represent a more accurate computer model. It will serve as an analytical modeling tool that can either stand alone, or be implemented into adiesel cycle simulator to show what effect frictional variations will have upon diesel engine performance. We anticipate bi-lateral contributions with the Massachusetts Institute of Technology's Sloan Automotive Laboratory to provide state of the artinstrumentation advice, model refinement and demostrate the works usefulness not only to the Defense Department, but also to industry. The possibility of working with MIT's Consortium to further this work also exists. Prediction of the effect tribologicalevents have on overall engine performance is an area of interest for high output mobile diesel powerplants. The effect of friction and wear is critical to the optimization of the performance of high BMEP diesel engines, their hardware reliability and lifeexpectancy predictions. The development of an engine model into a user friendly interactive PC based model is a great tool and asset to any engine manufacturer or performance minded engine builder. The modeling of tribological phenomena In this workcould be transferred to commercial diesel engines operating in similar modes. This would provide the opportunity to expand computer modeling capabilities in other design and developmental hardware areas. These areas would not necessarily have to be inthe internal combustion engine field as tribology is a phenomenon incurred in virtually any machine design application.
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