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SMAT2008E11THE MATHEMATICAL SIMULATE AT TRANSIENT STATEOF DIESEL ENGINE FUNCTIONNeculai Iurea* Alexandru Dragalina* Ionel Apostol*Abstract: The river and sea ships are equipped with a complex energetic apparatuses form by many componentswhich interact between in working time. Each of these components has particular static and dynamic properties whichensure optimal function of the engine. The main purpose for mathematical simulate is to provide a highlight analyticalway of some difficult aspect specific for diesel engine function. At the same time, mathematics is putting at thescientist’s hand methods of analyze to give a strong explanation of the causes and effects of the less known aspects ofthe diesel engine exploitation. The mathematical simulate is based on existence of some similarities between the studyof two objects. If between these two objects we can establish at least one similarity-then we can say there is a relationbetween the real system and his model. The function in transient state of speeding of the diesel engines, made for shippropulsion, knows at least three directions:• the engine function simulate, through a thermodynamically research inside of the engine cylinder;• the engine function simulate, through an automatically system research;• the engine function simulate, through an engine and his equipment dynamic research.Keywords: naval diesel engine, energy, energy balance, transient state of speeding, mathematicalsimulate/design, controlling system, electromechanical action, dynamic, effectiveness, function of transfer.• Neculai Iurea, commander drd eng.., The School of Naval Petty Officers „Admiral IonMurgescu”, Constanta, Dezrobirii no.80, tel.0241655650, int.0248, e-mailiureaneculai@yahoo.com;• Alexandru Dragalina, captain prof.ph.d.eng., the Naval Academy “Mircea the Elder”,Constanta, Fulgerului no.1, tel.0241626200, int.1211, e-mail dradid@seanet.ro;• Ionel Apostol, drd. eng., the “Transilvania” University, Braşov, tel. 0268413000, int.173, e-mail ionelapostol@gmail.comSMAT2008E16THE ANALYSE OF THE COMMAND SYSTEM FOR ADAPTIVEADMISSION IN INSERTION PROCESS OF FUNCTIONING AT HEATENGINESMarinică STAN, Dinel POPAAbstract: The paper presents aspects concerning the calculus of the feeding time of the command system, and thecalculus of the displacement period of the piston at an insertion process of functioning.Keywords: command system, engines, adaptive admission, piston, hydraulic.Marinică STAN, Prof. PhD. Eng., University of Piteşti, Applied Mechanics Department, e-mailstan_mrn@yahoo.com, 0248/217736.Dinel POPA, Prof. PhD. Eng., University of Piteşti, Applied Mechanics Department, e-maildinel_popa@yahoo.com, 0248/217736.47