Developing methods for determining technical and exploitation parameters of pushboats and pushed convoys

Kretanje potiskivanog sklopa/sastava je njegova sposobnost da se premešta nekom brzinom usled delovanja određene sile koja mu je pridodata.Ovu silu stvaraju brodski propeleri i pri zadatoj brzini v=const ona treba da bude jednaka sili otpora sredine-vode i vazduha.Iz tog razloga korisna sila koju razvijaju propeleri broda-potiskivača pri plovidbi sa sastavom potisnica pri v=const treba da savlada ne samo otpor svih potisnica u sastavu već i sopstveni otpor broda. Za planere procesa vodnog prevoženja neophodno je, osim poznavanja veličine otpora sredine pri plovidbi potiskivanih sklopova i poznavanje redukovanih i specifičnih otpora pojedinih tipova potiskivanih teretnjaka i sastva koje oni čine. Osim toga, predložene su metode za proračun očekivanih brzina plovidbe u mirnoj vodi i očekivanih vrednosti pokazatelja statičkog opterećenja utvrđenih na osnovu obavljenih eksperimenata po pojedinim tipovima brodova i potiskivanih sastva. Takođe, predloženi su novi tehnički i eksploatacioni pokazatelji za ocenu ispravnosti rada potiskivača, koji do sada nisu primenjivani u Srbiji. Na kraju disertacije prikazane su metode kojima se rešavaju praktični zadaci prevoženja po različitimh brodovima potiskivačima i potiskivanim sastavima.Movement of convoy/pushed convoy is its ability to change place due to certain force that drives it. This force is created by ship’s propellers for given speed v=const and it should be equal to resistance of surrounding water and air. This is the reason why useful force created by ships propellers (thrust) created by propellers of pushboat while navigating with a convoy at v=const needs to overcome not only the resistance of barges but push-boat’s resistance as well. For planers of transport process it is necessary to know, besides the resistance of surroundings during navigation of pushed convoys, the value of reduced and specific resistance for certain types of barges and convoys that they form. Apart from that methods for calculation of expected speeds of navigation, value of static load of engines based on experimental research. Besides that new exploitation parameters for determination of push-boat’s work are proposed, which haven’t been used in Serbia. At the end dissertation presents methods to solve practical transportation tasks for different ships with different convoys