Research On Theoretical Calculation And Simulation For The Maneuerability Of Abnormal Ship Model

Since the reformation and opening in China, the national river transportationconstruction are growing rapidly, port and waterway transportation ability gainedgreater increase, the water transportation as a modern transportation recognized greentransportation push the development of national economy.But there was an importanttechnical problem restricted the application of navigation model ships remained to besolved that was the technology of navigation model ships using abnormal hydraulicmodel. Because of the limited by topography, most of the hydraulic models wereabnormal, that was the scale of vertical and horizontal was not accordance. In the pastthe research of navigation ship models were used to research the navigation problem ofnormal hydraulic model using normal ship models which caused the application of thetechnology of the navigation ship models has be very limited. In the foreign country, theabnormal hydraulic ship models have been used in the experiment, but the experimentrelatively rough and researched superficially. If can break the abnormal conditionhydraulic model using the navigation ship model technology, the application range ofthe navigation ship model would greatly expand,and could avoid spending a lot moneyto build normal hydraulic model in the test. Abnormal ship model technology canservices navigation.In addition, because of the experimental study of the geometric abnormal conditionship model was very few, the research abnormal ship model has many technicalproblems in theory and practical application which was limited the application of themodel test study in the abnormal condition of flow.Therefore, with the development ofcomputer science and technology of dynamic of ship, it was urgent to develop extensivestudy of the applicability of ship model of abnormal condition of hydraulic ship modeland found the internal relation of the various elements of ship model with the conditionsof abnormal water flow to made sure that ship model technology service for navigationresearch.This paper based on the basic similar theory, discusses the maneuerabilitysimilarity of abnormal model. According to the similarity of the abnormal ship model,we establish abnormal ship model equations of motion. This paper bases on experienceformula of former Soviet union to compiling calculational program, which predictszigzag manoeuvre of small abnormal rate ship model, in addition get the manoeuvre similarity of abnormal ship model. The computer simulation experiment shows obviousship model Scale Effect, make abnormal ship model and ship only to satisfy certainconditions similar.In the calculation of the steady turning stage of abnormal ship model, a conclusionthat changes in the rate η>2as the rate of change of turning diameter also increaseswith the increase. This shows that abnormal condition of ship model turning and ship issimilar. In hydraulic model abnormal ship model can be used as the ship’s realinversion.