Results of the Experimental Data Analysis of the Flat Rafting Units Assemblies Acceleration

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634*378.33

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Abstract

Knowledge of specificity of the hydrodynamic and inertial interaction between the flat rafting units lines and a fluid flow during nonstationary current  is necessary for engineering of navigation rafting state-of-the-art technology at small and medium rivers. Research of the inertial moving processes of the units at the various regimes (specifically – during acceleration) is necessary for correct choice of facilities for tugging and transposition of the units and proper design of raft moorages. Besides that, this information allows to increase correctness of the technological and traffic calculations concerning the navigational rafting of the lines. Тhe technique of experimental studies of inertial features (acceleration) of the lines was developed for this.  By the research results, following  dependencies have been derived: instantaneous value of a route, velocity, acceleration, coefficient of nonstationarity, by the time and dimensionless velocity. The nonstationary member of the tractive resistance of the line model, was computed. Taking into account an assumption of the character of resistance, as a shape based one, the coefficient of a resistance transient part, has been designed. The final results of the experimental studies of the lines acceleration are presented in a form of dependence of nonstationarity coefficient, on the geometric characteristics of the FRU lines models. The findings allow to compute the nonstationarity coefficient, which inherently is a function of at least five interdependent values, at any section of a line acceleration, on the base of the features of a line,  combined in a parameter. The formulas for deriving the coefficients, obtained in a dimensionless form, may be applied directly for full-size conditions during towing of the lines at the small and medium shallow rivers.

Authors

D.A. Shtaborov, Teaching Assistant V.A. Barabanov, Candidate of Engineering V.L. Rymashevski, Candidate of Engineering, Associate Professor Northern (Arctic) Federal University named after M.V. Lomonosov Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia E-mail: b.mochalov@narfu.ru g.tutygin@narfu.ru

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov

Keywords

flat rafting units, coefficien оf nоnstаtionary, velocity, acceleration, dimensionless velocity.

References

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