In this paper, a 3-D, dynamic, non-linear Finite Element (FE) model of gutter brushes for street sweeping was described and used to obtain a coefficient of friction curve as a function of the bristle tip sliding velocity for flicking brush-concrete contact. The model was also utilized to determine appropriate brush penetration ranges as a function of debris height for cutting and F128 brushes. The model entails a transient analysis involving contact. The brushes comprise two rows of clusters. Each of which was modelled by a beam with quadratic FE beam elements. These elements were subjected to inertial forces, and the road surface was rotated and raised until the required penetration was achieved. Average values of the coefficients of frictions were determined for three brush rotational speeds: 60, 100 and 140 rpm. Experimental results in the literature, for a horizontal flicking brush rotating against a concrete test bed, were used to obtain the coefficient of friction for each brush speed. The correlation between the experimental results and FE results suggests that the model derived is valid. It has been demonstrated that the coefficient of friction has a profound effect on the brush vertical force of a flicking brush, but it does not significantly affect the vertical force of a cutting brush. In addition, it was concluded that the coefficient of friction depends on the bristle tip sliding velocity. The results were fitted to an exponential equation for the flicking brush. Furthermore, the model was applied to obtain the brush contact arc as a function of brush penetration for a number of angles of attack. Also, suitable ranges of brush penetration, as a function of the debris height, are suggested from the FE results for a set of angles of attack. With these ranges, the brush works with an appropriate contact arc, and backward sweeping is avoided. These results will be used for further work.


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    Titel :

    Determination of friction coefficients, brush contact arcs and brush penetrations for gutter brush-road interaction through FEM


    Beteiligte:

    Erschienen in:

    Acta Mechanica ; 221 , 1/2 ; 119-132


    Erscheinungsdatum :

    2011


    Format / Umfang :

    14 Seiten, 17 Bilder, 3 Tabellen, 47 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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