Report 94.3.TT.4349, Transport Engineering and Logistics.
The 'bar grab excavator' is a type of grab that is used in handling bulk
solids. The curve that is travelled by the edge of the grab jaw usually
isn't optimal for the fill ratio of the grab. To prevent the fill ratio
becoming too low, the crane operator lowers the grab head a little by
manipulating the cables. This requires great skill and time to learn.
The programme 'Stangengrijper' calculates the displacements of the cables
necessary to realise an arbitrary digging curve making use of a grab of
dimensions which are free to choose. Both grab dimensions and digging curve
are entered by the user. The digging curve is entered in the shape of ten
different points. The displacements of the cables, which correspond to these
points, are calculated. Output is created by presenting the results as
coordinates and connecting these by means of a line. By doing so one
can get a good impression of the relations that exist between grab geometry,
desired digging curve and cable displacements.
The programme reads input from the keyboard or from file. Output is presented
on the screen (graphics) or is written to a file (numeric output).
The programming language is Turbo Pascal 6.0.
Reports on Transport Engineering and Logistics (in Dutch)
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