This dissertation is a practical investigation into the
magnitude of the vertical and lateral forces exerted,
by electric overhead travelling cranes, on their
supporting structures during operation.
The method of measuring the forces and the equipment
used for the actual measurements are discussed, as well
as the equipment used for the processing of the
recoided date.
The forces measured during the experiments, executed in
two stages namely controlled conditions and normal
operation, are discussed under the headings of vertical
forces due to the weight of the crane and lead handled,
and the lateral forces due to cross travel movement,
skewing of the crane and acceleration/deceleration of
the crane.
It is shown that the vertical misalignment of the
rails, together with the stiffness of the crane
structure, has a large influence on the magnitude of
the vertical forces.
Drive wheel slip, tested under controlled conditions on
two E-type cranes, proved to cause high lateral forces.
Comparisons are made with the existing Codes of
Practice as well as with the theoretical models
of crane behaviour.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/16636 |
| Date | 20 January 2015 |
| Creators | Engelbrecht, S.W.H. |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
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