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|Title: ||An investigation into the engagement characteristics of an automotive dry friction clutch|
|Authors: ||Mizon, Richard|
|Issue Date: ||1974|
|Publisher: ||© Richard Mizon|
|Abstract: ||The object of this research was to investigate the period of time
during which the clutch plates of a motor vehicle are engaged to effect
a start from rest. The problem was approached from two sides, firstly
a mathematical model has been produced in the form of a digital computer
program. Secondly, practical investigations were undertaken in order to
shed more light upon certain problem areas highlighted whilst developing
the mathematical model. Finally the two types of investigations were
combined to give a more realistic model of the engagement period than any
that had previously been published.
The mathematical model allowed parametric studies of the clutch to be
made giving details of slip time, speeds, clamp load, friction level,
heat generated and the one dimensional temperature distribution through
one half of the clutch assembly. Two methods for the solution of the
temperature distribution problem were used in order to give a cross
check during the development of the mathematical model. Stability of the
two methods has been investigated and limits suggested which if adhered
to prevent instability errors occurring.
Practical work on a test rig was carried out in order to investigate
the variation of friction levels during the engagement period and also
the temperatures reached. A test vehicle was instrumented to find out how
the general public operated the clutch in service and how their operation
varied with test conditions i.e. gradients and traffic conditions.
Finally a computer controlled test rig comprising of an engine, clutch
with e1ectro-hydraulic ram operation and inertia flywheel was developed.
This rig was completely automatic and could be used to simulate different
engagement rates, gradients and, if inertia were added or subtracted, different vehicles.
The result has been that a useful tool, in the form of an easily
used computer program has been developed, the limitations of which have
been investigated. Also, a test facility has been developed which can
be programmed to simulate in vehicle use. The model and test rig
produced lend themselves to extension to further work in the area of clutch
and transmission vibrations, especially clutch judder.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Aeronautical and Automotive Engineering) |
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