Design of a dynamometer-engine coupling shaft / Mohd Hasnun Arif Hassan
In measuring the power output of an engine, the engine has to be coupled to a load device known as dynamometer. The coupling is done by means of a solid shaft. The proper couplings and shaft are required for the connection to avoid any failure to the engine or the dynamometer. Unsuitable selectio...
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Format: | Thesis |
Published: |
2012
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Online Access: | http://studentsrepo.um.edu.my/8143/4/hasnun.pdf http://studentsrepo.um.edu.my/8143/ |
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Summary: | In measuring the power output of an engine, the engine has to be coupled to a load
device known as dynamometer. The coupling is done by means of a solid shaft. The
proper couplings and shaft are required for the connection to avoid any failure to the
engine or the dynamometer. Unsuitable selection could lead to undesired problems such
as torsional vibrations, vibration of the engine and dynamometer, whirling of the
coupling shaft, damage of the bearings, engine starting problem or immoderate wear of
the shaft line components. The commonly encountered problem is the resonance in
torsional vibration, which results in disastrous failure of the shaft due to excessive
vibration. This project is aimed to study the appropriate design of the shaft to be used in
the dynamometer-engine coupling to prevent the system from undergoing unwanted
problems. The theoretical calculations involve in the design are presented. The
dimension of the coupling shafts for engines with various maximum torques are
estimated. It is shown that the diameter of the shaft is proportional to the maximum
torque of the engine given that the same coupling is used for every system, whereas the
length of the shaft is almost equal for every engine. The diameter of the shaft is a vital
parameter compared to its length. For engines with the maximum torque vary from 40
to 200 Nm, the same shaft length of 500 mm can be used but with increasing shaft
diameter as the maximum torque increases. For a 40 Nm engine, the shaft diameter of
20 mm generated acceptable result. The shaft diameter was increased by 5 mm as the
maximum torque increases and acceptable results were obtained. On the other hand, by
using aluminium instead of steel as the material of the shaft, lower critical engine speed
is obtained given that the same dimension of the shaft is used. This is due to the fact that
aluminium possesses lower modulus of rigidity in comparison to steel. |
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