Ooi , Lu Ean
(2010)
Dynamic Stiffness Analysis Of Engine Rubber Mounts.
Masters thesis, Universiti Sains Malaysia.
Abstract
Dynamic stiffness and loss factor for engine rubber mount are important dynamic
behaviour to represent the performance of an engine mount system. Damping and
dynamic stiffness measurement play important role in the characterization of
dynamic properties for the engine rubber mount system. Impact test is simple and
powerful measurement technique for damping measurement. The recent development
of impact technique is the application on dynamic driving point stiffness
measurement. In this thesis, the impact technique is further developed for dynamic
transfer stiffness measurement where the impact hammer is used to replace shaker as
the source of excitation in damping measurement. The mathematical formulation and
the experimental procedures to measure dynamic driving point stiffness and dynamic
transfer stiffness for engine rubber mount by using impact test are presented. The
results showed that the dynamic driving point stiffness can only be used to represent
dynamic transfer stiffness for the lower range of frequency. The mass between the
test isolator and the input force transducer will influence this range of frequency. The
loss factor of the engine mount is also estimated in the function of frequency. The
curve fitted function of loss factor (η11) showed linear dependency of the engine
rubber mount system on the frequency and loss factor (η21) showed non-linear
dependent of the resilient element on the frequency. By using this curve fitted loss
factor, the dynamic driving point stiffness and dynamic transfer stiffness are
accurately reproduced and compared to the measured results. The results obtained by
using the impact technique are finally validated with the results obtained by using
shaker.
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