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EXPERIMENTAL
STUDY OF NONLINEAR DYNAMIC CHARACTERISTICS FOR THREE TYPES OF HYDRAULIC
ENGINE MOUNES AND PARAMETERS
IDENTIFICATION METHOD
FAN Ranglin LÜ Zhenhua
(State
Key Laboratory of Automotive Safety and Energy, Tsinghua University,
Beijing 100084)
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Abstract: Hydraulic
engine mount (HEM) has the best performance among the passive engine
mounts and is the first option for design of mounts for vibration
isolation of powerplant. Based on the third generation of HEM, which has
three types of hydraulic mechanisms such as the inertia track, the
decoupler and the disturbing plate, some changes of the inertia track
are made or the hydraulic mechanisms are organized again, then the
influences of the hydraulic mechanisms, the length of the inertia track
and the local loss of fluid flow at the entrance of the inertia track to
the dynamic characteristics of HEM are experimentally studied, the
working principle of the three types of hydraulic mechanisms and the
relationship between the three types of HEMs are revealed clearly. These
results will be helpful for the selection of the design scheme of HEM,
and the lumped parameters model of HEM and its analytical conclusions
are proved to be correct. Based on the fact that the experimental
results and the analytical results are matched well and according to the
lines’ shape of the dynamics stiffness in phase as a function of the
excited frequency and amplitudes, a new parameter identification method
for the bulk stiffness of the upper chamber and the effective pump area
of the main rubber is presented, which is clear in principle and the
identified results are reliable because it is not sensitive to the error
of measurement. The new method is time and cost saving because the test
can be done on a conventional elastomer test system and there is no need
to design a new hydraulic measurement setup.
Key
words: Hydraulic
engine mount Dynamic characteristics Parameter identification
Powerplant Vibration isolation
CLC No: U464.1
TB123 TH113
教育部博士点科研基金(98000321)和清华大学基础研究基金资助项目. Received 20050507,
received in revised form 20051025
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