Using Transmissibility And Vibration Power Flow Methods To Evaluate The Effectiveness Of Elastomeric Mounts For Vibration And Noise Control
This paper presents the results of an experimental evaluation of elastomeric mounts used to isolate vibration from a block (representing a powertrain) to a structure test rig (representing a vehicle structure). Four types of elastomeric mounts were considered, where three of them are from gr...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en |
| Published: |
International Institute of Acoustics and Vibration
2014
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/13673/1/ICSV21_Full_paper.pdf http://eprints.utem.edu.my/id/eprint/13673/ |
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| Summary: | This paper presents the results of an experimental evaluation of elastomeric mounts used to
isolate vibration from a block (representing a powertrain) to a structure test rig (representing
a vehicle structure). Four types of elastomeric mounts were considered, where three of them
are from green material natural rubber (SMR CV60, ENR50 and DPNR) and one from
petroleum based synthetic rubber (EPDM). Measurement of the dynamic stiffness and loss
factor of these elastomers were initially performed. Dynamic stiffness and loss factor were
measured in the axial direction for a range of frequency between 5 Hz and 150 Hz at with a
dynamic amplitude of 0.2 mm (p-p). Shaker excitation using random vibration signal in the
frequency range of 10 Hz to 150 Hz at constant force magnitude was applied to the block in
order to quantity the effectiveness of the elastomeric mounts. Measured vibration amplitudes
in the axial direction on both sides of each mount were used to calculate the transmissibility
and vibration power flow. Sound radiation from a plate attached to the structure test rig was
also measured to evaluate the elastomeric mounts contribution to structure-borne noise. The
results from transmissibility showed that vibration was high on EPDM, particularly in the
ranges 25 to 35 Hz, 60 to 80 Hz and 100 to 120 Hz. ENR50 ability to reduce or damped the
amplitude at resonance was found to be the best as compared to the other elastomers. The to-
tal vibration power flow was observed to be highest on ENR50 followed by EPDM. The high
transmissibility on EPDM was due to its high dynamic stiffness and low loss factor. The
larger total vibration power flow on ENR50 was attributed to its high dynamic stiffness and
high loss factor. |
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