Improving the Exploitation of Fluid in Elastomeric Polymeric Isolator
Elastomeric polymer foam has been used widely in
the automotive industry, especially for isolating unwanted vibrations.
Such material is able to absorb unwanted vibration due to its
combination of elastic and viscous properties. However, the ‘creep
effect’, poor stress distribution and susceptibility to high
temperatures are the main disadvantages of such a system.
In this study, improvements in the performance of elastomeric
foam as a vibration isolator were investigated using the concept of
Foam Filled Fluid (FFFluid). In FFFluid devices, the foam takes the
form of capsule shapes, and is mixed with viscous fluid, while the
mixture is contained in a closed vessel. When the FFFluid isolator is
affected by vibrations, energy is absorbed, due to the elastic strain of
the foam. As the foam is compressed, there is also movement of the
fluid, which contributes to further energy absorption as the fluid
shears. Also, and dependent on the design adopted, the packaging
could also attenuate vibration through energy absorption via friction
and/or elastic strain.
The present study focuses on the advantages of the FFFluid
concept over the dry polymeric foam in the role of vibration isolation.
This comparative study between the performance of dry foam and the
FFFluid was made according to experimental procedures. The paper
concludes by evaluating the performance of the FFFluid isolator in
the suspension system of a light vehicle. One outcome of this
research is that the FFFluid may preferable over elastomer isolators
in certain applications, as it enables a reduction in the effects of high
temperatures and of ‘creep effects’, thereby increasing the reliability
and load distribution. The stiffness coefficient of the system has
increased about 60% by using an FFFluid sample. The technology
represented by the FFFluid is therefore considered by this research
suitable for application in the suspension system of a light vehicle.
[1] Moshrefi-Torbati, M., et al., Novel active and passive anti-vibration
mountings. Journal of Sound and Vibration, 2012. 331(7): p. 1532-1541.
[2] Yu, Y., N.G. Naganathan, and R.V. Dukkipati, A literature review of
automotive vehicle engine mounting systems. Mechanism and Machine
Theory, 2001. 36(1): p. 123-142.
[3] Tsang, H.-H., Seismic isolation by rubber–soil mixtures for developing
countries. Earthquake Engineering & Structural Dynamics, 2008. 37(2):
p. 283-303.
[4] Naeim F, K.J., Design of seismic isolated structures. 1999, New York:
Wiley.
[5] Cardone, D., G. Gesualdi, and D. Nigro, Effects of air temperature on
the cyclic behavior of elastomeric seismic isolators. Bulletin of
Earthquake Engineering, 2011. 9(4): p. 1227-1255.
[6] Nunney, M., Light and Heavy Vehicle Technology, Fourth Edition.
Second edition ed. 1992: Butterworth-Heinemann Ltd.
[7] Harris. C.M. and A. Piersol., eds. Harris’ shock and vibration handbook.
Fifth Edition ed. 2002, McGRAW-HILL.
[8] Courtney, W.A. and S.O. Oyadiji, Characteristics and potential
applications of a novel shock absorbing elastomeric composite for
enhanced crashworthiness. International Journal of Crashworthiness,
2000. 5(4): p. 469-490.
[9] Davies, H.C., Development of a novel material for improved crash
energy management in collisions involving vulnerable road users.
International Journal of Crashworthiness, 2011. 16(4): p. 343-350. [10] Elderrat, H., H. Davies, and E. Brousseau, Investigation of the Foam
Filled Fluid Technology for Anti-Vibration Devices. International
Journal of Structural Analysis & Design – IJSAD, 2014. 1(3): p. 182-
187.
[11] Meyers, M. and K. Chawla, Mechanical Behavior of Materials. 2 ed.
2009: Cambridge University Press.
[12] Gibson, L.J. and M.F. Ashby, Cellular Solids: structure and properties.
Second edition ed. 1997: Cambridge University Press.
[13] Service, C.R.a.d.i., Optimized Structural Components and Add-ons to
Improve Passive Safety in New Electric Light Trucks and Vans
(ELTVs) 2011, UNIZAR.
[1] Moshrefi-Torbati, M., et al., Novel active and passive anti-vibration
mountings. Journal of Sound and Vibration, 2012. 331(7): p. 1532-1541.
[2] Yu, Y., N.G. Naganathan, and R.V. Dukkipati, A literature review of
automotive vehicle engine mounting systems. Mechanism and Machine
Theory, 2001. 36(1): p. 123-142.
[3] Tsang, H.-H., Seismic isolation by rubber–soil mixtures for developing
countries. Earthquake Engineering & Structural Dynamics, 2008. 37(2):
p. 283-303.
[4] Naeim F, K.J., Design of seismic isolated structures. 1999, New York:
Wiley.
[5] Cardone, D., G. Gesualdi, and D. Nigro, Effects of air temperature on
the cyclic behavior of elastomeric seismic isolators. Bulletin of
Earthquake Engineering, 2011. 9(4): p. 1227-1255.
[6] Nunney, M., Light and Heavy Vehicle Technology, Fourth Edition.
Second edition ed. 1992: Butterworth-Heinemann Ltd.
[7] Harris. C.M. and A. Piersol., eds. Harris’ shock and vibration handbook.
Fifth Edition ed. 2002, McGRAW-HILL.
[8] Courtney, W.A. and S.O. Oyadiji, Characteristics and potential
applications of a novel shock absorbing elastomeric composite for
enhanced crashworthiness. International Journal of Crashworthiness,
2000. 5(4): p. 469-490.
[9] Davies, H.C., Development of a novel material for improved crash
energy management in collisions involving vulnerable road users.
International Journal of Crashworthiness, 2011. 16(4): p. 343-350. [10] Elderrat, H., H. Davies, and E. Brousseau, Investigation of the Foam
Filled Fluid Technology for Anti-Vibration Devices. International
Journal of Structural Analysis & Design – IJSAD, 2014. 1(3): p. 182-
187.
[11] Meyers, M. and K. Chawla, Mechanical Behavior of Materials. 2 ed.
2009: Cambridge University Press.
[12] Gibson, L.J. and M.F. Ashby, Cellular Solids: structure and properties.
Second edition ed. 1997: Cambridge University Press.
[13] Service, C.R.a.d.i., Optimized Structural Components and Add-ons to
Improve Passive Safety in New Electric Light Trucks and Vans
(ELTVs) 2011, UNIZAR.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:70450", author = "Haithem Elderrat and Huw Davies and Emmanuel Brousseau", title = "Improving the Exploitation of Fluid in Elastomeric Polymeric Isolator", abstract = "Elastomeric polymer foam has been used widely in
the automotive industry, especially for isolating unwanted vibrations.
Such material is able to absorb unwanted vibration due to its
combination of elastic and viscous properties. However, the ‘creep
effect’, poor stress distribution and susceptibility to high
temperatures are the main disadvantages of such a system.
In this study, improvements in the performance of elastomeric
foam as a vibration isolator were investigated using the concept of
Foam Filled Fluid (FFFluid). In FFFluid devices, the foam takes the
form of capsule shapes, and is mixed with viscous fluid, while the
mixture is contained in a closed vessel. When the FFFluid isolator is
affected by vibrations, energy is absorbed, due to the elastic strain of
the foam. As the foam is compressed, there is also movement of the
fluid, which contributes to further energy absorption as the fluid
shears. Also, and dependent on the design adopted, the packaging
could also attenuate vibration through energy absorption via friction
and/or elastic strain.
The present study focuses on the advantages of the FFFluid
concept over the dry polymeric foam in the role of vibration isolation.
This comparative study between the performance of dry foam and the
FFFluid was made according to experimental procedures. The paper
concludes by evaluating the performance of the FFFluid isolator in
the suspension system of a light vehicle. One outcome of this
research is that the FFFluid may preferable over elastomer isolators
in certain applications, as it enables a reduction in the effects of high
temperatures and of ‘creep effects’, thereby increasing the reliability
and load distribution. The stiffness coefficient of the system has
increased about 60% by using an FFFluid sample. The technology
represented by the FFFluid is therefore considered by this research
suitable for application in the suspension system of a light vehicle.", keywords = "Anti-vibration devices, dry foam, FFFluid.", volume = "9", number = "8", pages = "1467-6", }