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Dynamic stiffness of chemically and physically ageing rubber vibration isolators in the audible frequency range: Part 2-waveguide solution
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-5760-3919
2017 (English)In: Continuum Mechanics and Thermodynamics, ISSN 0935-1175, E-ISSN 1432-0959, Vol. 29, no 5, p. 1047-1059Article in journal (Refereed) Published
Abstract [en]

The dynamic stiffness of a chemically and physically ageing rubber vibration isolator in the audible frequency range is modelled as a function of ageing temperature, ageing time, actual temperature, time, frequency and isolator dimension. In particular, the dynamic stiffness for an axially symmetric, homogeneously aged rubber vibration isolator is derived by waveguides where the eigenmodes given by the dispersion relation for an infinite cylinder satisfying traction free radial surface boundary condition are matched to satisfy the displacement boundary conditions at the lateral surface ends of the finite rubber cylinder. The constitutive equations are derived in a companion paper (Part 1). The dynamic stiffness is calculated over the whole audible frequency range 20-20,000 Hz at several physical ageing times for a temperature history starting at thermodynamic equilibrium at +25 degrees C and exposed by a sudden temperature step down to -60 degrees C and at several chemical ageing times at temperature +25 degrees C with simultaneous molecular network scission and reformation. The dynamic stiffness results are displaying a strong frequency dependence at a short physical ageing time, showing stiffness magnitude peaks and troughs, and a strong physical ageing time dependence, showing a large stiffness magnitude increase with the increased physical ageing time, while the peaks and troughs are smoothed out. Likewise, stiffness magnitude peaks and troughs are frequency-shifted with increased chemical ageing time. The developed model is possible to apply for dynamic stiffness prediction of rubber vibration isolator over a broad audible frequency range under realistic environmental condition of chemical ageing, mainly attributed to oxygen exposure from outside and of physical ageing, primarily perceived at low-temperature steps.

Place, publisher, year, edition, pages
SPRINGER , 2017. Vol. 29, no 5, p. 1047-1059
Keywords [en]
Dynamic stiffness, Vibration isolator, Chemically and physically ageing, Waveguide, Mode-matching
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-214319DOI: 10.1007/s00161-017-0573-yISI: 000408062000002Scopus ID: 2-s2.0-85019180612OAI: oai:DiVA.org:kth-214319DiVA, id: diva2:1140923
Note

QC 20170913

Available from: 2017-09-13 Created: 2017-09-13 Last updated: 2017-09-13Bibliographically approved

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Kari, Leif

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