Testing of nonlinear interaction effects of sinusoidal and noise excitation on rubber isolator stiffness
2003 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 22, no 3, 343-351 p.Article in journal (Refereed) Published
The nonlinear excitation effects on dynamic stiffness and damping of a filled rubber isolator are investigated through measurements. For a single harmonic excitation they are found to exhibit a strong amplitude dependence, following the well-known Payne effect where stiffness is high for small excitation amplitudes and low for large amplitudes while damping displays a maximum at intermediate amplitudes. However, expanding the measurements to a multiple harmonic excitation, the commonly applied superimposition principle of single harmonic responses due to this excitation is shown to be non-valid. On the contrary, it is found that reference stiffness at a small excitation amplitude and high frequency is reduced and damping increased while superimposing a large amplitude low frequency excitation component. Superimposition of low frequency noise signals displays essentially the same influence on the reference characteristics. As a rule of thumb, the largest excitation amplitude over the isolator normally determines the stiffness at the reference frequency while the influence of envelope amplitude is increased as its frequency approaches that of the component of interest.
Place, publisher, year, edition, pages
2003. Vol. 22, no 3, 343-351 p.
rubber isolator, measurement, dynamic stiffness, damping, nonlinear, Payne effect, dynamic properties, behavior
IdentifiersURN: urn:nbn:se:kth:diva-22242DOI: 10.1016/s0142-9418(02)00110-1ISI: 000180951300015OAI: oai:DiVA.org:kth-22242DiVA: diva2:340940
QC 20100525 NR 201408042010-08-102010-08-102012-02-11Bibliographically approved