Measurements of rubber isolator stiffness at non-sinusoidal excitation
2003 (English)In: Proceedings of the Tenth International Congress on Sound and Vibration, Stockholm, 2003, 821-826 p.Conference paper (Other academic)
The impact of multiple signal excitation on stiffness and damping of a filled rubber isolator is investigated through measurements. For single harmonic excitation stiffness and damping are found to exhibit the well-known Payne effect - being an amplitude dependence where stiffness is high for small excitation amplitudes and low for large amplitudes while damping displays a maximum at intermediate amplitudes. While expanding the measurements to a multiple harmonic excitation, the commonly assumed validity of the superposition principle of single harmonic responses is shown to fail as stiffness at a small excitation amplitude and high frequency is reduced and damping increased while superimposing a large amplitude low frequency excitation component. Essentially the same influence on the reference characteristics is obtained while superimposing low frequency noise signals. It is also shown that the relative frequency difference between the reference and the superimposed signal is of importance. As a rule of thumb, the largest excitation amplitude over the isolator normally determines the stiffness at the reference frequency while the influence of envelop amplitude is increased as its frequency approaches that of the component of interest.
Place, publisher, year, edition, pages
Stockholm, 2003. 821-826 p.
, Proceedings of the Tenth International Congress on Sound and Vibration
IdentifiersURN: urn:nbn:se:kth:diva-82469OAI: oai:DiVA.org:kth-82469DiVA: diva2:498269
Tenth International Congress on Sound and Vibration
Sponsors: International Institute of Acoustics and Vibration, IIAV; Royal Institute of Technology, KTH; Scandinavian Vibration Society, SVIB NR 201408052012-02-112012-02-112012-02-11Bibliographically approved