A Study of Nonlinear Effects in a Cushion-Product System on its Vibration Transmissibility Estimates with the Reverse Multiple Input-Single Output Technique

作者：Sek Michael A^*; Rouillard Vincent; Parker Anthony J

来源：Packaging Technology and Science, 2013, 26(3): 125-135.

DOI：10.1002/pts.1970

• transmissibility
• nonlinearity
• resonance search
• Reverse MISO
• vibration

The Reverse Multiple InputSingle Output (R-MISO) identification technique was implemented to determine vibration transmissibility frequency response functions (FRFs) of a cushion-product system that accounts for nonlinearities known to exist in such systems. The signed quadratic x|x| nonlinear term was used. The results were compared with the classical linear approximation FRFs calculated with the single inputsingle output identification method. Comparisons were made for five types of expanded polystyrene (EPS) cushions with varying density and two levels of band-limited random excitation. It was shown that vibration transmissibility FRFs obtained with the R-MISO method and with the inclusion of a signed quadratic x|x| nonlinear term significantly (up to similar to 70%) improved the total coherence of the nonlinear vibration transmissibility FRFs for the EPS cushions subjected to the static load selected to coincide with the optimum of their respective cushion curves. The R-MISO technique was successful in accounting for some of the nonlinearities in the EPS cushion-product system. However, its ability to deal with nonlinearities is not specific to the EPS but rather common to cushion-product systems subjected to vertical vibrations.

• 出版日期2013-5