A study on dynamic responses properties of packaged products under different spectral excitation

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (24) : 218-226.

WANG Zhiwei1,2,3, FANG Shugai1,2,3

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Abstract

Two types of acceleration random vibration power spectral density (PSD) excitations were set up according to the results of sine sweep vibration experiments, which had the same spectrum in the vicinity of the resonance frequency and different spectrum in the vicinity of the non-resonance frequency.The acceleration responses of product and dynamic contact force responses of packaged product were investigated with three kinds of constraints and input intensities for the nonlinear packaging system.The results indicate that under the same constraint and vibration intensity condition, the acceleration response PSDs of product and dynamic contact force response PSDs of package were basically consistent around the resonance frequencies; when the vibration intensity was higher, the acceleration response PSD of product and dynamic contact force response PSD of package under the two types of spectral excitations had a certain deviation in the small range of the resonance point due to the influence of the damping; the probability density function (PDF) of acceleration responses almost showed no difference under the different spectral excitations, and the values of mean, standard deviation, skewness and kurtosis were close; there were some differences between the PDF of the peak of dynamic contact force, and the distributions in the spectrum 1 were narrower and higher than that in the spectrum 2; however, the values of mean and standard deviation, number of mean value crossings and number of maxima of dynamic contact force, and bandwidth coefficient were close.Excitation of resonant region controls the responses of the whole nonlinear packaging system.

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spectrum / power spectral density(PSD) / probability density function(PDF) / dynamic contact force / peak distribution

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WANG Zhiwei1,2,3, FANG Shugai1,2,3. A study on dynamic responses properties of packaged products under different spectral excitation[J]. Journal of Vibration and Shock, 2019, 38(24): 218-226

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