Research on freestanding package nonlinear rocking response under vehicle braking condition

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (16) : 152-158.

ZHU Dapeng1,QI Zhenmin1,2,CAO Xingxiao3

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Abstract

The freestanding package, excited by the half-sine pulse under the vehicle braking condition, sometimes easily overturns during the rocking motion. Therefore, the research on package rocking properties and overturning risks is important for cargo transportation safety. In this paper, nonlinear rocking response of freestanding package is analyzed(α>15°). A recurrent neural network is formulated and trained to simulate forced rocking response of freestanding package with accuracy. Given the initial response angle and angular velocity, in free rocking phase, the Jacobi elliptic functions are used to formulate analytical response expression, the energy conservation principle is applied, the package nonlinear rocking overturning condition is formulated in package free rocking phase. The package nonlinear forced and free response analysis methods are applied to obtain package overturning boundary condition, the simulation results indicate, in both forced and free response phase, the package make anticlockwise rotation about point O and may overturn. The altitude of pulse which can lead to package overturn in forced response phase is greater than that in free response phase, we can conclude the package rocking overturning is more inclined to occurs in free response phase.

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transport packaging / nonlinear rocking response / overturn condition / overturning parameter boundary

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ZHU Dapeng1,QI Zhenmin1,2,CAO Xingxiao3 . Research on freestanding package nonlinear rocking response under vehicle braking condition[J]. Journal of Vibration and Shock, 2024, 43(16): 152-158

References

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