Dynamic Performance of Stacked Packaging Units

Abstract

Stacked packaging units is the main form of distribution packaging of products. Its dynamic performance is not fully understood. This paper investigated the influence of the constraint, input vibration, location and contact nonlinearity on the dynamic performance of three layers stacked packaging units. The dynamic contact force between surfaces and acceleration response of products were obtained. In sine sweep vibrations, the constraint to stacked packaging units has an obvious influence on the dynamic characteristics. The acceleration response of product is associated with the vibration mode. The force amplification factor is in general between 1.5 and 2, but it can close to 3 on top layer in the case of no fixed. In random vibrations, non‐Gaussian data of dynamic contact force appear when Gaussian data of input vibration pass through the stacked packaging units, resulting a Weibull distribution of force level‐crossing. The force level‐crossing diagram becomes more abrupt with the decreasing of input vibration level, smoother from the top contact surface to middle and bottom ones, and moves right and becomes smoother with the constraint strengthen. In the case of lower input level, Gaussian distribution of force level‐crossing appears. The force power spectral density (PSD) between bottom box and table is much larger than that between boxes, which is significantly influenced by the first resonance frequency. However, the acceleration PSD of product is significantly influenced by both the first and second resonance frequencies, and controlled by the vibration mode. It depends much on the value of input acceleration PSD around the resonance frequencies.

Experimental investigation on bending fatigue failure of corrugated paperboard

“…Therefore, it is very important to consider the dynamic performance of fatigue failure when designing the box. The authors investigated the dynamic performance of stacked packaging units and obtained the statistical distribution of maximum dynamic compressive force between boxes under random vibration . This paper developed the S‐N equations and curves of corrugated paperboards.…”

“…The dynamic fatigue failure is its most important collapse mode. When excited by vehicle vibration, the corrugated boxes stacked may endure dynamic loads as much as 3 times the static load, the cyclic action of which may result in the fatigue failure of the boxes. The dynamic performance of stacked packaging units was studied by using operational modal analysis .…”

Measuring the mechanical and climatic conditions encountered by palletized products in handling and transport

“…In [31], the response of a pack was analysed by a laboratory model with the aim at reproducing the dynamic behaviour, together with the effect of several boundary conditions. A sine motion was used for forcing the system, a condition that is less representative of reality respect to random or data collection from experiments.…”

Comparison study on simulation effect of improved simulation methods for packaging random vibration test

“…Gaussian vibration signal generated by the current shaking table according to power spectral density (PSD) in the international standards, such as American Society for Testing and Materials (ASTM) and International Safe Transit Association (ISTA), is widely used for random vibration testing of product and cushion packaging in laboratory . However, the actual road vehicle vibration is non‐Gaussian and nonstationary.…”