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Research on elastic-damping properties of unit loads

Piątkowski T.

Journal of Polish CIMAC

2013

Vol. 8, no 3

75--81

In the paper, the results of tests of free-fall of unit load (cubicoidal package) from a height on the stiff ground are presented. The aim of this study is to determine the elastic-damping properties of packaging for all surfaces, edges and corners. These tests allow us to evaluate the protective ability of packages in case of impact in any direction typical for real transport systems. The maximum accelerations registered during experimental tests are subjected to approximation by means of B-spline surface. It enables the visual interpretation of data in three-dimensional space, allowing detection critical packaging places for the safety of transported goods. In addition, the registered acceleration waveforms were used to determine the coefficients of: restitution, damping and rigidity. These parameters are required to the analytical descriptions of loads contact with obstacles - such as in the models of sorting or positioning processes of packagings.

Spatial approximation of impact test results of unit load

Piątkowski T., Sempruch J., Tomaszewski T.

Journal of Polish CIMAC

2012

Vol. 7, no 3

243-251

The paper presents an application proposal of B-spline surface of third order in the approximation of test results of unit load impact. The accelerations appearing during tests of free fall of the object from the height on undeformable ground were recorded by means of tri-axial acceleration sensor placed inside the tested load. An approximation was realized with the help of numeric optimization using the SQP method. The control points, forming initially the sphere surface, are the decision variables of the optimization task. The spatial visualization of data (using B-spline surface) is developed to streamline an interpretation and analysis of results recorded during tests. It allows precise load places determination, which require introduction of constructional modifications to improve the protective packaging properties.