Physical and Mathematical Modeling of Vibration Isolation for Cargo in a Container with Polyurethane Shock Absorbers

This paper presents dynamic tests results for a scale model of the vibration isolation system for cargo in a container with polyurethane tunnel shock absorbers. Vibration isolation properties of polyurethane shock absorbers are studied. Scale models made of SKU-PFL-100 and SUREL TF-228 polyurethane materials and geometrically similar to real shock absorbers are used in the tests. The behavior of the ‘container–shock absorbers–cargo’ system is investigated at harmonious and impulse kinematic excitation. The system’s frequency-response characteristic, effective rigidity of the shock absorbers and energy loss factor are determined. A mathematical model for calculating the vibration isolation system is proposed where the behavior of the shock absorbers is described by the linear viscoelasticity theory. Parameters of the model are derived from the test results. The test results can be extended to a full-scale object by applying the similarity theory.

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