Model of inelastic impact of unit loads

Abstract

In this study, the authors present a model of the inelastic impact of bodies that takes place during handling of unit loads (cubiform parcels). A modifi ed non-linear Kelvin model is proposed, in which the relationships between object strains and elastic and damping forces of the impact are represented by power functions. The results of analytical investigations on the proposed model were confi rmed by experiments consisting in tests of free fall of the load on rigid ground and on elastic beam. The developed model allows the assessment of the infl uence of mechanical properties of loads and conveyor-line defl ection mechanisms as well as impact velocity, on the dynamic forces exerted on the manipulated objects during the impact.

Inverse Sub-Structuring Method for Multi-Coordinate Coupled Product Transport System

“…Although the method was obtained in the case of the three‐sub‐structure coupled system, it can also be achieved for the system with multi‐sub‐structures by using a similar but more complex derivation. However, the sub‐structures are always connected by multi‐coordinate coupling and the non‐linear characteristics cannot be neglected . It is desirable to establish the inverse sub‐structuring method for a multi‐coordinate coupled product transport system with non‐linear joints.…”

“…However, the substructures are always connected by multi-coordinate coupling and the non-linear characteristics cannot be neglected. 20 It is desirable to establish the inverse sub-structuring method for a multi-coordinate coupled product transport system with non-linear joints. In this paper, we first investigate the FRF-based inverse sub-structuring method for a three-component coupled product transport system with multi-coordinate coupling.…”

Modified Method for Dynamic Stress-Strain Curve Determination of Closed-Cell Foams

“…The collision process between platen and cushioning material is usually modelled as the mechanical system with one degree of freedom. The platen (Figure ) is treated as a point mass and the cushioning material as a massless body with elastic‐damping properties …”

“…The platen ( Figure 1) is treated as a point mass and the cushioning material as a massless body with elastic-damping properties. 8 The papers 9-12 present a dynamic stress-energy density method that requires only 10 drop tests to determine any set of cushion curves (for the material made of closed-cell foam). The tests are selected in a way to ensure a uniform coverage of the accepted range of energy absorbed by the cushioning material: E d ∈hE d min ; E d max i, where: E d = σ s h/d.…”

Method of controlling the outflow of liquid from the sprayer during the dressing process

“…Achieving these objectives causes that putting fence in the rotary motion becomes less energy-intensive and the packaging collision against the light fence becomes milder (Piatkowski et al, 2009). In the paper (Piatkowski, 2010) the fence with curvilinear outline was presented, which provides constant bending stress along the arm.…”