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Semi-active linear vacuum packed particles damper

Zalewski R., Chodkiewicz P.

Journal of Theoretical and Applied Mechanics

2016

Vol. 54 nr 1

311--316

In this paper, the authors focus on the proposition of an innovative semi-active linear damper prototype working on the basis of granular materials. Vacuum Packed Particles (VPP) belong to the class of materials whose mechanical (rheological, dissipative) properties may be quickly changed by applying a partial vacuum inside the system. The concept of an innovative linear damper based on VPP is presented in the paper. Typical experimental results are presented to reveal changeable damping characteristics of the device. Additionally, the mathematical model is proposed to capture extraordinary features of the investigated damper.

Calibration of the Bodner-Partom Constitutive Model for Vacuum Packed Particles Using Simulated Annealing Algorithm

Zalewski R., Pyrz M., Chodkiewicz P.

Machine Dynamics Research

2015

Vol. 39, No. 3

93-101

The work is related to the numerical modeling of Vacuum Packed Particles (VPP)-structures composed of grains enclosed in an elastic envelope and submitted to internal underpressure. The behavior of the material is modeled using viscoplastic law of Bodner-Partom. The inverse problem of constitutive model parameter identification is solved using the non deterministic optimization procedure based on simulated annealing algorithm. The results of numerical simulation are compared with experimental results.

Computer Simulation of Shallow Fluid Flow

Chodkiewicz P., Zalewski R.

Machine Dynamics Research

2013

Vol. 37, No. 2

15-21

This paper presents how to implement the algorithm applied to simulate shallow incompressible fluid. Finite difference discretisation of complex equations for incompressible fluid velocity have been presented. The results of the algorithms will be presented in the form of graphics generated by the application enabling simulating and observing the movement of the fluid in a real time.