Wyniki wyszukiwania - BazTech

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Biomechanical properties of bicortical and monocortical plate fixation for rib fractures in the adolescent human rib fracture model

Glowacki Jakub, Bartkowiak Tomasz, Paczos Piotr, Zielinski Michał, Smyczynski Mikołaj, Pelic Marcin

Acta of Bioengineering and Biomechanics

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2023

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Vol. 25, no. 3

EN

The technical advancement of surgical stabilization of ribs often prevents the surgeons from fixation, despite the procedure`s documented improved outcomes. The aim of this study was to evaluate a less invasive approach involving a simplified monocortical rib fixation technique.

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Characterization of piezoelectric bimorph actuator 3d-deformations caused by electric change by means of multiscale curvature analysis

Bartkowiak Tomasz, Pelic Marcin

Vibrations in Physical Systems

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2020

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Vol. 31, nr 2

art. no. 2020203

EN

The objective of this work is to demonstrate the use of multiscale curvature tensor analysis to characterize deformations of piezoelectric bimorph actuator and to study the relation between loaded electric charge and the resulting deformed surface curvature. In particular, the strength of the correlations between surface shape characterized by curvature parameters (i.e., principal, Gaussian or mean curvature) and charge density is sought. The impact that the scale of the analysis of the curvature can have on the values of the curvature parameters for the deformed surfaces and the correlation with discharge energy is also studied. In this study the deformations of piezoelectric bimorph actuators are studied. In order to achieve quasi-static measurements, a dedicated charge amplifier was built to supply charge to the actuator. The deformations were then measured by Polytec® 3D laser scanning vibrometer PSV-400 by integration of captured motion. The obtained data was used to calculate curvature tensor field at multiple scales by applying the normal-based method. Principal, mean and Gaussian curvature was calculated at multiple scales and were correlated with applied charge. The obtained results contribute to better understanding of piezoelectric behavior under electric field.

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Kinematic model of multiple trailers on a tractor system for production logistics applications

Paszkowiak Wojciech, Bartkowiak Tomasz, Pelic Marcin

Archives of Mechanical Technology and Materials

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2019

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Vol. 39

16--25

EN

This paper demonstrates kinematic analysis of multiple trailers on a tractor system for production logistics. The analysis concerned three different steering systems of the trailers: virtual clutch and drawbar system, conventional clutch and drawbar system, double Ackermann steering system. Designed kinematic models contain various variants of paths: turning at a constant value of the steering angle, changing the steering angle as a result of an approaching collision. Each of these variants also included driving in a straight line after a 90° turn. The validation of the developed kinematic model was done by using a real logistic train, which path was registered via aerial drone. For each of the developed kinematic models, a visualization of drive through the 90° turn was created.