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Kinovea analysis of high-speed video recording to determine kinematics of double pendulum in the long time scale

Wojewoda Jerzy

Bulletin of the Polish Academy of Sciences. Technical Sciences

2023

Vol. 71, nr 6

art. no. e147918

Measurement of position and velocity of rotating objects relies on installation of additional devices, which can significantly change their dynamic properties. Non-contact methods appear not to have the above-mentioned drawback. To determine the angular kinematics, a video measurement technique stands as a non-contact alternative. The rotational motion can be recorded with a high-speed camera and then analyzed with free and open-source tracking software which allows one to detect and digitize positions of chosen markers and then to calculate angular positions of selected elements. Differentiation process determines rotary speed values. Analysis of long-term dynamical behavior by recording data visualized as position maps which possess half of the information usually stored in the well-known Poincaré maps is proposed.

Sensitivity analysis of internally reinforced thin-walled hollow-box beams subjected to uncoupled bending and torsion

Silva Hugo Miguel, Wojewoda Jerzy

Mechanics and Mechanical Engineering

2019

Vol. 23, nr 1

1--8

In this work, novel types of internally reinforced hollow-box beams were subjected to bending loading and studied using the finite element analysis software ANSYS. A parameterization of 3 geometric variables was performed, and deflection and effective deflection results were collected from 2 points at the model. The sensitivity analysis results are then discussed, with the aim of concluding if the selected design variables are adequate for optimization purposes.