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Application of the path-repairing technique and virus optimization algorithm for the dimensional synthesis of four-bar mechanisms

Grabski Jakub Krzysztof, Sopa Martyna, Mrozek Agata

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 2

art. no. e134, 2023

EN

This paper considers the synthesis of the four-bar mechanism. It is treated here as an optimization problem, in which an objective function is defined. To solve this problem, a metaheuristic called the virus optimization algorithm is employed. Furthermore, a new path-repairing technique recently published by Sleesongsom and Bureerat is applied instead of the very common technique related to the application of a penalty function. This makes the search by means of the metaheuristic more efficient. Furthermore, the obtained results are very accurate.

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Application of artificial neural networks in fall prediction

Walczak Tomasz, Sopa Martyna, Pogorzała Adam M.

Vibrations in Physical Systems

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2021

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Vol. 32, nr 2

art. no. 2021210

EN

The problem of fall is still unsolved even though it is a serious problem, especially in group of elderly. Also, another difficulty is to analyse falls that occur in day-to-day life. Those events are hard to observe by specialists and so it is hard to analyse them. Following work contains a description of experimental process for external force-caused fall observation with the use of motion capture system and dynamometric platforms. Data collected according to this protocol were later used for time series neural networks. Obtained results of analysis were compared to popular model of human stability. Conducted inquiry proves that it is possible to detect fall even before it occurs and while it is external force-caused fall the loss of stability develops earlier than it was assumed.

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Assessment of the functional movement screen test with the use of motion capture system by the example of trunk stability push-up exercise among adolescent female football players

Mrozek Agata, Sopa Martyna, Myszkowski Jakub, Bakiera Aleksandra, Budzisz Piotr, Kuliberda Agata, Białecka Martyna, Walczak Tomasz, Grabski Jakub Krzysztof, Grygorowicz Monika

Vibrations in Physical Systems

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2020

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Vol. 31, nr 2

art. no. 2020220

EN

The paper presents the application of the BTS motion capture system to verify the FMS test assessment. The research group consisted of adolescent female football players who underwent standard FMS assessment by a physiotherapist. In order to objectify the physical performance assessment, a mechanical model was proposed, on the basis of which the parameters supporting the evaluation of the test were defined. The example of the analysis of one of the exercises (push-ups) presented in the paper showed that even the players who obtained the highest marks in the test do not always perform the exercises flawlessly, which is a consequence of subjective assessment made by specialists. The use of a motion capture system together with an appropriate biomechanical model allows for a much more objective assessment of the physical performance and detecting any dysfunction of the movement apparatus of the examined persons.