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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.

2

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.

3

The effect of post-weld heat treatment temperature on the structure and hardness of joints made in steel 10CrMoVNb9-1

Kotarska Aleksandra, Górka Jacek, Walczak Tomasz

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2020

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Vol. 64, No. 2

7--12

EN

The article discusses the effect of annealing temperature applied during heat treatment as well as the suitability of preheating before the welding of butt joints in pipes (having a diameter of 33.7 mm and a wall thickness of 4.5 mm) made of steel X10CrMoVNb9-1 (P91). In the article, the structure and properties of a joint subjected to heat treatment performed in accordance with manufacturing standards concerning power unit elements are compared with those of a joint not subjected to heat treatment. The welding process discussed in the paper was based on the TIG method and involved the use of filler metal Thermanit MTS 3 (W Cr Mo 91). The material of steel X10CrMoVNb9-1 after welding and not subjected to heat treatment is both very hard and brittle. Because of the fact that the power engineering steel of the above-presented characteristics cannot be exposed to the effect of a high-pressure and high-temperature medium (due to possible crack formation), the welding of such steel should be followed by appropriate post-weld heat treatment.

PL

Poddano ocenie wpływ temperatury wyżarzania podczas obróbki cieplnej oraz zasadności zastosowania podgrzewania wstępnego przed spawaniem złączy doczołowych rur ze stali X10CrMoVNb9-1 (P91) o średnicy 33,7 mm i grubości ścianki 4,5 mm. Porównano struktury i własności złącza po obróbce cieplnej wykonanej zgodnie z normami wykonawczymi dla elementów bloków energetycznych ze strukturą i własnościami złącza niepoddanego obróbce cieplnej. Proces spawania przeprowadzono metodą TIG przy użyciu materiału dodatkowego Thermanit MTS 3 (W Cr Mo 91). Materiał stali X10CrMoVNb9-1 po spawaniu i bez obróbki cieplnej jest bardzo twardy i kruchy. Stal energetyczna w takim stanie nie sprawdzi się w warunkach oddziaływania dużego ciśnienia medium o wysokiej temperaturze i może to być przyczyną powstania pęknięć, dlatego też odpowiednia obróbka cieplna po spawaniu jest konieczna.

4

Zastosowanie systemu analizy ruchu BTS do określenia chwili utraty stabilności

Matuszewska Agata, Liszkowski Jakub, Walczak Tomasz, Buśkiewicz Jacek

Aktualne Problemy Biomechaniki

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2019

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z. 17

69--76

PL

W pracy przeprowadzono próbę wyznaczenia chwili utraty stabilności dla upadków z pozycji statycznej. Pozycją początkową, jaką przyjmowała osoba badana, było stanie na dwóch nogach z rękami wzdłuż tułowia. Rejestracji ruchu dokonano dzięki wykorzystaniu systemu BTS. W celu wyznaczenia chwili utraty stabilności zaproponowano i opracowano własne miary i parametry, bazujące na pomiarach wykonanych z użyciem platform dynamometrycznych oraz systemu analizy ruchu. Dla analizowanego przypadku ruchu wielkości te pozwoliły na szacunkowe wyznaczenie chwili utraty stabilności.

EN

Assessing of human stability loss was performed at this work in case of falls from a static position. At the beginning patient takes the starting position as standing on two legs with hands along the thorax. Human motion registration was performed by using BTS system. In order to determine the instant of human stability loss the new measures and parameters were proposed, which based on measurements from force platforms and motion analysis system. These parameters allowed to assess the instant of stability loss for analyzed motion.