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Quantification of gait asymmetry in patients with ankle foot orthoses based on hip–hip cyclograms

Kutilek P., Socha V., Viteckova S., Svoboda Z.

Biocybernetics and Biomedical Engineering

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2014

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Vol. 34, no. 1

46--52

EN

Our work focuses on a new approach of studying asymmetry in walking based on the orientation of the synchronized bilateral hip–hip cyclograms. Patients with foot drop were included in the study and were asked to walk without an orthosis, and with foot-up splint, calf mounted support strap and ankle wrap. The hip–hip cyclograms were created to quantify gait asymmetry before and immediately after the application of ankle foot orthoses. This approach has never been applied before to study the gait asymmetry in patients with ankle foot orthoses. In order to quantify the gait asymmetry, we have tested the application of the approach based on the inclination angle of the synchronized hip–hip cyclograms. The symmetry index was used as a comparative method to evaluate the symmetry of bipedal walking. The results indicate the correlation between the symmetry index and inclination angle of the synchronized hip–hip cyclograms. The methods based on the inclination angle and symmetry index show slightly different results because the symmetry index depends on discrete variables and is unable to reflect the asymmetry as it evolves over a complete gait cycle. The inclination angle of the hip–hip cyclogram depends on the complete gait cycle. Except for the inclination angles of patients with the support strap, the results show that the new approach did not identify significant improvement in the gait symmetry after the application of the orthoses. The approach based on the orientation of the hip–hip cyclograms can be used as an additional approach for determining the gait asymmetry.

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Improvement of Automated Calculation of Process Bailing of Vacuum Systems

Sheremeta R., Sheremeta B.

Machine Dynamics Research

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2011

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Vol. 35, No. 3

67-73

EN

Evacuating installations of manufacturing equipment used in industry should not only be technically perfect, but also economically beneficial. To ensure such requirements are ecessary to carry out mathematical modeling of the process pumping. This allows you to make optimal cyclogram of individual elements of the physical vacuum system installation. To facilitate the planning of vacuum systems should automatize the calculations of parameters of the gas environment at typical pumping modes of physical facilities.

3

Computer Simulation of Needle and Take-up Lever Mechanism Using the ADAMS Software Package

Žunič-Lojen D., Gotlih K.

Fibres & Textiles in Eastern Europe

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2003

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Vol. 11, no. 4 (43)

39--44

EN

A knowledge of the interactions between a sewing machine’s mechanisms and the sewing thread in the stitch formation process should help us to understand thread loadings in the sewing process. The aim of this work is to analyse the needle bar’s kinematics with the thread take-up lever by using computer simulation. A cyclogram was drawn on the basis of modelling and kinematic simulation of a needle bar with a thread take-up lever, and measurements of the thread tension forces in the sewing process. This cyclogram enables analysis of the interactions between the thread and the elements of the sewing machine. The results of these simulations are curves that describe the movements at characteristic points on the mechanism. These give the possibility of pinpointing the exact positions of the mechanism’s elements with respect to the main shaft rotation in the sewing machine.

PL

Znajomość współdziałania mechanizmów maszyny szwalniczej i nici w procesie formowania ściegu pozwala na zrozumienie obciążeń występujących w nici podczas szycia. Celem pracy była analiza, za pomocą symulacji komputerowej, kinematyki igielnicy i współpracującego z nią napinacza nici. Na podstawie modelowania i symulacji kinematyki wyżej wspomnianych mechanizmów wykreślono cyklogram. Wykonano pomiary sił naprężających nici podczas procesu szycia. Opracowany cyklogram pozwolił na analizę interakcji pomiędzy nicią a elementami maszyny szwalniczej. Wynikiem symulacji były krzywe opisujące ruchy charakterystycznych punktów mechanizmów. To z kolei stworzyło możliwość dokładnego wyznaczenia pozycji elementów tych mechanizmów, uwzględniając rotację wału głównego maszyny szwalniczej.