Wyniki wyszukiwania - BazTech

1

Dependence of ski jump length on the skier's body pose at the beginning of take-off

Zanevskyy I., Banakh V.

Acta of Bioengineering and Biomechanics

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2010

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Vol. 12, no. 4

79-87

EN

A kinematical model of the ski jumper’s body pose at the beginning of take-off was proposed. A method of measuring skier’s body coordinates based on the results of video recordings and office information technologies was created. Kinematical parameters of the skier’s body pose at the beginning of take-off were determined using sport competition results of 33 ski jumpers. Five parameters of the pose which show statistically significant correlation ( đ < 0.03) with the jump length were determined. A part of variation of the model parameters in the total variation of the jump length is almost equal to 53%, and relative correlation is strong and significant ( p < 0.005). Recommendations regarding optimization of the body pose at the beginning of take-off were formulated.

2

Wyznaczenie parametrów ruchów przestrzennych za pomocą jednej kamery wideo

Dobosz D., Sobota G.

Aktualne Problemy Biomechaniki

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2009

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z. 3

29--34

PL

Celem pracy była próba wyznaczenia parametrów kinematycznych ruchów zachodzących w przestrzeni trójwymiarowej przy użycie prostych technik wideo. Wychodząc naprzeciw potrzebie rejestrowania i analizy złożonego aktu ruchowego opracowano systemy takie jak VICON, SMART BTS czy QUALISYS. Dzięki zastosowaniu więcej niż jednej kamery umożliwiają one badanie ruchu przestrzennego we wszystkich płaszczyznach z dużą dokładnością. W pracy zaproponowano algorytm pozwalający na wykorzystanie tylko jednej kamery wideo do wyznaczenia parametrów kinematycznych w innej płaszczyźnie niż płaszczyzna kamery, stosując dodatkowo informacje o parametrach antropometrycznych ciała człowieka. Praktyczne zastosowanie przetestowano dla badania kinematyki ruchu wyciskania sztangi na zawodnikach wysokiej klasy AWF Katowice.

EN

The goal of the paper is to try to point out the kinematical parameters of movements which take place in three - dimensional space by using simple video technique. To record and analyze the complicated body movement different systems such as VICON, Smart BTS or Qualisys have been worked out. With the use of more than one camera this programs enable us to study spatial movements in all plains with high precision. The Authors propose employing an algorithm which let us point out kinematical parameters in a plain other than the recording one, additionally using some information about anthropometric parameters of human body. The handiness of this method was tested during doing researches about kinematic of lifting. The people who participate in researches were high rang competitors from AWF Katowice.

3

Wpływ parametrów kinematycznych na zachowanie kierowcy podczas wypadku zderzenia przodem i tyłem samochodu

Gzik M., Świtoński E., Tejszerska D., Wolański W., Potkowa P., Alshamari N.

Modelowanie Inżynierskie

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2006

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T. 1, nr 32

187-192

PL

W artykule przedstawiono przeprowadzone badania na podstawie sformułowanego w systemie WorkingModel 2D płaskiego modelu kierowcy. Model uwzględnia wszystkie główne części budowy ciała, ze szczegółowym odwzorowaniem odcinków najbardziej narażonych na urazy: szyjnego i lędźwiowego odcinka kręgosłupa człowieka. Model został zweryfikowany na podstawie danych literaturowych testów prowadzonych na ochotnikach w zakresie bezpiecznych prędkości przez The Naval Biodynamic Laboratory in New Orleans in USA. Model wykorzystano do przeprowadzenia symulacji zachowania się kierowcy w sytuacjach rzeczywistych wypadków komunikacyjnych: zderzenia przodem oraz zderzenia tyłem.

EN

The article presents two - dimensional model of driver created with the use of Working Model 2D software. The model consists of every part of human body with detailed structure of cervical and lumbar spine. The parts of spine are the most exposed to injuries during accidents, especially cervical spine which injuries could cause serious consequences - paralysis or even death. The model of driver was validated on the basis of comparison of body movement in saggital plane, data from numerical simulation and from tests on volunteers performed by The Naval Biodynamic Laboratory in New Orleans in USA. Next the model was used to carry out numerical simulation for several cases corresponding to real accidents (front collision for velocity 28, 80, 120, 160 kmph, and rear collision for velocity 28, 80 kmph). The obtained results confirm that the velocity and constructions of collided vehicles also have the greater influence on human body behavior and possibility of injuries. Forces inside human body depend especially on velocity of a car at the hit moment. In a car velocity above 100kmph the passenger’s chances to survive rapidly decrease due to acting acceleration. The position of the driver in a car and the connections with internal car equipment are playing considerably less important role. Only safety belts are important for preventing situation dangerous for passenger’s security. The model could be used to analysis of other cases of accidents which assume other vehicle velocities during front and rear collisions. The researches were inspired by Sultan Bin Abdulaziz Al-Saud Foundation, from Saudi Arabia.

4

Determination of kinematic parameters of a passive bipedal walking robot moving on a declined surface by image processing

Bagheri A., Alitavoli M., Hajiloo A., Basiri S., Asadi H.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 16, nr 1-2

94--100

EN

Purpose: This paper describes the design and manufacturing of the mechanisms that are able to move on a slope according to its gravity. Design/methodology/approach: After presenting the governing equations and the dynamics of the robot, a computer simulation is developed. A comparison between the results from the physical model and the results from the numerical simulation is done to check the validity of the project. Findings: This robot is able to move down on slope with a minimum tangent based on the gravity and without any controller or any supplier. Research limitations/implications: Image processing has blind nodes in some frames and can not determine node positions and at this paper a method for getting rid of that problem has been developed. Position accuracy depends on ability of processing unit. Practical implications: This method could be used for finding of kinematic parameters of each manipulator while moving. Originality/value: This paper describes a method for finding kinematic parameters of a passive robot by image processing.