Wyniki wyszukiwania - BazTech

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Evaluation of the effect of muscle forces implementation on the behavior of a dummy during a head-on collision

Sybilski Kamil, Mazurkiewicz Łukasz, Jurkojć Jacek, Michnik Robert, Małachowski Jerzy

Acta of Bioengineering and Biomechanics

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2021

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Vol. 23, no. 4

137--147

EN

Purpose: The aim of this study was to develop a method to implement muscle forces to a numerical model of a dummy and to evaluate the effect of muscle activation on driver behavior during a frontal collision. The authors focused on the forces acting at the knee, hip, and elbow joints. Methods: The authors carried out torque measurements in joints using the Biodex System 4. Then, the previously developed numerical models were modified by introducing the joint torque values. Moments of force were introduced as a function of the rotation angle. During research, numerical simulations were carried out in three stages: in the first stage, a full vehicle crash was analyzed to determine the change of velocity of the vehicle interior; in the second stage, subsidence of the system was realized; in the third stage, a frontal crash was simulated. The models considered the operation of the sensors, airbag and seat belt tensioning system. Results: A numerical model with the active response of the dummy to the change in position during impact was developed. The results of the dynamic analysis were used to analyze the impact of muscle activation on dummy behavior. The change in shoulders rotation angle, the lateral and vertical displacement of the dummy’s center of gravity, and the forces acting between the dummy and the seat belt were compared. Conclusions: The effect of muscle action on the behavior of a dummy during a frontal collision was determined.

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Experimental verification of the use of dummies for tests in empirical research

Więckowski D.

Journal of KONES

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2017

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Vol. 24, No. 1

357--362

EN

The issues related to the use of test dummies for experimental research in the field of automotive engineering have been addressed. The article discusses the historical introduction and development of the dummies in the biomechanical tests, which have contributed to the replacement of, previously conducted tests on corpses or volunteers. The evolution of dummies development Evolution of the dummies construction development to the present times has been presented. Question was raised: what is the “similarity” between the dummy living human being. Contemporary dummies reflect very well features of the human body are made of good quality materials and can be equipped with numerous sensors performing various measurements. Comparative empirical tests carried out with an adult dummy and a living adult of similar parameters such as: size (weight and height) body proportions have been presented. The impact of vibrations on the human occupant riding a motor vehicle was examined, with road tests being carried out of realized driving on various road surfaces within that work and with the data recorded being analysed in the time domain and frequency domain. In the time domain, time histories of the accelerations recorded were analysed and the root-mean-square (RMS) acceleration values were calculated. In the frequency domain, the power spectral density (PSD) values and the absolute transmittance (amplification) values were determined for the acceleration signals recorded. The analysis of the measurement results for the ability to absorb vibration by living human being and the dummy has been done. The differences and similarities between the living human subject and the test dummy have been presented from the point of view of utilizing such subjects for experimental tests.

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Modelowanie ciała człowieka przy zderzeniach z małymi prędkościami

Buraczewski P., Jackowski J.

Logistyka

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2014

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nr 3

915--921

PL

W niniejszym opracowaniu zaprezentowano wyniki próby opracowania prostego modelu ciała człowieka do prowadzenia badań symulacyjnych zderzeń z małymi prędkościami w środowisku MATLAB/Simulink. Przedstawiono model fizyczny będący podstawą do stworzenia modelu matematycznego z zastosowanymi uproszczeniami. Model zweryfikowano poprzez porównanie przebiegów przyspieszeń, prędkości i przemieszczeń poszczególnych części ciała manekina i opracowanego modelu symulacyjnego. Wskazano na zadawalającą wiarygodność modelu odwzorowującego ruchy torsu. Zwrócono jednak uwagę na potrzebę doskonalenia modelu połączenia głowy z torsem oraz połączenia manekina z fotelem (w tym charakterystyk pasów bezpieczeństwa).

EN

This paper presents the results of attempts to develop a simple model of the human body to conduct simulation studies of collisions at low speeds in MATLAB / Simulink. A physical model which is the basis for creating a mathematical model with the applied simplifications is shown. The model was verified by comparison of the acceleration, velocity and displacement of each part of the body of the dummy and the developed simulation model. The paper points out satisfactory accuracy of the model projection of torso movements,. but underlines the need to improve the model of connection of the torso and the head and connection of the dummy and the seat (including the characteristics of seat belts).

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Przegląd i analiza manekinów stosowanych do testów zderzeniowych

Jaśkiewicz M., Więckowski D., Witaszek K.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2013

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z. 101

47--48

PL

W niniejszym artykule przedstawiono różne rodzaje manekinów wykorzystywanych w testach zderzeniowych pojazdów samochodowych, do testów pojazdów rekreacyjnych czy wózków inwalidzkich.