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Wyświetlanie 1-15 z 34
Tytuł:
Sensitivity study on seat belt system key factors in terms of disabled driver behavior during frontal crash
Autorzy:
Sibilski, Kamil
Małachowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/306683.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
niepełnosprawność
kierowca
metoda elementów skończonych
bezpieczeństwo
biomechanika
disability
driver
finite element method
safety
biomechanics
Opis:
Each year, many cars (in Poland approximately three hundred) are adopted for disabled driver, to enable them to drive the car independently. The purpose of the paper is to assess the key factors which significantly influence the disabled driver behavior during a frontal crash and have the biggest impact on the safety factors. Methods: To achieve the purpose of the paper, the finite element method was used. The authors built the numerical model which includes operation of all safety systems operating in the real car (sensors, seat belts, airbag). Using this method, the authors simulated few different cases of the frontal crash of the car driven by a person with disabilities. Results: The obtained results were: displacements, velocities and accelerations of the head, pelvis and shoulders. Additional results were also loads in the neck. Based on the achieved results, several biomechanical parameters and criterions (HIC, Nij) were computed. Conclusions: Therefore, during car adaptation for disabled drivers using a four-point seat belts system, this parameter can be optimized to reduce forces acting on the driver chest. Higher values of the force limit reduce Nij and increase HIC and contact forces between the dummy and seatbelts. Therefore, during designing of the pyrotechnic four-point seat belts system, the pretensioner characteristics should be analyzed taking all the driver’s biomechanical parameters into account.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 4; 169-180
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization programming tools supporting supply chain management
Autorzy:
Szkutnik-Rogoż, Joanna
Małachowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/27311443.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
mathematical programming
optimization
supply chain
programowanie matematyczne
optymalizacja
łańcuch dostaw
Opis:
The issue of transportation is a particular type of mathematical programming that facilitates searching for and determining an optimal distribution network, considering the set of suppliers and recipients. This paper uses a numerical example to present a solution to a transport problem utilizing classical computation methods, i.e., the northwest corner, the least cost in a matrix, and the VAM approximation method. The objective of the paper was to develop tools in the form of algorithms that would then be implemented in three various computing environments (R, GNU Octave, and Matlab) that allow us to optimize transport costs within an assumed supply network. The model involved determining decision variables and indicating limiting conditions. Furthermore, the authors interpreted and visualized the obtained results. The implementation of the proposed solution enables users to determine an optimal transport plan for individually defined criteria.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e145570
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-Markov approach for reliability modelling of light utility vehicles
Autorzy:
Oszczypała, Mateusz
Ziółkowski, Jarosław
Małachowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/24200838.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
semi-Markov model
reliability modelling
readiness
maintenance analysis
transportation system
Opis:
Vehicles are important elements of military transport systems. Semi-Markov processes, owing to the generic assumption form, are a useful tool for modelling the operation process of numerous technical objects and systems. The suggested approach is an extension of existing stochastic methods employed for a wide spectrum of technical objects; however, research on light utility vehicles complements the subject gap in the scientific literature. This research paper discusses the 3-state semi-Markov model implemented for the purposes of developing reliability analyses. Based on an empirical course of the operation process, the model was validated in terms of determining the conditional probabilities of interstate transitions for an embedded Markov chain, as well as parameters of time distribution functions. The Laplace transform was used to determine the reliability function, the failure probability density function, the failure intensity, and the expected time to failure. The readiness index values were calculated on ergodic probabilities.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 2; art. no. 161859
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stabilność rozwiązań sprężysto-plastycznych zagadnień dynamiki
Stability of solutions elastic-plastic dynamic issues
Autorzy:
Dobrociński, Stanisław (1941- ).
Flis, Leszek.
Małachowski, Jerzy.
Powiązania:
Zeszyty Naukowe / Akademia Marynarki Wojennej im. Bohaterów Westerplatte 2013, nr 1(192), s. 39-53
Data publikacji:
2013
Tematy:
Metoda elementów skończonych stosowanie
Postęp techniczny
Metody badawcze
Naprężenia i odkształcenia
Pręty
Opis:
Rys., tab.
Bibliogr.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Study of rock fracture under blast loading
Autorzy:
Baranowski, Paweł
Kucewicz, Michał
Pytlik, Mateusz
Małachowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2173700.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Johnson-Holmquist II model
JH-2
rock
blasting
fracture
small-scale testing
model Johnsona-Holmquista II
głazy
strzałowy
pęknięcie
test na małą skalę
Opis:
A study of dolomite rock material failure using a simple small-scale blast setup is presented. Laboratory tests were conducted using disc specimens drilled with a borehole in the center. A detonation cord and a blasting cap were fitted inside the borehole to induce cracking and fracturing of the specimens. The specimens were inserted between two steel plates, which were compressed against the specimen using bolt screws. Prior to testing, the most suitable screw torque for constraining the vertical displacement of the specimen surfaces without compressing the specimen was selected based on numerical simulations. Then, the experimental tests with the blasting cap were simulated using the Johnson–Holmquist II (JH-2) material model, and the properties of the blasting cap were determined and verified in two special tests with a lead specimen. Possessing the validated model, the influence of specimen thickness on the cracking patterns was finally analyzed. This paper presents a relatively easy method for studying rock material behavior under blast loading and for validating the numerical and constitutive models used for rock simulations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e141723
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 34

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