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Wyszukujesz frazę "joint force" wg kryterium: Temat


Tytuł:
An artificial neural network approach and sensitivity analysis in predicting skeletal muscle forces
Autorzy:
Vilimek, M.
Powiązania:
https://bibliotekanauki.pl/articles/306321.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
staw łokciowy
mięśnie
sieć neuronowa
elbow joint
muscle force prediction
neural network
sensitivity analysis
Opis:
This paper presents the use of an artificial neural network (NN) approach for predicting the muscle forces around the elbow joint. The main goal was to create an artificial NN which could predict the musculotendon forces for any general muscle without significant errors. The input parameters for the network were morphological and anatomical musculotendon parameters, plus an activation level experimentally measured during a flexion/extension movement in the elbow. The muscle forces calculated by the ‘Virtual Muscle System’ provide the output. The cross-correlation coefficient expressing the ability of an artificial NN to predict the “true” force was in the range 0.97 - 0.98. A sensitivity analysis was used to eliminate the less sensitive inputs, and the final number of inputs for a sufficient prediction was nine. A variant of an artificial NN for a single specific muscle was also studied. The artificial NN for one specific muscle gives better results than a network for general muscles. This method is a good alternative to other approaches to calculating of muscle force.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 3; 119-127
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomechanical characterization of slope walking using musculoskeletal model simulation
Autorzy:
Masayuki, K.
Hata, K.
Kiyama, R.
Maeda, T.
Yone, K.
Powiązania:
https://bibliotekanauki.pl/articles/307044.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
analiza lokomocji
chód
choroba zwyrodnieniowa stawów
układ mięśniowo-szkieletowy
gait analysis
slope walking
osteoarthrosis
joint force
musculoskeletal model simulation
Opis:
Upslope and downslope walking are basic activities necessary for normal daily living in community, and they impose greater joint load on the lower extremities than during level walking. Thus, the purpose of this study was to quantify the resultant and shear forces in the hip and knee joints during slope walking. Methods: Twelve healthy volunteers were evaluated when walking under level and 10° up- and downslope conditions. Three-dimensional gait analysis was conducted using a 7-camera optoelectronic motion analysis system combined with a force plate to measure ground reactive force. Joint forces in the hip and knee joints were estimated using musculoskeletal model simulation. Results: Results showed that the resultant hip force was increased significantly to 117.2% and 126.9%, and the resultant knee force was increased to 133.5% and 144.5% in up- and downslope walking, respectively, compared to that of level walking. Furthermore, increased shear force in the hip and knee joints was noted during both slope walking conditions. Conclusions: This information may be beneficial for therapists advising elderly people or patients with osteoarthrosis on an appropriate gait pattern, gait assistive devices, or orthoses according to their living environment.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 1; 117-125
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamiczne oddziaływanie przegubu Cardana w funkcji skośności osi
Dynamic impact of Cardan joint in axis skewness function
Autorzy:
Fligiel, M.
Powiązania:
https://bibliotekanauki.pl/articles/313314.pdf
Data publikacji:
2015
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
przegub Cardana
wał napędowy pojazdu
przyspieszenie
prędkość kątowa
asynchroniczność
impuls momentu sił
Cardan joint
car driving shaft
asynchronicity of acceleration and angular velocities force moment impulse
Opis:
W opracowaniu rozpatruje się dynamikę oddziaływania przegubu Cardana na pracę wału napędowego pojazdu samochodowego. Na przykładzie hipotetycznego wału pędnego, mogącego występować w eksploatacji, rozpatruje się zmiany prędkości obrotowej, przyspieszenia kątowego, zmianę momentu sił oraz impulsu sił wału napędzanego, wynikającą z asynchroniczności obrotów wału napędzającego i napędzanego. Analizę przeprowadzono dla różnych kątów skośności osi wału napędzającego i napędzanego. Analiza dynamiczna potwierdza niekorzystne zjawiska występujące w czasie eksploatacji wałów napędowych.
The present study covers the dynamics of the impact of the Cardan joint on the work of the drive shaft in a car. On the example of a hypothetical propeller shaft, which may occur in operation, the following are considered: changes in the rotational speed, angular ac celeration, change of the moment of forces and an impulse of the forces of the driven shaft that is the result of the asynchronicity of the revolutions of the driving and driven shafts. An analysis was conducted for the various angles of the axis skewness of the driving and driven shafts. A dynamic analysis serves to confirm the occurrence of unfavourable phenomena in the operation of driving shafts.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2015, 16, 6; 81-86
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Działalność międzynarodowych organizacji na rzecz budowania bezpieczeństwa i pokoju w Kosowie
International organization’s activity for security and building peace in Kosovo
Autorzy:
Leszkiewicz, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/891369.pdf
Data publikacji:
2019-01-17
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
konflikt
misje pokojowe
organizacje międzynarodowe
operacja „Allied Force”
operacja „Joint Guardian”
współpraca cywilno-wojskowa
conflict
peacekeeping missions
international organizations
Operation
Allied Force
Operation Joint Guardian
civil-military cooperation
Opis:
Konflikt etniczny między Serbami a Albańczykami w Kosowie doprowadził do wybuchu konfliktu zbrojnego, któremu towarzyszyły przemoc i akty ludobójstwa. Zmusiło to organizacje międzynarodowe do podjęcia zdecydowanych działań w celu zakończenia konfliktu, a także rozpoczęcia procesu budowy pokoju i stabilizacji sytuacji w regionie. Dużą rolę w tych działaniach odegrały między innymi NATO, ONZ, OBWE czy UE. Autorka artykułu dokonała analizy roli tych organizacji w działaniach na rzecz przywrócenia pokoju i stabilizacji sytuacji politycznej w regionie, podjętych w ramach operacji „Allied Force”, KFOR oraz Misji Tymczasowej Administracji Organizacji Narodów Zjednoczonych w Kosowie (UNMIK).
The ethnic conflict between the Serbs and the Albanians in Kosovo led to the outbreak of armed conflict accompanied by violence and acts of genocide. It forced international organizations to take decisive action to end the conflict, as well as start a process of building peace and stabilize the situation in the region. NATO, the UN, the OSCE and the EU played a major role in these activities. The author of the article has analyzed the role of these organizations in efforts to restore peace and stabilize the political situation in the region undertaken as part of Operation Allied Force, KFOR and the United Nations Mission in Kosovo (UNMIK).
Źródło:
Kultura Bezpieczeństwa. Nauka – Praktyka – Refleksje; 2018, 31; 135-151
2299-4033
Pojawia się w:
Kultura Bezpieczeństwa. Nauka – Praktyka – Refleksje
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental strength analysis of riveted joints using blind rivets
Autorzy:
Witek, Lucjan
Lubas, Monika
Powiązania:
https://bibliotekanauki.pl/articles/243773.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
blind riveted joint
experimental investigations
shearing test
destructive force
chamfers
Opis:
This article presents results of experimental investigations of the lap blind riveted joint. The main goal of the work is determination of destructive load of the blind riveted joints. The blind rivets were originally used in the aircraft structures where access to both sides of the riveted structure is impossible. Blind rivets are now commonly used in many branches of industry because of their low cost. Moreover, the riveting process is uncomplicated. There are many publications about analysis of strength of solid rivets in the research literature. However, the strength analysis of the blind rivets was rarely undertaken. There is the research gap in the analysis of both the strength and the load capacity of blind riveted joints. The influence of selected geometrical parameters of the joint on the stress distribution and the destructive force was not widely described in literature. The first part of the work presents a review of standards and publications related to stress and strength analysis of blind riveted joints. The next part of the study describes experimental investigations of joints. The examined specimens were made out of AW 2017 aluminum alloy, cut from 1[mm] thick sheet. Investigated blind rivets were made out of aluminum alloy. The lap joint with one rivet and the single row five-rivet joint were investigated. Moreover, the different size of hole chamfer were considered. The experimental tests were performed with the use of Zwick-Roell tension machine. The main results of experimental investigations are ultimate shear load diagrams. The influence of both the hole chamfer and the number of rivets on destructive force and shear diagrams of blind riveted joints were in detail analysed. After shear tests, the fractured rivets were magnified in order to explain the failure phenomenon of blind rivets. In the future research works the obtained results will be used in strength analysis of the blind riveted joints using the finite element method.
Źródło:
Journal of KONES; 2019, 26, 1; 199-206
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Force analysis of shoulder joint muscles in the early phase of brain stroke
Autorzy:
Starosta, M.
Kostka, J.
Miller, E.
Powiązania:
https://bibliotekanauki.pl/articles/306827.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
siła mięśni
staw ramienny
udar
dynamometr
muscle force
upper limb
shoulder joint
stroke
dynamometer
Opis:
Upper limb impairment in the early phase of brain stroke is one of the key problems in rehabilitation. An estimation of muscle force can be a helpful factor for functional improvement after a stroke. The primary goals of this study were to determine the muscles with the lowest force in the affected (A) and non-affected (non-A) upper limb. Moreover, the differences between men and women were compared and these values were correlated with age. Methods: One hundred (n = 35 female, n = 65 male) post-stroke patients met the inclusion criteria. The mean age of the study participants was 66.1 years. Muscle force for external and internal rotators of shoulder was measured with handheld dynamometer. Moreover, the correlation coefficients for differences in muscular force with the patient’s age were estimated. Results: Our study reports that the force of the (A) side in relation to the (non-A) was by 37% weaker. We observed about a 40% decrease in the force of the shoulder’s external rotation (female – 42%; male – 41%) and shoulder’s flexion (by 38% – female; 40% – male). Significant correlations between the muscle force and the age of post-stroke patients were also found. It was concluded that about 4 weeks after the first stroke in the patient’s life, the external rotators are the most affected group of shoulder muscles. Conclusions: Neither sex nor the side of the ischemic brain injury influence the muscle force, whereas age determines both muscle force and muscle force deficits. Older post-stroke patients demonstrate fewer deficits in muscle strength than younger ones.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 3; 107-113
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Friction Stir Welding of Ultrathin AA2024-T3 Aluminum Sheets Using Ceramic Tool
Autorzy:
Myśliwiec, P.
Śliwa, R. E.
Ostrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/355870.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir welding
aluminum alloys
ceramic tools
FSW force measurements
low-cycle fatigue test
FSW joint durability
Opis:
The paper presents the results of research work on linear FSW (Friction Stir Welding) joining aluminum alloys AA2024-T3 of 0.5 mm in thickness. The study was conducted on properly adapted numerical controlled 3 axis milling machine using a ceramic tool and special designed fastening device. The tool dimensions have been estimated according to the algorithm shown in the literature [4]. All joints were made of end-to end (butt) configuration under different welding speed. The rotational speed of the tool and tool offset was constant. The effect of selected technological parameters on the quality of the joint was analyzed. Produced butt joint have been subjected to a static tensile testing to identify mechanical features of the materials of joints compared to parent materials. Measurements of micro hardness HV in the plastically formed stir zone of joint and in the parent material have been carried out. Axial and radial welding forces in the joining region were recorded during the tests and their dependency from the welding parameters was studied. Based on the results of strength tests the efficiency of joints for sheets of 0.5 mm in thicknesses oscillated up to 96% compared to the parent material. It has been found that for given parameters the correct, free of defects joints were obtained. The paper also presents the results of low-cycle fatigue tests of obtained FSW joints. The use of a ceramic tool in the FSW process allows to obtain welds with higher strength than conventional tools. The results suggests that FSW can be potentially applied to joining aluminum alloys.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1385-1394
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

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