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Wyszukujesz frazę "lift speed" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Selected parameters of the work of speed limiter in line straining system in a frictional lift
Autorzy:
Lonkwic, P.
Szydło, K.
Powiązania:
https://bibliotekanauki.pl/articles/101934.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
frictional lift
speed limiter
weight
Opis:
The article presents the analysis of selected work parameters of speed limiter in line straining system. We analyzed the effect of changing the geometrical conditions of the new solution for the speed limiter in line straining system upon the working conditions in frictional lift braking system. Within the conducted simulations of the work of the system, which is responsible for lift braking with a tension with spring, a test bed was prepared, which simulated the work of tension-rope-limiter system. The tests were performed in the conditions reflecting the work of a lifting appliance. Analyzing the results obtained through empirical calculations, we can conclude that there is a possibility of applying the spring to eliminate the weight.
Źródło:
Advances in Science and Technology. Research Journal; 2014, 8, 21; 73-77
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of external loading on lumbar extension moment during squat lifting
Autorzy:
Vahdat, Iman
Rostami, Mostafa
Tabatabai Ghomsheh, Farhad
Khorramymehr, Siamak
Tanbakoosaz, Ali
Powiązania:
https://bibliotekanauki.pl/articles/2161905.pdf
Data publikacji:
2017-06-19
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
electromyography
squat lifting
L5–S1 joint
extension moment
box weight
lift speed
Opis:
Objectives The main objective of this study has been qualitative investigation of the effects of external loading on the lumbar extension moment during squat lifting. Findings of this study may allow to determine the factor with the most considerable effect on the lumbar extension moment and may help determine the lumbar spine risk factors at temporo-spatial coordination during squat lifting. Material and Methods Twelve healthy men volunteered to perform slow and fast squat lifting of a box of varied mass (4 kg, 8 kg and 12 kg). The eight-channel electromyography was applied to detect the activities of abdominal (rectus abdominis and external oblique) and lower back muscles (iliocostalis lumborum and multifidus). The lumbar extension moment was calculated using 3D linked segment model. Ground reaction forces and kinematic data were recorded using a Vicon system with 2 parallel Kistler force-plates. Results Significant increases (both p-values < 0.05) were detected for the peak lumbar extension moment with increases in the lift speed and box weight. Moreover, a significant interaction (p = 0) was detected between the lift speed and box weight. Furthermore, insignificant differences (all p-values > 0.05) were detected between the lumbar angles related to the lower trunk muscles peak activities and lumbar angle related to the peak lumbar extension moment in most of the lifts. Conclusions According to the findings, the inertial force of the lifted box is the most important factor that affects the lumbar extension moment during squat lifting. Moreover, critical lumbar angles are seemingly those ones in which the lifted box reaches the peak acceleration. Int J Occup Med Environ Health 2017;30(4):665–679
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 4; 665-679
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of parameters of the stereolithography process on the part quality
Autorzy:
Lewiński, Tomasz
Kukiełka, Krzysztof
Chaciński, Tomasz
Jaskólski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2201645.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
SLA
stereolithography
3D scanning
process parameters
curing time
layer thickness
lift speed
stereolitografia
skanowanie 3D
parametry procesu
czas utwardzania
grubość warstwy
prędkość podnoszenia
Opis:
This paper investigates the effect of additive manufacturing parameters on the manufacturing quality of selected gear mechanism components. Three input variables, and two output variables were determined. The result was the determination of the most optimal combination of key parameters and the determination of regression equations. The concept of manufacturing objects of a very complex shape, by any person, under various conditions through the use of a low-cost device became the basis for this thesis topic. Curing time, layer thickness, and lift speed are among the basic parameters, with a large range of manipulation. A hypothesis was formulated that these three parameters are crucial to produce a part with the smallest possible deviations from the computer model. A handheld scanner was used to scan the samples and compare them with the CAD model. Based on the study, optimal parameters for layer thickness, curing time and lift speed were proposed.
Źródło:
Journal of Mechanical and Energy Engineering; 2022, 6, 2; 1--12
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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