Temat: crane trolley - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Adhesion Coefficient on the Limit of Slippage at Star-Up of the Manual Crane Trolley
Autorzy:: Hrabovský, Leopold
Mantič, Martin
Voštová, Věra
Powiązania:: https://bibliotekanauki.pl/articles/102891.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: coefficient adhesion
crane trolley
hoist
handling device
współczynnik przyczepności
wózek dźwigowy
wciągnik
urządzenie manipulacyjne
Opis:: Cranes are common handling devices used in construction, assembly and engineering plants. Bridge cranes with a suspended crane trolley (electric or manual operated hoist) are used in almost all engineering and service operations. The trouble-free operation of these devices depends on many factors; one of the parameters influencing the operation of crane trolleys (crane trucks) and crane bridges is adhesion. The presented paper describes the theoretical assumptions, experimental determination and verification of the coefficient of adhesion on the limit of slippage at starting of the manual crane trolley.
Źródło:: Advances in Science and Technology. Research Journal; 2019, 13, 2; 92-99
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Optimization of the trolley mechanism acceleration during tower crane steady slewing
Autorzy:: Loveikin, Viatcheslav S.
Romasevych, Yuriy O.
Loveikin, Andriy V.
Korobko, Mykola M.
Powiązania:: https://bibliotekanauki.pl/articles/27309857.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: trolley
optimization
movement
criteria
crane
wózek
optymalizacja
ruch
kryteria
dźwig
Opis:: The article describes optimization of the process of acceleration of the tower crane trolley movement mechanism during the steady mode of the slewing mechanism. A mathematical model of the boom system of the tower crane was used for the optimization of the trolley movement. The model was reduced to a sixth-order linear differential equation with constant coefficients, which represents the relationships between the drive torque and the coordinate of the load and its time derivatives. Non-dimensional complex criterion (objective function), which takes into account the drive torque and its rate of change in time during the transient process, was developed to optimize the mode of the trolley movement mechanism. Based on that, a variational problem was formulated and solved in an analytical form in which root-mean-square (RMS) values of the quantiles were applied. A complex optimal mode of acceleration of the trolley movement mechanism was obtained and compared with the modes optimized based on different criteria. Advantages and disadvantages of the solutions were discussed based on the analysis of the obtained optimal modes of motion. The analysis revealed low- and high-frequency elements oscillations of the trolley movement mechanism during the transient processes. The conditions for their elimination were formulated.
Źródło:: Archive of Mechanical Engineering; 2022, LXIX, 3; 411--429
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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