Temat: pendulum motion - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The application of a Hybrid III anthropomorphic dummy in testing personal fall arrest equipment
Autorzy:: Baszczyński, K.
Tematy:: anthropomorphic dummy
fall from height
pendulum motion
measurement of mechanical parameters; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/114296.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with measurement of the mechanical parameters describing fall arrest by personal protective equipment in situations where the user collides with a vertical structure as a result of a swing movement. The process of swing fall arrest is characterized and the scope of tests needed to obtain a description of such events from the point of view of user safety is delineated. The paper also presents the developed test method and experimental stand incorporating a Hybrid III 50th Pedestrian ATD anthropomorphic dummy. Preliminary test results concerning acceleration, force, moment of force, and dummy deformation are discussed. The results indicate that the designed method and experimental stand are well suited for the purpose. It has also been found that swing falls pose a serious hazard to PPE users.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A novel ultra-low-frequency micro-vibration calibration method based on virtual pendulum motion trajectories of the Stewart platform
Autorzy:: Ye, Tong
Liu, Zhihua
Cai, Chenguang
Bao, Fubing
Xu, Fei
Lian, Xiangkun
Tematy:: micro-vibration calibration
Stewart platform
ultra-low frequency
virtual pendulum motion trajectories; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/58973789.pdf Link otwiera się w nowym oknie
Opis:: Micro-acceleration generation during ultra-low-frequency micro-vibration calibration is a sensitive issue. There are issues of traditional pendulum tables being unable to change the pendulum radius and direction to produce micro-accelerations of different magnitudes, and the line shakers having a low signal-to-noise ratio when the vibration amplitude is the same as that of the pendulum tables. Therefore, a novel ultra-low-frequency micro-vibration calibration method is proposed to solve the above issues based on virtual pendulum motion trajectories of the Stewart platform. The micro-accelerations of 10-5 to 10-3 m/s2 can be generated by the trajectories with the radius of up to 12 m, the displacement amplitudes of up to 11.636 mm and the frequencies between 0.01 and 0.1 Hz. In the virtual pendulum motion, the maximum acceleration can be 2481 times greater than the acceleration of linear motion at the same frequency and displacement amplitude. In a comparison experiment with the current rotating platform, the maximum relative deviation of sensitivity amplitude calibration for pendulum motion around the x- and y-axis based on the Stewart platform are 0.411% and 0.295% respectively. The above results demonstrate the validity and reliability of this kind of method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Kołysanie, obrzędowe huśtanie się jako symboliczne reprezentacje ruchu wahadłowego (w świetle kognitywnych badań polskiego i wschodniosłowiańskiego folkloru)
Symbolic Representations of the Pendulum Movement (in Polish and East Slavic Folklore and Traditional Culture)
Autorzy:: Józefów-Czerwińska, Bożena
Masłowska, Ewa
Shved, Irena
Tematy:: symbolika ruchu wahadłowego
mit
rytualne huśtanie
kołysanie
ruch wahadłowy
magiczne praktyki
obrzędy przejścia
symbolism of pendulum movement
pendulum motion
rites de passage
magical practices with rocking
swaying
swinging
archaic beliefs
myth of creation
cosmic rhythms; Pokaż więcej
Wydawca:: Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:: https://bibliotekanauki.pl/articles/61650944.pdf Link otwiera się w nowym oknie
Opis:: This article is devoted to the symbolic representation of the pendulum movement, such as rocking, swaying and swinging. The research covered Polish and East Slavic folklore, ethnographic and linguistic material. The analysis aims to reach the conceptual basis of pendulum motion developed from the physical experience of movement and related events such as magical practices and rituals. To interpret the material, pre-linguistic conceptual schemas and narrative study, it uses tools to reconstruct the procedures of rites de passage. Examining the contexts and associations accompanying the magical activities of pendulum motion led to the disclosure of archaic beliefs that go back to the myth of creation. The broad spectrum of issues related to the performative power of rocking, swaying and swinging allowed us to present an embodied conceptualisation of the primary movement experience as the universal model of cosmic rhythms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Regular and chaotic vibrations of a preloaded pendulum system
Drgania regularne i chaotyczne napiętego wstępnie układu mechanicznego z wahadłem
Autorzy:: Warmiński, J.
Mitura, A.
Jankowski, K. P.
Tematy:: wibracje
ruchy chaotyczne
uderzenie
vibration
chaotic motion
impact
pendulum system; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281794.pdf Link otwiera się w nowym oknie
Opis:: Vibrations of a single preloaded pendulum, with the impact phenomenon with a stop taken into account, are analysed in the paper. The model, under some simplification, represents a simple one-degree-of-freedom element of a vehicle latch system. The response of the system has been tested numerically for a wide range of parameters and with various excitation amplitudes and frequencies. Elastic and rigid impacts have been studied, and results for both impact models and for regular and chaotic motions have been compared. To find all possible solutions to the system, basins of attraction have been calculated as well. The final verification of the model response has been presented for the experimental signals recorded during vehicle side impact tests. It has been shown that the response of the latch element under study may lead to door opening, and that is why it has to be replaced with another design.
W niniejszej pracy przedstawiono drgania pojedyńczego wahadła fizycznego napiętego wstępnie sprężyną, z uwzględnieniem możliwości zjawiska uderzenia w ogranicznik ruchu. Rozważany układ reprezentuje prosty model jednego z elementów mechanizmu zamykania drzwi pojazdu samochodowego. Zbadano numerycznie odpowiedź układu dla sztywnego i lepko-sprężystego modelu uderzenia w szerokim zakresie wymuszeń harmonicznych. Porównano dla obu modeli uderzenia obszary występowania ruchu regularnego i chaotycznego. Przeprowadzono również analizę obszarów przyciągania rozwiązań, określając wszystkie możliwe rozwiązania systemu. Końcową weryfikację odpowiedzi układu przeprowadzono dla sygnału eksperymentalnego, zarejestrowanego podczas próby bocznego zderzenia pojazdów. Pokazano, ze odpowiedź mechanizmu może doprowadzić do otwarcia drzwi pojazdu i dlatego inne rozwiązanie techniczne powinno zostać użyte.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Chaotic motion of a multi-articulated tower immersed in waving fluid: numerical experiment
Autorzy:: Uściłowska, A.
Kołodziej, J. A.
Tematy:: multi-articulated tower
inverted pendulum
multi-potential system
equilibrium positions
multi-periodic motion
chaotic motion; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1986964.pdf Link otwiera się w nowym oknie
Opis:: The offshore structures, such as multi-articulated towers, manipulators working in waving fluid are more and more popular structures. Commonly they are modelled as an inverted pendulum. The motion of such tower immersed in waving fluid is under consideration. It is assumed that the tower is hinged to the seabed by the hinge with friction. The joint of tower elements is the hinge with friction, as well. Motion of tower loaded by regular wave fluid force is considered. The numerical experiment shows that the multi-potential systems may move chaotically for some parameters of the tower and the fluid.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Influence of vertical ground motion on seismic responses of triple friction pendulum interlayer isolation structures
Autorzy:: Fang, Zhao
Yan, Ping
Tematy:: ruch gruntu pionowy
struktura
izolacja międzywarstwowa
odpowiedź sejsmiczna
wahadło z potrójnym tarciem
vertical ground motion
interlayer isolation
structure
seismic response
triple friction pendulum; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1852324.pdf Link otwiera się w nowym oknie
Opis:: In order to investigate the influence of vertical ground motion on seismic responses of story-isolation structures mounted on triple friction pendulum (TFP) bearings, the finite element model of a six-story building with various types of interlayer isolation TFP bearings under far field or near fault ground motions is established and analysed. A discrepancy rate function of peak interlayer shear, acceleration and displacement results is adopted to discuss the influence of the vertical seismic motions on isolation structural responses. Furthermore, the isolation form, the isolation period and the friction coefficient of bearings are changed to study their effect on the vertical seismic component’s influence. The results show that the influence of the vertical seismic component is considerable on the isolation layer especially under near-fault ground motions, so it should not be overlooked during the structural design; The change of isolation forms will greatly affect the influence of the vertical seismic component especially in the isolation layer and isolation systems with isolation devices set on higher stories or with less isolation layers will have less vertical seismic effect on story acceleration; The increase of the isolation period will globally result in the decrease of the influence of vertical seismic components, though in some cases it shows some sort of fluctuation before the final decrease; The increase of the friction coefficient will lead to the global decrease in the influence of the vertical seismic component in single-layer isolation structures, while it does not obviously affect those in the multi-layer isolation systems.
Dostawca treści:: Biblioteka Nauki

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