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Tytuł:
Dual manipulator system calibration based on virtual constraints
Autorzy:
Zhu, Q.
Xie, X.
Li, C.
Powiązania:
https://bibliotekanauki.pl/articles/200227.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dual manipulators
calibration
virtual constraint
optical axis
robot-robot
hand-eye
Opis:
Calibration is necessary for dual manipulator to complete operational tasks. This paper proposes an effective robot-robot and hand-eye calibration method based on virtual constraints. Firstly, a rotational error model and a translational error model are established based on the relationships between the transformation matrices of the dual manipulator calibration system. Then a poses-alignment method is designed to make the poses of the two robots satisfy the constructed virtual constraints. At the aligned positions, the joint angles of the two robots are saved and used to calculate the values of the variables in the error models. Finally, the robot-robot and hand-eye rotational errors are estimated by an iterative algorithm. These errors are then used to calculate translational errors based on the SVD (singular value decomposition) method. To show the feasibility and effectiveness of the proposed method, experiments of robot-robot and hand-eye calibration for dual manipulators are performed. The experiment results demonstrate that the accuracy of the dual manipulator system is improved greatly.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1149-1159
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Metal Derivatives of 1,1,2,2-Tetranitraminoethane (TNAE)
Autorzy:
Zhu, C.
Meng, Z.
Xu, Z.
Liu, W.
Liu, Y.
Shi, X.
Xie, T.
Powiązania:
https://bibliotekanauki.pl/articles/358571.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
Ionic compound
1,1,2,2-tetranitraminoethane
thermal property
safety performance
thermal decomposition kinetics
Opis:
The introduction of anions and cations into energetic materials can significantly improve their physicochemical and energetic properties. The K, Zn, Ba, Cu and Pb salts of 1,1,2,2-tetranitraminoethane (TNAE) were synthesized using TNAE as the starting material, and were characterized by IR spectroscopy, NMR spectroscopy and elemental analysis. All of the energetic salts exhibited relatively high thermal stabilities (decomposition temperatures ranging from 195.1 °C to 279.3 °C) and high densities (ranging from 2.1 g·cm–3 to 3.7 g·cm–3). It was demonstrated that the introduction of metal ions conveys better thermal stability than covalent TNAE itself. More importantly, the Zn, Ba and Cu salts exhibited good thermal stability, high density, low sensitivity, and therefore have the potential to be a new class of insensitive, highly energetic explosives for practical applications.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 3; 435-444
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Common mycelium networks with Paraglomus occultum induce better plant growth and signal substance changes between trifoliate orange seedlings
Autorzy:
Zhang, Y.-C.
Xie, M.-M.
Feng, H.-D.
Zhou, M.
Zhang, Z.Z.
Liu, C.-Y.
Wu, Q.-S.
Powiązania:
https://bibliotekanauki.pl/articles/11877054.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Mycorrhizal mycelium can simultaneously colonize two and more neighboring plants to form common mycelium network (CMNs), whereas the information regarding CMN effects on endogenous signal substances is limited. In this study, a rootbox was separated by 37- or 0.45-μm mesh to establish donor chamber (the presence of roots and hyphae) and receptor (hyphae presented or not, free of roots) chamber, where an arbuscular mycorrhizal (AM) fungus Paraglomus occultum was inoculated into trifoliate orange seedlings of donor chamber to illustrate the underground communications of signal substances by CMNs. Mycorrhizal colonization resulted in better plant growth performance and greater root morphology in donor and receptor plants. AM inoculation increased significantly the root nitric oxide (NO) and calmodulin (CaM) levels of donor plants, regardless of 37- and 0.45-μm mesh, and subsequent CMNs induced higher root NO and CaM levels in receptor plants. Mycorrhizal colonization did not produce significant changes in root zeatin riboside (ZR) levels of donor plants, but CMN hyphae modulated lower root ZR levels of receptor plants. Mycorrhizal inoculation and subsequent CMN hyphae induced lower root gibberellin levels of donor and receptor plants, and only CMN hyphae produced lower root methyl jasmonate concentrations of receptor plants. Our results first reveal the underground communication of CaM, NO, and ZR by CMNs with P. occultum between trifoliate orange seedlings.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2018, 17, 6; 95-104
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of float-sink and progressive release flotation of ground products of coal middlings
Autorzy:
Xie, W.
He, Y.
Luo, C.
Zhang, X.
Li, H.
Yu, J.
Wang, H.
Shi, F.
Powiązania:
https://bibliotekanauki.pl/articles/109500.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal middlings
float-sink
progressive release flotation
XPS
EDX
Opis:
An additional recovery of coking coal middlings can be utilized for increasing of the concentrate yield of coking coal. A combined flow sheet of comminution and flotation can realize this target. To investigate the effect of grinding process on further flotation of ground products, progressive release flotation tests were used to compare with the float-sink tests, which were regarded as a criterion. Coal middlings were ground by wet-milling with iron balls to <0.5 mm. Curves of ash vs. cumulative yields of sized products indicated that the concentrate yield of coal separated by progressive release flotation was lower than that of coal benefited by the float-sink test, with the same ash for four size fractions (0.5-0.25 mm, 0.25-0.125 mm, 0.125-0.074 mm and <0.074 mm). Distributions of elements conducted by energy disperse spectroscopy (EDX) showed that associated kaolinite was liberated and exposed on the surface. It led to the shift of local surface property from hydrophobicity to hydrophilicity. Meanwhile, analyses of chemical property performed by an X-Ray photoelectron spectrometer (XPS) depicted that the hydrophilic mineral FeOOH, which generated in the grinding process, was adsorbed on the coal surface. Flotation of the ground products were worsened due to the increase of hydrophilicity of the coal surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 675-684
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decay Kinetics from $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ State of Mixed 2,6 Pyridine Dicarboxylate-Acetylacetonate Complexes
Autorzy:
Xie, R.-Q.
Flint, C. D.
Powiązania:
https://bibliotekanauki.pl/articles/1945621.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
13.40.Hq
31.70.Ie
78.55.Hx
Opis:
The $\text{}^{4}$I $\text{}_{9}\text{}_{/}\text{}_{2}$ → $\text{}^{4}$I $\text{}_{15}\text{}_{/}\text{}_{2}$ luminescence decay curves for a series of complexes Er(pdc)$\text{}_{n}$(acac)$\text{}_{3-n}$ (pdc = pyridine-2,6-dicarboxylate, acac = acetylacetonate, n = 0, 1, 2, 3) as solids and in dilute aqueous solutions have been investigated. The decays are multiexponential, possible reasons for this and for the short lifetimes observed are discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 323-325
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of finite element meshing accuracy on a welding machine for offshore platform’s modal analysis
Autorzy:
Xie, J.
Sun, D.
Xu, C.
Wu, J.
Powiązania:
https://bibliotekanauki.pl/articles/260126.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
finite element analysis
meshing
meshing accuracy
modal analysis
Opis:
The purpose objective of this study was to investigate the influence of finite element meshing accuracy on modal analysis which is one of the basic factors affecting the accuracy of finite element analysis and mostly preoccupies the working staff in pre-processing finite element simulation models. In this paper, we established several finite element models of a welding machine for offshore platform, with the meshing accuracy as the variable and workbench software as the platform for modal analysis, as the same time, comparing the analysis results. The results indicated that for some specific structures and simulation types, mesh refinement alone does not achieve desired results, and the authors indicate that mesh refinement is rarely related to the equipment’s low-frequency modal analysis but it’s great related to the equipment’s high-frequency modal analysis. The findings of this study may serve as breaking the opinion that smaller mesh size means higher calculation precision and provides references for mesh division practices in low frequency modal analysis.
Źródło:
Polish Maritime Research; 2018, S 3; 147-153
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameter calibration for the discrete element simulation model of commercial organic fertilizer
Autorzy:
Xie, C.
Yang, J.
Wang, B.
Zhuo, P.
Li, C.
Wang, L.
Powiązania:
https://bibliotekanauki.pl/articles/2082983.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
commercial organic fertilizer
discrete element
repose angle
parameter calibration
parameters for the particle
model
Opis:
The parameters of a discrete element simulation model for commercial organic fertilizer particles were obtained both quickly and accurately, so that the uniformity and stability of the fertilizer discharged from the feeder may be studied using the discrete element simulation method. This study screened out the parameters which significantly influenced the repose angle of the commercial organic fertilizer using the Plackett-Burman test. Then, a model for the quadratic regression response surface of the repose angle vs the parameters was established through a Box-Behnken experiment with the measured repose angle of the fertilizer particles as the optimization index. The optimization results showed that the rolling friction coefficient and static friction coefficient between the fertilizer particles, as well as the optimal simulation parameter for the Johnson-Kendall-Roberts surface energy were 0.056, 0.355 and 0.011 J m-2, respectively. A discrete element simulation test was carried out with the optimal simulation parameters, and the repose angle error of the simulation test was found to be 0.40% relative to that of the physical test, which proved the accuracy and validity of the simulation parameters for the discrete element model of the organic fertilizer. The simulation results may provide the basic parameters for establishing a discrete element model of commercial organic fertilizer particles and investigating the performance of organic fertilizer feeders using the simulation method.
Źródło:
International Agrophysics; 2021, 35, 1; 107-117
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the flotation kinetic of bituminous coal before and after natural weathering processes
Autorzy:
Xia, W.
Peng, Y.
Ren, C.
Xie, G.
Liang, C.
Powiązania:
https://bibliotekanauki.pl/articles/951864.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation kinetic
classical first-order rate constant
natural weathering processes
XPS
contact angle
Opis:
Natural weathering processes can make coal surface more hydrophilic due to the increase of content of hydrophilic functional groups (C-O, C=O, and COOH) and the decrease of content of hydrophobic functional groups (C-C and C-H) on coal surface, and hence the flotation recovery of fine coal is reduced. In this paper, a series of flotation tests were conducted in order to investigate the changes in the flotation kinetic of bituminous coal before and after natural weathering processes. Additionally, XPS was used to indicate the changes in surface properties of bituminous coal. In the investigations the flotation kinetic was changing. The classical first-order rate constant (k) of bituminous coal flotation was reduced after the natural weathering processes. A relationship between the classical first-order rate constant (k) and the hydrophilicity ability (HA) was given.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 401-410
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new basal actinopterygian fish from the Anisian (Middle Triassic) of Luoping, Yunnan Province, Southwest China
Autorzy:
Wen, W.
Zhang, Q.-Y.
Hu, S.-X.
Zhou, C.-Y.
Xie, T.
Huang, J.-Y.
Chen, Z.Q.
Benton, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/21811.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
actinopterygian fish
fish
Anisian
Middle Triassic
Luoping
Yunnan Province
China
Actinopterygii
Halecomorphi
Triassic
Opis:
The new neopterygian fish taxon Luoxiongichthys hyperdorsalis gen. et sp. nov. is established on the basis of five specimens from the second member of the Guanling Formation (Anisian, Middle Triassic) from Daaozi Quarry, Luoping, Yunnan Province, Southwest China. The new taxon is characterized by the following characters: triangular body outline with a distinct apex located between skull and dorsal fin; free maxilla; slender preopercular almost vertical; three suborbitals; at least eight strong branchiostegals with tubercles and comb−like ornamentation on the anterior margin; clavicles present; two postcleithra; ganoid scales covered by tubercles and pectinate ornamentation on the posterior margin with peg−and−socket structure; hemiheterocercal tail slightly forked. Comparison with basal actinopterygians reveals that the new taxon has parasemionotid−like triangular symplectics, but a semionotid opercular system. Cladistic analysis suggests that this new genus is a holostean, and either a basal halecomorph or basal semionotiform.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a blocking immunoperoxidase monolayer assay for differentiation between pseudorabies virus-infected and vaccinated animals
Autorzy:
Wang, Y.B.
Li, Y.H.
Li, Q.M.
Xie, W.T.
Guo, C.L.
Guo, J.Q.
Deng, R.G.
Zhang, G.P.
Powiązania:
https://bibliotekanauki.pl/articles/2087396.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pseudorabies virus variant strains
anti-pseudorabies virus monoclonal antibody
blocking immunoperoxidase monolayer assay
differentiation between pseudorabies virus-infected and vaccinated animals
Źródło:
Polish Journal of Veterinary Sciences; 2019, 4; 717-723
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A fully coupled solid and fluid model for simulating coal and gas outburst with DEM and LBM
W pełni zintegrowany model oddziaływania pomiędzy cieczą a ciałem stałym do symulacji wyrzutów węgla i gazu metodą elementów dyskretnych i metodą siatkową Boltzmanna
Autorzy:
Wang, Y. C.
Xue, S.
Xie, J.
Powiązania:
https://bibliotekanauki.pl/articles/348657.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
wyrzut węgla i gazu
oddziaływanie ciecz-ciało stałe
metoda elementów dyskretnych
metoda siatkowa Boltzmanna
coal and gas outbursts
solid-fluid coupling
Discrete Element Method
lattice Boltzmann method
Opis:
In this paper, we present a fully coupled solid-fluid code which is developed to model the whole process of coal and gas outbursts. The Discrete Element Method is used to model the deformation and fracture of solid, while Lattice Boltzmann Method models fluid flow, including free flow and Darcy flow. These two methods are coupled in a two-way process: the solid part provides a moving boundary condition and transfers momentum to the fluid, and the fluid exerts a dragging force to the solid. Gas desorption occurs at solid-fluid boundary, and gas diffusion is implemented in the solid code where particles are assumed as porous material. Some preliminary simulations are carried out to validate the code.
W niniejszej publikacji prezentujemy w pełni zintegrowany kod oddziaływania pomiędzy cieczą a ciałem stałym, opracowany do modelowania całego procesu wyrzutów węgla i gazu. Metoda elementów dyskretnych stosowana jest do modelowania deformacji i pęknięcia ciała stałego, podczas gdy metoda siatkowa Boltzmanna - do modelowania przepływu cieczy, w tym przepływu swobodnego i przepływu zgodnie z prawem Darcy'ego. Te dwie metody połączone są w procesie dwukierunkowym: część stała zapewnia warunki ruchomej granicy rozdziału, przenosząc pęd do cieczy, a ciecz wywiera opór na ciele stałym. Desorpcja gazu występuje na granicy oddziaływania pomiędzy cieczą a ciałem stałym, a do rozproszenia gazu dochodzi w kodzie ciała stałego, gdzie cząsteczki traktowane są jako materiał porowaty. Prowadzone są wstępne symulacje w celu sprawdzenia poprawności kodu.
Źródło:
AGH Journal of Mining and Geoengineering; 2012, 36, 3; 377-384
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermally induced damage in hexanitrohexaazaisowurtzitane
Autorzy:
Tian, Q.
Yan, G.
Sun, G.
Huang, C.
Xie, L.
Chen, B.
Huang, M.
Li, H.
Liu, X.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/358735.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
CL-20
SAXS
AFM
thermal effects
voids
Opis:
The evolution of the microstructure of hexanitrohexaazaisowurtzitane (CL-20) after a thermal stimulus plays a key role in the performance of CL-20. In the current work, microstructural variations of CL-20 caused by thermal treatment were investigated by X-ray diffraction, in situ variable-temperature optical microscopy, atom force microscopy, and small-angle X-ray scattering. A wave-like process, an abrupt volume expansion, movement, and fragmentation of CL-20 particles during phase transition were observed. After the phase transition (160 °C) the CL-20 sample acquired a very rough surface with numerous dimple depressions, and during the thermal decomposition stage (200 °C) a large number of voids were produced in both the bulk and the surface of the CL-20.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 3; 359-369
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Signal Subspace Speech Enhancement Approach Based on Joint Low-Rank and Sparse Matrix Decomposition
Autorzy:
Sun, C.
Xie, J.
Leng, Y.
Powiązania:
https://bibliotekanauki.pl/articles/177990.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
subspace speech enhancement
singular value decomposition
joint low-rank and sparse matrix decomposition
Opis:
Subspace-based methods have been effectively used to estimate enhanced speech from noisy speech samples. In the traditional subspace approaches, a critical step is splitting of two invariant subspaces associated with signal and noise via subspace decomposition, which is often performed by singular-value decomposition or eigenvalue decomposition. However, these decomposition algorithms are highly sensitive to the presence of large corruptions, resulting in a large amount of residual noise within enhanced speech in low signal-to-noise ratio (SNR) situations. In this paper, a joint low-rank and sparse matrix decomposition (JLSMD) based subspace method is proposed for speech enhancement. In the proposed method, we firstly structure the corrupted data as a Toeplitz matrix and estimate its effective rank value for the underlying clean speech matrix. Then the subspace decomposition is performed by means of JLSMD, where the decomposed low-rank part corresponds to enhanced speech and the sparse part corresponds to noise signal, respectively. An extensive set of experiments have been carried out for both of white Gaussian noise and real-world noise. Experimental results show that the proposed method performs better than conventional methods in many types of strong noise conditions, in terms of yielding less residual noise and lower speech distortion.
Źródło:
Archives of Acoustics; 2016, 41, 2; 245-254
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convergence Point of Three-strand Yarn Spinning
Punkt zbieżności przy przędzeniu przędz trójtaśmowych
Autorzy:
Su, X.
Gao, W.
Liu, X.
Xie, C.
Huang, B.
Powiązania:
https://bibliotekanauki.pl/articles/232053.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
three-strand yarn spinning
theoretical model
convergence point
przędzenie przędz trójtaśmowych
model teoretyczny
punkt zbieżności
Opis:
A theoretical model for the three-strand yarn spinning system is obtained by using the analysis method for the two-strand case presented by He et al. and setting a series of virtual intermediate variables. Then the convergence point of the three-strand yarn spinning is obtained by eliminating the intermediate variables.
Opracowano teoretyczny model systemu przędzenia trójtaśmowej przędzy z wykorzystaniem modelu przędzy dwutaśmowej przedstawionego przez He i innych. Wprowadzono serię teoretycznych zmiennych przejściowych, a następnie ustalono punkt zbieżności dla systemu przędzenia przędzy trójtaśmowej przez eliminacje zmiennych pośrednich.
Źródło:
Fibres & Textiles in Eastern Europe; 2013, 3 (99); 48-50
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Simulation of Fibre Tension in an Asymmetric Ring Spinning Triangle Using FEM
Numeryczna symulacja naprężeń włókien przy asymetrycznym trójkącie przędzenia w systemie przędzenia obrączkowego
Autorzy:
Su, X.
Gao, W.
Qin, X.
Liu, X.
Xie, C.
Powiązania:
https://bibliotekanauki.pl/articles/233077.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
fibre tension
fibre torque
ring spinning asymmetric triangle FEM
naprężenie włókien
włókno
trójkąt przędący
moment obrotowy
pierścień przędzenia
Opis:
In the paper, numerical simulations of fibre tension in one kind of asymmetric ring spinning triangle caused by horizontal offsets of the twisting point is studied by using the finite element method (FEM). A finite element model of the asymmetric ring spinning triangle is first established according to the mechanical properties of the fibre and a geometric model of the spinning triangle. Then the distribution of fibre tension and fibre torque in the asymmetric spinning triangle with and without considering fibre buckling are simulated by using ANSYS software. Effects of the offsets on the distribution of fibre tension and torque in the spinning triangle are studied in detail. The results show that with an increase in the spinning triangle offset, the asymmetric trend of fibre tension distribution in the spinning triangle is more obvious, and the value of fibre tension is also increased, whereas the fibre torque is decreased. Meanwhile with an increase in the yarn twist factor, the value of fibre tension and torque are both greatly increased. In addition, compared with the case where fibre buckling is considered, fibre tensions and torques are considerably increased in the case where fibre buckling is not considered.
Badano naprężenie włókien powodowane horyzontalnym przesunięciem punktu skrętu. Zastosowano metodę elementów skończonych. Opracowano model asymetrycznego trójkąta uwzględniając mechaniczne właściwości włókien i geometrię utworzoną przez trójkąt przędący. Opracowano rozkład naprężeń i momentów obrotowych włókien przy i bez uwzględnienia wyboczenia włókien. Zastosowano program ANSYS. Wyniki wskazują, że ze wzrostem przesunięcia w trójkącie przędzenia wpływ asymetrii jest bardziej uwidoczniony. Stwierdzono również, że ze wzrostem naprężenia włókien zmniejsza się moment obrotowy. Jednocześnie zaobserwowano, że ze wzrostem współczynnika skrętu wartość naprężeń oraz momentu znacznie wzrasta. Stwierdzono również istotny wpływ wyboczenia włókien.
Źródło:
Fibres & Textiles in Eastern Europe; 2016, 6 (120); 81-87
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 30

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