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Wyświetlanie 1-15 z 67
Tytuł:
Prediction of transport vehicles’ durability with consideration of corrosive surface cracks propagation in structural elements
Autorzy:
Droździel, P.
Popovych, P.
Vitenko, T.
Shevchuk, O.
Zolotyi, R.
Kononchuk, O.
Powiązania:
https://bibliotekanauki.pl/articles/198683.pdf
Data publikacji:
2018
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
structure element
surface cracks
kinetic diagrams
crack propagation
corrosive-fatigue crack
durability of vehicle
element konstrukcji
pęknięcia powierzchni
diagram kinetyczny
propagacja pęknięć
pęknięcia korozyjno-zmęczeniowe
obciążenie pojazdu
Opis:
Support frameworks of transport vehicles operate under varying terrain conditions under the influence of extreme climate and corrosive environments. When transporting cargo, dust is deposited on the surface of metal structures. The combination of dust and moisture creates an aggressive environment resulting in intense corrosion damage. The damage is caused by the defects of corrosion pitting, which occur on the surface and transform into corrosion cracks. Based on energy approaches, with the application of well-known results for the mathematical description of electrochemical reactions and the principles of fragile fracture mechanics, an analytical model of durability is proposed for the first time. The model determines the residual life of maximum loaded elements of undercarriages with surface cracks under the action of dynamic loads and corrosive environments. For this case, a set of mathematical relations in the form of a non-linear differential equation was developed, as well as the initial and final conditions for determining the life of vehicles’ structural elements with corrosive surface cracks. The analytical model implementation is proven by solving the problem of determining the residual life of a vehicle’s element, i.e., a steel plate, weakened by a semi-elliptical surface crack, which is under the action of dynamic loads in a 3% sodium chloride solution. The insignificant increase in the crack’s initial size is proven to greatly reduce the period of its subcritical growth. The developed model was applied to define the residual life of thin-walled elements of structures with surface cracks.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 101; 47-57
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM-BEM coupling in the membrane structure-air interaction problem
Połączenie MES i MEB w zagadnieniach interakcji powłok membranowych i powietrza
Autorzy:
Sygulski, R.
Powiązania:
https://bibliotekanauki.pl/articles/281304.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
finite element method
boundary element method
membrane structure
Opis:
This paper deals with the interaction problems between the lightweight membrane structure and surrounding air. The coupling of FEM and BEM is described and applied to analysis of aerodynamics of membrane structures. Three methods of FEM-BEM coupling are presented.
Praca dotyczy problemów interakcji lekkich przekryć membranowych i otaczającego powietrza. Omawia się połączenie metody elementów skończonych (MES) i metody elementów brzegowych (MEB) do analizy zagadnień aerodynamiki powłok membranowych. Przedstawiono trzy metody połączenia MES i MEB.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 2; 513-520
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and function of RNA elements present in enteroviral genomes
Autorzy:
Dutkiewicz, Mariola
Stachowiak, Aleksandra
Swiatkowska, Agata
Ciesiołka, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1038713.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Enterovirus
poliovirus
coxsackievirus B3
RNA structure
structural RNA element
cis-acting element
Opis:
Enteroviruses are small RNA(+) viruses that encode one open reading frame flanked by two extensive noncoding regions carrying structural RNA regulatory elements that control replication and translation processes. For a long time the central, coding region was thought to remain single-stranded and its only function was supposed to be as the template for polyprotein synthesis. It turned out, however, that the protein coding region also encodes important RNA structures crucial for the viral life cycle and virus persistence in the host cells. This review considers the RNA structures in enteroviral genomes identified and characterized to date.
Źródło:
Acta Biochimica Polonica; 2016, 63, 4; 623-630
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scaled Soil-Structure Interaction Model for Shaking Table Testing
Autorzy:
Goktepe, F.
Omid, A.
Celebi, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031921.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Soil-structure interaction
shaking table
finite element analysis
Opis:
The primarily goal of this study is to reveal a scaled soil-structure interaction model for small capacity shaking table testing instead of the full-scale field experiments. The prototype of soil-structure interaction system with frame-type building, resting on a sandy soil with shear wave velocity of 536 m/s and unit weight of 12.9 kN/m³ has been selected. For experimental investigations, the realistic site and building structures are scaled with a geometric scaling factor of 1:45. The test model, consisting of six-story steel frame-type building, natural soil and laminar soil container, is designed and constructed to realistically simulate the seismic soil-structure interaction effects of building structures in shaking table tests. In order to verify the geometric scaling factor, the dynamic properties of the fixed-base system for both prototype and scaled model are determined by using finite element analysis. Furthermore, the dynamic parameters for scaled model of a single layer soil, restricted with base-rock, have been compared numerically with the proposed laminar soil container, to provide a good agreement.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 588-590
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational analysis of statics and dynamics of complex structures by finite element method
Analiza komputerowa statyki i dynamiki konstrukcji złożonych metodą elementów skończonych
Autorzy:
Weber, H.
Hien, T. D.
Powiązania:
https://bibliotekanauki.pl/articles/151573.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
konstrukcja złożona
dynamika
tłumienie Rayleigha
element skończony
complex structure
dynamics
Rayleigh's damping
finite element
Opis:
A finite element model of complex structures is formulated in the paper. Equations of motion are presented. The material and geometrical input data of a suspended bridge, modeled as a cable-beam-shell system, is described and the impact-type loading is assumed. Structural and computational aspects of the system at hand are discussed in detail via illustrating numerical results.
W pracy sformułowano model elementów skończonych dla konstrukcji złożonych. Zaprezentowano układ równań ruchu. Opisano materiałowe i geometryczne dane wejściowe dotyczące przykładowego mostu podwieszonego, zamodelowanego jako układ kablowo-belkowo-powłokowy. Przyjęto obciążenie dynamiczne typu nagłego uderzenia. Aspekty konstrukcyjne oraz komputerowe rozpatrywanego układu przedyskutowano szczegółowo przez ilustrujące wyniki liczbowe.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 6, 6; 357-360
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach for obtaining the geometric properties of a granular porous bed based on DEM simulations
Autorzy:
Sobieski, W.
Dudda, W.
Lipiński, S.
Powiązania:
https://bibliotekanauki.pl/articles/297977.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
granular beds
spatial structure
Discrete Element Method
PathFinder code
Opis:
In the article, a new way for obtaining a set of geometrical parameters of granular porous beds is presented, if the data on the locations and sizes of all particles is available. The input data were prepared with the use of Discrete Element Method. The other way for acquiring the input data may be the application of Computed Tomography (CT) and Image Analysis (IA) techniques. All geometrical parameters are calculated with the use of own numerical code called PathFinder (freely available in the Internet together with its source code). In addition to description of the method of calculations, two examples of its use are presented. One simulation was performed in PFC3D code, and the other in YADE software. The aim of the article was to show clearly that a porosity is not sufficient to describe the spatial structure of a porous body. In both presented examples, the porosity value is almost the same, but other parameters, e.g. tortuosity, are different. The motivation to write the PathFinder code were significant problems with obtaining geometrical parameters needed in investigations related to granular porous media. The issues described in the article are a part of an overall research methodology relating to the linking the micro- and macro-scale investigations of granular porous beds. The areas of applications of this methodology are not discussed in the article.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(2); 165-187
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element simulations of floating ice - engineering structure interactions
Autorzy:
Staroszczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/240982.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
finite element simulations
floating ice cover
rigid engineering structure
Opis:
In this paper the problem of interaction between a coherent floating ice cover and a rigid engineering structure is considered. It is assumed that the ice cover, of horizontal dimensions considerably larger than the dimensions of the structure, is driven by wind and water current drag forces. During the interaction process of a quasi-static character, ice is assumed to behave as a creeping material, with a rheology described by the viscous fluid flow law. The ice cover is treated as a plate which sustains both bending due to the vertical reaction of the underlying water and the action of horizontal forces, which gives rise to the development of creep buckles in the plate and subsequently leads to the flexural failure of ice. An approximate solution to the problem is constructed by employing the finite element method. The results of numerical simulations illustrate the magnitudes of the forces exerted on the structure and their dependence on the wind direction and the structure geometry. In addition, the ice plate deflection in the vicinity of the structure is illustrated, and the values of the critical time at which the plate starts to fail by creep buckling are determined to show their dependence on the ice thickness, temperature, and type.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 3; 251-268
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regulation of alternative splicing by RNA secondary structure
Autorzy:
Lisowiec, J.
Dominiak, G.
Kierzek, R.
Powiązania:
https://bibliotekanauki.pl/articles/79823.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alternative splicing
cis-acting element
trans-acting factor
RNA secondary structure
regulatory element
splicing factor
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2014, 95, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulations and tests of composite marine structures under low-velocity impact
Autorzy:
Zhu, Zhaoyi
Li, Xiaowen
Chen, Qinglin
Cai, Yingqiang
Xiong, Yunfeng
Powiązania:
https://bibliotekanauki.pl/articles/1573692.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
low-velocity impact
marine structure
composites
test
finite element analysis
Opis:
Due to their excellent performance, composite materials are increasingly used in the marine field. It is of great importance to study the low-velocity impact performance of composite laminates to ensure the operational safety of composite ship structures. Herein, low-velocity drop-weight impact tests were carried out on 12 types of GRP laminates with different layup forms. The impact-induced mechanical response characteristics of the GRP laminates were obtained. Based on the damage model and stiffness degradation criterion of the composite laminates, a low-velocity impact simulation model was proposed by writing a VUMAT subroutine and using the 3D Hashin failure criterion and the cohesive zone model. The fibre failure, matrix failure and interlaminar failure of the composite structures could be determined by this model. The predicted mechanical behaviours of the composite laminates with different layup forms were verified through comparisons with the impact test results, which revealed that the simulation model can well characterise the low-velocity impact process of the composite laminates. According to the damage morphologies of the impact and back sides, the influence of the different layup forms on the low-velocity impact damage of the GRP laminates was summarised. The layup form had great effects on the damage of the composite laminates. Especially, the outer 2‒3 layers play a major role in the damage of the impact and the back side. For the same impact energy, the damage areas are larger for the back side than for the impact side, and there is a corresponding layup form to minimise the damage area. Through analyses of the time response relationships of impact force, impactor displacement, rebound velocity and absorbed energy, a better layup form of GRP laminates was obtained. Among the 12 plates, the maximum impact force, absorbed energy and damage area of the plate P4 are the smallest, and it has better impact resistance than the others, and can be more in line with the requirements of composite ships. It is beneficial to study the low-velocity impact performance of composite ship structures.
Źródło:
Polish Maritime Research; 2021, 1; 59-71
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic analysis of the aortic valve functioning
Autorzy:
Patralski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1839626.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
aortic valve
algorithm ALE
fluid-structure interaction
finite element analysis
Opis:
The aim of the paper was to recognize the influence of mechanical factors on the movement of the leaflets. Mechanical stimuli may have a positive effect on remodeling the leaflet material to adapt its structure to a changing load. A model of the valve functioning process was developed. A geometric model similar to the construction of a natural valve was adopted. The hybrid process of the liquid-solid interaction problem was described. The interaction process was modeled. The problem was formulated with the Galerkin FEM method. Numerical analyses of a single valve work cycle and the calcification process of aortic valve bioprostheses were performed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 853-869
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic loads on the roof plate of the wheeled carrier during the firing of a 30 mm cannon
Autorzy:
Wiśniewski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2200808.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
finite element method
armoured personnel carrier
shock load
structure
stresses
Opis:
On the battlefield, modern vehicles perform a variety of roles. Transportation is one of the most fundamental. Operating in different terrains, including urban areas, means exposing the crew to different hazards. To increase crew protection, passive and active protection systems are used. On the other hand, in addition to protection, support of the infantry in offensive operations is an equally important activity. The most common solution for medium wheeled vehicles is a manned turret. The weapon is a 30 mm cannon. Nowadays, there is a trend towards installing systems that allow such weapons to be operated remotely. This minimises the exposure of highly trained personnel. This paper presents the results of a numerical study of the dynamic loads on the roof-plate structure of a wheeled armoured personnel carrier resulting from the firing of the vehicle's main armament. It includes the values of the strains and stresses in the upper plate structure and the forces transmitted by the brackets connecting the roof plate to the bottom plate, and an assessment of the risk of using such a system on the safety of the vehicle structure and its crew.
Źródło:
Archiwum Motoryzacji; 2023, 99, 1; 53--65
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical elements of heritage buildings: study of the Kadariah Palace in Pontianak City, West Kalimantan
Elementy fizyczne obiektów zabytkowych. Studium pałacu Kadariah w mieście Pontianak w zachodnim Kalimantanie
Autorzy:
Zain, Zairin
Norita, Norita
Andi, Andi
Powiązania:
https://bibliotekanauki.pl/articles/24200992.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Konserwatorów Zabytków
Tematy:
Kadariah Palace
physical element,
Malay architecture
wooden structure
Pałac Kadariah
element fizyczny
architektura malajska
konstrukcja drewniana
Opis:
The use of wood materials as a characteristic of Malay architecture is related to local socio-cultural and environmental factors. The wood type used in traditional Malay structures has endured for hundreds of years, but in a state of decreased strength due to its being continuously exposed to biotic and abiotic harm factors. Documentation of the physical elements and identification of the current condition of the Kadariah Palace could preserve the value of the heritage building for future generations. The data was collected by field observation to be interpreted by applying a qualitative descriptive approach. The construction of the Kadariah Palace with structural, non-structural, and decorative ornaments is indicated by the physical elements of its appearance. The belian wood was used as a building material, which impacted the deterioration of the exteriors by biological and non-biological damage factors. The biological damage factor is caused by white rot, while non-biological damage factors are caused by weather, thermal, and mechanical factors.
Wykorzystanie materiałów drzewnych jako cechy charakterystycznej architektury malajskiej wiąże się z lokalnymi czynnikami społeczno-kulturowymi i środowiskowymi. Gatunek drewna stosowany w tradycyjnych strukturach malajskich zapewnia setki lat trwałości, ale ma zmniejszoną wytrzymałość przez ciągłe narażenie na biotyczne i abiotyczne czynniki. Dokumentacja elementów fizycznych i identyfikacja obecnego stanu pałacu Kadariah pozwalają zachować wartość zabytkowego budynku dla przyszłych pokoleń. Dane zebrane w trakcie badań terenowych zostały zinterpretowane przez zastosowanie jakościowego podejścia opisowego. Ornament konstrukcyjny, niekonstrukcyjny i dekoracyjny składają się na fizyczne elementy wyglądu pałacu. Drewno belian zostało użyte jako materiał budowlany, co wpłynęło na niszczenie elewacji przez czynniki biologiczne i niebiologiczne. Uszkodzenia biologiczne powodowane są białą zgnilizną drewna, natomiast czynniki niebiologiczne to wpływy pogodowe, termiczne i mechaniczne.
Źródło:
Wiadomości Konserwatorskie; 2022, 72; 89--100
0860-2395
2544-8870
Pojawia się w:
Wiadomości Konserwatorskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Structural Acoustic Analysis Using the FEM/FMBEM with Different Coupled Element Types
Autorzy:
Chen, L.
Zhao, W.
Liu, C.
Chen, H.
Powiązania:
https://bibliotekanauki.pl/articles/176330.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
boundary element method
finite element method
discontinuous boundary elements
acoustic fluid-structure interaction
fast multipole method
Opis:
A FEM-BEM coupling approach is used for acoustic fluid-structure interaction analysis. The FEM is used to model the structure and the BEM is used to model the exterior acoustic domain. The aim of this work is to improve the computational efficiency and accuracy of the conventional FEM-BEM coupling approach. The fast multipole method (FMM) is applied to accelerating the matrix-vector products in BEM. The Burton-Miller formulation is used to overcome the fictitious eigen-frequency problem when using a single Helmholtz boundary integral equation for exterior acoustic problems. The continuous higher order boundary elements and discontinuous higher order boundary elements for 2D problem are developed in this work to achieve higher accuracy in the coupling analysis. The performance for coupled element types is compared via a simple example with analytical solution, and the optimal element type is obtained. Numerical examples are presented to show the relative errors of different coupled element types.
Źródło:
Archives of Acoustics; 2017, 42, 1; 37-48
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decoupled Mems vibrating gyroscope simulations based on finite element method
Autorzy:
Nazdrowicz, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/398090.pdf
Data publikacji:
2018
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
gyroscope
comb structure
MEMS
Finite Element Method
giroskop
Metoda Elementów Skończonych
Opis:
In this paper the analysis of a MEMS vibrating gyroscope model is presented. The FEM analysis of the 3D structure has been performed in COMSOL Multiphysics software. Author took particular attention on mechanical properties particular parts of this device especially combs (used in electrostatical actuators and sensors) in drive and sense directions. For further electrostatic analysis (which is not covered in this article) this analysis has enormous meaning because any deformation of comb structure during operation influences on quality of electrostatic actuating and sensing. In this paper author performed stress results and deformation analysis in sense direction, however similar conclusions one can be drawn for drive direction.
Źródło:
International Journal of Microelectronics and Computer Science; 2018, 9, 2; 66-71
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A micromechanical approach to numerical modeling of yielding of open-cell porous structures under compressive loads
Autorzy:
Hedayati, R.
Sadighi, M.
Powiązania:
https://bibliotekanauki.pl/articles/949311.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
rhombic dodecahedron
additive manufacturing
micro-structure
porous biomaterials
implant
finite element
Opis:
Today, interconnected open-cell porous structures made of titanium and its alloys are replacing the prevalent solid metals used in bone substitute implants. The advent of additive manufacturing techniques has enabled manufacturing of open-cell structures with arbitrary micro-structural geometry. In this paper, rhombic dodecahedron structures manufactured using SLM technique and tested by Amin Yavari et al. (2014) are investigated numerically using ANSYS and LS-DYNA finite element codes for the modeling of the elastic and postyielding behavior of the lattice structure, respectively. Implementing a micro-mechanical approach to the numerical modeling of the yielding behavior of open-cell porous materials is the main contribution of this work.One of the advantages of micro-mechanical modeling of an open-cell structure is that, in contrast to the macro-mechanical finite element modeling, it is not necessary to obtain several material constants for different foam material models through heavy experimental tests. The results of the study showed that considering the irregularity in defining the cross-sections of the struts decreases both the yielding stress and densification strain of the numerical structure to the values obtained from the experimental tests. Moreover, the stress-strain curve of the irregular structure was much smoother in two points of yielding and densification, which is also observable in experimental plots. Considering the irregularity in the structure also decreased the elastic modulus of the lattice structure by about 20-30%. The post-densification modulus was more influenced by irregularity as it was decreased by more than 50%. In summary, it was demonstrated that using beam elements with variable cross-sections for constructing open-cell biomaterials could result in numerical results sufficiently close to the experimental data.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 769-781
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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