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Tytuł:
Thermoelastic strongly nonlinear vibration of rotating functionally graded ring plate
Autorzy:
Hu, Yu Da
Bao, Hai Jun
XU, Hao Ran
Powiązania:
https://bibliotekanauki.pl/articles/1839696.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
functionally graded ring plate
natural vibration
rotational motion
strong nonlinearity
improved L-P method
Opis:
For a metal ceramic functionally graded (FGM) ring plate, considering variations in physical properties with temperature and a power-law distribution of material components along the thickness direction, thermoelastic coupled nonlinear vibration equation in thermal environment is derived by means of Kirchhoff’s thin plate theory and the Hamiltonian principle. The transverse nonlinear vibration differential equation of the inner and outside-clamped ring plate under static load is obtained by using the Galerkin method; moreover, perturbation solution of static deflection is carried out. An improved L-P method is employed to solve the strongly nonlinear vibration equation. The vibration response and nonlinear natural frequency expression are developed. Through numerical examples, natural frequency characteristic curves of the rotating FGM ring plate are plotted. The Runge Kutta method is applied to obtain vibration response, phase and power spectrum diagrams. The influence of different parameters on natural vibration characteristics is analyzed. The results show that analytical solutions are consistent with numerical solutions, and the natural frequency decreases with an increase in the metal content and surface temperature, but grows with an increase in the rotational speed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 1; 157-171
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Dynamic Characteristics of Warp in the Process of Weaving
Badanie charakterystyk osnowy w procesie tkania
Autorzy:
Shen, D. F.
Ye, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/232138.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
loom
warp
nonlinear vibration
L-P method
Mathieu equation
krosna
osnowa
drgania nieliniowe
metoda L-P
równanie Mathieu
Opis:
The fluctuation process of warp movement is analysed by the nonlinear vibration method. Based on Newton’s Law, a differential equation of warp axial/cross direction movement is established. This paper separates the time variable from the space variable by the variable- separating method, then it gives a numerical solution of the motion equation by the fourth-order Runge-Kutta method. Also this paper discusses influencing factors and variable trends for warp vibration. Finally a method for the control of vibration is introduced.
Proces drgań przy ruchu osnowy jest analizowany przez nieliniową metodę określania drgań. Równanie różniczkowe poprzecznego i osiowego kierunku ruchu osnowy oceniane jest na podstawie prawa Newtona. W pracy tej zmienna czasowa i zmienna przestrzenna rozdzielone są metodą rozdziału zmiennych, co daje rozwiązanie numeryczne równania ruchu przy pomocy metody Runge-Kutty 4-tego rzędu. W artykule omówiono również wpływ czynników i tendencji zmien na drgania osnowy, jak również przedstawiono metodę kontroli drgań.
Źródło:
Fibres & Textiles in Eastern Europe; 2013, 2 (98); 68-73
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New properties of the Natarajan method of summability
Autorzy:
Natarajan, P. N.
Powiązania:
https://bibliotekanauki.pl/articles/745701.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
regular matrix
the (M, λ_n) method of summability
l-stronger
l-equivalent
ordered abelian semigroup
infinite chain
Opis:
The \((M, \lambda_n)\) method of summability was introduced in 2013 by Natarajan. In the paper some new properties of this method are studied.
Źródło:
Commentationes Mathematicae; 2015, 55, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability analysis of forest machines due to FMEA method
Autorzy:
Ťavoda, P.
Kováč, J.
Łukaszczyk, Z. Ł.
Powiązania:
https://bibliotekanauki.pl/articles/409738.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
reliability
FMEA method
forest machines
maintenance
Opis:
The article deals with the research of operational reliability of forest felling machines with the method FMEA (Failure Mode and Effect Analysis) and its implementation for observed machines in the organization. Forwarders 810D by John Deere were chosen for this research. The research was realized in real operational conditions. Application of the FMEA method allows flexibility in case of unexpected situations and optimization of human potential abilities. FMEA tool is a tool preventing outages operational reliability and preventive tool for ensuring the maintenance of facilities. This paper explores and verifies the operational reliability theory in practical real-world conditions, resulting in a reduction in operating (variable) costs, minimization of failures and readiness and increased performance of observed machines.
Źródło:
Management Systems in Production Engineering; 2018, 4 (26); 200-206
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of transient acoustic field using finite element method
Autorzy:
Koudela, L.
Jansa, J.
Karban, P.
Powiązania:
https://bibliotekanauki.pl/articles/377945.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
acoustic field
finite element method
acoustic wave
Opis:
Numerical solution of acoustic wave equation in the time domain is performed. The appropriate mathematical model is described by the partial differential wave equation supplemented with appropriate boundary conditions. The goal is to obtain the time evolution of the distribution of acoustic pressure, which can serve as the basis for the solution of various subsequent problems. The paper discusses the results of the numerical analysis of a semicircular acoustic diffuser in a free field, realized by a fully adaptive higher-order finite element method implemented in our own codes Agros2D and Hermes. The results are compared with the data obtained by the commercial code Comsol Multiphysics.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 73; 155-160
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie metody RAPD w określaniu mieszańcowego charakteru rodów Secale cereale L. x Dasypurum villosum (L.) P.Candargy
Application of RAPD method to evaluation of hybrid characters of Secale cereale L. x Dasypyrum villosum (L.) P. Candargy strains
Autorzy:
Gruszecka, D.
Miac, A.
Powiązania:
https://bibliotekanauki.pl/articles/799090.pdf
Data publikacji:
2002
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:
Materiał badawczy stanowiło 17 translokacyjnych rodów żyta, otrzymanych w wyniku krzyżowania Secale cereale L. odmiany Amilo (2n = RR = 14) z dzikim gatunkiem Dasypyrum villosum (L.) P. CANDARGY (2n = W = 14) (Krym, USSR). Rody te powstały w wyniku kilkakrotnego wstecznego zapylania roślin F₁ i F₂ rodzicielską odmianą żyta lub D. villosum, a następnie rozmnażania w izolacji. Celem pracy była próba weryfikacji charakteru mieszańcowego rodów kombinacji krzyżówkowej Secale cereale L. × Dasypyrum villosum (L.) P. CANDARGY oraz wybór oligonukleotydów, amplifikujących prążki charakterystyczne dla gatunku ojcowskiego i jednocześnie nieobecne u formy matecznej. Doświadczenie przeprowadzono przy zastosowaniu metody RAPD (Random Amplified Polymorphic DNA). Przeanalizowano 112 10-nukleotydowych starterów, każdy z nich testując na DNA form rodzicielskich oraz dwu mieszaninach, zawierających połączone DNA odpowiednio 9 i 8 rodów mieszańcowych. Każdy starter sprawdzano dwukrotnie, w celu potwierdzenia powtarzalności uzyskanych wzorów DNA. W wyniku przeprowadzonych analiz wybrano 16 oligonukleotydów spełniających powyższe kryterium. Poszczególne startery ujawniały od 9 do 16 prążków, z czego w większości przypadków charakterystyczny dla formy ojcowskiej był jeden, a w kilku przypadkach dwa. Obecność tych prążków sugeruje transfer DNA Dasypyrum villosum do żyta. Przeprowadzone doświadczenie jest wstępnym etapem do dalszych badań, w których wybrane startery RAPD zostaną zastosowane do amplifikacji DNA poszczególnych rodów. Podjęta zostanie próba selekcji mieszańców oraz ustalenia sprzężenia markerów RAPD z markerami morfologicznymi lub biochemicznymi. W dalszej kolejności wybrane materiały będą analizowane z zastosowaniem metody hybrydyzacji in situ.
Study material included 17 translocation rye strains achieved due to crossbreeding of Secale cereale L. of Amilo cv. (2n = RR = 14) with wild Dasypyrum villosum (L.) P. CANDARGY species (2n = VV = 14). These strains were created by back-pollination of F₁ and F₂ plants using parental rye variety or Dasypyrum villosum and then the reproduction in isolation. The aim of study was to verify the hybrid character of cross-combination of Secale cereale L. × Dasypyrum villosum (L.) P. Candargy strains as well as to choose the oligonucleotides amplifying bands characteristic for paternal species but at the same time absent in maternal form. The experiment was carried out using RAPD method (Random Amplified Polymorphic DNA). There were analyzed 112 10-nucleotide starters, testing each of them for parental DNA form and two mixtures containing combined DNA from 9 and 8 hybrid strains, respectively. Each starter was twice checked in order to confirm the repeatability of achieved DNA patterns. As a result of analyses performed, 16 oligonucleotides meeting the above criterion were chosen. Particular starters disclosed from 9 to 16 bands including in most cases one, and in several others two characteristic bruds for paternal form. The presence of these bands suggests the DNA transfer from Dasypyrum villosum L. Candargy to rye. The experiment makes a preliminary stage to further studies in which selected RAPD starters would be applied for amplification of DNA in particular strains. An attempt will be undertaken to select hybrids and evaluate the conjunction of RAPD markers with morphological or biochemical markers. Next, chosen materials will be analyzed using in situ hybridization method.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2002, 488, 1
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microhardness as a method for investigation of fossil resins
Autorzy:
Czapla, D.
Natkaniec-Nowak, L.
Drzewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/184495.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
polymerize
chemical structure
process
Opis:
Natural fossil resins are products of deciduous and coniferous trees formed at least 40 million years ago. The fact that fossil resins survived until the present day is due to appropriate processes and conditions. One of them is the ability to polymerize. There are types of chemical structures derived from the original plant secretions which formed polymerized or macromolecular connection resistant to various environmental factors (Penney 2010). The polymerization process gives property of better susceptibility to mechanical machining, and thus jeweler’s usefulness (Matuszewska 2015). Fossil resins are being found along the southern coast of the Baltic Sea (from Jutland Peninsula to the Sambia) and ranges stretching trough Germany, Poland, Lithuania, Latvia, Belarus and Ukraine (Czechowski et al. 1996, Heflik & Natkaniec-Nowak 2011). They are also occurring in other locations, for example in Mexico, Domini - can Republic, Colombia and SE Asia (e.g. Myanmar, Indonesia). The most commonly used diagnostic methods for fossil resins are spectroscopic methods (FT-IR, RS) (Kosmowska-Ceranowicz 1999a). They allow identification of different varieties of resins and get to know their internal structure (Czechowski et al. 1996, Kosmowska-Ceranowicz 1999b, Matuszewska 2010, 2015). Quantification possibilities have also other methods, such as X-ray fluorescence, diffractometry, and most of allchemical methods. In recent years, t method for determining the absolute hardness (microhardness) (Matuszewska & Gołąb 2008) was added to these analytical techniques. This parameter clearly shows the relationship between physico-chemical features with different aspects of their genesis. It can be helpful in determining the age of resins (Matuszewska et al. 2002). Hardness as the primary diagnostic feature of many minerals is evaluated relatively to model of 10 minerals in Mohs scale. Reported in the literature (Savkievich 1967, Popkova 1984, Matuszewska 2009), hardnesses of fossil resins are from 1 to 3, which correspond to hardness of talc (1), gypsum (2) and calcite (3). It therefore varies; for succinite (which is treated as a model for fossil resins) range is from 1.5 to 3, while Colombian copal from 1 to 1.5. It depends mainly on the degree of macromolecular structure condensation of these materials. The subjects of the study were samples of fossil resins selected from Mexico (Chiapas), Dominican Republic (Barahona) and Colombia (Velez). In addition, for comparison purposes Baltic succinite were measured. The measurements were done in Gemological Laboratory at WGGiOŚ AGH using a microhardness tester PMT-3 from Russian manufacturer. For the determination of this parameter Vickers method was used, according to which the microhardness determines the ratio of the pressure force of diamond pyramid with load to the lateral surface of the depth print. For measurement, 250 mg load. The test was conducted on the smooth surface of each of 6 samples repeating the measurement 20 times. The obtained results allow concluding clearly that the individual fossil resin samples are significantly different from each other. These differences result from different places of origin and age, thus the conditions of the geological, natural environment, climate, etc. Average value of the microhardness for fossil resins from Mexico and Colombia is the lowest – respectively 18.54 kG/mm 2 and 19.87 kG/mm 2 . In turn, the value of this parameter for the samples from Dominican Republic is significantly higher (yellow resin – 26.59 kG/mm 2 ; orange resin – 27.76 kG/mm 2 ; dark red resin – 26.57 kG/mm 2 ). Succinite achieves the highest values of microhardness in comparison with other resins. This is due to the difference in their ages – Eocene Baltic amber, is the oldest studied resin, therefore condensation processes in the structure are more advanced. Slightly lower values achieve Miocene – Oligocene resins from Dominican Republic. Lower Miocene – upper Oligocene and Pleistocene – Pliocene samples from Mexico and Colombia, have the lowest microhardness. The differences in microhardness of various resins may be explained by the fact that their fossilization underwent in different environmental conditions. The environmental conditions were different in various geographical locations. The degree of condensation and polymerization of the resins and their hardness increased with time. Therefore, in case of the oldest investigated resin, succinite-Baltic amber, the measured microhardeness was the highest.
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 63-64
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enzymatic reductive amination of p-hydroxy- and phenylpyruvic acids as a method of synthesis of L-tyrosine and L-phenylalanine labelled with deuterium and tritium
Autorzy:
Pałka, K.
Kańska, M.
Powiązania:
https://bibliotekanauki.pl/articles/146609.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
deuterium
enzyme
L-phenylalanine
tritium
L-tyrosine
Opis:
We report the synthesis of isotopomers of L-phenylalanine and L-tyrosine selectively labelled with hydrogen isotopes in the 2-position of the side chain. The deuterium or tritium label was introduced using reductive amination activity of enzyme L-phenylalanine dehydrogenase (EC 1.4.1.20). This way p-phenylpyruvic acid was converted into [2-2H]-, [2-3H]-, and doubly labelled [2-2H/3H]-isotopomers of L-phenylalanine, using deuteriated, tritiated, and mixed (DTO) incubation media, respectively. Similarly, p-hydroxyphenylpyruvic acid was converted into [2-2H]-, [2-3H]-, and [2-2H/3H]-L-tyrosine. Deuterium labelled isotopomers of L-phenylalanine and --tyrosine can be used as markers in the investigation of abnormal metabolism of these amino acids observed in patients with inborn genetic diseases such as phenylketonuria and tyrosinemia.
Źródło:
Nukleonika; 2012, 57, 3; 383-387
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nieprawidłowa synchronizacja turbogeneratora
Abnormal turbogenerator synchronization
Autorzy:
Gozdowiak, A.
Kisielewski, P.
Antal, L.
Powiązania:
https://bibliotekanauki.pl/articles/302276.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Druk-Art
Tematy:
turbogenerator
błędna synchronizacja
metoda elementów skończonych
faulty synchronization
finite element method
Opis:
Prezentowany artykuł zawiera wyniki obliczeń przebiegu błędnej synchronizacji turbogeneratora podczas załączenia na sieć przy różnych kątach fazowych napięć zmienianych w pełnym zakresie kątowym (–180 deg, 180 deg). Przedstawiono wpływ błędnej synchronizacji na pracę systemu elektroenergetycznego. Zbadano zjawiska zachodzące w trudno dostępnych pomiarowo miejscach wirnika. Określono najbardziej narażone węzły konstrukcyjne turbogeneratora w rozpatrywanym anormalnym stanie pracy. W obliczeniach wykorzystano polowo-obwodowy model turbogeneratora.
Presented article contains the computation results of turbogenerator faulty synchronization during tripping on the grid for different voltage phase shift changed in full range (–180 deg, 180 deg). It is shown the impact faulty synchronization on the power system. The great emphasis is placed on the physical phenomena existing in the rotor because the measurement of rotor damper bar currents is difficult in practice. The most likely construction elements are estimated in this abnormal operation state. The field-circuit model of the turbogenerator is used during the computations.
Źródło:
Napędy i Sterowanie; 2017, 19, 2; 62-66
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nieprawidłowa synchronizacja turbogeneratora
Abnormal turbogenerator synchronization
Autorzy:
Gozdowiak, A.
Kisielewski, P.
Antal, L.
Powiązania:
https://bibliotekanauki.pl/articles/1201785.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
turbogenerator
błędna synchronizacja
metoda elementów skończonych
faulty synchronization
finite element method
Opis:
Presented article contains the computation results of turbogenerator faulty synchronization during tripping on the grid for different voltage phase shift changed in full range (-180 deg, 180 deg). It is shown the impact faulty synchronization on the power system. The great emphasis was placed on the physical phenomena existing in the rotor because the measurement of rotor damper bar currents is difficult in practice. The most likely construction elements were estimated in this abnormal operation state. The field-circuit model of the turbogenerator was used during the computations.
Prezentowany artykuł zawiera wyniki obliczeń przebiegu błędnej synchronizacji turbogeneratora podczas załączenia na sieć przy różnych kątach fazowych napięć zmienianych w pełnym zakresie kątowym (-180 deg, 180 deg). Przedstawiono wpływ błędnej synchronizacji na pracę systemu elektroenergetycznego. Zbadano zjawiska zachodzące w trudno dostępnych pomiarowo miejscach wirnika. Określono najbardziej narażone węzły konstrukcyjne turbogeneratora w rozpatrywanym anormalnym stanie pracy. W obliczeniach wykorzystano polowo-obwodowy model turbogeneratora.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2016, 1, 109; 19-24
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of the Cavity Damping on Vehicular Evaluation using the Finite Element Method
Autorzy:
Ferreira, T. S.
Magalhães, P. A.
Moura, F. L.
Powiązania:
https://bibliotekanauki.pl/articles/176986.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
finite element method
acoustic control
trimmed body
numerical experimental correlation
modal damping
Opis:
This work focuses on finding a numerical solution for vehicle acoustic studies and improving the usefulness of the numerical experimental parameters for the development stage of a new automotive project. Specifically, this research addresses the importance of modal cavity damping for vehicle exerts during numerical studies. It then seeks to suggest standardized parameter values of modal cavity damping in vehicular acoustic studies. The standardized value of modal cavity damping is of great importance for the study of vehicular acoustics in the automotive industry because it would allow the industry to begin studies of the acoustic performance of a new vehicle early in the conception phase with a reliable estimation that would be close to the final value measured in the design phase. It is common for the automotive industry to achieve good levels of numerical-experimental correlation in acoustic studies after the prototyping phase because this phase can be studied with feedback from the simulation and experimental modal parameters. Thus, this research suggests values for modal cavity damping, which are divided into two parts due to their behaviour: ξ(x) = −0.0126(x − 100) + 6.15 as a variable function to analyse up to 100 Hz and 6.15% of modal cavity damping constant for studies between 30 Hz and 100 Hz. The sequence of this study shows how we arrived at these values.
Źródło:
Archives of Acoustics; 2016, 41, 1; 87-97
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new optimization algorithn based on a paradigm inspired by nature
Autorzy:
Astudillo, L.
Melin, P.
Castillo, O.
Powiązania:
https://bibliotekanauki.pl/articles/384881.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
natural computing
novel optimization method
chemical reactions paradigm
Opis:
In this paper, we propose a new optimization algorithm for soft computing problems, which is inspired on a nature paradigm: the reaction methods existing on chemistry, and the way the elements combine with each other to form compounds, in other words, quantum chemistry. This paper is the first approach for the proposed method, and it presents the background, main ideas, desired goals and preliminary results in optimization.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2011, 5, 1; 95-100
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A graphical method for Great Circle Routes
Autorzy:
Hsu, T. P.
Chen, C. L.
Hsieh, T. H.
Powiązania:
https://bibliotekanauki.pl/articles/259336.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
transoceanic shipping
great circle route
waypoints
celestial meridian diagram
Opis:
A great circle route (GCR) is the shortest route on a spherical earth model. Do we have a visual diagram to handle the shortest route? In this paper, a graphical method (GM) is proposed to solve the GCR problems based on the celestial meridian diagram (CMD) in celestial navigation. Unlike developed algebraic methods, the GM is a geometric method. Appling computer software to graph, the GM does not use any equations but is as accurate as using algebraic methods. In addition, the GM, which emphasizes the rotational surface, can depict a GCR and judge its benefit.
Źródło:
Polish Maritime Research; 2017, 1; 12-21
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static finite element analysis of lower limb
Autorzy:
Zach, L.
Konvickova, S.
Ruzicka, P.
Powiązania:
https://bibliotekanauki.pl/articles/285008.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
metoda elementów skończonych
kończyna dolna
endoprotezy
finite element method
lower limb
endoprostheses
Opis:
The paper deals with a simulation by means of finite method of a natural lower limb after a knee joint arthroplasty in a full extension. Our last static model serving as a starting point for our future dynamic analysis is presented now. Aside a total knee endoprosthesis Medin Modular provided by MedinOrthopedics, a.s., two long bones, femur and tibia were used. Compared with our former results, this model gives reduced stress and contact pressures values which were given by more realistic ankle and hip joint definition. Their distributions also correspond better the experimental findings.
Źródło:
Engineering of Biomaterials; 2007, 10, no. 63-64; 6-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FEM and experimental based analysis of the stamping process of aluminum alloy
Autorzy:
Różyło, P.
Wójcik, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/102747.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pressing
experimental study
numerical analysis
finite element method
Opis:
The subject of the study was aluminum samples of varying thickness. The aim of the study was to perform the experimental stamping process of the samples on a universal testing machine and a numerical analysis on two independent computer systems Abaqus® and Deform-3D. As part of the numerical analysis, bilinear material model was included, taking into account elastic and plastic characteristics. The study was conducted in a dynamic environment with geometric nonlinearity. The results obtained from experimental research were confronted with those obtained by FEM computer simulation. During the research, numerical model of the stamping process has been developed, which was validated with the results of experimental research.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 94-101
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heavy metal content in environmental enrichment used for laboratory rodents
Zawartość metali ciężkich we wzbogaceniach środowiskowych dla myszy i szczurów laboratoryjnych
Autorzy:
Ochniewicz, P.
Karczmarczyk, U.
Sochaczewski, L.
Laszuk, E.
Garnuszek, P.
Powiązania:
https://bibliotekanauki.pl/articles/13925551.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
heavy metal content
environmental enrichment
laboratory animal
ICP-AES method
analytical method
feeding standard
rodent
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2019, 597; 23-29
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High Pressure-High Temperature Method on the Selected Mechanical Properties of Steel AISI 316L with 2% TiB2
Autorzy:
Kurtyka, P.
Sulima, I.
Hyjek, P.
Jaworska, L.
Powiązania:
https://bibliotekanauki.pl/articles/356857.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high pressure-high temperature
physical properties
mechanical properties
steel matrix composites
titanium diboride
Opis:
AISI 316L/TiB2/2p composites were manufactured by HP-HT using different pressures (5 and 7 GPa) and temperatures (900-1300°C), with constant reinforcing particle content 2 vol%. The mechanical properties of the composites were evaluated on the basis of hardness (HV0.3) and compression tests (20°C, 10-5 s-1). The results showed that the role of sintering pressure increased with increasing process temperature. At temperatures of 900°C and pressures of 5 and 7 GPa the difference in measured values of compressive strength was 1-2%, while at 1300°C they reached 20%. At constant pressure of 5 GPa, a change in hardness and compressive strength of 40% were obtained with a temperature change of 900 to 1300°C. Changes in mechanical properties in the composite occurred without substantial changes in density, microstructure, reinforcement phase distribution, and phase composition in the matrix.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1585-1592
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulations of front impact between two shunting locomotives at different velocities
Autorzy:
Szurgott, P.
Kozioł, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/244509.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
finite element method
dynamic analysis
crash test
railway vehicle
LS-DYNA
Opis:
The main aim of this study is to carry out dynamic simulations of a crash between two identical shunting locomotives running at different velocities. Numerical analyses using a Finite Element Method (FEM) include front-end impact of the running locomotive with a stationary one situated on the track. Such collision scenario is required for railway vehicles operated on national and regional networks. A considered locomotive based on a Polish shunting locomotive – SM42, however the tested locomotive was slightly modernized. Finite element model of the locomotive was developed by the authors. FE analyses were conducted according to the PN-EN 15227 standard, which provides crashworthiness requirements for railway vehicle bodies. LS-DYNA computer code was used for the simulations. The paper presents selected results of analyses focused on the locomotive frame behaviour. Simulations were performed for the vehicle between 20 and 90 km/h. An influence of the impact velocity on some output quantities was determined. Contours of effective stress for selected moments of time as well as time histories of selected values are depicted. For modernized locomotives, it is required to evaluate their behaviour during the impact test. Dynamic numerical simulation is acceptable since the experimental tests on the complete objects under consideration are impractical and impossible sometimes.
Źródło:
Journal of KONES; 2016, 23, 2; 381-388
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Agglomeration of Al2O3 Particles in Liquid Steel
Autorzy:
Kalisz, D.
Żak, P. L.
Kuglin, K.
Powiązania:
https://bibliotekanauki.pl/articles/352045.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steel
agglomeration
non-metallic inclusion
PSG Method
Opis:
The removal of non-metallic inclusions from liquid steel is a result of co-operation of fluctuation, adhesion and agglomeration effects, with emphasis on agglomeration which plays the most important role. It is based on a few types of collisions between non-metallic particles, where turbulent collisions are most prominent. As a result of agglomeration, nonmetallic inclusions are intensely removed through flotation and increase of different dimensions of inclusions, which manifests itself with the occurrence of clusters mainly composed of Al2O3 precipitations. Authors investigated the agglomeration effect by making computer simulations with the use of the PSG method. The calculations were performed for a definite population of spherical particles of radius r in the steel volume. The applied calculation method allows for analyzing the dynamics of the collision process. The assumed initial number of particles remains constant, only the number of particles in specific size-groups varies. It was also revealed that the process of agglomerates formation is much faster for particles having a bigger initial radius. In the case of very small precipitations (r=1 μm) their removal through agglomeration is very difficult because the probability those collisions can take place between them rapidly decreases.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2091-2096
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of Gauss monocycle pulse in transient acoustic field
Autorzy:
Koudela, L.
Jansa, J.
Karban, P.
Powiązania:
https://bibliotekanauki.pl/articles/97307.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Gauss monocycle pulse
acoustic transient field
finite element method
Opis:
Numerical solution of acoustic wave equation in the time domain is performed. The mathematical model is described by the partial differential wave equation supplemented with appropriate boundary conditions. The goal is to obtain the time evolution of the distribution of acoustic pressure, which can serve as the basis for the solution of various subsequent problems. The paper discusses the results of the numerical analysis of the Gauss monocycle pulse that proceeds from the signal source and incident on the semi-circular acoustic diffuser in a free field, realized by a fully adaptive higherorder finite element method implemented in codes Agros2D and Hermes developed by the hp-FEM group. Selected results of the computations are compared with the data obtained by the commercial code COMSOL Multiphysics.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 141-147
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coastline change-detection method using remote sensing satellite observation data
Autorzy:
Markiewicz, Ł.
Mazurek, P.
Chybicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/331592.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
coastal monitoring
SAR
Sentinel
Landsat
background subtraction
image processing
Opis:
Coastal zones are not only the fundaments for local economics based on trade, shipping and transport services, but also a source of food, energy, and resources. Apart from offering diverse opportunities for recreation and tourism, coastal zones provide protection against storms and other meteorological disturbances. Environmental information is also essential because of the direct influence on a country’s maritime zones, which are territorial sea and exclusive economic zones. Keeping local communities and ecosystems healthy requires monitoring and assessing of all the vital changes of territorial sea and its baseline. The paper presents a method and a concept of a system that provides an efficient means of automatic analysis of spatial data provided by satellite observation systems (optical Landsat 8 and SAR Sentinel 1) in order to monitor, and detect, changes in the coastline. The proposed methodology is based on a set of algorithms that enable one to trace and detect changes in coastline shape, and eventual damage to marine infrastructure, such as breakwaters and harbours, relying on high resolution satellite observational products.
Źródło:
Hydroacoustics; 2016, 19; 277-284
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of Si3N4 – graphene composites sintered by SPS method
Autorzy:
Klimczyk, P.
Jaworska, L.
Cygan, S.
Morgiel, J.
Major, Ł.
Olszyna, A.
Powiązania:
https://bibliotekanauki.pl/articles/391862.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
silicon nitride
graphene
Young's modulus
hardness
friction coefficient
wear rate
Opis:
Silicon nitride powder with a small addition of magnesium oxide and yttria stabilized tetragonal zirconia fine particles was used as a starting material. Multilayer graphene nanoplatelets were used as filler for silicon nitride based composites. Graphene content in the mixtures was 0‒2 wt. %. The composites were obtained by the Spark Plasma Sintering method at 1650°C under 35 MPa of uniaxial pressure. Separation of the agglomerated graphene platelets in the matrix was observed for these materials. Insufficient dispersity of graphene slightly decreased the mechanical properties of Si3N4 ceramics. The SEM and TEM microstructural analysis of sintered materials show that the applied pressure during the sintering process leads to the orientation of the graphene phase and in consequence causes anisotropy of properties. The differences of friction coefficients were examined with the Ball-on-Disc method for the two directions (parallel and perpendicular to the pressing axis). Also the specific wear rate of the ball for the direction parallel to pressing axis differ significantly in comparison to the wear for the direction perpendicular to the pressing direction.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 235-239
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda i urządzenia do oceny stanu nawierzchni lotniska trawiastego
A method for testing the grassy airfield surface
Autorzy:
Pytka, J.
Tarkowski, P.
Kaznowski, Ł.
Piaskowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/155808.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
metody badawcze
lotniska trawiaste
czujnik tensometryczny
test method
grassy airfields
strain gauge transducer
Opis:
W pracy przedstawiono podstawy teoretyczne metody oceny gruntowych i trawiastych nawierzchni lotniskowych a także opisano narzędzia, metody, urządzenia badawczo-pomiarowe. Należą do nich: wózek dynamometryczny, ręczny tester nawierzchni oraz LIDAR (skaner optoelektroniczny 3D). Zamieszczono przykładowe wyniki pomiarów.
The paper is devoted to a new method for assessment of the grassy airfield surface. The existing methods are based on soil related parameters such as CI (Cone Index) or CBR (California Bearing Ratio). One disadvantage of those methods is that the prediction of ground performance of an aircraft on a soft surface requires recalculation and conversion when calculating the takeoff or the landing of ground roll distances. Therefore, the authors’ idea was to introduce a method based on direct coefficients, related to the wheel performance. The knowledge of the actual values of rolling resistance and braking friction facilitates predicting the airplane ground performance in order to perform safe operations. We developed two original measuring devices, a single wheel tester and a portable surface tester. The devices are presented in this paper together with schematics and illustrations. The wheel tester was designed with the use of an airplane landing gear wheel, into which a five-element, wheel dynamometer was embedded. The measuring wheel was mounted on a trailer and the complete wheel tester was carried on a base vehicle (SUV). The second device is a portable tester, operated by a single technician. The portable tester was built with the use of a scale wheel (a model airplane landing gear wheel), which was supported on two load cells. The load cells measure surface reaction forces acting on a wheel during low speed rolling and braking. Another important parameter of a grassy surface is its roughness. It is almost impossible to maintain the grassy surface so that it is perfectly smooth. A typical grass field is a living ecosystem, which transforms its external shape and builds a rough surface. This must be monitored and for this purpose we used a commercially available LIDAR device. The LIDAR operates on a principle of light odometer and it allows 1mm resolution in short distance measurements. The paper includes the primarily results obtained in field experiments with the use of the presented devices. It can be concluded that the presented method may set fundamentals of a new system for assessment of grassy airfields. Further studies and research should focus on validation of the method and preparation for certification.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 8, 8; 637-640
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of concrete voids in an untypical railway bridge pillar by Ground Penetrating Radar Method
Autorzy:
Owerko, P.
Ortyl, Ł.
Salamak, M.
Powiązania:
https://bibliotekanauki.pl/articles/114703.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
NDT
GPR
bridges
reinforced concrete
void identification
Opis:
The article presents the results of non-destructive testing, which was carried out on the concrete pillar with an unusual, trapezoidal shape and densely spaced reinforcement. After stripping the formwork, some surface voids became visible, which suggested that the existence of subsurface voids was also probable. The Ground Penetrating Radar method (GPR) was used to state whether these voids are formed and possibly to determine their approximate location. This paper discusses the adopted methodology of measurements, analysis and the GPR data processing. The interpretation of the echograms was based on a comparison of recorded GPR data with the modelling results MRS (FD) of electromagnetic wave propagation with the known geometry of the tested pillar. The results of detection are shown mainly in the form of the echograms (B-SCAN) and are collected as a cumulative sketch (C-SCAN). In order to assess the impact of the identified voids on the bearing capacity of the structure, the shell model of the pillar was built with the use of FEM. It shows stress distribution differences in the pillar with a continuous internal structure and in the pillar with the modelled voids. The obtained results were used for checking the bearing capacity of damaged pillar and during the preparation of the effective repair program.
Źródło:
Measurement Automation Monitoring; 2015, 61, 3; 76-80
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
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