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Wyświetlanie 1-15 z 69
Tytuł:
Advanced Magnetic Materials for Aeronautics
Autorzy:
Šmelko, M.
Praslička, D.
Blažek, J.
Powiązania:
https://bibliotekanauki.pl/articles/97789.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
microwires
strain gauge
mechanical stress
contactless
Opis:
In the field of magnetic sensors, magnetic microwires with positive magnetostriction are the materials of the future. Their mechanical and magnetic properties render them ideal materials for applications in aeronautics. A single microwire with a 40 μm diameter and a length of 10 mm is capable of capturing information about tensile stresses, magnetic fields, temperature and distance. This information is carried by a parameter called the Switching Field, HSW, which is specific for different types of microwire. Numerous physical qualities affect the HSW and through sensing of HSW, these qualities may be quantified. (A number of physical qualities affecting HSW can be sensed and quantified by means of a contactless induction method.) What distinguishes the system developed by the present authors from other measuring systems based on magnetic microwires is the positioning of a microwire outside the coil system. Thanks to this improvement it is possible to use microwires embedded directly in the construction material. Small dimensions microwires do not damage the structure of the construction material. The absence of a galvanic connection makes this technology even more interesting compared with traditional forge gauges. Offering the possibility of the simultaneous measuring of four parameters, this technology can be used in a wide range of aviation applications. Measurements of an external magnetic field can be used for the navigation and stabilization of an aerial vehicle. Tensile stress and distance measuring can be helpful to understand some processes occurring under the surface of the construction material and also to perform fatigue monitoring or structure load monitoring. Another big advantage of magnetic microwires is the low price. Just 1 gram of base material is sufficient to prepare about 40 km of microwire. All these features combine to offer us a material ideal for Smart Sensors, possibly available for use in the near future.
Źródło:
Fatigue of Aircraft Structures; 2013, 5; 60-65
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of mechanical stress in in-wheel motor
Autorzy:
Xu, Jie
Powiązania:
https://bibliotekanauki.pl/articles/2086692.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deformation
in-wheel motor
mechanical loads
mechanical stress
Opis:
When the in-wheel motor is working, it will be affected by gravity, centrifugal force and electromagnetic force. These three kinds of mechanical loads will affect the mechanical stress characteristics of the in-wheel motor, and then affect the reliability of the in-wheel motor structure. In order to understand the influence of the above loads on the mechanical stress of the in-wheel motor, this paper takes a 15-kW built-in permanent magnet in-wheel motor as the research object. Based on the establishment of the electromagnetic field and structure field coupling analysis model of the in-wheel motor, the mechanical stress of the in-wheel motor under different mechanical loads under rated and peak conditions are calculated and analyzed, and the influence of different mechanical loads on the stress and deformation of the in-wheel motor are studied. The research results show that, regardless of the rated operating condition or the peak operating condition, the in-wheel motor has the largest mechanical stress and deformation under the combined action of centrifugal force and electromagnetic force, and the smallest mechanical stress and deformation under the action of gravity only; under the same load (except for the case of gravity only), the stress and deformation of the in-wheel motor under the peak operating condition are larger than those under the rated operating condition; and the maximum stress and deformation of the in-wheel motor appear at the rotor magnetic bridge and the inner edge of the rotor, respectively, so the rotor is an easily damaged part of the in-wheel motor.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 455--469
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical-stress analytical modeling for the design of coils in power applications
Autorzy:
Bellan, D.
Powiązania:
https://bibliotekanauki.pl/articles/140401.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coils
mechanical stress
analytical modeling
line traps
PLC
Opis:
Modern electrical-power systems are often exploited for transmitting highfrequency carrier signals for communications purposes. Series-connected air-core coils represent the fundamental component allowing such applications by providing a proper filtering in the frequency domain. They must be designed, however, to withstand also the line short-circuit current. When a high-magnitude current flows through a coil, strong mechanical stresses are produced within the conductor, leading to possible damage of the coil. In this paper, an approximate analytical model is derived for the relationship between the maximum mechanical stress and the electrical/geometrical parameters of the coil. Such a model provides the guidelines for a fast and safe coil design, whereas numerical simulations are only needed for the design refinement. The presented approach can be extended to other applications such as, for example, the mechanical stress resulting from the inrush currents in the coils of power transformers.
Źródło:
Archives of Electrical Engineering; 2014, 63, 4; 579-590
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of influence of mechanical stresses arising in magnetic circuit on magnetizing characteristic
Autorzy:
Idziak, Paweł
Kowalski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/140929.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modelling
coupled phenomena
magnetized characteristics
mechanical stress (MS)
Opis:
An algorithm of determination of mechanical stresses and deformations of the magnetic circuit shape, caused by forces of magnetic origin, is presented in this paper. The mechanical stresses cause changes of magnetizing characteristics of the magnetic circuit. The mutual coupling of magnetic and mechanical fields was taken into account in the algorithm worked out. A computational experiment showed that it was possible to include the interaction of both fields into one numerical model. The elaborated algorithm, taking into account the impact of mechanical stresses on magnetic parameters of construction materials, can be used in both the 2D and the 3D type field-model.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 209-220
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability of the local phi MS values over the gate area of MOS devices
Autorzy:
Przewłocki, H. M.
Kudła, A.
Brzezińska, D.
Massoud, H. Z.
Powiązania:
https://bibliotekanauki.pl/articles/308803.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
MOS structure
photoelectric measurements
electrical parameters
mechanical stress
Opis:
The local value distributions of the effective contact potential difference (ECPD or the phi MS factor) over the gate area of Al-SiO2-Si structures were investigated for the first time. A modification of the photoelectric phi MS measurement method was developed, which allows determination of local values of this parameter in different parts of metaloxide-semiconductor (MOS) structures. It was found that the phi MS distribution was such, that its values were highest far away from the gate edge regions (e.g., in the middle of a square gate), lower in the vicinity of gate edges and still lower in the vicinity of gate corners. These results were confirmed by several independent photoelectric and electrical measurement methods. A model is proposed of this distribution in which the experimentally determined phi MS (x; y) distributions, found previously, are attributed to mechanical stress distributions in MOS structures. Model equations are derived and used to calculate phi MS (x; y) distributions for various structures. Results of these calculations remain in agreement with experimentally obtained distributions. Comparison of various characteristics calculated using the model with the results of photoelectric and electrical measurements of a wide range of Al-SiO2-Si structures support the validity of the model.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 1; 34-44
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing internal mechanical stresses in flash-butt welded rail joints
Autorzy:
Mikłaszewicz, Ireneusz
Siwiec, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/215467.pdf
Data publikacji:
2019
Wydawca:
Instytut Kolejnictwa
Tematy:
mechanical stress
rail joints
strain gauges
fatigue test
Opis:
The paper presents the results of internal stress tests in rails and flash-butt welded rail joints. Stress patterns were tested in rail joints just after flash-butt welding, as well as after fatigue tests. Stress tests were performed using the destructive strain gauges based test method. Stresses emerging in rails and in rail joints were compared for the steel grades R260 and R350HT. Stress measurements were performed in accordance with the requirements of PN EN 13674 1:2011+A1:2017.
Źródło:
Problemy Kolejnictwa; 2019, 185; 111-117
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Mechanical Stress Analysis of Ladle Lining with Integral Brick Joint
Autorzy:
Chang, W.
Li, G.
Kong, J.
Sun, Y.
Jiang, G.
Liu, H.
Powiązania:
https://bibliotekanauki.pl/articles/354915.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ladle
heat transfer model
lining
expansion joint
thermal mechanical stress
Opis:
Based on the theory of heat transfer, the influence of expansion joints on the temperature and stress distribution of ladle lining is discussed. In view of the current expansion joint, the mathematical model of heat transfer and the three dimensional finite element model of ladle lining brick are established. By analyzing the temperature and stress distribution of ladle lining brick when the expansion joints are in different sizes, the thermal mechanical stress caused by the severe temperature difference can be reduced by the suitable expansion joint of the lining brick during the ladle baking and working process. The analysis results showed that the thermal mechanical stress which is caused by thermal expansion can be released through the 2 mm expansion joint, which is set in the building process. So we can effectively reduce the thermal mechanical stress of the ladle lining, and there is no risk of steel leakage, thus the service life of ladle can be effectively prolonged.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 659-666
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda wektorowa do rozwiązywania mechaniki linii napowietrznych
Vector method solving of mechanics of overhead lines
Autorzy:
Dypa, Justyna
Beňa, Ľubomír
Powiązania:
https://bibliotekanauki.pl/articles/37516578.pdf
Data publikacji:
2022
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
krzywa łańcuchowa
naprężenie mechaniczne
przewód
catenary curve
mechanical stress
conductor
Opis:
Przewody odgrywają znaczącą rolę w systemie elektroenergetycznym, należy więc zadbać, aby nie ulegały awarii, charakteryzowały się trwałością i należycie pełniły swoją funkcję. Badanie wytrzymałości linii napowietrznych opiera się na obliczeniach mechanicznych. Dotychczas stosowano dwa rozwiązania analizujące parametry mechaniczne oraz położenie przewodu. Niestety powszechne metody charakteryzują cięgno jedynie w jednej płaszczyźnie. Dlatego niniejsza praca przedstawia inne rozwiązanie, w postaci metody wektorowej. Wspomniane podejście opiera się na określeniu odpowiednich wielkości wektorowych charakteryzujących przewód w postaci sił naciągu, obciążeń, położenia przęsła. Metoda wektorowa pozwala na określenie dokładnego położenia przewodu w przestrzeni podczas oddziaływania obciążeń w postaci oblodzenia o dowolnej grubości i charakterze oraz wiatru z dowolną prędkością i różnych kierunkach.
Presented method solving of mechanic of overhead lines is the most universal method. Thanks to this method can be presented position of conductor in three-dimensional space in nonlevel span. Might be investigate the effect of combined overloading caused by ice and wind of optional direction. Using vector method have been presented formulas for equation of state, position of conductor and tension force. In the article were presented results of the utilisation of vector method to calculate mechanical parameters like mechanical stress, overloading and position of conductor in the coordinate system x, y, z. Vector method should be used to solution of overhead line conductor, because actual methods is not sufficient for all cases, for example for sloping spans or large length of spans.
Źródło:
Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika; 2022, 39; 5-19
0209-2662
2300-6358
Pojawia się w:
Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of temperature and strain rate on the strengthening of metallic materials
Autorzy:
Kyzioł, L.
Powiązania:
https://bibliotekanauki.pl/articles/244257.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
strengthening materials
dislocations
athermic stress
mechanical threshold stress (MTS)
Opis:
Extensive literature indicates that the effect of strengthening materials is related to their structural construction. The structure of the metallic material exhibits the greatest strengthening effect when there is a very limited movement of dislocations and their movement is completely blocked due to numerous obstacles [1, 3, 6-9, 12, 15, 16]. In this paper strain, rate and temperature dependences of yield strength of metallic materials are presented. The effect of temperature and strain rate on the value mechanical threshold stress is determined. In addition, the effect of temperature on the Kirchhoff modulus and Burgers vector is determined. The interaction of dislocations with grain boundaries causes additional stress – athermal stress causing the strengthening of the structure. The term “athermal” implies that thermal activation is unable to assist the dislocation past these obstacles. The strengthening of metallic materials is related to the dimensions of the grains, which influence the athermic stress. The calculations of mechanical threshold stress and other parameters of the structure of the material allow for easier understanding of the strengthening of the material loaded with temperature and strain rate. The largest strengthening occurs in pure metals and their alloys in the case of the total blocking of dislocation motion. This process takes place when the temperature is 0 K or at very high strain rates. The metal demonstrates the greatest effort, which is called mechanical threshold stress (MTS) [5].
Źródło:
Journal of KONES; 2016, 23, 1; 199-206
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Externally Applied Mechanical Stress on Analog and RF Performances of SOI MOSFETs
Autorzy:
Emam, M.
Houri, S.
Vanhoenacker-Janvier, D.
Raskin, J.-P.
Powiązania:
https://bibliotekanauki.pl/articles/308245.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cut-off frequency fT
intrinsic gain
mechanical stress
piezoresistance coefficient
SOI MOSFET
Opis:
This paper presents a complete study of the impact of mechanical stress on the performance of SOI MOSFETs. This investigation includes dc, analog and RF characteristics. Parameters of a small-signal equivalent circuit are also ex- tracted as a function of applied mechanical stress. Piezoresistance coefficientis shown to be a key element in describing the enhancement in the characteristics of the device due to mechanical stress.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 18-24
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the mechanical fatigue progress on the magnetic properties of electrical steel sheets
Autorzy:
Karthaus, J.
Steentjes, S.
Gröbel, D.
Andreas, K.
Merklein, M.
Hameyer, K.
Powiązania:
https://bibliotekanauki.pl/articles/141347.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cyclic mechanical stress
electrical machines
electrical steel sheets
magnetic properties
material fatigue
Opis:
The purpose of this paper is to study the variation of the magnetic properties of non-oriented electrical steel sheets with the fatigue state during cyclic mechanical loading. The obtained results are central to the design of variable drives such as traction drives in electric vehicles in which varying mechanical loads, e.g. in the rotor core (centrifugal forces), alter the magnetic properties. Specimens of non-oriented electrical steel are subject to a cyclically varying mechanical tensile stress with different stress amplitudes and number of cycles. The specimens are characterised magnetically at different fatigue states for different magnetic flux densities and magnetising frequencies. The measurements show a variation in magnetic properties depending on the number of cycles and stress magnitude which can be explained by changes in the material structure due to a beginning mechanical fatigue process. The studied effect is critical for the estimation of the impact of mechanical material fatigue on the operational behaviour of electrical machines. Particularly in electrical machines with a higher speed where the rotor is stressed by high centrifugal forces, material fatigue occurs and can lead to deterioration of the rotor’s stack lamination.
Źródło:
Archives of Electrical Engineering; 2017, 66, 2; 351-360
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibile Applications of Magnetic Microwires in Aviation
Autorzy:
Draganová, K.
Blažek, J.
Praslička, D.
Kmec, F.
Powiązania:
https://bibliotekanauki.pl/articles/97841.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
aviation
magnetic microwires sensors
magnetic field sensors
mechanical stress sensors
temperature sensors
Opis:
Magnetic microwires have been rediscovered due to a number of the unusual magnetic properties and their potential applications. The paper concerns glass-coated magnetic microwires composed of a ferromagnetic metallic core with a diameter of 0.6 – 30 μm and of a glass coat with a thickness of 2 – 20 μm. The fabrication process and magnetic properties of these microwires are described. Due to their unique properties microwires can be used as a sensing element of sensors. Microwire-based sensors can be used in a wide range of aviation applications as magnetic field sensors, tensile stress sensors or temperature sensors. The main advantages of microwire-based sensors are associated with their small dimensions and weight, which play a very important role in aviation.
Źródło:
Fatigue of Aircraft Structures; 2013, 5; 12-17
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plant responses to a grafting process on the example of Arabidopsis thaliana hypocotyl during in vitro culture
Autorzy:
Sala, K.
Kurczynska, E.
Powiązania:
https://bibliotekanauki.pl/articles/951223.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
micrografting
Arabidopsis thaliana
grafting
hypocotyl
in vitro culture
cotyledon
mechanical stress
morphological change
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of thermal-mechanical stress on the insulation system of a low voltage electrical machine
Autorzy:
Yang, Liguo
Pauli, Florian
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/1841343.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
insulation system
material fatigue
thermal-mechanical stress
system izolacji
zmęczenie materiału
naprężenie cieplno-mechaniczne
Opis:
Varying ohmic loss in the winding of electrical machines, which are operated atvarious operating points, results in temperature changes during operation. Particularly, when the temperature is varying dynamically, the insulation system suffers from repeated thermal-mechanical stress, since the thermal expansion coefficients of the insulating materials and copper conductors are different. For the appropriate design of an insulation system, the effect of thermal-mechanical stress must be known. In the present work, motorettes are subjected to repeated thermal cycles. The expected lifetime is estimated and compared to the life time which is achieved by applying a lifetime-model which only considers thermal aging while ignoring thermal-mechanical stress effects. In addition, the hotspot temperature is simulated, the lifetime at the hotspot is estimated as the worst case. As expected, the results indicate that the thermal-mechanical stress plays a significant role during dynamic thermal aging of the winding insulation system. To better understand the thermal-mechanical stress effect, the resulting thermal-mechanical stress in a single wire is analyzed by the finite element method. A preliminary analysis of the aging mechanism of materials due to cyclic thermal-mechanical stress is performed with the theory of material fatigue.
Źródło:
Archives of Electrical Engineering; 2021, 70, 1; 233-244
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical stress-induced reorganization of the root stem cell niche of Arabidopsis seedlings cultured in vitro
Autorzy:
Potocka, I.
Powiązania:
https://bibliotekanauki.pl/articles/951229.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical stress
root system
stem cell
niche
root meristem
Arabidopsis thaliana
root apical meristem
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 69

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