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Tytuł:
Research on the influence of power frequency electric field of pantograph on passengers’ health in high-speed EMU
Autorzy:
Tian, Rui
Zhang, Jia-Qi
Lu, Mai
Powiązania:
https://bibliotekanauki.pl/articles/24202736.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
induced current density
induced electric field intensity
high-speed EMU
pantograph
power frequency electric field
Opis:
In this work we discussed the safety of the electric field environment in the No. 3 carriage where the pantograph is located. DSA380 pantograph, CRH5 EMU carriage and passengers’ models were established to study the electric field exposure of passengers at different positions. The results showed that Emax in the carriage without passengers is 1.173 x 10 6 mV/m. Then we set the passengers’ positions according to the electric field distribution in the carriage without passengers and obtained that Emax in the carriage with passengers is 3.195 x 10 6 mV/m. It can be seen that the maximum induced electric field intensity of passengers at different positions appears on the soles of shoes, the maximum value is 3.028 x 105 mV/m, the maximum induced current density occurs at the ankle, its maximum value is 3.476 x 10 -5 A/m 2. It can be concluded that the maximum induced electric field intensity of passenger’s head appears in the cerebrospinal fluid area, with a maximum value of 202.817 mV/m, and the maximum induced electric field intensity of passenger’s head at the door is larger than that in the middle of the carriage. The maximum values of the induced electric field intensity in all tissues of passengers are much smaller than the basic limits of electromagnetic exposure to the public set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). This study indicated that the pantograph has little influence on the electric field environment in the carriage under working state, and will not cause any health hazard to the passengers in this working frequency electric field environment.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 483--501
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The thermal characteristics of ACCR lines as a function of wind speed – an analytical approach
Autorzy:
Zaręba, Marek
Gołębiowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2173672.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind speed
transient temperature field
steady temperature field
ACCR line
mathematical modeling
prędkość wiatru
pole temperatury stacjonarne
pole temperatury niestacjonarne
linia ACCR
modelowanie matematyczne
Opis:
The paper has investigated the effect of wind speed on selected thermal characteristics of the contemporary ACCR line. As wind speed functions, heating curves, stationary temperature profiles, steady-state current ratings and thermal time constants, have been determined. The composite core (Al–Al2O3) and the Al–Zr alloy braid were modeled as porous solids. As a result, the physical model is composed of a solid cylinder and a hollow cylinder with different material parameters of the above-mentioned elements. The mathematical model was formulated as the boundary-initial problem of the parabolic heat equation. The problem was solved by the state-superposition of and variable-separation method. On this basis, a computer program was developed in the Mathematica 10.4 environment and the velocity characteristics sought for were plotted. The results obtained analytically were positively verified by the finite-element method in the NISA v.16 environment. The physical interpretation of the determined characteristics has been given.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e141006
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Device for Measuring the Rotational Speed of a Chain Sprocket of a Petrol Chainsaw
Autorzy:
Wróbel, Mateusz
Jakubek, Bartosz
Rukat, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2123289.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
magnetic field
chainsaw
rotational speed measurement
chain sprocket
hall effect sensor
Opis:
The procedure for determining the frequency-weighted RMS values of vibration accelerations in the case of petrol chainsaws proposes equal time shares of three operation modes of the chainsaw. In order to assess the actual operator’s vibration exposure, it is necessary to precisely determine the above-mentioned shares. In real-life conditions operation of chainsaws is characterized by frequent and significant rotational speed changes depending on the operation mode. Therefore, a prototype of dedicated device for measuring the rotational speed of a chain sprocket was developed. The article presents development requirements, encountered problems and their solutions, the prototype itself and functional test results.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 99--107
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and theoretical study on the dynamic ejection process of a rock burst under a static load
Autorzy:
Zheng, Weiyu
Powiązania:
https://bibliotekanauki.pl/articles/1853901.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
skała
energia kinetyczna
pęknięcie
rock burst
high-speed camera
kinetic energy
stress field
crack propagation
Opis:
As the duration of a rock burst is very short and the roadway is seriously damaged after the disaster, it is difficult to observe its characteristics. In order to obtain the dynamic characteristics of a rock burst, a modified uniaxial compression experiment, combined with a high-speed camera system is carried out and the process of a rock burst caused by a static load is simulated. Some significant results are obtained: 1) The velocity of ejected particles is between 2 m/s and 4 m/s. 2) The ratio of elastic energy to plastic energy is about five. 3) The duration from integrity to failure is between 20 ms and 40 ms. Furthermore, by analyzing the stress field in the sample with a numerical method and crack propagation model, the following conclusions can be made: 1) The kinetic energy of the ejected particles comes from the elastic energy released by itself. 2) The ratio of kinetic energy to elastic energy is between 6% and 15%. This can help understand the source and transfer of energy in a rock burst quantitatively.
Źródło:
Archives of Mining Sciences; 2021, 66, 1; 43-56
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensorless field oriented control for five-phase induction motors with third harmonic injection and fault insensitive feature
Autorzy:
Wilczyński, Filip
Strankowski, P.
Guziński, J.
Morawiec, M.
Lewicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/200614.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fault tolerant control
field oriented control
five-phase induction machine
speed observer
third harmonic flux injection
kontrola tolerancji błędu
pięciofazowa maszyna indukcyjna
obserwator prędkości
Opis:
The paper presents a solution for sensorless field oriented control (FOC) system for five-phase induction motors with improved rotor flux pattern. In order to obtain the advantages of a third harmonic injection with a quasi-trapezoidal flux shape, two vector models, α1–β1 and α3–β3, were transformed into d1– q1, d3– q3 rotating frames, which correlate to the 1st and 3rd harmonic plane respectively. A linearization approach of the dual machine model in d – q coordinate frames is proposed by introducing a new additional variable “x” which is proportional to the electromagnetic torque. By applying the static feedback control law, a dual mathematical model of the five-phase induction motor was linearized to synthesize a control system in which the electromagnetic torque and the rotor flux can be independently controlled. The results shows the air gap flux shape in steady as well transient states under various load conditions. Moreover, the implemented control structure acquires fault tolerant properties and leads to possible emergency running with limited operation capabilities. The fault-tolerant capability of the analyzed machine was guaranteed by a special implemented control system with a dedicated speed observer, which is insensitive to open-phase fault situation. The experimental tests have been performed with single and double-open stator phase fault. A torque measurement was implemented to present the mechanical characteristics under healthy and faulty conditions of the drive system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 253-262
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic performance of estimator-based speed sensorless control of induction machines using extended and unscented Kalman filters
Autorzy:
Horváth, K.
Kuslits, M.
Powiązania:
https://bibliotekanauki.pl/articles/1193590.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
induction machine
speed sensorless control
field-oriented control
FOC
non-linear state estimation
load torque estimation
extended Kalman filter
EKF
unscented Kalman filter
UKF
Opis:
This paper presents an estimator-based speed sensorless field-oriented control (FOC) method for induction machines, where the state estimator is based on a self-contained, non-linear model. This model characterises both the electrical and the mechanical behaviours of the machine and describes them with seven state variables. The state variables are estimated from the measured stator currents and from the known stator voltages by using an estimator algorithm. An important aspect is that one of the state variables is the load torque and, hence, it is also estimated by the estimator. Using this feature, the applied estimator-based speed sensorless control algorithm may be operated adequately besides varying load torque. In this work, two different variants of the control algorithm are developed based on the extended and the unscented Kalman filters (EKF, UKF) as state estimators. The dynamic performance of these variants is tested and compared using experiments and simulations. Results show that the variants have comparable performance in general, but the UKF-based control provides better performance if a stochastically varying load disturbance is present.
Źródło:
Power Electronics and Drives; 2018, 3, 38; 129-144
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the operational performance of high speed permanent magnet generator with controlled rectifier in distributed generation
Autorzy:
Hongbo, Q.
Yanqi, W.
Cunxiang, Y.
Kaiqiang, H.
Powiązania:
https://bibliotekanauki.pl/articles/140696.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high speed permanent magnet generator
controlled rectifier
electromagnetic field
switching frequency
Opis:
The uncontrolled rectifier and controlled rectifier which use fixed switching frequency control strategy are applied usually during the working of a high-power high- speed permanent magnet generator (HSPMG). Even for the controlled rectifier, it will generate harmonics. The electromagnetic performance of the HSPMG is also affected by these harmonics. In this paper, the influences of the fixed switching frequency control strategy on a HSPMG were studied. Based on the Fourier theory, the harmonic currents of the generator were analyzed, and the change of harmonic distribution range and current total harmonic distortion (THD) were obtained. By using an indirect field-circuit coupling method, the influences of the fixed switching frequency control strategy on the losses and torque of the generator were analyzed. The relations between the switching frequency and the losses and torque of the generator were obtained, and the change mechanism of the loss was revealed. The obtained conclusions can provide reference for the optimized choice of the switching frequency of the distributed generation system with the HSPMG. It can also provide support for the HSPMG electromagnetic structural optimization and the optimization of the loss and harmonic on the system level.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 899-913
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of hierarchical structures for design of high-speed digital comparators on FPGA/SoC
Autorzy:
Salauyou, V.
Powiązania:
https://bibliotekanauki.pl/articles/114377.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
comparator
high-speed
hierarchical structures
system on chip
field programmable logic array
FPGA
SoC
Opis:
This paper presents a design method of high-speed digital comparators on FPGA/SoC by means of hierarchical structures. A synthesis technique of hierarchical structures for comparators is offered. In this technique, the comparator best hierarchical structure is empirically found for a certain FPGA family. The proposed method allows reducing a delay for 256-bits comparators by 1.245 to 2.516 times as compared with a traditional approach, and for 512-bits comparators by 3.399 times. The method also allows reducing an area by 40.2% on occasion.
Źródło:
Measurement Automation Monitoring; 2016, 62, 6; 196-198
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field study of film spreading on a sea surface
Autorzy:
Korinenko, A.E.
Malinovsky, V.V.
Powiązania:
https://bibliotekanauki.pl/articles/49188.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
oil spill
film spreading
sea surface
sea pollution
field study
coastal zone
Baltic Sea
wind speed
temporal dynamics
hydrometeorological parameter
Źródło:
Oceanologia; 2014, 56, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Speed control of multiphase cage induction motors incorporating supply sequence
Autorzy:
Drozdowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/141418.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiphase cage induction motor
supply sequence
speed control
multiphase voltage source inverter
field oriented control
Opis:
The subject of this paper is the control possibility of the multiphase cage induction motors having number of phases greater than 3. These motors have additional properties for speed control that distinguish them from the standard 3 phase motors: operation at various sequences of supplying voltages due to the inverter control and possible operation with few open-circuited phases. For each supply sequence different no load speeds at the same frequency can be obtained. This feature extends the motor application for miscellaneous drive demands including vector or scalar control. This depends mainly on the type of the stator winding for a given number of phases, since the principle of motor operation is based on co-operation of higher harmonics of magnetic field. Examples of operation are presented for a 9-phase motor, though general approach has been discussed. This motor was fed by a voltage source inverter at field oriented control with forced currents. The mathematical model of the motor was reduced to the form incorporating all most important physical features and appropriate for the control law formulation. The operation was illustrated for various supply sequences for “healthy” motor and for the motor operating at one phase broken. The obtained results have shown that parasitic influence of harmonic fields interaction has negligible influence on motor operation with respect to the useful coupling for properly designed stator winding.
Źródło:
Archives of Electrical Engineering; 2014, 63, 4; 511-534
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wysokości belki polowej i ciśnienia cieczy użytkowej na znoszenie sedymentacyjne
Influence of the height of a field toolbar and utility liquid pressure on sedimentation drift
Autorzy:
Świechowski, W.
Hołownicki, R.
Godyń, A.
Doruchowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/289674.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
znoszenie cieczy
belka polowa
rozpylacz
ciśnienie cieczy
wiatr
spray drift
field toolbar
nozzles
liquid pressure
wind speed
Opis:
Celem prezentowanych badań było określenie wpływu wysokości belki polowej i ciśnienia roboczego na znoszenie sedymentacyjne cieczy użytkowej. W testach polowych użyto opryskiwacz zawieszany, wyposażony w belkę polową o szerokości roboczej 12 m i rozpylacze Lechner LU 120-03. Zabiegi opryskiwania prowadzono na odcinku testowym o długości 60 m i szerokości roboczej opryskiwacza. Dla każdej kombinacji wysokości belki polowej (0,35; 0,5; 0,75 m) i ciśnienia roboczego (0,15; 0,3; 0,5 MPa) wykonano 5 przejazdów odcinka testowego, nanosząc brylant sulfoflawiny ze stałą prędkością roboczą 6,0 km·h-1. Wyniki badań potwierdzają istotny wpływ wysokości belki, ciśnienia cieczy i prędkości wiatru na ilość znoszonej cieczy. Niskie prowadzenie belki 0,35 m i zredukowane ciśnienie do 0,15 MPa zmniejszyło znoszenie o 50% w stosunku do standardowej techniki opryskiwania (wysokość belki 0,5 m ciśnienie 0,3 MPa) już w odległości 3 m od odcinka testowego. Nadmierna wysokość belki 0,75 m i podwyższone ciśnienie do 0,3 MPa przy prędkości wiatru 2,4 m.s-1 zwiększa znoszenie cieczy o ponad 75%. Największy przyrost znoszenia odnotowano dla ciśnienia 0,5 MPa i wysokości belki 0,75 m.
The objective of the presented research was to determine the effect of a spray boom height and utility liquid pressure on downwind spray drift deposited on the ground. In the field experiment a field crop sprayer was used with 12 m spray boom and LU 120-03 flat-fan nozzles. During the tests the spray was applied on the 60 m long area and as wide as the sprayer. For each combination of the spray boom height (0.35; 0.5; 0.75 m) and operational pressure (0.15; 0.3; 0.5 MPa) 5 applications (replications) were carried out with BSF fluorescent dye, at driving velocity 6.0 km·h-1. The results confirmed a significant influence of the spray boom height, liquid pressure and wind speed on spray drift. The treatments with low spray boom at 0.35 m and at low pressure 0.15 MPa resulted in drift reduction by 50% to 3 m downwind of the sprayed crop, compared to the reference application parameters: spray boom height 0.5 m and liquid pressure 0.3 MPa. The excessive height of the toolbar 0.75 m and medium pressure 0.3 MPa, applied at wind speed 2.4 m.s-1 increased spray drift by 75%. The highest drift was observed for the spray boom height 0.75 m and liquid pressure 0.5 MPa.
Źródło:
Inżynieria Rolnicza; 2013, R. 17, nr 3, t. 2, 3, t. 2; 389-397
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of prototype multi-pole non-salient field winding for high speed brushless synchronous generator
Autorzy:
Kutt, F.
Kostro, G.
Michna, M.
Ronkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813550.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
synchronous generator
non-salient field winding
high speed
brushless excitation
autonomous electrical power system
Opis:
In this paper a non-salient field winding for a brushless synchronous generator working with high speed in an autonomous energy generation system (e.g. airplane power grid) has been presented. A conception of a six-pole cylindrical-rotor with distributed field winding has been proposed. Comparison study of salient and prototype non-salient field winding has been carried out. Chosen simulation and measurement results of the generator stator voltage and current waves have been presented.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 273-278
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of potato tubers before planting in a magnetic field
Autorzy:
Sinyavsky, A.
Savchenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/410889.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
pole magnetyczne
indukcja magnetyczna
bioelektromagnetyzm
bulwa ziemniaka
przenośniki
magnetic field
magnetic treatment of potatoes
magnetic induction
speed of the conveyor
biopotential
Opis:
The results of research on the impact parameters of treatment of potato tubers in a magnetic field to change their biopotential and yield are presented. The optimum regimes of treatment were determined.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 2; 49-52
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of ASCAT wind measurements and the HIRLAM model over the Baltic Sea
Autorzy:
Sluzenikina, J.
Mannik, A.
Powiązania:
https://bibliotekanauki.pl/articles/48369.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
backscattering
Baltic Sea
HIRLAM model
numerical weather prediction
ocean surface
sea surface
stormy season
wind direction
wind field
wind scatterometer
wind speed
Opis:
This paper presents a comparison of the wind data measured by the ASCAT polar-orbiting satellite scatterometer and winds forecast by the numerical weather prediction model HIRLAM in the Baltic Sea region during the stormy season in 2009. Two different resolution models were used in the comparison. Mutual quality and uncertainty characteristics of the measurements and predictions are determined. The results of the study show that the ASCAT wind data are well correlated with the HIRLAM predicted winds, which raises the credibility of both data sources in operational and hindcasting applications over the Baltic Sea. A case of phase error in a HIRLAM forecast of cyclonic activity over the Baltic Sea is discussed.
Źródło:
Oceanologia; 2011, 53, (1-TI)
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania pocisków fragmentujących
Investigations of frangible bullets
Autorzy:
Janiszewski, J.
Rutyna, K.
Surma, Z.
Furmanek, W.
Powiązania:
https://bibliotekanauki.pl/articles/210267.pdf
Data publikacji:
2007
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
amunicja o ograniczonej strefie rażenia
pociski fragmentujące
amunicja bezołowiowa
badania materiałowe
fotografia bardzo szybkich procesów
amunition of limited field of fire
frangible bullets
non-lead ammunition
material investigations
high-speed photography
Opis:
Artykuł jest poświęcony opracowanym w WAT pistoletowym pociskom fragmentującym, które wytworzono metodą metalurgii proszków. W pierwszej części pracy dokonano prezentacji wyników badań nad technologią wytwarzania pistoletowej amunicji fragmentującej z proszków Cu i Sn. W drugiej części artykułu przedstawiono wyniki badań fragmentacji pocisków pistoletowych po zderzeniu z wybranymi rodzajami tarcz. Do oceny fragmentacji pocisków wykorzystano metodę odzyskiwania odłamków na aramidowych materiałach wyhamowujących oraz fotografię kadrową. Rezultaty badań dowodzą, że pociski pistoletowe wytwarzane wstępnie opracowaną technologią charakteryzują się bardzo dobrą zdolnością do fragmentacji po uderzeniu w tarczę wykonaną z blachy stalowej o grubości 1 mm i całkowitą destrukcją po uderzeniu w twardą przegrodę.
The paper concerns the frangible bullets developed at the Military University of Technology by using powder metallurgy. The results of the technological investigation related to the frangible bullets manufactured from Cu-Sn powders are reported in the first part of the paper, whereas in the second one, the impact behavior results of the Cu-Sn frangible bullets upon hit selected targets are presented. To estimate frangibility of the tested bullets, the “fragments recovery” technique and the optical record method were used. It was found that the developed frangible bullets are characterized by high fragmentation capability upon impact against 1-mm steel sheet and by total disintegration upon impact on hard steel target.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2007, 56, 2; 7-28
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
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