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Tytuł:
Stator current spectrum analysis of a double cage induction motor with rotor asymmetry
Autorzy:
Tulicki, Jarosław
Sobczyk, Tadeusz Jan
Sułowicz, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/24202742.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
cage asymmetry
double cage induction motor
harmonic balance method
steady-state analysis
stator current Fourier spectra
Opis:
This study presents a method to directly calculate the stator current Fourier spectra in double-cage induction motors to diagnose faults in rotor cages. A circuit model is developed for this purpose, allowing the modelling of any asymmetry in the outer and inner rotor cages. The model extends the conventional model of a cage motor by considering the higher space harmonics generated by the stator windings. The asymmetry of the cages is modelled by growing the resistance of any of the rotor bars. This results in various model equations, to be solved by looking for diagnostic signals. Motor current signature analysis is typically used to diagnose cage motors based on the Fourier spectra of the stator currents during steady-state operation. This study determines these spectra for double cage motors using the harmonic balance method, omitting the transient calculations. The calculation results confirmed the sensitivity of the stator current Fourier spectra as a diagnostic signal to distinguish faults in the outer and inner cages.
Źródło:
Archives of Electrical Engineering; 2023, 72, 2; 357--371
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of semi-automated calibration system for pressure balances
Autorzy:
Türk, Ahmet
Hamarat, Abdullah
Durgut, Yasin
Powiązania:
https://bibliotekanauki.pl/articles/2173904.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
semi-automated calibration
pressure balance
digital manometer assisted method
Opis:
In this study, a digital manometer was used as a transfer standard to perform calibration of a pneumatic pressure balance. The same pressure balance was calibrated with the cross-floating method based on falling rate determination (FRD). Average of differences among the effective area results show an agreement of less than 10 ppm between the digital manometer-assisted calibration (DMAC) method and the FRD method. The method in which a digital pressure gauge is used as a transfer standard not only facilitates calibration but also enables the automation of pressure balance calibration. Full automation of pressure balance calibration requires an automatic mass loading system for both the reference instrument and the device under test. Since there is a lot of different kinds of pressure balances, it is nearly impossible for a pressure metrology laboratory to have an automatic mass-handler system for every type of pressure balance. Therefore, a more efficient way in which automated mass-handler systems are not required .., a semi-automatic calibration system, is designed. For that purpose, two different calibration procedures, increasing-decreasing cycles, and pressurize-vent (P-V) procedures are performed and compared. The equivalence of procedure results makes the semi-automated calibration design of pressure balances possible. The most distinguishing advantages of a semi-automated calibration system are the applicability to any type of pressure balance and low cost compared to full automation.
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 623--638
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and theoretical study of the reinforced concrete flat slabs with the central support loss
Autorzy:
Tur, Viktar
Tur, Andrei
Lizahub, Aliaksandr
Powiązania:
https://bibliotekanauki.pl/articles/2172407.pdf
Data publikacji:
2022
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
flat slab
robustness
resistance mechanism
membrane action
dynamic resistance
energy balance method
płaska płyta
krzepkość
mechanizm oporowy
działanie membranowe
opór dynamiczny
metoda bilansu energetycznego
Opis:
The paper experimentally and theoretically considers the issues of assessing the robustness and resistance to progressive collapse of a flat slab with a sudden removal of the central support. The results of testing two scale models of a fragment of a flat ceiling in the case of removal of the central support under static (specimen FS-1) and dynamic (specimen FS-2) loading are presented and analyzed. A theoretical approach to the quantitative assessment of robustness was tested, which is based on the provisions of the energy balance of a damaged structural system in an accidental design situation.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2022, 4; 12--41
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of geometrically nonlinear clamped uniform rods and rods with sections varying exponentially free vibration
Autorzy:
Abdeddine, E.
Majid, A.
Bouzida, N.
Bouzida, Z.
Zarbane, Kh.
Powiązania:
https://bibliotekanauki.pl/articles/2201031.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
non-linear longitudinal vibration
Lagrange equations
harmonic balance method
linearized approach
drgania nieliniowe
drgania podłużne
równania Lagrange'a
metoda bilansu harmonicznych
podejście linearne
Opis:
Purpose: The present paper is intended to investigate the problem of linear and non-linear longitudinal free vibration of uniform rods and rods whose cross-sections vary exponentially at large vibration amplitudes. Design/methodology/approach: The method adopted consists in discretizing the energy term on linear kij and non-linear rigidity tensor bijkl, as well as the mass tensor mij. Therefore, the formulation of this structure is based on Lagrange equations and the harmonic balance method so as to obtain the nonlinear algebraic equations. These latter are solved numerically and analytically through the explicit and linearized method. Findings: The response of Clamped-Clamped uniform and non-uniform rods on our structure are highlighted in the amplitude frequency and associated first three mode shapes. Moreover, this research leads to study the influence of the exponential slope on the maximum displacement, thus emphasizing the non-uniform bars usefulness. The obtained results are then compared with the available literature with a view to validating this theory. Research limitations/implications: As a perspective, the method used in this paper would be pushed to study the FDM material, taking into account other parameters related to additive manufacturing, and later to be validated experimentally. Practical implications: Longitudinal vibrations are important in mechanical structures; therefore, the determination of their dynamic behaviour needs to be understood. In the present study, the effect of the displacement amplitude on the exponential slope of the structure was analysed, which led to the determination of the reduction range of the vibration amplitude under resonance. However, this should be taken into account in the design process. Besides, the usefulness of the non-linearity geometric effects was demonstrated to examine these structures by considering all the parameters involved. Originality/value: A linearized procedure is used to solve a nonlinear algebra equation. The use of this method leads to reduce calculation time contrary to iterative methods.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 112, 2; 49--63
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strategic analysis of the Arms Company
Autorzy:
Oziębło, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2201547.pdf
Data publikacji:
2022
Wydawca:
Towarzystwo Wiedzy Obronnej
Tematy:
strategic analysis
PEST method
Porter five forces method
strategic balance
SWOT/TOWS analysis
analiza strategiczna
metoda PEST
metoda pięciu sił Portera
analiza SWOT/TOWS
Opis:
The main objective of the article is to conduct a strategic analysis of an arms company from the defense industry sector selected from a group of companies belonging to Polska Grupa Zbrojeniowa S.A. The article attempts to verify the following research hypothesis: It should be presumed that the appropriate selection of methods of strategic analysis contributes to a more objective determination of the development potential of an entity from the arms industry. This can lead to stable company development and increase the competitiveness of arms companies. A strategic analysis of the company was conducted based on the PEST method, Porter's five forces method, strategic balance and SWOT/TOWS analysis. A synthesis of the findings of the research methods used was made.
Źródło:
Wiedza Obronna; 2022, 3; 235--264
0209-0031
2658-0829
Pojawia się w:
Wiedza Obronna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling damaged precast structural system when its robustness check
Autorzy:
Tur, Viktar
Tur, Andrei
Lizahub, Aliaksandr
Powiązania:
https://bibliotekanauki.pl/articles/1819317.pdf
Data publikacji:
2021
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
robustness
resistance mechanism
progressive collapse
dynamic resistance
energy balance method
EBM
krzepkość
mechanizm oporowy
postępujące zawalenie
opór dynamiczny
metoda bilansu energetycznego
Opis:
Within the framework of traditional approaches to checking for resistance of reinforced concrete buildings and structures to the progressive collapse development, membrane (chain) forces in a damaged structural system are calculated separately, without considering its non-linear bending behavior during the formation of the plastic hinges and without checking the possibility of achieving large deflections. The authors propose an approach to modelling a nonlinear quasi-static reaction of a damaged structural system in an accidental design situation. This approach considers non-linear bending and the resistance of reserved horizontal ties, considering their ultimate ductility. The authors verified the proposed approach based on the results of experimental studies by others researchers. An example of the application of the proposed approach in assessing the robustness of a structural system made of precast concrete with a sudden removal of the central column is considered. In accordance with the provisions of the energy approach, an analysis is made of the contribution of individual resistance mechanisms to the total quasi-static and dynamic resistance of the damaged structural system. We show that the proposed calculation model adequately describes the behavior of a damaged structural system in an accidental design situation, and therefore to carry out parametric studies and check the robustness of building structures.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2021, 3; 63--81
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research methods in the study of heat transfer coefficient during flow in minichannels
Autorzy:
Tychanicz-Kwiecień, Maria
Grosicki, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/1819147.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
heat transfer coefficient
minichannels
heat and mass transfer analogy
limiting current technique
thermal balance method
współczynnik przenikania ciepła
minikanały
analogia wymiany ciepła i masy
prąd graniczny
bilans cieplny
Opis:
The paper presents the specification of research methods commonly encountered in the studies of heat transfer processes in minichannels. In particular the following methods have been emphasized: electrochemical limiting current method as well as the thermal balance method. In thermal balance method the mean heat transfer coefficient is determined by the set of experimental thermal measurements of the investigated heat exchanger. In turn, limiting current method is based on heat and mass transfer analogy. The discussed research methods have been implemented on two specially designed and constructed test facilities with compact minichannel heat exchangers, which have been presented and described in details. In order to validate the designed setup, the preliminary experimental measurements of two minichannel heat exchangers with hydraulic diameter of 2 mm and rectangular cross sections during single-phase liquid flows have been carried out. In further perspective it is planned to extend the experimental studies of minichannel heat exchangers and to compare the results obtained by both methods described.
Źródło:
Journal of Mechanical and Energy Engineering; 2021, 5, 1; 59--68
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simplified analytical method for the robustness assessment of precast reinforced concrete structural systems
Autorzy:
Tur, Viktar
Tur, Andrei
Lizahub, Aliaksandr
Powiązania:
https://bibliotekanauki.pl/articles/1955933.pdf
Data publikacji:
2021
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
robustness
dynamic resistance
ties
energy balance method
membrane effect
Opis:
The article presents the simplified implementation of alternative load path method based on the energy balance approach. This method should be used to check the global resistance of a damaged structural system after the occurrence of an accidental event. Basic assumptions of simplified analytical models for modelling resistance of horizontal ties in a damaged structural system, taking into account the membrane (chain) effects, were presented. An approach to modelling the dynamic resistance of a damaged structural system based on the energy balance method is described. Calculated dependencies for checking the robustness of a prefabricated multi-storey building with hollow-core slabs after the loss of the central column are proposed and considered using an example. On the considered example, a comparison of the required tie sections area with the dynamic resistance designed using the energy balance method (EBM) and according to the current standards, and a statistical assessment of the reliability of the load-bearing capacity models are carried out. In the end, a brief algorithm for the simplified calculation of the dynamic resistance of a damaged structural system is proposed.
Źródło:
Budownictwo i Architektura; 2021, 20, 4; 93-114
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of body balance of patients treated with the Ilizarov method for tibial nonunion
Autorzy:
Pajchert-Kozłowska, Andżelika
Pawik, Łukasz
Szelerski, Łukasz
Żarek, Sławomir
Górski, Radosław
Pawik, Malwina
Fink-Lwow, Felicja
Morasiewicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/27324128.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
body balance
pedobarography
nonunion
tibia
Ilizarov method
równowaga ciała
pedobarografia
brak zjednoczenia
piszczel
Metoda Ilizarowa
Opis:
Purpose: The biomechanics of the musculoskeletal system in patients after tibial nonunion treatment using the Ilizarov method have not yet been fully explored. From the orthopaedic and patient point of view, after the treatment, an assessment should be carried out of the biomechanics of the musculoskeletal system. The aim of this study was to assess the body balance of patients treated with the Ilizarov method for tibial nonunion. Methods: The research group included 24 individuals with a mean age of 55 years, who were treated for aseptic tibial nonunion with the Ilizarov method. The control group was matched to the study group in terms of gender and age, and consisted of 32 subjects with a mean age of 50.5 years and no significant medical history. This study evaluated the balance of patients with the use of pedobarography. Results: In the control group, a statistically significantly shorter path of centre of gravity was observed. There were no statistical differences between the study and control groups for the field area of the centre of gravity. There were no statistical differences between the study and control groups for the minor axis length or major axis length of the centre of gravity. There was a relationship between the centre of pressure path length and the age of the participants in both the control group and the study group. Conclusions: Treatment of patients with tibial nonunion with the Ilizarov fixator achieves similar balance to healthy volunteers. In the pedobarographic evaluation, patients treated for tibial nonunion using the Ilizarov method had similar statics of the musculoskeletal system to healthy volunteers.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 3; 131--137
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena stanu górnictwa węgla kamiennego w Polsce w latach 2016-2018 przy wykorzystaniu metody bilansu dochodów publicznych
Evaluation of the situation of hard coal mining in Poland in 2016-2018 using the public income balance method
Autorzy:
Krawczyk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/164868.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
górnictwo węgla kamiennego w Polsce
metoda bilansu dochodów publicznych
płatności publicznoprawne
hard coal mining in Poland
income balance method
public payments
Opis:
Artykuł jest kontynuacją wcześniejszych prac prowadzonych w Głównym Instytucie Górnictwa w Katowicach nad oceną stanu górnictwa węgla kamiennego w Polsce, które obejmowały lata 2013-2015. Analizy wykonane metodą bilansu dochodów publicznych uwzględniają płatności publicznoprawne ponoszone przez branżę górniczą i jej bezpośrednie otoczenie społeczno- gospodarcze. Metoda bilansu dochodów publicznych w przeciwieństwie do „klasycznej” ekonomii oceniającej działalność gospodarczą na podstawie osiąganych zysków zakłada, że ilościowym miernikiem interesu społecznego jest dochód publiczny, na który składają się różnego rodzaju daniny publiczne, głównie podatki. W artykule przedstawiono wyniki porównania wysokości kosztów operacyjnych i zysków (strat) generowanych przez spółki węglowe w latach 2016-2018 ze strumieniami pieniężnymi, które w wyniku ich działalności wracają do funduszy publicznych w formie podatków, płatności i innych danin. Wykazano znaczne obciążenie górnictwa daninami publicznoprawnymi oraz wrażliwość tej branży na zmienną koniunkturę na światowych rynkach surowców energetycznych, w tym węgla. Zwrócono również uwagę na szczególne znaczenie branży węgla kamiennego dla polityki społecznej i bezpieczeństwa surowcowego kraju. Uzyskane wyniki analiz wskazują, że polskie górnictwo również w latach niskich cen na rynku węgla przysparza polskiej gospodarce wymierne korzyści. Potwierdza to celowość dalszego funkcjonowania górnictwa w Polsce, jednak przy założeniu prowadzenia efektywnych działań restrukturyzacyjnych, których wynikiem będą niższe koszty produkcji węgla.
The paper is a continuation of previous work carried out at the Central Mining Institute in Katowice on the assessment of the situation of hard coal mining in Poland in 2013-2015. The analyzes were made with use of the public income balance method take into account public law payments incurred by the mining industry and its direct socio-economic environment. The public income balance method, in contrast to the „classical” economy assessing economic activity on the basis of profits, assumes that the quantitative measure of public interest is public income, which consists mainly of taxes and parabudgetic funds. The article presents the results of a comparison of the amount of operating costs and profits or losses generated by coal companies in 2016-2018 with cash flows, which as a result of their activities return to public funds as taxes, payments and other levies. A significant burden of mining with public levies and the industry’s sensitivity to changing economic conditions on global energy commodity markets, including coal, have been demonstrated. Attention was also paid to the special importance of this industry for the social policy and raw material security of the country. The results of the analysis show that Polish mining sector distribute measurable benefits in the years of low prices on the coal market. This confirms the desirability of further functioning of the mining industry in Poland, however, assuming effective restructuring activities that will result in lower costs of coal production.
Źródło:
Przegląd Górniczy; 2020, 76, 4; 44-54
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prosty sposób przybliżonego określania przepuszczalności horyzontu gazowego na podstawie danych okresu przypływu i bilansu masy gazu
How to approximate the permeability of the gas zone using the gas flowing pressure data and the mass balance
Autorzy:
Szpunar, Tadeusz
Budak, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1833982.pdf
Data publikacji:
2020
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
metoda standardowa
wykres ciśnienia dennego
przepuszczalność skały
skin efekt
bilans masy
modelowanie matematyczne
standard method
drowndown pressure curve
rock permeability
skin effect
mass balance
mathematical modelling
Opis:
The routine procedure for evaluation of the permeability and skin of the gas zone consists in flowing the gas well until the bottomhole pressure is nearly stabilized. The pressure values must be recorded versus time of flow, initial reservoir pressure must be known and the constant flow rate should be maintained during the flow test. The permeability and skin are calculated using the straight line approximation of bottomhole pressures versus logarithm of flowing time, and the permeability is calculated using the slope of this line. The standard method for calculation of permeability and skin is known for decades and will not be discussed here. This paper proposes somewhat different technique for calculation of permeability which is based on mathematical model of gas flow in porous rocks given by Szpunar (2001). The total volume of gas produced during the flow period is used for calculation of permeability instead of using the flow rate which is never known precisely. The reliability of the calculated results is checked by comparing the total mass of gas produced during the flow test (evaluated at standard conditions of temperature and pressure) with the mass of gas evacuated from the reservoir predicted by the mathematical model. The article provides calculation examples. Because no data from domestic oil industry was available, the method was tested using the data from technical literature. The discrepancies between the results of both methods are within the acceptable range of a few percent.
Źródło:
Nafta-Gaz; 2020, 76, 12; 895--902
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Method For Estimating The Impact Of Migrants Remittances On The Financial And Economic Development Of A Country
Autorzy:
Chernobay, Liana
Malibroda, Sviatoslav
Powiązania:
https://bibliotekanauki.pl/articles/1402404.pdf
Data publikacji:
2020
Wydawca:
Wyższa Szkoła Ekonomiczno-Humanistyczna w Bielsku-Białej
Tematy:
migration
remittances
estimation
method
GDP
balance of payments
Opis:
The study presents a method for estimating the financial and economic impact of personal remittances on economic development migrants’ origin country. The relevance of the study refers to the high dependence of such countries on migrants' remittances. The developed method includes estimating the share of GDP, internal consumption, savings, imports and net cash flow in the balance of payments caused by remittances impact. Obtained estimation provides evidence of significant positive impact of remittances on receiving countries as their GDP, depending on the country, may decrease even for 5% when remittances drop for 10%.
Źródło:
MIND Journal; 2020, 10; 1-21
2451-4454
Pojawia się w:
MIND Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja systemu czasu pracy w przedsiębiorstwach produkcyjnych
Optimization of the work time system in the production enterprises
Autorzy:
Kozioł, Leszek
Mikos, Anna
Karaś, Anna
Powiązania:
https://bibliotekanauki.pl/articles/414872.pdf
Data publikacji:
2019-03
Wydawca:
Małopolska Wyższa Szkoła Ekonomiczna w Tarnowie
Tematy:
system czasu pracy
metoda pracy
doskonalenie systemu czasu pracy
work–life balance
work time system
work method
work time system improvement
Opis:
Celem artykułu jest prezentacja koncepcji analizy determinant systemu czasu pracy w przedsiębiorstwie oraz przedstawienie narzędzi tej analizy na podstawie wyników badań empirycznych. Analiza czasu pracy nadal pozostaje słabo rozpoznanym zagadnieniem analizy ekonomicznej. Podstawowym problemem badawczym jest identyfikacja luki organizacyjnej, którą można opisać jako różnicę między metodą pracy stosowaną w firmie a stosowanym systemem czasu pracy, jak również wskazanie możliwych sposobów eliminacji tej luki. Przyjęto tezę, która zakłada zgodność między systemem czasu pracy a metodą pracy. Wspomniana w artykule koncepcja metody pracy obejmuje: elementy systemu produkcyjnego, elementy systemu pracy, warunki pracy uwzględniające work–life balance. Systemy te (podsystemy metody pracy) powinny uwzględniać zasadę ekonomiczności działania. Przyjęta procedura analizy (metodologia badawcza) proponowana w artykule obejmuje następujące etapy: identyfikację jednostek organizacyjnych i podstruktur przedsiębiorstwa oraz zastosowanej metody pracy, analizę i ocenę systemu czasu pracy, jak również wskazanie rozwiązań prowadzących do usprawnienia systemu czasu pracy. W oparciu o przyjętą tezę w części empirycznej artykułu przedstawiono wyniki badań w postaci studium przypadku (analiza case study). Opisano i oceniono systemy czasu pracy wraz ze zidentyfikowanymi metodami pracy w przedsiębiorstwach z branż elektrycznej i spożywczej. Wyniki analizy ekonomicznej uzupełniono opiniami kadry zarządzającej i pracowników, które przysłużą się poprawie istniejącego systemu czasu pracy. Metody badawcze, które wykorzystano do realizacji tak nakreślonego celu, to: analiza wcześniejszych wyników badań, analiza ekonomiczna, elementy analizy ergonomicznej, wywiad i ankieta.
The aim of the article is to present the concept of the analysis determinants of the work time system in the enterprise and the display of tools this analysis as well as the presentation of empirical research results. Work time analysis still remains a poorly recognized issue of economic analysis. The basic research problem is the identification of the organizational gap, which can be described as the difference between the working method used in the company and the employed working time system, as well as indication of the possible ways of the gap elimination. A thesis, assuming the correspondence between the working time system and the working method, was adopted. The concept of working method mentioned in the article includes: elements of the production system, elements of the work system, working conditions as a rule and work–life balance. These systems (subsystems of the working method) should take into account the principle of economy of operation. The course of analytical procedure (research methodology, suggested in the article, includes the following stages: identification of organizational units and substructures of the enterprise as well as the applied method of work, analysis and evaluation of the working time system, determination of ways, to improve the working time system. In support of the thesis, the empirical part of the article presents the results of research in the form of a case study (case study analysis). It describes and assesses work time systems together with identified methods of work in the electrical industry enterprise and food industry. The economic analysis results were supplemented with opinions of the management staff and employees, being used to improve the existing working time system. The research methods were used to implement the indicated purpose: the analysis of the prior research results, economic analysis, the elements of ergonomic analysis, interview and questionnaire.
Źródło:
Zeszyty Naukowe Małopolskiej Wyższej Szkoły Ekonomicznej w Tarnowie; 2019, 1(41); 67-80
1506-2635
Pojawia się w:
Zeszyty Naukowe Małopolskiej Wyższej Szkoły Ekonomicznej w Tarnowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static analysis of the tipper semi-trailer frame
Autorzy:
Misiak, J.
Stachura, S.
Powiązania:
https://bibliotekanauki.pl/articles/244712.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
static balance
global static
web local buckling
Finite Element Method
równowaga statyczna
metoda elementów skończonych
Opis:
The article presents a static analysis of the existing three-axle tipper semitrailer using the finite element method. The tipper trailer frame must be strong enough to carry loads from the load while driving, during an accident and especially when emptying the load box when a very large part of the load is pointing at the rear of the frame. Frames are usually made of low-alloy steel with increased strength, most often of grade S355J2G3; duralumin alloy frames are also used. The currently designed semi-trailer frames are becoming more lightweight while the required load capacity and durability are retained. This is possible thanks to the use of computational methods by the engineers in this finite element method. Static analysis allows for the determination of stress and deformation in the loaded frame and also a possible modification of the frame. The aim of the work was to investigate the influence of the position of the crossbar on the level of stress and deformations for three different load situations of the frame.
Źródło:
Journal of KONES; 2018, 25, 1; 289-294
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The assessment of the relationships between body posture indices and the Y-Balance Test results in the adolescents
Autorzy:
Walaszek, R.
Chwała, W.
Walaszek, K.
Burdacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/306499.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
postawa ciała
metoda fotogrametryczna
stabilność postawy
test
równowaga
body posture
photogrammetric method
postural stability
Y-Balance Test
Opis:
The purpose of this work was to assess the differences of the values of body posture indices, measured with the Moire’s method, between girls and boys aged 13 and the relationships of these values with the results of the Y-Balance Test. Methods: The study involved a group of healthy volunteers attending junior high schools in Cracow. The group consisted of 20 girls and 35 boys. Basic somatic parameters were measured within this work: body height and weight. Body posture was assessed according to the general methodology of the Moire’s technique and 14 body posture indices were obtained as a result: 6 in the sagittal plane, 1 in the axial plane and 7 in the coronal plane. Postural stability was assessed with the Y-Balance Test (YBT). Results: The studied girls and boys had practically the same body posture – statistical differences were found only in 3 out of 14 assessed indices measured with the Moire’s technique. Scoliosis was found in as many as 51% of the subjects, however, mean values of deviations from the C7-S1 line were not large. Conclusions: In the group of girls, the set of blades (below – above) was statistically significantly correlated with the global YBT result for the right inferior extremity, and in the group of boys – the set of the waist triangles (below – above) was statistically significantly correlated with the global YBT results for the right and left inferior extremities.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 2; 149-157
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 39

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