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Tytuł:
Research on the side deflection of the saw band of a joinery band saw influenced by the selected technical and technological factors
Autorzy:
Krilek, Jozef
Kuvik, Tomáš
Kováč, Ján
Melicherčík, Ján
Powiązania:
https://bibliotekanauki.pl/articles/409900.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
band saw
saw band
stability
side deflection
Opis:
The paper focuses on measuring and evaluating the impact of selected technical and technological factors - the height of adjustable guides and stretching force - on the side deflection of the saw band of a joinery band saw. There is a detailed description of the ways the side deflection can be measured. In order to find out the intensity of the stretching force was used portable tension meter SANDVIK 5000, enabling to check the tensile stress in the saw blades of a gang saw or in the saw bands of a band saw. The actual experiment was conducted on a joinery band saw, at the cutting rate vc = 15 m·s-1. The results of the measurements confirmed the theoretical assumption of the impact of the selected technical and technological factors on the stability of the saw band, where the side deflection decreases with increasing stretching force and increases with increasing height of the guides. The stability of the saw band affects the quality of the surface to be treated, thus saving the cost of machining the workpiece and making work productivity more efficient.
Źródło:
Management Systems in Production Engineering; 2020, 3 (28); 148-153
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozmyta metoda SAW z wagami uzyskanymi za pomocą rozmytej entropii
The Fuzzy SAW Method and Weights Determined Based on Fuzzy Entropy
Autorzy:
Kacprzak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/964983.pdf
Data publikacji:
2018
Wydawca:
Główny Urząd Statystyczny
Tematy:
iczby rozmyte
metoda SAW
entropia
wagi obiektywne
zmienne lingwistyczne
fuzzy numbers
entropy
objective weights
linguistic variables
SAW method
Opis:
W pracy przedstawiono nowe podejście do rozmytej metody SAW w której wykorzystano rozmytą entropię. Umożliwia ono wskazanie wariantu końcowego za pomocą metody FSAW, gdy decydenci wykorzystują liczby rozmyte lub zmienne lingwistyczne. Ponadto prezentowana metoda pozwala uniknąć subiektywizmu decydenta i nieprecyzyjność spowodowanej przez niepełną wiedzę, osądy, opinie i preferencje decydentów
The paper presents a new approach to the fuzzy SAW method, which uses fuzzy entropy. It allows to identify the best alternative by the application FSAW method if decision makers use fuzzy numbers or linguistic variables. Moreover, the presented method allows to avoid subjectivity and imprecision caused by incomplete knowledge, judgments, opinions and preferences of decision makers.
Źródło:
Przegląd Statystyczny; 2018, 65, 1; 25-40
0033-2372
Pojawia się w:
Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Sensitivity of SAW Structure to the Effect of Toxic Gases
Autorzy:
Hejczyk, T.
Pustelny, T.
Wszołek, B.
Jakubik, W.
Maciak, E.
Powiązania:
https://bibliotekanauki.pl/articles/177695.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface acoustics wave SAW
SAW
Ingebrigtsen’s formula
gas diffusion equations
gaseous acoustic sensors
numerical analyses of SAW structures
Opis:
The paper presents the results of numerical analysis of the SAW gas sensor in the steady and non-steady states. The effect of SAW velocity changes vs surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. The Knudsen’s model of gas diffusion was used. Numerical results for the effect of gas CH4 on layers: WO3, TiO2, NiO, SnO2 in the steady state and CH4 in the non-steady state in recovery step in the WO3 sensing layer have been shown. The main aim of the investigation was to study thin film interaction with target gases in the SAW sensor configuration based on simple reaction-diffusion equation. The results of the numerical analysis allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness, operating temperature, and layer type. The numerical results basing on the code elaborated numerical system (written in Python language), were analysed. The theoretical results were verified and confirmed experimentally.
Źródło:
Archives of Acoustics; 2016, 41, 4; 747-755
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda SAW z przedziałowymi danymi i wagami uzyskanymi za pomocą przedziałowej entropii Shannona
The SAW method with interval data and the weights obtained using the interval Shannon’s entropy
Autorzy:
Kacprzak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/591032.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Entropia Shannona
Liczby przedziałowe
Metoda SAW
Wagi obiektywne
Interval numbers
Objective weights
SAW method
Shannon entropy
Opis:
Celem artykułu jest rozszerzenie metody SAW na problemy podejmowania decyzji z danymi przedziałowymi. Pozwala to na modelowanie problemów rzeczywistych, w których nie można dokładnie zmierzyć danych. Zaproponowana metoda wykorzystuje entropię Shannona, która jest jedną z metod wyznaczania obiektywnych wag kryteriów. Pozwala to uniknąć subiektywizmu i nieprecyzyjności spowodowanej niekompletną wiedzą, osądami, opiniami i preferencjami decydentów.
The aim of the paper is to extend the SAW method for decision-making problems with interval data. This allows modeling real life problems in which data cannot be measured precisely. Moreover, proposed method uses Shannon’s entropy which is one of the methods for finding objective weights of criteria. It allows to avoid subjectivity and imprecision caused by incomplete knowledge, judgments, opinions and preferences of decision makers.
Źródło:
Studia Ekonomiczne; 2018, 348; 144-155
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PODEJMOWANIE DECYZJI Z WYKORZYSTANIEM ROZMYTEJ METODY SAW I TRANSFORMATY MELLINA
DECISION-MAKING BASED ON FUZZY SAW METHOD AND MELLIN TRANSFORM
Autorzy:
Kacprzak, Dariusz
Rudnik, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/453383.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
podejmowanie decyzji
metoda wielokryterialna
liczby rozmyte
rozmyta metoda SAW
transformata Mellina
Fuzzy Multi Attribute Decision Making FMADM
fuzzy numbers
fuzzy SAW method
Mellin transform
Opis:
W pracy przedstawiono zastosowanie transformaty Mellina do porównania liczb rozmytych będących wynikiem działania metody FSAW. Transformata Mellina wykorzystuje funkcję gęstości prawdopodobieństwa związanej z liczbą rozmytą, po uwzględnieniu transformacji proporcjonalnej. Pozwala to na porządkowanie liniowe liczb rozmytych w oparciu o miary statystyczne (średnią i wariancję). W szczególności przedstawiono zależności matematyczne dla trójkątnych liczb rozmytych. Metodę zilustrowano na przykładzie wieloatrybutowego podejmowania decyzji.
The paper presents the use of Mellin transform to compare fuzzy numbers in the FSAW method. The Mellin transform uses the probability density function (PDF) associated with the fuzzy number. The PDF is calculated with the proportional transformation. The proposed method allows to rank fuzzy numbers based on statistical measures (the mean and the variance). In particular, the mathematical relations for the triangular fuzzy numbers are presented. A numerical example of the fuzzy multi-criteria decision-making is illustrated.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 3; 141-150
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of chain saw pitch on vibration level on the internal combustion chain saw handles during cross cutting of wood
Wpływ podziałki piły łańcuchowej na poziom drgań uchwytów pilarki spalinowej podczas przerzynki drewna
Autorzy:
Skarzynski, J.
Pietrkiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/56211.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
chain saw
vibration level
internal combustion chain saw
handle
cross-cutting
wood cutting
Opis:
Effect of chain saw pitch on vibration level on the internal combustion chain saw handles during cross cutting of wood. Results of investigations on the efect of chain saw pitch on the vibration level recorded on the internal combustion chain saw handles are presented. The investigations can contribute to learning of factors that intensify vibrations existing during cross cutting of wood with the use of chain saws of different pitch values; they can be also a source of practical instructions for the sawmen-operators of internal combustion chain saws to reduce the hazard of mechanical vibrations. Basing on the results of investigations one can find that the chain saw pitch affects vibration level on the machine handles; it increases along with an increase in the pitch.
Wpływ podziałki piły łańcuchowej na poziom drgań uchwytów pilarki spalinowej podczas przerzynki drewna. W artykule przedstawiono wyniki badań nad wpływem wielkości podziałki piły łańcuchowej na poziom drgań rejestrowanych na uchwytach pilarki spalinowej. Przedstawione badania mogą przyczynić się do poznania czynników intensyfikujących drgania występujące podczas przerzynki drewna z zastosowaniem pił łańcuchowych o różnych wielkościach podziałek oraz mogą być źródłem praktycznych wskazówek dla drwali operatorów pilarek spalinowych w kwestii zmniejszenia ich narażenia na drgania mechaniczne. Na podstawie wyników badań można stwierdzić, że wielkość podziałki piły łańcuchowej wpływa na poziom drgań na uchwytach pilarki. Wraz ze wzrostem podziałki piły łańcuchowej, drgania emitowane przez pilarkę zwiększają się.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture; 2013, 61 Agric.Forest Eng.
0208-5712
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy losses in big band saw machines – analysis and optimization
Autorzy:
Marinov, Boycho
Powiązania:
https://bibliotekanauki.pl/articles/949943.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
band saw machine
kinetic energy losses
optimization procedure
optimization solution
Opis:
In this paper, the energy losses in big band saw machines are investigated. These losses are caused by the geometric and angular inaccuracies with which the leading wheels are made. Expressions for calculating the kinetic energy of the mechanical system in the ideal and the real cases are obtained. For this purpose, expressions for calculating the velocities of the centers of the masses in two mutually perpendicular planes are obtained. A dependence for calculation of the kinetic energy losses of the mechanical system in final form is received. Optimization procedure is used to determine the values of the parameters at which these losses have minimum values. The proposed study can be used to minimize energy losses in other classes of woodworking machines.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 3; 335-351
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring the dynamic twisting behaviour of saw blades in the kerf during the sawing process
Autorzy:
Albrecht, D.
Stehle, T.
Powiązania:
https://bibliotekanauki.pl/articles/100185.pdf
Data publikacji:
2016
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
band saw
cutting
vibration
measurement
Opis:
Vibrations may occur in all kinds of production processes. Particularly the kinematics of band saws with their thin and unstable structure of the saw blade causes high vibrations, which generate, on the one hand, a high acoustic level. On the other hand, the impact can be seen as grooves on the surface of the workpiece. To optimize the sawing process, the vibration behaviour of the saw blades is investigated by experiment on a test band saw with a contactless measuring system during the sawing process of steel. The focus here is on the twisting of the saw blade in the kerf. The sawing parameters of cutting speed and feed rate are varied here in a wide range to examine the stability of the process and the occurring displacement of the saw blade. The results of this investigation indicate that the saw blade in the kerf shows a characteristic behaviour, which is subject to the cutting parameters. It is obvious that the performance of the process depends not only on the cutting process but also on the tensile state of the saw blade affected by the design of the saw frame, the saw blade guides and the saw blade tension. The results obtained are able to support future developments and identify an optimization potential for the sawing process.
Źródło:
Journal of Machine Engineering; 2016, 16, 3; 75-87
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machine vision detection of the circular saw vibrations
Autorzy:
Sandak, J.
Orlowski, K. A.
Powiązania:
https://bibliotekanauki.pl/articles/100155.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
circular saw blade
vibrations
machine vision system
supervising
critical rotational speed
Opis:
Dynamical properties of rotating circular saw blades are crucial for both production quality and personnel safety. This paper presents a novel method for monitoring circular saw vibrations and deviations. A machine vision system uses a camera and a laser line projected on the saw’s surface to estimate vibration range. Changes of the dynamic behaviour of the saw were measured as a function of the rotational speed. The critical rotational speed of the circular saw blade as well as the optimal rotational speed of the saw were detected.
Źródło:
Journal of Machine Engineering; 2018, 18, 3; 67-77
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stanowisko do badania sensorów z akustyczną falą powierzchniową
A system for SAW sensors research
Autorzy:
Grabka, M.
Jasek, K.
Pasternak, M.
Miluski, W.
Powiązania:
https://bibliotekanauki.pl/articles/271324.pdf
Data publikacji:
2015
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
sensory z akustyczną falą powierzchniową (AFP)
akustoelektroniczne układy pomiarowe
surface acoustic wave (SAW) sensors
SAW sensors measurement circuits
Opis:
Układy elektroniczne współpracujące z sensorami z AFP mają najczęściej postać oscylatora, którego zmiany częstotliwości rezonansowej odzwierciedlają zmiany prędkości propagacji AFP. Pomiar samych zmian częstotliwości rezonansowej utrudnia lub nawet uniemożliwia wydobycie istotnych informacji o mechanizmach oddziaływania warstwy sensorowej z otoczeniem. W pracy przedstawiono zaprojektowane i wykonane w Wojskowej Akademii Technicznej (WAT) stanowisko do badania sensorów z AFP, w którym klasyczny układ oscylatora został zastąpiony systemem liniowym z wymuszeniem zewnętrznym, generowanym przez stabilny generator sygnału ze schodkową modulacją częstotliwości. Obok pomiaru częstotliwości rezonansowej, układ umożliwia pomiary tłumienia i fazy AFP, co pozwala na pełniejsze wykorzystanie możliwości detekcyjnych sensorów. W pracy przedstawiono zasadę działania, opis konstrukcji stanowiska z prototypową matrycą czujników z AFP oraz opis oprogramowania sterującego.
An electronic circuits collaborating with SAW sensors have usually a self-oscillator architecture where resonant frequency changes reflect the SAW velocity changes. Unfortunately the measurements including the resonant frequency only make the substantial information concerning interaction mechanism between sensor layer and ambient gases hard or even impossible to extract. In the paper a prototype laboratory test stand for SAW sensors designed and manufactured in Military University of Technology is described. In the system typical self-oscillating circuits with SAW device working inside positive feedback loop was replaced by the linear system with stepped frequency source. The system allows the measurements of signal amplitude and phase shift besides frequency changes. It gives a possibility of more complete insight into the SAW-ambient gas interaction mechanism. In the paper operating principle of the system as well as control software for test stand with SAW matrix are described.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2015, 20, 4; 251-258
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Investigation into Parameters Influencing Roll Tensioning of Circular Saw Blades
Autorzy:
Heisel, U.
Stehle, T.
Ghassemi, H.
Powiązania:
https://bibliotekanauki.pl/articles/99653.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
circular saw
wood machining
cutting tool
metal forming
Opis:
Circular saw blades are rolled in the shape of a ring by special roll tensioning machines to improve the static and dynamic behaviour of steel saw blades. Plastic deformation and strain hardening in the roller track area cause residual stresses in the circular saw blade, which influence the static stiffness and the natural frequencies of the circular saw blade. Roll tensioning is one of the important parts when producing circular saws, especially in the production of thin circular saw blades. Although the influence of the roll tensioning process on the static and dynamic properties is well-known, it is interesting to further investigate the parameters influencing the roll tensioning process. This paper presents the influence of various parameters on the roll tensioning process, such as material properties, rolling force, contact condition between roller wheels and circular saw blade. These investigations help to find the optimisation ability of this process and to gain a better understanding of the relationships between roll tensioning processes and improved static and dynamic properties of thin saw blades.
Źródło:
Journal of Machine Engineering; 2015, 15, 1; 98-111
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emigration activity of the saw-toothed grain beetle Oryzaephilus surinamensis L. (Coleoptera: Silvanidae) in various environmental temperatures
Autorzy:
Klys, M.
Powiązania:
https://bibliotekanauki.pl/articles/65526.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
emigration activity
saw-toothed grain beetle
Oryzaephilus surinamensis
Coleoptera
Silvanidae
environment temperature
sawtoothed grain beetle zob.saw-toothed grain beetle
population dynamics
sex ratio
Opis:
The study pertained to the saw-toothed grain beetle Oryzaephilus surinamensis L., a dangerous pest of stored food products. The studies were carried out in the laboratory. Thermostats were set at a temperature of 31°C; an optimum temperature for this insect species, and in temperatures lowered to 28 and 22°C. The relative air humidity was kept at 60 ±5% relative humidity (RH). The main topic of the study was to examine the effect of lower temperatures in the environment, on the emigration activity of O. surinamensis. In these conditions, the population dynamics and the sex structure in O. surinamensis populations were also studied. The saw-toothed grain beetle was found to display very high emigration activity at 31 and 28°C. Lowering the temperature to 22°C caused a decrease in emigration activity and total inhibition of emigration activity until the 120th day of the experiment. A higher emigration levels among females rather than males, was also observed.
Źródło:
Journal of Plant Protection Research; 2012, 52, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of airside aerodrome infrastructure by SAW method with weights from Shannons interval entropy
Autorzy:
Żak, Jolanta
Gołda, Paweł
Cur, Krzysztof
Zawisza, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2067399.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
entropy
aerodrome infrastructure
SAW
Opis:
Multi-criteria decision support (MCDM) methods are widely used in many areas of science. This applies to economic, social and technical sciences. Implementing activities at the strategic, tactical or operational level requires appropriate tools to support decision-makers. The use of these tools requires the preparation of a decision model along with the formalization of the goal and the acquisition and preparation of data to make the decision accurate. Due to the wide application of MCDM in engineering practice, the article presents their application in air transport. It is an area that is constantly evolving, and all decisions at the strategic level have long-term effects and must be adequately justified. In the paper a compartmental extension of the classical SAW method with weights obtained using the compartmental Shannon entropy was proposed. This paper presents issues concerning the choice of airport layout and describes the problems that occur in determining the cost and capacity of airports. This paper reviews the literature on airport capacity and operations and airside air transport processes and the application of various multi-criteria decision support methods to airport problems. The main part of the article contains an optimization mathematical model aimed at determining the parameters of the elements comprising the airport, on the basis of which a simulation model was developed and a modified method of multi-criteria evaluation of SAW taking into account the interval numbers was presented, in which the set of weights was estimated by the Shannon entropy method. In the application part for 3 variants of the airport arrangement, the parameters were determined in the form of interval numbers and then evaluated using the presented method. The presented numerical example shows that the proposed method is an excellent tool to assist in solving complex decision problems where the data are imprecise and represented by interval numbers.
Źródło:
Archives of Transport; 2021, 60, 4; 171--185
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Modelling Studies of 400 MHz ST-X Quartz SAW Delay Lines for Potential Gas Sensing Applications
Autorzy:
Thirumal, V.
Raju, B.
Gandhi, P.
Pandya, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/177740.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface acoustic wave
SAW delay line
impulse response model
equivalent circuit model
coupling-of-modes
COM model
SAW sensors
Opis:
Surface Acoustic Wave (SAW) devices like delay lines, filters, resonators etc., are nowadays extensively used as principal solid state components in many electronic applications and chemical vapour sensors. To bring out the best from these SAW devices, computational design and modelling are resorted too. The present paper proposes the modelling of 400 MHz ST-X Quartz based SAW delay line, by three models namely, Impulse Response Model (IRM), Crossed-field Equivalent Circuit Model (ECM) and Coupling-of-Modes (COM) model. MATLAB® is employed as a computational tool to model the experimental output of the SAW device. A comparative discussion of the modelled device results is also provided.
Źródło:
Archives of Acoustics; 2018, 43, 2; 153-161
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of saw chain type and wood species on the kickback angle of a chainsaw
Autorzy:
Kaliniewicz, Z.
Maleszewski, Ł.
Krzysiak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/297817.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
chainsaw
kickback
saw chain
wood
correlation
Opis:
Wood processing operations, in particular debarking, can pose a significant hazard for the chainsaw operator when performed without due caution. The most common hazards with potentially fatal consequences include kickback which occurs when the chainsaw’s guide bar is violently thrown backwards towards the operator. The aim of this study was to determine the influence of wood species and different saw chain brands on the kickback angle of a chainsaw. The kickback angle of a combustion chainsaw was analyzed in a self-designed test stand with the use of a digital level gauge accurate to 0.1°. Four differently priced saw chain brands, including two standard chains and two chains with anti-kickback features, were evaluated. Kickback was analyzed on five wood species (pine, spruce, birch, alder and oak) at three engine speeds (50%, 75% and 100% of maximum rotational speed). Kickback was significantly determined by wood species and saw chain type, and it was less influenced by the rotational speed of the chainsaw engine. The average kickback angle was largest in alder and smallest in spruce. The analyzed parameter was not always reduced by saw chains with anti-kickback features. In some cases, low-priced saw chains with anti-kickback features offer less protection than more expensive standard chains. Chainsaw buyers should decide whether it is worthwhile to compromise on safety in exchange for a lower price.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(4); 323-334
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation and Optimization of Saw Blade Production in Plant Simulation
Autorzy:
Malega, Peter
Daneshjo, Naqib
Rudy, Vladimír
Rehák, Róbert
Powiązania:
https://bibliotekanauki.pl/articles/2201772.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
saw blade
Plant Simulation
optimization
production process
simulation model
Opis:
This paper is oriented on very important topics, which nowadays simulation and optimization surely are. First part of this paper is oriented on simulation software Plant Simulation, because this software is one of the best software on the market. Second section deals in detail with the procedure of saw blades production. Third section presents creation of simulation model for selected production process, which is production of saw blades. Final fourth section is about proposals for improvement of saw blade production.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 67--77
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of saw method to support the decisions concerning start-up financing
Autorzy:
Konopka, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2127670.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
economic activity
loans
credit risk modeling
multiple criteria decision methods (MCDM)
SAW
Opis:
The aim of the paper was to present the problem of risk assessment of financing start-ups of individual economic activities as the problem of multi-criteria decision making. The detailed goal of the study was to build a decision model and its empirical verification. Research methodology – The SAW method - was used to build the model based on the concept of the aggregation of the decision-maker's preferences. In the process of building the model, the correspondence analysis was also used. Result – The result of the research is the decision model, the usability of which has been subjected to empirical verification. Originality/value – The model approach proposed in the paper is an original approach for two reasons: Firstly, the correspondence analysis was used in the stage of assigning ranks to verbal or interval variables; Secondly, the use of Cramer's V coefficient to calculate the weightings of criteria and decision sub-criteria was proposed, hence the resulting algorithm of the model should be recognized as the added value of the conducted research.
Źródło:
Optimum. Economic Studies; 2018, 4(94); 242-255
1506-7637
Pojawia się w:
Optimum. Economic Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of pure Love mode SAW sensor with graphene interdigital transducer for biosensing applications
Autorzy:
Chen, Chen
Wang, Xinyu
Wang, Yuting
Powiązania:
https://bibliotekanauki.pl/articles/2233256.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
SAW biosensor
Love mode
graphene
mass sensitivity
Opis:
The characteristics of Love wave biosensors are systematically investigated. The results show that sensors with combination of a ZnO guiding layer and 90ST or 90AT Quartz substrates exhibit purer Love modes than those with the SiO2 guiding layer. The corresponding maxi- mum sensitivities are −10.9069 and −11.641m2/kg, respectively, which are nearly two times higher than those of SiO2 layer. The ZnO/90ST Quartz Love wave sensor exhibits the largest K2 of 0.3022 and achieves 0 ppm/oC of TCF at hZnO/λ = 0.0216. The sensor employing the Graphene IDT further improves the sensitivity by nearly one order of magnitude.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 551--559
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant vibrations of the moving band saw blade with variable tension
Autorzy:
Dzyuba, L.
Khytriak, O.
Menshykova, O.
Rebeznyuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/297975.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
transverse vibrations
resonance
band saw
tension force
speed
frequency response
Opis:
Resonant transverse bending vibrations of the band saw blade have been investigated taking into consideration variable in the time tension force of the blade and the external periodic perturbation. Amplitude of resonant vibrations of the band saw blade piece has been determined by the Bubnov-Galerkin method and basing on the idea of perturbation theory.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(1); 49-59
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania eksperymentalne sił działających na zęby piły taśmowej w czasie cięcia różnych gatunków drewna
Experimental research of cutting forces acting on a band saw teeth during cutting various species of wood
Autorzy:
Król, R.
Taraś, A.
Powiązania:
https://bibliotekanauki.pl/articles/310873.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
piła taśmowa
pilarka taśmowa
obróbka drewna
band saw
band saw machine
wood processing
Opis:
W artykule przedstawione zostały wyniki pomiarów sił, które działają na zęby piły taśmowej podczas cięcia różnych gatunków drewna występujących w Polsce. Ostatnia zaawansowana praca, poświęcona cięciu polskich gatunków drewna na piłach taśmowych opublikowana została przez T. Orlicza w latach sześćdziesiątych ubiegłego stulecia. Obecnie brak jest publikacji zawierających podobne wyniki, zmierzone przy użyciu nowoczesnych metod. W artykule autor przedstawił wyniki pomiarów sił skrawania uzyskane przy użyciu oryginalnego urządzenia składającego się z czujników foliowych, elektronicznego układu Arduino oraz laptopa. Informacje o siłach podczas cięcia drewna są potrzebne przy projektowaniu pił taśmowych i pilarek taśmowych. Znany jest przypadek firmy produkującej piły taśmowe, która zdecydowała się na eksport swoich produktów do Chin i zanotowała straty, ponieważ chińskie drewno odznacza się innymi właściwościami fizycznymi niż gatunki krajowe.
In this paper the results of forces measurement, which act on the band saw teeth during cutting various species of Polish wood was discussed. Since 1960, when T. Orlicz published results of cutting forces measurement, there haven’t been published any comprehensive work which present the similar data measured with modern equipment for Polish species of wood. In this paper, author shows the results which was measured by the original device consisted of film sensors, Arduino electronic board programmed by the author for the film sensor signal sampling and notebook. Knowledge about forces, which act on the band saw teeth during cutting chosen species of wood is necessary in the design of band saw blades and band saw machines. It was known case, when Polish company took in the export of band saws for China and recorded a loss, because the Chinese wood is characterized by different physical properties than domestic species.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 12; 1092-1096
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixed Pseudo-orthogonal Frequency Coding for SAW RFID Tags
Autorzy:
Xu, M.
Xiao, X.
Yuan, Q.
Zong, Y.
Powiązania:
https://bibliotekanauki.pl/articles/176715.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SAW RFID tag
OFC
POFC
Mixed-POFC
mixed pseudo-orthogonal frequency coding
COMSOL
Opis:
A mixed pseudo-orthogonal frequency coding (Mixed-POFC) structure is proposed as a new spreadspectrum technique in this paper, which employs frequency and time diversity to enhance tag properties and balances the spectrum utilization and code diversity. The coding method of SAW RFID tags in this paper uses Mixed-POFC with multi-track chip arrangements. The cross-correlation and auto correlation of Mixed-POFC and POFC are calculated to demonstrate the reduced overlap between the adjacent center frequencies with the Mixed-POFC method. The center frequency of the IDT and Bragg reflectors is calculated by a coupling of modes (COM) module. The combination of the calculation results of the Bragg reflectors shows that compared with a 7-chip POFC, the coding number of a 7-chip Mixed-POFC is increased from 120 to 144 with the same fractional bandwidth of 12%. To demonstrate the validity of Mixed-POFC, finite element analysis (FEA) technology is used to analyze the frequency characteristics of Mixed-POFC chips. The maximum error between designed frequencies and simulation frequencies is only 1.7%, which verifies that the Mixed-POFC method is feasible.
Źródło:
Archives of Acoustics; 2018, 43, 4; 681-687
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GIS based modeling of GWQ assessment at Al-Shekhan area using AHP and SAW techniques
Autorzy:
Ahmed, Mohammed F.
Faisal, Raid M.
Powiązania:
https://bibliotekanauki.pl/articles/118718.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
AHP
SAW
GWQ
Al-Shekhan area
GIS
based model
Opis:
There is a continuous need to assess Groundwater Quality (GWQ) for human beneficial uses especially in areas suffering a shortage of nearby surface water. This study aims to assess GWQ of 56 wells located at Al-Shekhan area for drinking, irrigation, and livestock purposes. Analytical Hierarchical Process (AHP) technique is used to extract weights of parameters that are needed in the calculation of Simple Additive Weighting (SAW) technique. Maps are created using Geographical Information Systems (GIS), and these maps shows the classes of suitable areas for each purpose depending upon the calculated indices which are extracted from SAW technique. The results show that the final map classifies the suitable parts according to the drinking, irrigation and livestock purposes, and it shows that the north eastern part of the studied area is suitable for irrigation and livestock only. A model of GIS and AHP is built to assess the suitability of GWQ in Al-Shekhan area, and can be a raw model to be applied to assess GWQ in any other area after inserting the values of their parameters.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2020, 29, 2; 172-183
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane własności i odmiany procedury SAW w kontekście wspomagania negocjacji
Some Properties and Types of the SAW Procedure from the Perspective of Supporting Negotiation
Autorzy:
Roszkowska, Ewa
Brzostowski, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/589271.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Negocjacje
Negotiations
Opis:
This work provides a survey of the properties of SAW method (Simple Additive Weighting) which is one of the simplest and mostly used multiple criteria techniques. The work is presented by focusing mostly on the application of SAW in the support of bilateral negotiations. The strengths and limitations of the proposed approach are discussed and the suggestions of modifications of the classical algorithm are presented from the viewpoint of applications in the negotiation process. The function assigning a score to the negotiation packages, determined by the use of modified SAW procedure is a useful tool facilitating linear ordering of negotiation packages, the estimation of potential concessions, the implementation of a negotiation strategy and the analysis of negotiation compromise
Źródło:
Studia Ekonomiczne; 2014, 178; 107-126
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SAW sensor for detection of hydrocarbons. Numerical analysis and experimental results
Autorzy:
Hejczyk, T.
Urbańczyk, M.
Wituła, R.
Maciak, E.
Powiązania:
https://bibliotekanauki.pl/articles/201623.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SAW
gas sensor
piezoelectric substrate
Ingebrigtsen's formula
impedance transformation law
numerical modeling
Opis:
The paper presents the results of numerical analyses of the SAW gas sensor in the steady and non-steady state. The effect of SAW velocity changes vs. the surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. Knudsen's model of gas diffusion was used. Numerical results for the gases CH4, C2H4, C3H8, C6H6 in the steady state and CH4 in the non-steady state in the WO3 sensing layer have been shown. The results of numerical analyzes allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness and operating temperature. Some numerical results were verified in experimental studies concerning methane.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 589-595
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of technological usefulness of panel production line in shipbuilding process
Autorzy:
Urbański, T.
Graczyk, T.
Taraska, M.
Iwańkowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/259325.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
panel production line
welding technology
SAW
SAW-tandem
GMAW-tandem
FCAW
ship hull
Opis:
This paper presents assessment of technological usefulness of panel production line in prefabrication process of large ship hull sections, in which special attention is paid to producibility of welding operations. Basing on the assessment these authors worked out hierarchy of analyzed sequences of welding technological processes as well as production line stands used for the processes. The assessment was performed on the basis of analysis of a concept of panel production line based on real production lines functioning in shipbuilding industry, as well as technical documentation of typical hull sections of a multi-purpose ferry. The presented analysis took into account impact of technological - constructional parameters onto producibility of welding process of prefabricated sections. Among these parameters the following were numbered: mass of the sections and number of their elements, total length of welds, labour consumption, material consumption as well as linear heat input in welding operations. On the basis of the achieved results, places which worsen effectiveness of production line operation were identified, as a result it was possible to formulate proposals for modernization of flow prefabrication line for hull sections.
Źródło:
Polish Maritime Research; 2018, S 1; 134-144
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 147

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