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Wyświetlanie 1-15 z 23
Tytuł:
The acoustic emission (AE) controlling method of the electric sheet blanking process – a comparative study of selected data mining methods
Autorzy:
Kochański, Andrzej
Czyżewski, Piotr
Moszczyński, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/29520061.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
acoustic emission
data acquisition
data preparation method
visualization method
process duration
process speed
punching
manufacturing
Andrews curves
PCA
LDA
tSNE
Sammon Mapping
emisja akustyczna
pozyskiwanie danych
metoda wizualizacji
czas trwania procesu
szybkość procesu
uderzenie
produkcja
krzywe Andrewsa
mapowanie Sammona
Opis:
The article presents an experimental stand to assess the state of punch in the process of sheet blanking. Blanking trials were carried out on an eccentric press. During all the trials, there were recorded signals of acoustic emission (AE) that accompanied the process of blanking. For the recorded AE signals, the methodology of data preparation and analysis was presented. On that basis, the results of the assessment of the state of the punch were presented, and they employed five methods of visualization: Andrews curves, Principal Components Analysis, Linear Discriminant Analysis, a modified method of Stochastic Neighbor Embedding and Sammon Mapping. The aim of the work was to assess the possibility of using visualization methods to predict the condition of the tool on the basis of acoustic emission signals in processes carried out in extremely short times.
Źródło:
Computer Methods in Materials Science; 2022, 22, 4; 189-200
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intelligent control system for HSM
Autorzy:
Vallejo, A.
Morales-Menendez, R.
Elizalde-Siller, H.
Powiązania:
https://bibliotekanauki.pl/articles/384709.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
Markov decision process
optimization
high-speed machining
milling process
neural network
Opis:
Next-generation of High-Speed Machining (HSM) systems demand advanced features such as intelligent control under uncertainty. This requires, in turn, an efficient administration and optimization of all system's resources towards a previously identified objective. This work presents an optimization system based on Markov Decision Process (MDP), where an intelligent control guides the actions of the operator in peripheral milling processes. Early results suggest that MDP framework can cope with this application, yielding several benefits, which are discussed in detail. Future work will address the full integration of the developed optimization scheme within a commercial machining center.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 3; 54-63
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the influence of mold rotational speed on the cast wall thickness in the rotational molding process
Autorzy:
Jachowicz, T.
Sikora, J.W.
Powiązania:
https://bibliotekanauki.pl/articles/103027.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
rotational molding process
mold rotational speed
polymer cast
Opis:
This paper presents the rotational molding process. The general principles of this polymer processing technology have been described. The main applications have been introduced and leading advantages and typical disadvantages of rotational molding process have been discussed. Based on the conducted experimental tests, the influ¬ence of changing one selected technological parameter, which characterized rotational molding process, on selected geometrical features of the polymer cast has been deter¬mined. Rotational mold’s speed around axes was changed and a thickness of cast walls has been measured. Laboratory test stand, processing properties of polymer, also test program and experimental test methodology have been described.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 19; 79-87
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Vibration Behaviors of Turning Machining with the Constant Surface Speed Effect
Autorzy:
Royandi, Muhamad Aditya
Effendi, Iman Apriana
Ibrahim, Bustami
Hung, Jui Pin
Powiązania:
https://bibliotekanauki.pl/articles/2123279.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
constant surface speed
cutting force
machining vibration
turning process
Opis:
Turning machining is a complex process in which many variables can influence the desired results. Among those variables, cutting tool vibration and cutting force greatly affect the precision of the workpiece and the tool life. While the tool vibration and cutting force in feeding are primarily determined by cutting speed, feed rate, and depth of cut as well as the dynamic characteristics of the machining system. This paper presents an analytical modeling approach to investigate the effects of machining conditions based on the governing equation of the machining system. The machining behaviors under different conditions were simulated by Simulink block diagram. Basically, the cutting speed is considered the parameter dominating the vibration behavior and hence is served as the primary input for the simulation. The effectiveness of constant surface speed (CSS mode) or function G96 in the turning process was further examined through comparisons of the variations of vibration and cutting force generated in feeding with different conditions.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 134--145
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations into the process of rotary mowing of selected energy crops
Badanie procesu cięcia rotacyjnego wybranych roślin energetycznych
Autorzy:
Rode, H.
Witkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/792028.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
Virginia fanpetal
Sida hermaphrodita
Miscanthus x giganteus
cutting process
energy crop
moisture
linear speed
rotational speed
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 3
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the Method for Determining the Interaction of Cotton With the Working Bodies of Cotton Gins
Autorzy:
Sailov, Rahib Aqaqul
Powiązania:
https://bibliotekanauki.pl/articles/2200751.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
fibre damage
cottonseed
sound speed
cleaning process
cotton raw material
Opis:
A theoretical regularity of the general behaviour of raw cotton as a porous medium in the technological processes of its mechanical processing has been substantiated for the first time. The speed of sound in a porous cotton medium has now been determined. The effect of additional force stresses inside the cotton medium caused by the filtration of the air component from cotton raw materials during the introduction of the working body, has been disclosed. A generalized equation that describes the force stress in a cotton medium when exposed to a variety of shapes of working bodies of cotton machines has been worked out. A method for calculating the damage to seeds and cotton fibers caused by their interactions with the working bodies of processing machines has been proposed. The resultant theory that describes the stress state of cotton raw materials during processing allows us to use it practically to solve all important issues pertaining to the damage of fiber and cotton seeds that occur by using technological solutions in primary processing of cotton operations.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 6 (151); 74--79
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The crisis and its effect on disparities in the European Union
Autorzy:
Lesiewicz, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/647852.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
crisis
differentiated integration
the multi-speed European Union
flexibility of the integration process
Opis:
This text considers the crisis in the context of its impact on development and disparities within structure of the European Union across various levels of its functions. The main objective of this work is to provide answers to the following questions: how many times has the European Union faced the crisis in the past; was the crisis an element that eventually strengthened or weakened the EU integration process; what decisions were made to fight the crisis; and to what extent was the crisis an element that led to disparities within the European Union? One of the goals is also to define the notion of crisis. The primary thesis of this text is a statement that crises, which affected the EU, contributed to differentiations of its policies. This is partially contrary to the concept of the European integration, developed in the 1950s, which assumed that the EU member states need to move forward at the same speed and as part of equal participation in the integration projects. Crises, however, contribute to disparities in the European integration.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio K – Politologia; 2015, 22, 1
1428-9512
2300-7567
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio K – Politologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Pore Characteristics of a SUS316L Gas Filter Fabricated by Wet Powder Spraying
Autorzy:
Lee, Min-Jeong
Yi, Yu-Jeong
Kim, Hyeon-Ju
Park, Manho
Lee, Jungwoo
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/2174584.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wet powder spraying process
double pore structures
pore properties
rotation speed
coating time
Opis:
In this study, a flake-shaped metal powder was coated on a tube shaped pre-sintered 316L stainless steel support using a wet powder spraying process to fabricate a double pore structure, and the pore characteristics were analyzed according to coating time and tube rotation speed. The thickness of the coated layer was checked via optical microscopy, and porosity was measured using image analysis software. Air permeability was measured using a capillary flow porometer. As a result of the experiment, the optimal rotation speed of the support tube was established as 200 rpm. When the rotation speed was fixed, the coating thickness and the coating amount of the double pore structure increased as the coating time increased. The porosity of the double pore structure was increased due to the irregular arrangement of the flake-shaped powder. The air permeability of the double pore structure decreased with increasing fine pore layer thickness.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1547--1550
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on disc cutting unit for cutting energy plants
Badania tarczowego zespolu tnacego do ciecia roslin energetycznych
Autorzy:
Rode, H.
Checinski, M.
Powiązania:
https://bibliotekanauki.pl/articles/793657.pdf
Data publikacji:
2016
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
cutting process
energy plant
basket willow
disc cutting
moisture
rotary speed
laboratory test
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2016, 16, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cognitive Educational Transaction: Assessment and Mediation of Pupil’s Cognitive Capacities
Transakcja poznawczo-edukacyjna: ocena i mediacja możliwości poznawczych ucznia
Autorzy:
Kovalčíková, Iveta
Miecznik-Warda, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/445823.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
mediacja
proces poznawczy
prędkość motoryczna
prędkość umysłowa
elastyczność poznawcza
mediation
cognitive stimulus transaction
cognitive process
motor speed
mental speed
cognitive flexibility
Opis:
At present, the subject of basic and applied research is becoming a specific type of educational transaction whose aim is to know the cognitive determinants of the educational process. Research findings relating to the brain and mind indicate that if we can gain a better understanding of a pupil’s cognitive apparatus, this may lead to more effective teaching of low-performing pupils. When considering the causes of a pupil’s unsatisfactory school performance, it is important to consider which elements of thinking require activation during information processing, or task performance. Knowing the aspects of motor and mental speed and cognitive flexibility of the pupil is the starting point for cognitive stimulus transactions. From this knowledge, subsequently generated transactions can be carried out in an individual intervention aimed at remediating the possible cognitive deficiencies in low performing pupils. In the paper we present the results of the pilot research (as a part of more complex experimental study ), the intention of which is to assess the suitability and the selection of appropriate research tools in the diagnosis of motor speed in pupils. The diagnosis is an introduction to research on the assessment of the impact of the relationship between the motor speed and the speed of information processing in a student on the their success in learning. The subjects are students aged 8-10, gender-diverse. During the diagnosis: Mira Stambak hatch tests, the "Looping" test, the rate of writing the word "house" by Elżbieta Grzegorzewska test, Rene Zazzo Card Test, Ozierecki test of motor speed development, test of cognitive functions Trail Making Test (TMT) Dean Delis, Edith Kaplan and Joel Kramer. The following have been taken into account: accuracy of the test, time needed to carry out the test, clarity of instructions, criteria for evaluation of results and interest of students. After analyzing the results, it has been found that the proper tests will be conducted with the following tests: Looping, Hatching and Trail Making Test.
Źródło:
Edukacyjna Analiza Transakcyjna; 2019, 8; 117-132
2299-7466
Pojawia się w:
Edukacyjna Analiza Transakcyjna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of the topping-up process of lubricating oil in medium-speed marine engines
Autorzy:
Młynarczak, Andrzej
Krzysztof, Rudzki
Powiązania:
https://bibliotekanauki.pl/articles/1573592.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
multi-objective optimisation
medium-speed marine engine
lubricating oil
soild impurities
alkalinity
topping-up process
Opis:
In this paper, we examine the problem of optimising the process of topping up lubricating oil in medium-speed marine engines. This process is one of the methods that can be applied to improve the properties of lubricating oil. The amount of fresh oil added to lubricating oil system always balances its consumption, but the method used to top up depends on the marine engineer. Small amounts of fresh oil can be added at short intervals, or large ones at long intervals, and the element of randomness often plays a significant role here. It would therefore be valuable to find a method that can help the mechanical engineer to choose the right strategy. We apply a multi-criteria optimisation method for this purpose, and assume that the criterion functions depend on the concentration of solid impurities and the alkalinity, which are among the most important aspects of the quality and properties of lubricating oil. These criterion functions form the basis for multi-objective optimisation carried out with the use of the MATLAB computer program.
Źródło:
Polish Maritime Research; 2021, 2; 78-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-domain analytical rotor model with buried permanent magnets in V-arrangement for high-speed applications
Autorzy:
Lauerburg, Maximilian
Toraktrakul, Polkrit
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/27309935.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
analytical calculation method
arrangement of buried permanent magnets
high-speed rotor morphology
multi-domain design process
Opis:
Different buried permanent magnet arrangements in rotors are compared based on electrical machines found in literature regarding high-speed capability. An analytical approach is presented to analytically calculate mechanical stresses in the bilateral and central bridge of V arrangements in order to determine the achievable circumferential velocity of a rotor geometry. The mechanical model is coupled to an analytical model which can determine the flux density in the main air gap under consideration of flux leakage within the rotor. The multi-domain model enables the analytical design of high-speed rotors with buried permanent magnets in V-arrangement.
Źródło:
Archives of Electrical Engineering; 2023, 72, 3; 629--641
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of diagnostic utility of instantaneous angular speed fluctuation of diesel engine crankshaft
Autorzy:
Dereszewski, M.
Charchalis, A.
Polanowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/244646.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
two-stroke diesel engine diagnostics
diagnostics of combustion process
angular speed variation
angular acceleration
moving approximation
Opis:
Frequent crew rotation, a shorthand, and various levels of technical crew skills, are the facts with the ship-owners has to cope very often. Having the proper level of engine exploitation as a main objective is necessary to implement a constant engine monitoring system, in order to obtain quick and reliable diagnostic information. One cannot omit the financial aspect of monitoring system implementation, created by its price and costs of service. In this paper, the analysis of diagnostic utility of the signal deriving from a propulsion shaft fluctuation during its one revolution is presented. The angular speed of the shaft was measured using a laser sensor of torque meter ETNP-10. Diagnostic utility validation has been verified on a basis of combustion quality, in cylinders of two-stroke, turbocharged Marine Diesel Engine. Test was carried out on board of a container vessel during its sea passage. In order to evaluate the effectiveness of the method, the crew simulated engine’s malfunction by fuel injection cut-off in various cylinders (only one in the same time).The interference signals decomposition was carried out using the method of synchronous averaging and moving approximation with polynomial of 3rd exponent.
Źródło:
Journal of KONES; 2011, 18, 1; 123-128
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of process conditions and fillers addition on extrusion-cooking efficiency and SME of thermoplastic potato starch
Wplyw parametrow procesu i dodatku wypelniaczy na wydajnosc i energochlonnosc ekstruzji termoplastycznej skrobi ziemniaczanej
Autorzy:
Oniszczuk, T.
Wojtowicz, A.
Mitrus, M.
Moscicki, L.
Combrzynski, M.
Rejak, A.
Gladyszewska, B.
Powiązania:
https://bibliotekanauki.pl/articles/793031.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
thermoplastic starch
potato starch
filler
extrusion-cooking
screw speed
energy consumption
flax fibre
cellulose
process condition
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of boom vibrations of the road header during cutting based on the analysis of images from high-speed cameras
Autorzy:
Cheluszka, Piotr
Mann, Rajmund
Powiązania:
https://bibliotekanauki.pl/articles/2064426.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
road header
cutting process
vibrations
measurement
high-speed camera
kombajn chodnikowy
proces urabiania
wibracje
pomiary
kamera szybka
Opis:
Excavation, especially of hard rocks, using boom-type road headers is a source of strong vibrations of the boom in which they are equipped. These vibrations are transferred through construction nodes further to the turntable and the body of the road header. On the one hand, they are of great importance from the point of view of the durability and the reliability of the mining machine. On the other hand, they affect the variability of the parameters at which the process of cutting the heading face surface of a drilled roadway or tunnel is carried out. For the purpose of determining the vibration intensity of the boom of the road header a photogrammetry system based on two high-speed cameras Phantom Miro LC 120 was used. During the experimental investigations of the cutting process of a cement-sand block using the R-130 road header, the boom and turntable movements were recorded. The analysis of the time-lapse pictures of the recorded footage obtained from the high-speed cameras using dedicated TEMA 3D software allowed to determine the spatial trajectory of movement of the boom and the turntable during the cutting of the massive with specified mechanical properties with set values of the parameters of this process. Basing on the time courses of the coordinates of the boom and turntable characteristic points, the courses of the actual boom swinging speed and acceleration components of its vibrations were determined. The intensity of these vibrations was related to the conditions of the cutting process.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 37--49
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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