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Tytuł:
Effectiveness of friction force reduction in sliding motion depending on the frequency of longitudinal tangential vibrations, sliding velocity and normal pressure
Autorzy:
Leus, Mariusz
Gutowski, Paweł
Rybkiewicz, Marta
Powiązania:
https://bibliotekanauki.pl/articles/27314317.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
reduction of friction force
vibrations
experimental verification
Opis:
The article presents the results of experimental research and simulation analyses of the influence of slip velocity, normal pressures and vibration frequency on the effectiveness of friction force reduction carried out in sliding motion in the presence of forced tangential vibrations. In experimental studies, changes in the driving force were measured during the slip of the upper body over the vibrating lower body. The direction of these vibrations was parallel both to the contact plane and to the direction of movement of the shifted body. The simulation tests were carried out in the Matlab/Simulink environment through the use of numerical procedures that were specially created for this purpose. Dynamic friction models considering the tangential compliance of contact and the phenomenon of pre-sliding displacement were used for calculations. The paper presents the designated values of the so-called coefficient of average friction force reduction in sliding motion for the following friction pairs: steel C45–steel C45, steel C45–cast iron GGG40 and steel C45–polytetrafluoroethy-lene PTFE (Teflon). The results of numerical analyses were in good agreement with those of experimental tests. A significant dependence of the level of average friction force reduction on the frequency of forced vibrations, sliding velocity as well as the kind of sliding pair material, and normal pressures was shown.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 4; 490--498
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research of the reconfigurable multimodular mechatronic system for inside work
Autorzy:
Kotova, E.
Korotynsky, A.
Kirchenko, V.
Zharov, V.
Powiązania:
https://bibliotekanauki.pl/articles/386402.pdf
Data publikacji:
2008
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
robotyka
badanie eksperymentalne
multimodular system
robotics
experimental research
Opis:
The urgency of the multimodularity concept in a modern robotics is connected to increase of requirements to the created mobile technical systems intended for performance of the broad variety of tasks, including problems of development of space, safety of ability to live and counteraction to terrorism. The modular approach is considered to be the most perspective. There are considered functionalities of multimodular system of wheel type and given characteristics of working breadboard models of modules. The purposes are formulated and results of experimental researches are given.
Źródło:
Acta Mechanica et Automatica; 2008, 2, 4; 44-50
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Doświadczalno – numeryczna analiza procesu pękania stali ferrytycznej 13HMF
Experimental-numerical analysis of the fracture process for ferritic steel 13HMF
Autorzy:
Graba, M.
Powiązania:
https://bibliotekanauki.pl/articles/386730.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stal
analiza doświadczalna
pękanie
steel
experimental analysis
fracture
Opis:
W pracy zostanie przedstawiona analiza procesu pękania stali ferrytycznej 13HMF, oparta na szeregu badań doświadczalnych, które wzbogacona szeregiem obliczeń numerycznych. Analiza dotyczyć będzie elementów konstrukcyjnych badanych w warunkach niskich temperatur. Zaprezentowane zostaną zmiany własności mechanicznych, odporności na pękanie, zdjęcia pękniętych przełomów, jak również szereg wyników numerycznych, w postaci rozwijających się stref plastycznych oraz rozkładów naprężeń rozwierających powierzchnie pęknięcia.
In the paper, an analysis of the fracture process for the ferritic steel 13HMF will be presented, which will be based on a series of the experimental studies. To verification of the all experiments, relevant numerical calculations will be done. Both – experimental and numerical analysis will concern the components tested at low temperatures. The changes of the mechanical proper- ties, fracture toughness and numerical results, such as plastic zones or opening stress distributions will be presented.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 3; 41-50
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental evaluation of circuit board components under extreme conditions
Autorzy:
Sokół, Krzysztof
Ptak, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2106230.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
experimental test
mathematical model
semiconductor diodes
thermal chamber
WCA
Opis:
Designing products operating in harsh conditions is a challenging task. Years of experience, developed standards and good practices are crucial in achieving the intended result. The article shows a methodology for designing electronic systems based on the worst-case analysis (WCA) and comparing its outcomes with the experimental verification of an actual circuit through large-scale tests. The analysed diode-based semiconductor circuit is part of a temperature measuring system of industrial application. The objective of the design and analysis process is to achieve a reliable solution, which has all the required functionalities under actual, extreme operating conditions. The preliminary circuit design is developed using ideal components. The truth table, which represents customer requirements, is created to check the correct operation of the system. Simulation software, such as LTSpice, are used as the main tools to verify the correct functioning based on ideal or close-to-real component models. Next, based on the results of computer simulations, the WCA is conducted, considering all extreme (worst) operating environment parameters, such as, among others, ambient temperature or ageing. WCA results were verified through an experimental, large-scale measurement of the real system, with defined forward voltage as a function of the current flowing through the semiconductor at various ambient temperatures.
Źródło:
Acta Mechanica et Automatica; 2022, 16, 1; 8--15
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania eksperymentalne wyrywania arkusza z warstwy klejowej grzbietu książki
Eksperimental investigations of the pulling out the sheet from the book spine adhesive layer
Autorzy:
Petriaszwili, G.
Pyryev, Y.
Powiązania:
https://bibliotekanauki.pl/articles/387015.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
badanie eksperymentalne
wytrzymałość materiałów
wytrzymałość
experimental researches
strength
strength of materials
Opis:
Produkowane obecnie urządzenia do oceny wytrzymałości książek różnią się konstrukcją oraz parametrami testowania opraw, co skutkuję różnymi wynikami badań wytrzymałości tych samych opraw zbadanych na różnych aparatach testujących. Jednym z najważniejszych parametrów wpływającym na wynik pomiaru jest kąt otwarcia książki. W pracy przedstawiono wyniki badań eksperymentalnych wpływu kąta otwarcia oprawy na wynik wytrzymałości sklejonej książki. Uzyskane wyniki badań eksperymentalnych umożliwiają uwzględnienie wpływu kąta otwarcia oprawy na wynik oceny wytrzymałości przy badaniach opraw na różnych maszynach testujących.
Currently produced devices to evaluate the durability of books differ in design and testing parameters, which result in different value of the strength of the same books tested at different test apparatus. One of the most important parameters affecting the measurement result is the opening angle of the book. The research study investigated the influence of the angle of opening book on the Pull Test value of durability of the book spine adhesive layer. The results of experimental studies allow to learn the influence of the angle of opening book for the strength value of the books tested on different testing machines.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 3; 68-70
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of brittle fracture criteria for bimaterial structures
Autorzy:
Mieczkowski, G.
Molski, K.
Powiązania:
https://bibliotekanauki.pl/articles/387156.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fracture criteria
interfacial crack
delamination
experimental tests
kryteria pękania
rozwarstwianie
test eksperymentalny
Opis:
The increasing application of composite materials in the construction of machines causes strong need for modelling and evaluat-ing their strength. There are many well known hypotheses used for homogeneous materials subjected to monotone and cyclic loading conditions, which have been verified experimentally by various authors. These hypotheses should be verified also for composite materials. This paper provides experimental and theoretical results of such verifications for bimaterial structures with interfacial cracks. Three well known fracture hypotheses of: Griffith, McClintock and Novozhilov were chosen. The theoretical critical load values arising from each hy-potheses were compared with the experimental data including uni and multi-axial loading conditions. All tests were carried out with using specially prepared specimens of steel and PMMA.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 1; 44-48
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja parametrów tarcia i zużycia polimerów wzmacnianych włóknem węglowym w różnych środowiskach pracy
The identifications of friction and wear processes of polymers strengthen with carbon fibers in different environments
Autorzy:
Wilczewska, I.
Kaczyński, R.
Powiązania:
https://bibliotekanauki.pl/articles/387532.pdf
Data publikacji:
2009
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
tarcie
polimery
analiza mikroskopowa
badania doświadczalne
friction
polymers
microscopic analysis
experimental examinations
Opis:
W pracy przedstawiono badania doświadczalne, analizę mikroskopową oraz analizę składu chemicznego dwóch par ciernych złożonych z polimerów wzmacnianych włóknami węglowymi oraz stali łożyskowej po tarciu w trzech środowiskach: powietrzu, wodzie oraz oleju. Badania doświadczalne wykonano za pomocą tribotestera T-11, gdzie realizowany jest schemat pary ciernej typu trzpień-tarcza. W pracy podjęto próbę identyfikacji rodzajów zużycia polimerów wzmacnianych włóknem węglowym pracujących w różnych środowiskach. Przedstawiono także, krótką analizę procesów tarcia i zużycia kompozytów w nawiązaniu do binarnego charakteru pracy analizowanych par ciernych.
In the paper results of: experimental researches, microscopic analysis and chemical constitution of two tribological couples consist of: plastic strengthen with carbon fibers and bearing steel, working in three environments: air, water and oil, were presented. The researches were executed using T-11 tribotester machine, where pin-on-disc frictional couple scheme was realized. In the paper, identification of wear type of polymers strengthen with carbon fibers working in different environments, was undertaken. The short analysis of friction and wear phenomenon of composites was presented taking into consideration the binary scheme work of analyzed friction couples.
Źródło:
Acta Mechanica et Automatica; 2009, 3, 2; 106-110
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of clearances in a drive system on dynamics and kinematics of a telescopic crane
Autorzy:
Trąbka, A.
Powiązania:
https://bibliotekanauki.pl/articles/386891.pdf
Data publikacji:
2015
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
clearances
drive system
experimental telescopic crane
multibody dynamic systems
układy napędowe
żurawie teleskopowe
Opis:
The paper presents the results of numerical analyses that were carried out in order to evaluate how a change in a size of a clearance in a slewing motion drive system of a telescopic crane influences the movement of a load and the dynamic loads of a structure. A computational model was developed based on a real structure of an experimental crane by using the ADAMS software. The analyses showed that a circumferential clearance at the output of a reduction gear, which is less than 1º, does not adversely affect the precision of the load movement. An excessive clearance leads to losing fluidity of a body slewing motion and to changes in the trajectory of the load.
Źródło:
Acta Mechanica et Automatica; 2015, 9, 1; 9-13
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the support system’s kinematic structure on selected kinematic and dynamic quantities of an experimental crane
Autorzy:
Trąbka, A.
Powiązania:
https://bibliotekanauki.pl/articles/387073.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
experimental crane
multibody systems
supports
unilateral constraints
bilateral constraints
żuraw
układy wieloczłonowe
wspornik
Opis:
This paper presents a comparative analysis of two kinematic structures of the support system (with supports with bilateral and unilateral constraints), which were used in an experimental model of a crane. The computational model was developed by using the ADAMS software. The impact of the kinematic structure of the support system on selected kinematic and dynamic values that were recorded during the slewing motion was analysed. It was found, among other things, that an increased number of degrees of freedom of the support system leads to multiple distortions of time characteristics of kinematic and dynamic quantities.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 4; 189-193
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure analysis of beam composite elements subjected to three-point bending using advanced numerical damage models
Autorzy:
Różyło, Patryk
Powiązania:
https://bibliotekanauki.pl/articles/2204651.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
three-point bending
carbon-epoxy laminate
numerical simulation
experimental tests
finite element method
failure
Opis:
This paper deals with the experimental and numerical analysis of three-point bending phenomenon on beam composite profiles. Flat rectangular test specimens made of carbon–epoxy composite, characterised by symmetric [0/90/0/90]s laminate ply lay-up, were used in this study. Experimental testing was carried out with a COMETECH universal testing machine, using special three-point bending heads. In addition, macroscopic evaluation was performed experimentally using a KEYENCE Digital Microscope with a mobile head recording real-time images. Parallel to the experimental studies, numerical simulations were performed using the finite element method in ABAQUS software. The application of the above-mentioned interdisciplinary research techniques allowed for a thorough analysis of the phenomenon of failure of the composite material subjected to bending. The obtained research results provided a better understanding of the failure mechanism of the composite material.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 1; 133-144
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental setup for testing rotary mr dampers with energy harvesting capability
Autorzy:
Sapiński, B.
Węgrzynowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/386685.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
obrotowy tłumik MR
instalacja eksperymentalna
uzyskiwanie energii
MR rotary damper
experimental set-up
energy harvesting
Opis:
The experimental setup has been developed for laboratory testing of electromechanical energy transducers and rotary magne-torheological (MR) dampers. The design objectives are outlined and the parameters of the key elements of the setup are summarised. The structure of the mechanical and measurement and control systems is presented. Results of functional testing of a newly developed trans-ducer and a MR rotary damper are summarised.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 4; 241-244
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crushing behaviour of the PVC foam loaded with beaters of various shapes
Autorzy:
Bogusz, P.
Gieleta, R.
Stankiewicz, M.
Konarzewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/387664.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
polymer foam
polyvinyl chloride foam
hitting with a blunt object
energy absorption
impact tests
experimental mechanics
Opis:
Statistically, at least 50% of all injuries experienced by police officers in the line of duty are due to assaults with blunt objects. Therefore, vests used by the police should provide not only good ballistic resistance, but also good protection against such threats. Foamed materials are possible to be used for body protectors or inserts of protective clothes. The effects of dynamic impact with beaters of different shapes onto behaviour of polymeric foamed material were determined. There were used four types of beaters: flat, cylindrical, edgy and cornered. Strikes with blunt objects such as a flat board, baseball bat, edgy brick, pavement brick or a sharp stone, to which a protective ware can be subjected, were simulated. The impact load was applied to the rectangular specimens, made of polyvinyl chloride foam, with a usage of a drop hammer. Plots of force versus compression for all the tested samples were obtained and analysed. The effects of impacts with beaters of different shapes onto foamed material samples were presented. A shape of the blunt object significantly influences crushing behaviour of the foamed material. The impact energy of a flat beater is absorbed effectively on a short distance, since it is spread on a relatively large surface. The cylindrical and edgy beaters did not cause fragmentation of the samples, however, on the upper surfaces of the samples, permanent deformations mapping the beaters shapes as well as some cracks occurred. An impact with a sharp object, for example, a cornered beater is very difficult to be neutralized by the foam material, because it is cumulated on a small area.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 1; 23-30
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of different random pattern creation forms on the results of experimental modal analysis performed by high-speed digital image correlation
Autorzy:
Hagra, M.
Schrötter, M.
Lengvarsky, P.
Powiązania:
https://bibliotekanauki.pl/articles/970570.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
digital image correlation
experimental modal analysis
random pattern
Modan3D
korelacja obrazu cyfrowego
eksperymentalna analiza modalna
Opis:
In this contribution an influence of random contrast patterns creation on the quality of the obtained results of experimental modal analysis performed by high-speed digital image correlation is described. Three common forms of random pattern creation were investigat-ed. While the first form was presented by the black speckles printed on white matt vinyl foil and bonded on the sample surface, in the sec-ond and the third case, respectively, the black speckles were sprayed on white sprayed sample surface or on paint white one. For the pur-poses of modal parameters estimation in the form of natural frequencies, mode shapes and damping ratios the program called Modan3D, developed in the authors department, was used. The results obtained by Modan3D were compared with the results achieved by system Pulse specialized for vibration analysis.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 1; 22-26
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations into the stability of thin-walled composite structures with top-hat cross-sections
Autorzy:
Czajka, Błażej
Powiązania:
https://bibliotekanauki.pl/articles/2204593.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
buckling
post-buckling equilibrium paths
critical loads
thin-walled composite structures
finite element method
FEM
experimental tests
Opis:
This paper presents a study of compressed thin-walled composite columns with an open cross-section. The tested specimens with a top-hat cross-section were made of CFRP material. Two arrangements of composite layers [0/-45/45/90]s and [90/0/90/0]s were compared. The paper focuses on the buckling phenomenon and the determination of the critical loads of the structure. It includes both numerical analyses using the finite element method (FEM) and validation on real specimens made using the autoclave technique. A comparison is made between the results obtained by both methods. The critical forces of the real specimens were determined using the P-wc3 approximation method. Both the evaluation of the buckling shape and the values of the critical forces showed a significant correlation between the experimental and numerical tests. This paper also compares the tested lay-ups.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 3; 311--316
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of layers distribution in the composite coupon using finite element method and three point bending test
Autorzy:
Mazurkiewicz, Ł.
Małachowski, J.
Damaziak, K.
Baranowski, P.
Gotowicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/387164.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fibre reinforced composite
FE analysis
hand lay-up technique
experimental validation
kompozyt włóknisty
analiza elementów skończonych
weryfikacja doświadczalna
Opis:
The main objective of the study is to develop experimentally validated FE model and perform numerical analysis of layered composites made by hand lay-up techniques during tension and bending test. The research object is glass - polyester laminate made of four unidirectional layers. In order to validate the numerical models experimental test were performed. Due to the very different stiffness modulus in tension and bending loading the material properties obtained from standard test are not suitable to apply in numerical model. Significantly different behaviour compared to experimental test was obtained for tree point bending where the numerical model becomes too stiff. Simple coupons, relatively easy to manufacture presented in the paper have very low quality. The differences in actual and theoretical bending stiffness (obtained from tension stiffness) exceed 70%. In order to represent the actual structure the layers of the composite were divided by resin layers and also additional resin layer at the top and bottom of the model were defined. Single stage optimization process was used to adjust the material layout. After layer set-up modification very significant improvement can be seen for flexural behaviour.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 3; 160-165
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
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