Wyniki wyszukiwania - BazTech

1

Symulacja numeryczna zderzenia pojazdu z aluminiowym, wkopywanym słupem oświetleniowym

Danek W., Gąsiorek D.

Modelowanie Inżynierskie

|

2018

|

T. 35, nr 66

25--30

PL

W artykule został przedstawiony proces przygotowania modelu numerycznego z zastosowaniem metody elementów skończonych zaimplementowanej w środowisku LS Dyna. Ma na celu symulowanie zderzenia pojazdu z wkopywanym, aluminiowym słupem oświetleniowym. Został wykonany do wyznaczenia wartości wskaźnika intensywności przyspieszenia (ASI), dla prędkości 35 km/h oraz prędkości 100 km/h oraz określenia zachowania się słupa o tej konstrukcji w trakcie zderzenia. Wykonany model zostanie zastosowany w przyszłości do optymalizacji postaci konstrukcyjnej słupa w celu zredukowania wartości współczynnika ASI.

EN

The paper presents process of preparation of a numerical model using Finite Element Method implemented in LS Dyna Software. Numerical model was made in order to simulate car crash with root mounted, aluminum lighting column. It was made to determine the value of the Acceleration Severity Index (ASI) for two different velocities: 35km/h and 100km/h and determine the behavior of this kind of lighting column during the collision. Prepared model will be used to shape optimization of the lighting column in order to reduce value of ASI coefficient.

2

Mechatronic device for locomotor training

Duda S., Gąsiorek D., Gembalczyk G., Kciuk S., Mężyk A.

Acta Mechanica et Automatica

|

2016

|

Vol. 10, no. 4

310--315

EN

This paper presents a novel mechatronic device to support a gait reeducation process. The conceptual works were done by the interdisciplinary design team. This collaboration allowed to perform a device that would connect the current findings in the fields of biomechanics and mechatronics. In the first part of the article shown a construction of the device which is based on the structure of an overhead travelling crane. The rest of the article contains the issues related to machine control system. In the prototype, the control of drive system is conducted by means of two RT-DAC4/PCI real time cards connected with a signal conditioning interface. Authors present the developed control algorithms and optimization process of the controller settings values. The summary contains a comparison of some numerical simulation results and experimental data from the sensors mounted on the device. The measurement data were obtained during the gait of a healthy person.

3

Symulacje numeryczne zjawisk dynamicznych w układzie pantograf - sieć jezdna

Wątroba P., Duda S., Gąsiorek D.

Modelowanie Inżynierskie

|

2015

|

T. 23, nr 54

94--100

PL

W artykule przedstawiono komputerowe narzędzia i metodykę modelowania pozwalające symulować zachowanie pantografu z uwzględnieniem zjawiska kontaktu pomiędzy pantografem i siecią jezdną. Do tego celu wykorzystano środowisko Matlab/Simulink, w którym opracowano dynamiczny model pantografu w konwencji układów wieloczłonowych. Odkształcalny model sieci zbudowano z zastosowaniem metody elementów skończonych, a następnie opracowano model kontaktu z wykorzystaniem teorii Hertza, który opisuje interakcję pomiędzy pantografem a siecią jezdną. Ponadto w modelu zaimplementowano algorytm obliczający siłę aerodynamiczną oddziałującą na pantograf w zależności od wysokości uniesienia pantografu oraz prędkości jazdy. Przeprowadzone symulacje numeryczne pozwoliły wyznaczyć siły w punkcie kontaktu dla określonych warunków jazdy.

EN

The paper describes the modeling methodology and computer software which presents the simulation of the pantograph behavior. It considers also the contact between pantograph and the catenary. For this purpose author used the Matlab-Simulink environment, which has developed the dynamic model of pantograph by the dynamic multibody model convention. The deformable model was built using the Hertz theory, which describes the interaction between pantograph and the catenary of the vertical contact system. Furthermore, model implemented the algorithm which calculated the strength of aerodynamic forces in the pantograph. It depends on the amount of the pantograph elevation and its driving speed. The numerical simulations have designated the force at the point of contact for certain driving conditions.

4

Badanie własności mechanicznych blach presensybilizowanych

Gąsiorek D., Machoczek T., Danek W.

Modelowanie Inżynierskie

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2014

|

T. 20, nr 51

23--27

PL

W pracy przedstawiono proces badania własności mechanicznych blach presensybilizowanych. Badania obejmowały przygotowanie próbek z arkuszy blach za pomocą obróbki skrawaniem oraz eksperyment na maszynie wytrzymałościowej. Na ich podstawie zostały określone własności mechaniczne, a także zależności pomiędzy kierunkami walcowania blach.

EN

In this work was shown a process of testing the mechanical properties of offset plates. The study included the preparation of samples of metal sheet using the milling and experimental research. On the basis of their mechanical properties were determined relations between the direction of sheet rolling.

5

Analiza przepływu powietrza w układzie chłodzenia pojazdu gąsienicowego

Danek W., Ławniczek R., Klein W., Gąsiorek D.

Modelowanie Inżynierskie

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2014

|

T. 19, nr 50

13--18

PL

W artykule przedstawiono analizę przepływu powietrza w układzie chłodzenia pojazdu gąsienicowego. Celem pracy jest dobór wentylatorów, które zapewnią właściwą temperaturę pracy silników (medium w układzie chłodzenia musi zapewnić odpowiednie warunki pracy dające możliwość działania z maksymalną sprawnością, tj. dla przyjętego silnika spalinowego pracę w zakresie temperatur 80-96°C, natomiast dla przyjętych silników elektrycznych pracę w zakresie temperatur 50-55°C). Opisano koncepcję układu chłodzenia, dobór wentylatorów osiowych chłodnic silników elektrycznych oraz symulacje numeryczne wykonane za pomocą oprogramowania ANSYS CFX.

EN

In this work the authors present an analysis of the air flow in the cooling system of a tracked vehicle. It is aimed at the selection of fans to ensure proper engine operating temperature (medium in the cooling system must provide a suitable working conditions for maximum efficiency, ie the adopted internal combustion engine works in the temperature range 80-96°C, while the adopted electric motors work in the temperature range 50-55°C). Work includes the concepts of the cooling system, the initial selection of the axial fan for cooling electric motors and numerical simulations performed using ANSYS CFX software to determine the air flow for cooling the internal combustion engine in order to select a radial fan.

6

Identyfikacja cech dynamicznych konstrukcji urządzenia mechatronicznego do treningu lokomotorycznego z wykorzystaniem analizy modalnej

Kciuk S., Gąsiorek D., Duda S.

Górnictwo Odkrywkowe

|

2014

|

R. 55, nr 4-5

111--115

PL

W artykule przedstawiono zastosowanie eksperymentalnej analizy modalnej do wyznaczania właściwości dynamicznych konstrukcji. Opisano przebieg oraz wyniki badań konstrukcji prototypowego urządzenia do treningu lokomotorycznego. W trakcie badań wyznaczano częstotliwości oraz postacie drgań rezonansowych obiektu, a także widmowe funkcje przejścia. Wyniki badań zostały wykorzystane do modyfikacji właściwości dynamicznych urządzenia oraz do weryfikacji modeli numerycznych obiektu będącego przedmiotem badań.

EN

In this paper it has been presented the application of experimental modal analysis to determine the dynamic properties of the structure. The course and results of the investigations of construction of a prototype device for locomotor training have been described. During the tests, frequency of the resonant modes of vibration object, and spectral transfer functions were determined. The investigation’s results were used to modify the dynamic properties of the device and to verify numerical models of the object being studied.

7

Causes of edge deflection in stack cutting of aluminum sheets

Gąsiorek D., Duda S., Machoczek T., Rak Z.

Modelowanie Inżynierskie

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2013

|

T. 16, nr 47

69--74

EN

In the process of cutting sheet metal using guillotine, defects may occur in the section of the machined object, resulting in the impossibility to perform further machining of the material (sheet metal). The publication presents the process of edge bending during bundle cutting of sheet metal. The experiments have been conducted using an original test stand and high speed Phantom cameras have been applied in the tests. The paper presents a study based on previous work carried out at the Department of Theoretical and Applied Mechanics.

PL

W trakcie przeprowadzania procesu cięcia pakietu blach na gilotynie, w przekroju przedmiotu poddanego obróbce, mogą pojawić się defekty, których skutkiem jest niemożność dalszych procesów obróbkowych materiału (blach). W pracy przedstawiono proces powstawania zagięcia i pionowego uszkodzenia krawędzi blach podczas cięcia pakietów blach na gilotynie. Badania eksperymentalne przeprowadzono na autorskim stanowisku badawczym, a do badań zastosowano kamery do pomiaru zjawisk szybkozmiennych Phantom. W pracy zaprezentowano badania bazujące na wcześniejszych pracach prowadzonych w Katedrze Mechaniki Teoretycznej i Stosowanej.

8

Numerical verification of effort in mechanical construction of prototype manipulator for rehabilitation

Gąsiorek D., Gembalczyk G., Kciuk S., Machoczek T.

Modelling and Optimization of Physical Systems

|

2013

|

z. 12

21--28

EN

The work presents the results of a stereomechanical analysis of a support system for a prototype manipulator for rehabilitation. The presented study concerns the compensator, crane trolley and the frame. The stereomechanical analysis has been conducted in the Ansys environment using finite elements method. Beam and solid models have been assumed for the support system.

PL

W pracy przedstawiono wyniki analizy stereomechanicznej układu nośnego prototypowego manipulatora rehabilitacyjnego. Przedstawiono badania dla kompensatora, wózka jezdnego oraz ramy. Analizę stereomechaniczną wykonano w środowisku Ansys metodą elementów skończonych. Do analizy przyjęto modele bryłowe i belkowe dla konstrukcji nośnej.

9

The application of the smoothed particle hydrodynamice (SPH) method and the experimental verification of cutting of sheet metal bundles using a guillotine

Gąsiorek D.

Journal of Theoretical and Applied Mechanics

|

2013

|

Vol. 51 nr 4

1053--1065

EN

The article presents the application of the SPH method for the modeling of cutting composite bundles using a guillotine. For many years, the SPH method has been applied in the modeling of dynamic phenomena in which rapid strain and large deformations occur. The discrete model has been performed by combining the FEM and the SPH. The SPH method has only been applied for to the fragment in which the material separation during cutting appears. To verify the numerical results, experiments have been performed using a special test stand for the confirmation of the correctness of the developed model and the numerical simulations.

10

Metallographic investigations of metal plate edges after cutting

Gąsiorek D., Mężyk A., Skibniewski A., Głuchowski W.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

|

Vol. 60, nr 1

31--38

EN

Purpose: Cutting sheets of various materials is a commonly used product finishing process in industrial conditions. If high quality of cut edges is required, defects caused by cutting on a guillotine make this process of finishing practically unsuitable. The Authors evaluated quality of plates after cutting in laboratory, on industrial guillotine and a rotary slitter, in order to specify a cutting method least disturbing to the product’s edge. Design/methodology/approach: Samples of multi-layered aluminium lithographic plates, divided by cardboard and paper sheets were cut in industrial conditions on a guillotine and a rotary slitter. A specially designed laboratory test stand was built, allowing measurements of forces and applying a vertical, controlled movement of the cutting blade. Surfaces of edges of the samples were examined with the use of a Scanning Electronic Microscope; results of these scans were compared and evaluated. Findings: Comparison of surfaces after cutting allowed drawing conclusions regarding methods causing minimum disturbances to the cut edges. The best quality of the cut edges was obtained on a laboratory guillotine test stand, applying a unique, vertical movement of the cutting blade. Research limitations/implications: Results of laboratory experiments should be continued and verified on larger scale in industrial conditions. Practical implications: If vertical cutters could deliver the same edge quality as rotary slitters, a substantial reduction of production costs can be expected as in many cases guillotines are far more efficient than rotary slitters. Originality/value: Vertical, controlled movement of the blade during cutting metal sheets offers substantial advantages to the finishing process compared to standard guillotine cutting. In all cases, when high quality of the edge surface is required, proposed vertical cutting combines high efficiency with simplicity of operations and assures high quality of the finished products.

11

FEM simulation of Ductility Minimum Temperature (DMT) phenomenon in CuNi25 alloy

Sakiewicz P., Nowosielski R., Babilas R., Gąsiorek D., Pawlak M.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

|

Vol. 61, nr 2

274--280

EN

Purpose: The aim of this paper was to check by three dimensional Finite Element Method simulations the possibility of existence the non-uniform deformation hypothesis as a cause of Ductility Minimum Temperature phenomenon (DMT) in CuNi25 alloy. The necessary information and mechanical properties have been collected during elevated temperature tensile tests and other research and analysis of microstructure changes in material after deformation at the range of DMT existence. Experimental results were compared with three dimensional finite element method (FEM) simulation. Design/methodology/approach: Numerous techniques were used to characterize properties of material: high temperature tensile tests, finite element method, transmission electron microscopy, scanning electron microscopy. Findings: During the experimental studies the course of elongation curves has been determined. The stress in material after deformation at elevated temperature was analysed by FEM simulation. It has been confirmed the possibility of existence the inhomogeneous deformation hypothesis as a cause of DMT phenomenon. Practical implications: Understanding of material properties during high temperature deformation leads to selection of the appropriate production parameters and reductions of cost, helps to avoid destruction of material during production or operating. FEM simulations can help to reduce the costs of multiple destructive tests to determine material properties. Originality/value: FEM simulation and investigations of this CuNi25 alloy complete knowledge about mechanical properties of this material and help us develop correct parameters for more effective technologies for material production and exploitation.

12

Fluid-structure simulation of a valve system used in hydraulic dampers

Czop P., Gąsiorek D., Gniłka J., Sławik D., Wszołek G.

Modelowanie Inżynierskie

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2012

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T. 14, nr 45

197--205

EN

The aim of this paper is to develop a method for optimizing the design of a disc spring valve system by reducing the aeration and cavitation effect which negatively influences the performance of a shock absorber. A fluid structure interaction (FSI) model is used in order to modify the geometry of the valve interior and, in turn, to achieve better performance of a shock absorber. The paper analyzes the pressure distribution along theflow paths inside the valve cavity to reduce the risk of aeration and cavitation, while other important engineering aspects are omitted, e.g. durability of disc-spring valve systems as discussed in [1]. A key measure of valve improvement was chosen as deterioration of the damping force level generated by a shock absorber vs. the number of cycles during continuous cycling of the damper . The objectives of this work are as follows: (i) to present a process for reducing the complexity of the geometry of a disc spring valve system in order to perform a combined fluid-structure simulation, (ii) to show keysteps of the simulation process focusing on interactions between fluid and structure domain and to review relevant simulation results, (iii) to describe practical aspects of the simulation process, including basic parameters and boundary conditions related to the applied commercial software, (iv) to make an optimization case study to show the application scope for the simulation methodology proposed in the paper, and to confront the simulation results with experimental investigations.

13

A computational fluid flow analysis of a disc valve system

Czop P., Śliwa P., Gniłka J., Gąsiorek D., Wszołek G.

Journal of KONES

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2011

|

Vol. 18, No. 1

117-122

EN

Noise concerns in shock absorbers can be divided into two categories. The first is fluid flow noise, or “swish noise”, caused by the oil being forced through openings in the valves. The type and temperature of the oil, its velocity and the orifice geometry all have an effect on this. In addition, the structural design of the shock absorber shell may either reduce or amplify the noise. The second type of shock absorber noise is often described as regular operational noise or “chuckle noise”. It can be observed in vehicles during low-displacement, higher-frequency events, such as driving over a slightly rough road. This effect measurable as a force discontinuity into the vehicle and can come from a number of sources in the shock absorber, e.g. hydraulic transitions. It is often traceable to the valve discs closing and opening, but can also be caused by cavitation/aeration in the oil and air being pulled through the valves. The work on noise improvement reported in this paper has been started using conventional shock absorbers to be extended and will cover in the future variable damping shock systems as well. The paper gives an overview about the configurations of a typical valve system including three basic regimes of operation, which correspond to the amount of oil flowing through a valve cavity. The aim of this work was to propose a finite element fluid flow model, which can be used in order to reduce the velocity of fluid flow through a cavity of a shock absorber valve. High flow velocity can cause high-content frequency vibrations and, in turn, audible noise. The model will be used for initial screening of new valve concepts and on the other hand to improve the currently use ones.

14

Badania doświadczalne procesu cięcia pakietu blach na gilotynie

Mężyk A., Gąsiorek D., Kaczmarczyk J., Rak Z., Skibniewski A.

Przegląd Mechaniczny

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2010

|

nr 5

36-39

PL

W pracy przedstawiono badania doświadczalne procesu cięcia pakietu blach. Badania obejmowały pomiar sił cięcia przy zmiennych parametrach procesu, takich jak: szybkość cięcia, moment dokręcania śrub dociskających belkę, szerokość szczeliny pomiędzy nożem a belką dociskową i kąt ostrza noża. Otrzymane przebiegi siły cięcia w funkcji czasu lub przemieszczenia noża były podstawą do wyznaczania pracy mechanicznej i mocy cięcia.

15

A numerical calculations of fluid flow of a shock absorber valve

Gniłka J., Gąsiorek D., Czop P., Śliwa P., Wszołek G.

Modelling and Optimization of Physical Systems

|

2010

|

z. 9

29--36

EN

Noise concerns in shock absorbers can be divided into two categories. The first is fluid flow noise, or “swish noise”, caused by the oil being forced through openings in the valves. The type and temperature of the oil, its velocity and the orifice geometry all have an effect on this. In addition, the structural design of the shock absorber shell may either reduce or amplify the noise. The second type of shock absorber noise is often described as regular operational noise or “chuckle noise”. It can be observed in vehicles during low-displacement, higher-frequency events, such as driving over a slightly rough road. This effect measurable as a force discontinuity into the vehicle and can come from a number of sources in the shock absorber, e.g. hydraulic transitions. It is often traceable to the valve discs closing and opening, but can also be caused by cavitation/aeration in the oil and air being pulled through the valves. The work on noise improvement reported in this paper has been started using conventional shock absorbers to be extended and will cover in the future variable damping shock systems as well. The paper gives an overview about the configurations of a typical valve system including three basic regimes of operation which correspond to the amount of oil flowing through a valve cavity. The aim of this work was to propose a finite element fluid flow model which can be used in order to reduce the velocity of fluid flow through a cavity of a shock absorber valve. High flow velocity can cause high-content frequency vibrations and, in turn, audible noise. The model will be used for initial screening of new valve concepts and on the other hand to improve the currently use ones.

16

Analiza wytrzymałościowa endoprotezy stawu kolanowego

Tejszerska D, Długoszewski T., Gąsiorek D

Aktualne Problemy Biomechaniki

|

2010

|

z. 4

213--218

PL

W artykule przedstawiono analizę wytrzymałościową endoprotezy stawu kolanowego z wyłączeniem elementu udowego dla kilku wariantów obciążenia. Analiza ta pozwala na obserwację wpływu obciążenia na stan naprężeń i odkształceń w kości i endoprotezie. Model i jego analizę przeprowadzono metodą elementów skończonych w programie Ansys Workbench.

EN

Numerical strength analysis of total knee prosthesis without femur element for few variants of load was presented in this paper. This analysis allow us observe the influence of load on the state of stress and strain in tibia bone and prosthesis . The model and its finite element analysis was performed in ANSYS Workbench.

17

Interaktywne urzadzenia do rehabilitacji kończyn dolnych

Tejszerska D., Gzik M., Wolański W., Gąsiorek D., Gzik-Zroska B.

Modelowanie Inżynierskie

|

2009

|

T. 7, nr 38

243-250

PL

W pracy przedstawiono projekty urządzeń rehabilitacyjnych wykorzystujących nowoczesne technologie informatyczne do korekcji wad kończyn dolnych szczególnie dzieci i młodzieży. Ze względu na trudności w prowadzeniu rehabilitacji u dzieci proponuje się uatrakcyjnienie wykonywania koniecznych czynności poprzez zastosowanie interaktywnych zabawek rehabilitujących. Rehabilitacja będzie odbywać się na zasadzie nieświadomej zabawy przy pomocy specjalistycznych urządzeń podczas gry na komputerze. Aspekt zabawy jest szczególnie istotny ze względu na niechęć małych pacjentów do tradycyjnych metod kinezyterapii.

EN

This paper shows various designs of rehabilitation devices using modern informatics technologies for correction of lower limbs, especially at children and youth. Due to difficulties in rehabilitation in this group but also in order to make mandatory activities more attractive, application of interactive rehabilitation toys was proposed. The rehabilitation will go on with the help of specialist appliances during a computer game so the patient will be unaware of the process. The aspect of play is crucial with regards to an aversion of young patients for traditional methods of kinesytherapy.

18

Hybrid forklift propulsion system

Stachura A., Gąsiorek D., Mężyk A., Setlak R.

Modelling and Optimization of Physical Systems

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2008

|

z. 7

99--102

EN

Paper describes the basic concept of hybrid propulsion system designed for heavy duty forklift. Prototype powertrain will use permanent magnet motors to allow combustion engine downsizing what will result in fuel savings. Furthermore to lower the mass of the vehicle the standard battery pack will be replaced by the set of ultracapacitors. The new powertrain combined with advanced steering algorithms will reduce fuel consumption and emissions of greenhouse gases. Moreover downsizing of combustion engine will lower the manufacturing costs.

19

Najlepsi Twórcy - Najlepsze Produkty: Nauka projektowania dla młodych inżynierów

Cegiel L., Gąsiorek D., Kowalczyk M., Parczewski J.

Górnictwo Odkrywkowe

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2008

|

R. 49/2, nr 4-5

69-72

PL

Na rynku szkoleń inżynierskich praktycznie brak działań, nakierowanych bezpośrednio na pobudzanie twórczego myślenia. Skądinąd wiadomo, że najłatwiej jest zacząć za młodu - stąd nasza inicjatywa, skierowana do studentów. Szkoleniowe warsztaty Najlepsi Twórcy - Najlepsze Produkty realizowane są w formule wideokonferencyjnej i skupiają się na rozwijaniu takich umiejętności

EN

On market of engineering instructions practically lack of activities, directed immediately on actuating creative thinkings. From somewhere else it is known, that easy is to begin in young days - from here our initiative, directed to students. Of instruction workshops Best Creators - Best Products realized are in formula video-conferences and assemble on unrolling such skills.

20

Stress distribution around a TKR implant are lab results consistent with observational studies?

Kusz D., Wojciechowski P., Cieliński Ł.S., Iwaniak A., Jurkojć J., Gąsiorek D.

Acta of Bioengineering and Biomechanics

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2008

|

Vol. 10, no. 4

21-26

EN

Malalignment of Total Knee Replacement prosthesis has been reported to limit the implant survival time. We hypothesized that this may be secondary to excessive stress occurring at the bone-implant interface, resulting from abnormal load transfer across the knee joint. In this study, we conducted Finite Element Analysis of a geometrical model of the knee joint after Total Knee Replacement with different axial alignments. The calculated stresses and displacements were significantly higher with varus knee malalignment than with the valgus one. The stresses are not high enough to pose a serious risk of a crack or a fracture but might be responsible for chronic pain reported by some patients. In cases where optimal implant positioning is not possible, slight valgus malalignment might produce better results than varus.