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Przegląd rozwiązań aktywnej kontroli drgań dla narzędzi skrawających

Kasprowiak M.

Stal, Metale & Nowe Technologie

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2018

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nr 3-4

18--23

PL

W artykule przedstawiono problematykę drgań występujących w trakcie obróbki skrawaniem, negatywne konsekwencje, jakie za sobą niosą, a także to, w jaki sposób wpływają na proces obróbki skrawaniem. Omówiono również nowoczesne materiały wykorzystywane w aplikacjach tłumiących drgania, niemniej jednak zasadniczą część publikacji stanowi przegląd opublikowanych rozwiązań konstrukcyjnych wspomagających walkę ze zjawiskiem drgań towarzyszącym procesowi skrawania.

EN

The paper presents the issue of vibrations during the machining process, negative consequences caused by them and how they influence the machining process. Moreover, smart materials used in vibration damping have been discussed. The main part of the paper describes a review of published solutions which support the fight with the vibration phenomenon during machining.

2

Polyimide Dielectric Layer on Filaments for Organic Field Effect Transistors: Choice of Solvent, Solution Composition and Dip-Coating Speed

Rambausek L., Bruneel E., De Mey G., Van Langenhove L.

Autex Research Journal

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2014

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Vol. 14, no. 3

121-134

EN

In today’s research, smart textiles is an established topic in both electronics and the textile fields. The concept of producing microelectronics directly on a textile substrate is not a mere idea anymore and several research institutes are working on its realisation. Microelectronics like organic field effect transistor (OFET) can be manufactured with a layered architecture. The production techniques used for this purpose can also be applied on textile substrates. Besides gate, active and contact layers, the isolating or dielectric layer is of high importance in the OFET architecture. Therefore, generating a high quality dielectric layer that is of low roughness and insulating at the same time is one of the fundamental requirements in building microelectronics on textile surfaces. To evaluate its potential, we have studied polyimide as a dielectric layer, dip-coated onto copper-coated polyester filaments. Accordingly, the copper-coated polyester filament was dip-coated from a polyimide solution with two different solvents, 1-methyl-2-pyrrolidone (NMP) and dimethylformaldehyde. A variety of dip-coating speeds, solution concentrations and solvent-solute combinations have been tested. Their effect on the quality of the layer was analysed through microscopy, leak current measurements and atomic force microscopy (AFM). Polyimide dip-coating with polyimide resin dissolved in NMP at a concentration of 15w% in combination with a dip-coating speed of 50 mm/min led to the best results in electrical insulation and roughness. By optimising the dielectric layer’s properties, the way is paved for applying the subsequent semi-conductive layer. In further research, we will be working with the organic semiconductor material TIPS-Pentacene.

3

Modelling coupled electric field and motion of beam of ionic polymer-metal composite

Dominik I., Kaszuba F., Kwaśniewski J.

Acta Mechanica et Automatica

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2014

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Vol. 8, no. 1

38--43

EN

In this paper, a mathematical model of electromechanical transduction of Ionic Polymer-Metal Composites is presented. The aim of the research was to create a physics-based, geometrically scalable model to use in control systems. The relation between actuating voltage and the tip displacement was described with a transfer function. The model is derived from the basic physical properties of re-searched materials. To calculate the final transfer function, two impedance models are considered – with and without neglecting the re-sistance of the metal electrodes. In this paper, the model with non-zero electrode resistance is calculated. Later, the model is simplified (taking the physical properties into account) and the numerical values based on the parameters of the samples are calculated. The simpli-fications allow the model to predict the response to low-frequency sine wave actuation. The frequency-domain characteristics of the sam-ples were created experimentally and compared to the model. The results have proven the accuracy of the model.

4

Developing fibrous multifunctional structures for technical applications

Araujo M., Fangueiro R., Geraldes M. J.

Autex Research Journal

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2005

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Vol. 5, no. 1

49--54

EN

This paper describes a quick prototyping unit for fibrous multifunctional structures which has been set-up at the University of Minho. This unit provides for fast development of technical samples for a variety of special applications, mainly in the areas of health and well-being, sports goods, personnel protection, techno-fashion, the civil construction and building industries, composite materials, and so on. The unit works systematically through the areas of conceptualisation, design and simulation, development, manufacturing and testing of technical and intelligent textile materials and structures, providing solutions for technical problems. New structures are developed for specific applications where special requirements are needed. It provides the best solution in terms of materials, structures, technologies and cost. The technologies involved include advanced CAD systems, FEA (finite element analyses), testing of mechanical properties, permeability, conductivity, microscopy, as well as small-scale-computer controlled manufacturing of yarns, nonwovens, wovens, warp & weft knits, braids and hybrid structures. Special finishings and surface treatments, coating and lamination are also possible. The unit is used for research, education and to provide services for companies in emerging markets for advanced textile materials. Examples of the novel products developed are provided.

5

Suppression of vibration of a clamped beam with embedded self-sensing piezoceramic actuator

Starek L., Solek P., Starekova A., Blesak P.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 8-9

22-24

EN

A performance study of a clamped beam with embedded self-sensing piezoceramic actuator will be presented. We will explore a problem in vibration suppress on for the free and forced vibration of the clamped beam. The both, the experimental implementation of the clamped beam with embedded self-sensing piezoceramic and the FEM model are developed and the comparison between experimental and simulation results for free and forced vibration is given.

PL

W artykule przedstawione zostaną badania dotyczące działania belki wspornikowej z wbudowanym inteligentnym siłownikiem piezoceramicznym. Przebadano problem tłumienia swobodnych i wymuszonych drgań belki. Opracowano zarówno doświadczalną realizację belki wspornikowej z wbudowanym inteligentnym siłownikiem piezoceramicznym jak i model MES. Na tej podstawie dokonano porównania pomiędzy wynikami uzyskanymi na drodze doświadczalnej a rezultatami symulacji w przypadku drgań swobodnych oraz wymuszonych.