Temat: smart materials - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Influence of Terfenol-D powder volume fraction in epoxy matirx composites on their magnetomechanical properies
Autorzy:: Mech, R.
Kaleta, J.
Tematy:: magnetostriction
magnetic properties
smart materials
active materials; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/387154.pdf Link otwiera się w nowym oknie
Opis:: In this paper the investigations of magnetostriction as well as DC magnetic properties for composites doped with Terfenol-D particles are presented. All investigations were performed for the materials with 35%, 46% and 70% volume fraction of the Terfenol-D particles surrounded by epoxy matrix. Moreover, the bulk Terfenol-D alloy was tested. The obtained results show that the magnetization of the composite materials increases with increasing the volume fraction of Terfenol-D particles. Similar dependence as for magnetization was observed for the magnetostriction measurements. Although the magnetostriction of composite material is smaller than for solid Terfenol-D it is still tens of times bigger than in case of traditional magnetostrictive materials. Obtained results gives opportunity to use these materials for variety applications such as actuators and sensors.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Investigations of applications of smart materials and methods in fluid valves and drives
Autorzy:: Milecki, Andrzej
Rybarczyk, Dominik
Tematy:: electrohydraulics
valve
drive
smart materials; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/100208.pdf Link otwiera się w nowym oknie
Opis:: In the paper the investigations performed at the Division of Mechtronic Devices at Poznan University of Technology in the area of application of both: smart materials in electro-hydraulic and electro-pneumatic valves, and new methods to control of hydraulic servo drives, are presented. In a first part the piezo bender actuator is shortly described and its application in servo valve is proposed. This actuator replaced the torque motor in the available on the market servo valve. The new valve simulation model is proposed. The simulation and investigations results of the servo valve with the piezo bending actuator are included. In the next part of the paper the application of piezo tube actuator in flapper-nozzle pneumatic valve is described. The test stand and investigations results are presented. Later, in the article, the Model Following Control (MFC) and Fractional order Control (FoC) methods are described. Their application in control of electrohydraulic servo drive is proposed. Some investigations results are included in the paper, showing the advantages of those control methods.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Exploring inorganic–organic hybrids : poly(meth)acrylate-polydimethylsiloxane copolymers synthesis in mild conditions
Autorzy:: Wolski, Karol
Cieślik, Anna
Chmielarz, Paweł
Raczkowska, Joanna
Siewierska, Kinga
Opis:: Highly economical and environmentally friendly synthesis of a wide range of hydrophobic and hydrophilic poly(meth)acrylates with a low dispersity of D̵ < 1.3 and an initiation efficiency close to 100% by means of atom transfer radical polymerization (ATRP) is reported. This was possible thanks to the use of 2-propanol, which creates a versatile reaction medium that allows polymerization of monomers showing different hydrophilicities. The developed procedures of polymerization, utilizing metallic copper, ascorbic acid, or tertiary amine groups of monomers in the role of reducing agents, were furthermore applied in synthesis of triblock copolymers (TBC) grafted from the polydimethylsiloxane (PDMS) bifunctional, linear macroinitiator. This way, a series of amphiphilic macromolecules with various PDMS contents, including functional, pH-sensitive, and thermosensitive copolymers, were synthesized and characterized using proton and carbon-13 nuclear magnetic resonance (1H NMR, 13C NMR) and attenuated total reflectance infrared (ATR-IR) spectroscopies. The presence of the flexible PDMS core and hydroxyl groups in the outer blocks further enabled the preparation of copolymers with a complex structure of bottlebrushes with spherical topology, which were visualized using atom force microscopy (AFM). Biocompatibility of the obtained PDMS-based materials was evaluated with lactate dehydrogenase (LDH) cytotoxicity assay toward human dermal fibroblasts (HDF) and retinal pigment epithelium cells (RPE), which demonstrated over 85% cell viability after 7 days of incubation.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Generating of electricity from magnetoelectric composite with use of changes in direction of magnetic field vector
Autorzy:: Mech, R.
Tematy:: SMART materials
Energy Harvesting
magnetostriction
active materials
Terfenol-D; Pokaż więcej
Wydawca:: Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Powiązania:: https://bibliotekanauki.pl/articles/347476.pdf Link otwiera się w nowym oknie
Opis:: Paper shows study on the magnetoelectric composite material placed in an external magnetic field with changing magnetic field vecotr. An experimental setup for investigation of magnetoelectric properties of magnetostrictive-piezoelectric material was prepared. The hybrid structure is made of magnetostrictive composite (based on Terfenol-D) and piezoelectric material. Experimental results shown the response of prepared hybrid material to the rate of changes of direction of magnetic field vector. Investigation were mainly focused on possibility of generating of electric power from prepared material. It was found that the prepared hybrid material exhibits magnetoelectric effect in the case of work when direction of magnetic field vector was changing. This effect might be use in Energy Harvesting applications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modeling of shape memory alloy springs using a recurrent neural network
Autorzy:: Kardan, I
Abiri, R.
Kabganian, M.
Vahabi, M.
Tematy:: artificial neural networks
smart materials
shape memory alloy springs; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279784.pdf Link otwiera się w nowym oknie
Opis:: In this paper, a recurrent neural network structure is proposed for the modeling of the behavior of shape memory alloy springs. Numerous mathematical modeling and experimental evaluations show that the force exerted by SMAs, aside from their length and applied voltages, depends on the loading path. Therefore, in addition to the applied voltage and deformation, a feedback of the voltage applied to, and the force exerted by the SMA spring in the previous time step is included in the inputs to this neural network to represent the loading path. Fed by adequate inputs, the NN estimates the output force of the spring. The results of some thermal loadings of the spring at various fixed lengths and mechanical loadings at various constant voltages are used to train the NN. The performance of the NN model is then evaluated for some constant weight loadings which are not learnt by the NN. Simulation results indicate that compared to other neural network structures, the proposed structure learns the behavior of the SMA spring faster (in less iteration). Moreover, it provides a more general model, i.e. this NN model effectively estimates the output force for almost all possible loadings.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Vibration analysis for vehicle with vacuum packed particles suspension
Autorzy:: Makowski, M.
Zalewski, R.
Tematy:: Vacuum Packed Particles
vibration damping
semi-active
smart materials; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/282085.pdf Link otwiera się w nowym oknie
Opis:: The paper concerns an effect of the damping force controlling a vehicle suspension system. The investigated vehicle suspension system consists of innovatory Vacuum Packed Particles controllable dampers which allow controlling the vehicle body vibration. The main objective of performed and presented in the paper studies is to determine properties of the Vacuum Packed Particles (VPP) damper and propose a preliminary control strategy. The control in the vehicle suspension system can be realized by controlling the underpressure resulting in various jamming mechanisms in the granular core. Some algorithms of vibration control are also proposed and discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Influence of cobalt admixture on the microstructure and dielectric properties of PFN ceramics
Wpływ domieszki kobaltu na mikrostrukturę i dielektryczne właściwosci ceramiki PFN
Autorzy:: Bochenek, D.
Grabowski, F.
Niemiec, P.
Tematy:: materiały inteligentne
PFN
multiferroics
smart materials
ferroelectromagnetics
PFN ceramics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352912.pdf Link otwiera się w nowym oknie
Opis:: Within our work a ceramic of the PFN type was obtained by a single stage method and it was subjected to a cobalt modification in the amount of: 1.0, 2.0, 3.0, 4.0 and 6.0 mol%. Studies of the influence of the cobalt admixture on the crystalline structure, microstructure and ferroelectric properties of PFN ceramics were performed. It was shown that the iso-valence PFN admixing with cobalt had a positive influence on the density and ceramic microstructure. Higher cobalt admixtures (above 1.0 mol%) in PFN eliminate pyrochlore phase formation, and at the same time they reduce maximum electric permittivity values. The ferroelectric to paraelectric phase transition in the modified PFN compositions undergoes diffusion.
W pracy otrzymano ceramikę typu PFN metodą jednoetapowej syntezy, modyfikowaną kobaltem w ilości: 1,0, 2,0, 3,0, 4,0 i 6,0% mol. Przeprowadzono badania wpływu domieszki kobaltu na strukturę krystaliczna, mikrostrukture i podstawowe właściwości ceramiki typu PFN. Wykazano, że izowalencyjne domieszkowanie PFN kobaltem wpływa pozytywnie na gęstość i mikrostrukturę ceramiki. Większe ilości domieszki kobaltu (pow. 1,0%mol) w PFN eliminują powstawanie fazy pirochlorowej, a jednocześnie zmniejszają wartości maksymalnej przenikalności elektrycznej. Przemiana fazowa z ferroelektrycznej do paraelektrycznej fazy, w modyfikowanych składach PFN, ulega rozmyciu.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Smart materials as modern engineering substances
Autorzy:: Ćwikła, A.
Tematy:: smart materials
piezoceramics
shape memory alloys
aviation
medicine; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102897.pdf Link otwiera się w nowym oknie
Opis:: The article presents the type and use of intelligent materials in aviation and medicine. Their basic features and properties have been discussed. Moreover, the authors quote examples of different uses of intelligent materials, both the existing ones and those in design and development stages. Their use is claimed to be increasing the efficiency and reliability of processes and equipment as well as facilitates the development of new mechanisms.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The Study of Behavior of Vibrating Systems Controllable by Devices with Rheological Fluid
Autorzy:: Szary, M. L.
Weber, P.
Tematy:: noise control
vibration control
smart materials
rheological fluids; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177066.pdf Link otwiera się w nowym oknie
Opis:: The nonlinear mathematical model of behavior of controllable viscosity fluid (CVF) under applied external field is presented. A large family of these fluids is commonly used to control responding forces of dampers in vibration control applications. The responding force of a damper with CVF has two components. The first one - uncontrollable - is proportional to the viscosity of a base fluid and velocity of its motion, the second one, which is controllable, depends on the strength of the applied external field. Both are involved in the process of dissipation of unwanted energy from the vibrating systems. An equivalent damping factor based on the principle of energy dissipated during one cycle of damper work under a constant strength external field was calculated. When mass or stiffness is variable the equivalent damping factor can be set accordingly by adjusting the strength of external field to have vibrating damped system purposely/continuously working in the critical or other chosen state. This paper also presents cases of applying periodically changing strengths of an external field synchronized with cycles of periodical motion of the vibrating system to continuously control the damping force within each cycle.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Concept of an adaptive-tuned particles impact damper
Autorzy:: Żurawski, Mateusz
Zalewski, Robert
Chiliński, Bogumił Daniel
Tematy:: particles impact damper
adaptive-passive damping
smart materials
granular materials; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/2055066.pdf Link otwiera się w nowym oknie
Opis:: The most popular devices for attenuation of mechanical vibrations are dampers or shock absorbers. Two main energy dissipation strategies can be generally distinguished: passive and active (semi-active). Passive vibration isolation methods are the most commonly used, mainly because of their simplicity and low maintenance costs. Among passive vibration attenuation techniques, also Particle Impact Dampers (PID) are involved. Classical PID solutions have some certain limitations. This paper aims at presenting the new concept of an adaptive tuned PID damper that can pretend to be placed among semi-active energy dissipation methods.
Dostawca treści:: Biblioteka Nauki

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