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Wyświetlanie 1-15 z 68
Tytuł:
Energy absorbing effectiveness – different approaches
Autorzy:
Kotełko, M.
Jankowski, J.
Ferdynus, M.
Powiązania:
https://bibliotekanauki.pl/articles/387477.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
thin-walled structure
energy absorber
impact
absorbing effectiveness
Opis:
In the paper the study of different crashworthiness indicators used to evaluate energy absorbing effectiveness of thin-walled energy absorbers is presented. Several different indicators are used to assess an effectiveness of two types of absorbing structures, namely thin-walled prismatic column with flaws and thin-walled prismatic frustum (hollow or foam filled) in both cases subjected to axial compressive impact load. The indicators are calculated for different materials and different geometrical parameters. The problem of selection of the most appropriate and general indicators is discussed.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 1; 54-59
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of composite energy absorbing elements
Autorzy:
Niezgoda, T.
Barnat, W.
Kiczko, A.
Powiązania:
https://bibliotekanauki.pl/articles/243633.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
impact test
FEM simulation
passive safety
composite structure
energy absorbing materials
Opis:
In this work the problem connected with an improvement of the road safety through implementation of additional elements absorbing the hitting energy is taken into consideration. The experimental results of a basic absorbing element of the glass epoxy composite are presented. The results of these tests will serve for the construction of a reliable numerical model of a panel of protective elements. The coincidence between the experimental and numerical results is also proved, showing that introduced approach to the modelling of the process of the progressive destruction and the energy absorption by composite elements is not only properly assumed but is very promising for the future. Efforts, which lead to increase the amount of absorbed energy need actions, directed to improving absorbing energy properties of used elements. Therefore, the received results will serve as guidelines for elaboration the methodology of the research structures of that type and also could be used in further research works within the scope of increasing the road security. In the article it is also proved that there is the necessity to conduct the series of comparative experiments and also tests verifying numerical studies at loading speeds, which can be compared with ones in reality, e.g. crash test or shock wave of an explosion. The validated, in such way, method of numerical simulations enables the limitation of costly and long-lasting research of real objects.
Źródło:
Journal of KONES; 2008, 15, 3; 405-409
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental support for numerical simulations of energy absorbing structures
Autorzy:
Ochelski, S.
Gotowicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/243303.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
polymer composites
energy absorbing structures
sandwich structures
specific energy absorption
experimental methods
Opis:
This paper presents experimental investigations of mechanical properties of materials used in the absorbing energy structures. Numerous experimental investigations are essential to develop a reliable numerical model of composite structures absorbing the impact energy. This model should correctly describe the dissipation of kinetic impact energy in the progressive crush process. Mechanical properties of composite materials like elastic modulus, strength, failure strains with influence of anisotropic properties are obtained experimentally. Different strength hypotheses are used for fibrous composites. The investigations on the complex stress state allow determining which of these theories describes the composite best. It was proved that both the matrix type and the structure of the composite have a very large influence on the SEA (Specific Energy Absorption), in particular on their crack propagation resistance. The dependence between the energy absorbed by a single energy absorbing element and a fragment of the structure absorbing the impact energy was discussed. Friction forces play the important role in the progressive crush of composites and they should be taken into account in developing a valid numerical model. Some authors state that the friction forces absorb 40% of the impact energy. The influence of failure strain rates on the absorbing energy capability, which is not clearly defined in the literature about composite structures, was also discussed.
Źródło:
Journal of KONES; 2008, 15, 1; 183-217
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound-Absorbing and Insulating Enclosures for Ultrasonic Range
Autorzy:
Dobrucki, A.
Żółtogórski, B.
Pruchnicki, P.
Bolejko, R.
Powiązania:
https://bibliotekanauki.pl/articles/178036.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic noise
sound absorbing and insulating enclosure
welder
Opis:
The physical phenomena occurring in sound-absorbing and insulating enclosures are subject of the present paper. These phenomena are: absorption in air and by the sound-absorbing material covering the walls and the coincidence effect. The absorption in the air can be neglected in small size enclosures for low ultrasonic frequencies (20–30 kHz). The coincidence plays a role in decrease of the sound insulation, however the main role play the leaks. The boards made of ceramic fibers have been chosen as the optimal sound-absorbing material. They are dense and have deeply porous structures. The enclosure for insulation of 20-kHz noise produced by a welding machine has been designed and manufactured, and reductions of 25 dB of peak and Leq levels have been achieved.
Źródło:
Archives of Acoustics; 2010, 35, 2; 157-164
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of progressive failure of composite energy absorbing structures
Autorzy:
Niezgoda, T.
Barnat, W.
Powiązania:
https://bibliotekanauki.pl/articles/243301.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport safety
road barriers
numerical analysis
energy-absorbing element
FEM
Opis:
The aim of the paper was to compare the influence of the applied fill on the energy absorbed by the energy ubsorbing structural elements made of composite, steel and from composite with fill foam. The experimental tests were carried out on an INSTRON universal testing machine at the speed rate of the machine's traverse equal 10 mm/min md the numerical analysis has been performed using MSC. Dytran software based on the Finite Element Method. The elements were subjected to axial kinematic loads. The higher specific absorbed energy occurs in the case of energy absorbing elements made of composites and from composite with fill foam. These elements can be applied in structures designed for the protection of people or limitation of the whole structure failure, e.g. in the case of a helicopter or car crash etc. The failure progressing in a relatively uniform manner results in the fact that the work md for failure of an energy absorbing element causes a substantial reduction of the impact load results. Application of energy absorbing elements may be a system dissipating the energy of a car impact into a crash barrier. The results of numerical simulation of stiffness plate hitting to the road barrier are presented. Experimental tests and numerical simulations were also presented for a composite sleeve subjected to progressive failure, which allowed carrying out simulation and analysis of a crash into a road barrier protected by a system of two such sleeves.
Źródło:
Journal of KONES; 2008, 15, 1; 169-181
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some results on 2-absorbing ideals in commutative semirings
Autorzy:
Kumar, P.
Dubey, M. K.
Sarohe, P.
Powiązania:
https://bibliotekanauki.pl/articles/357896.pdf
Data publikacji:
2015
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
semirings
ring theory
abstract algebra
subtractive ideal
2-absorbing ideal
weakly 2-absorbing ideal
subtractive extension of an ideal
Q-ideal
półpierścienie
teoria pierścieni
algebra abstrakcyjna
Opis:
In this paper, we study the concepts of 2-absorbing and weakly 2-absorbing ideals in a commutative semiring with non-zero identity which is a generalization of prime ideals of a commutative semiring and prove number of results related to the same. We also use these concepts to prove some results of Q-ideals in terms of subtractive extension of ideals in a commutative semiring.
Źródło:
Journal of Mathematics and Applications; 2015, 38; 77-84
1733-6775
2300-9926
Pojawia się w:
Journal of Mathematics and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On supportless absorbing convex subsets in normed spaces
Autorzy:
Fonf, V. P.
Powiązania:
https://bibliotekanauki.pl/articles/1292913.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
It is proved that a separable normed space contains a closed bounded convex symmetric absorbing supportless subset if and only if this space may be covered (in its completion) by the range of a nonisomorphic operator.
Źródło:
Studia Mathematica; 1993, 104, 3; 279-284
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sound absorbing materials from recycled rubber products
Materiały dźwiękochłonne z recyklingu wyrobów gumowych
Autorzy:
Turkiewicz, J.
Sikora, J.
Powiązania:
https://bibliotekanauki.pl/articles/973161.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sound absorption coefficient
sound absorbing materials
noise control
współczynnik pochłaniania dźwięku
materiały dźwiękochłonne
zwalczanie hałasu
Opis:
This paper concerns the results of comparative research into the acoustical properties of rubber granulates derived from the recycling of conveyor belts production waste. In the process of recycling it is possible to obtain pure granulated rubber and forms contaminated with cotton fibres with a predominance of rubber grains or of cotton fabric. Rubber granulate in the contaminated form is characterized by sound-absorbing properties similar to those of the average-quality mineral wool and other fibrous materials. It can be used as the core of sound-absorbing panels in anti-noise protections. The research results can be used both in the design of acoustical protection as well as in the course of the recycling process of other waste products for obtaining materials with sound absorbing properties.
W artykule przedstawiono wyniki badań porównawczych własności dźwiękochłonnych granulatu gumowego uzyskanego w wyniku recyklingu odpadów produkcyjnych taśm transporterowych. W procesie recyklingu można uzyskać czysty granulat gumowy oraz postacie zanieczyszczone włóknem bawełnianym z przewagą ziaren gumowych lub tkaniny bawełnianej.Granulat gumowy w postaci zanieczyszczonej charakteryzuje się własnościami dźwiękochłonnymi zbliżonymi do własności przeciętnej jakościowo wełny mineralnej i innych materiałów włóknistych. Może być stosowany jako rdzeń dźwiękochłonny w przegrodach warstwowych zabezpieczeń przeciwhałasowych. Przedstawione wyniki badań mogą być wykorzystane zarówno w projektowaniu zabezpieczeń akustycznych, jak i w procesie recyklingu innych zużytych wyrobów pod kątem uzyskiwania materiałów o właściwościach dźwiękochłonnych.
Źródło:
Mechanics and Control; 2013, 32, 3; 117-121
2083-6759
2300-7079
Pojawia się w:
Mechanics and Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of two alternative procedures for measuring airflow resistance of sound absorbing materials
Autorzy:
del Rey, R.
Alba, J.
Arenas, J. P.
Ramis, J.
Powiązania:
https://bibliotekanauki.pl/articles/176777.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
material characterization
airflow resistance
sound absorbing materials
eco-friendly material
Opis:
It is well known that sound absorption and sound transmission properties of open porous materials are highly dependent on their airflow resistance values. Low values of airflow resistance indicate little resistance for air streaming through the porous material and high values are a sign that most of the pores inside the material are closed. The laboratory procedures for measuring airflow resistance have been stan- dardized by several organizations, including ISO and ASTM for both alternate flow and continuous flow. However, practical implementation of these standardized methods could be both complex and expensive. In this work, two indirect alternative measurement procedures were compared against the alternate flow standardized technique. The techniques were tested using three families of eco-friendly sound absorbent materials: recycled polyurethane foams, coconut natural fibres, and recycled polyester fibres. It is found that the values of airflow resistance measured using both alternative methods are very similar. There is also a good correlation between the values obtained through alternative and standardized methods.
Źródło:
Archives of Acoustics; 2013, 38, 4; 547-554
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of sound absorbing properties of composite made of recycling materials
Autorzy:
Gaj, Patryk
Kopania, Joanna
Wójciak, Kamil
Bogusławski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/128049.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
sound absorbing materials
recycling
sound absorption coefficient
composite materials
materiały dźwiękochłonne
recykling
współczynnik pochłaniania dźwięku
materiały kompozytowe
Opis:
In modern world we are searching methods to reuse most of industrial disposals produced during manufacturing. Some kinds of materials, like scraps from acoustic foam, however are not so easily utilized using recycling methods for its primary usage. Disposals produced during the manufacturing process can be compressed and reused as sound absorbing material. The purpose of this article is to examine sound absorbing properties of material made of acoustic foam disposals and compare it with sound protection materials, which are commonly used. Sound absorbing damping were tested using Kundt’s tube and reverberation room examination method. Tests were carried out according to standard PN-EN ISO 354:2005, for reverberation room examination, and according to Bruel&Kjaer electronic instruments technical manual for Kundt’s tube examination.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-7
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of composite materials absorbing electromagnetic waves on the styrene-butadiene-styrene copolymer matrix with EMCCO-201 filler
Właściwości materiałów kompozytowych na bazie kopolimeru styren-butadien-styren napełnionego EMCCO-201 absorbujących fale elektromagnetyczne
Autorzy:
Vogt, Andrzej
Kaczmar, Jacek W.
Mayer, Paulina
Brzostek, Aleksandra
Nowosielski, Leszek
Przesmycki, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/945773.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
electromagnetic waves absorbing materials
absorption measurements
absorbing layers
materiały absorbujące fale elektromagnetyczne
pomiary absorpcji
warstwy absorbujące
Opis:
In this paper, a manufacturing method for composite materials that absorb electromagnetic waves in the form of blends of EMCCO-201 with SBS (styrene-butadiene-styrene copolymer, trade name Kraton) is shown and the absorption characteristics of the prepared samples are discussed. The materials were manufactured on the basis of extrusion technology. The absorption characteristics of the tested materials were measured as a function of the testing signal angles of incidence. The samples were 300 × 300 mm, made of aluminum alloy sheet and covered with either absorption elements that were spheroids of diameters 1–2 mm and 3–4 mm made of 50 vol. % of EMCCO-201 with SBS (styrenebutadienestyrene) copolymer or pyramids with a 25 × 25 mm base and height of 50 mm made of epoxy resin covered by spraying with a layer of EMCCO-201 material without SBS copolymer. Absorption measurements were carried out in the frequency range from 3.0 to 11.0 GHz. The largest absorption of 5.5–6.0 dB at the frequency range of 7.0–10.0 GHz was obtained for samples with the epoxy resin pyramids of a square base 25 × 25 mm and height of 50 mm covered with a layer of EMCCO-201 material. The samples with the spheroids showed smaller absorption between 1–3 dB at the same frequency range.
Przedstawiono metodę wytwarzania kompozytów absorbujących fale elektromagnetyczne w postaci mieszanek materiału absorbującego typu EMCCO-201 z kopolimerem SBS (styren-butadien-syren, nazwa handlowa Kraton). Materiały kompozytowe otrzymywano metodą wytłaczania. Charakterystykę absorpcji badanych materiałów wyznaczano przy użyciu próbek blachy o wymiarach 300 × 300 mm ze stopu aluminium, pokrytej elementami absorbującymi w postaci sferoidów wykonanych z kompozytu kopolimeru SBS zawierającego 50% obj. EMCCO-201, o średnicach 1–2 mm oraz 3–4mm, a także w postaci ostrosłupów charakteryzujących się podstawą o wymiarach 25 × 25 mm i wysokością 50 mm wykonanych z żywicy epoksydowej, pokrytych warstwą materiału EMCCO-201 bez kopolimeru SBS. Pomiary absorpcji fal elektromagnetycznych przeprowadzono w zakresie częstotliwości od 3.0 do 11.0 GHz. Największą absorbcją 5–6 dB w zakresie 7.0–10.0 GHz charakteryzowały się próbki z elementami tłumiącymi w kształcie ostrosłupów o podstawie kwadratowej 25 × 25 mm i wysokości 50 mm wykonanymi z żywicy epoksydowej i pokrytymi materiałem EMCCO-201. Próbki z elementami tłumiącymi w formie sferoidów charakteryzowały się małą absorbcją o wielkości 1–3 dB w analogicznym zakresie częstotliwości.
Źródło:
Polimery; 2020, 65, 7-8; 542-549
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructures and Microwave-Absorbing Properties of ZnO Smoke from Zinc Leach Residue Treated by Carbothermal Reduction
Autorzy:
Ma, Zhiwei
Wang, Sheng
Du, Xueyan
Zhang, Ji
Zhao, Ruifeng
Zhang, Shengquan
Powiązania:
https://bibliotekanauki.pl/articles/2049146.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zinc leach residue
carbothermal reduction
ZnO smoke
microwave-absorbing properties
Opis:
Much zinc residue is produced during the traditional processes involved in zinc hydrometallurgy in the leaching stage: its composition is complex and valuable metals are difficult to recover therefrom. If not handled properly, it can lead to a waste of resources and environmental pollution. To solve this problem, zinc leach residue specimens were treated using the carbothermal reduction method (CTR) that is easy to operate and has a high energy utilisation rate. The methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM) were used for analytical characterisation. Based on this, this research investigated a structure-function relationship between microstructures and microwave-absorbing properties of ZnO smoke from CTR-treated zinc leach residue. The results demonstrate that microstructures and macro-properties of ZnO smoke obtained at different temperatures differ greatly. Under conditions including a calcination temperature of 1250°C, holding time of 60 min, and addition of 50% and 10% of powdered coal and CaO separately, the ZnO content in the obtained smoke is 99.14%, with regular micron-sized ZnO particles therein. For these particles, the minimum reflection loss (RLmin) reached –25.56 dB at a frequency of 15.84 GHz with a matching thickness of 5 mm. Moreover, frequency bandwidth corresponding to RL < –10 dB can reach 2.0 GHz. ZnO smoke obtained using this method is found to have excellent microwave-absorbing performance, which provides a new idea for high-value applications of zinc-rich residue.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1163--1170
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of austenitic steels in energy absorbing structures
Autorzy:
Moćko, W.
Powiązania:
https://bibliotekanauki.pl/articles/246772.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aluminium alloys
CO2 emission
electric vehicle
vehicle structure
Opis:
Occupants protection during vehicle crash is one of the major problems considered at vehicle designing stage. The increasing safety as well as comfort requirements results in the total vehicle weight increase. On the other hand, higher mass influence on the fuel economy of vehicle. Thus, it is very important to maintain or even reduce vehicle weight. One of the solutions of this problem is application of a new materials having good strength-to-weight ratio i.e. high strength steels (HSS). They are often used in protective and energy absorbing structures in automotive industry. One of HSS so-called austenitic steels are characterized by excellent mechanical properties such as: high strength, strong strain, and strain rate hardening. Those mechanical effects are consequence of microstructural evolution during strong deformations i.e. twinning and phase transformation. As a consequence those steels are very good material for the purposes of energy absorbing and protective structures. This article presents the results of mechanical properties tests of VP159 austenitic steel. On the basis of experimental data, the JC constitutive model has been calibrated. The obtained results were used for the computer simulations of energy absorbing of square profiles made of analysed material. The results were compared with other types of steel.
Źródło:
Journal of KONES; 2012, 19, 3; 305-310
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the absorbing pervaporation technique for ammonia recovery after the haber process
Autorzy:
Atlaskin, A.
Petukhov, A. N.
Yanbikov, N. R.
Salnikova, M.E.
Sergeeva, M. S.
Vorotyntsev, V. M.
Vorotyntsev, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/184857.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas separation
absorbing pervaporation
ammonia
process intensification
membrane
separacja gazów
amoniak
intensyfikacja procesu
membrana
Opis:
A novel absorbing pervaporation hybrid technique has been evaluated experimentally for the recovery of ammonia from the gas mixture in a recycle loop of synthesis plants. This process of hybridization brings together the combination of energy-efficient membrane gas separation based on poly(dimethylsiloxane) poly(diphenylsilsesquioxane) with a high selective sorption technique where a water solution with polyethylene glycol 400 (PEG-400) was used as the liquid absorbent. Process efficiency was studied using the pure and mixed gases. The influence of PEG-400 content in aqueous solutions on process selectivity and separation efficiency was studied. The ammonia recovery efficiency evaluation of an absorbing pervaporation technique was performed and compared with the conventional membrane gas separation. It was shown that the absorbing pervaporation technique outperforms the conventional membrane method in the whole range of productivity, producing the ammonia with a purity of 99.93 vol.% using the PEG 80 wt.% solution. The proposed method may be considered as an attractive solution in the optimization of the Haber process.
Źródło:
Chemical and Process Engineering; 2018, 39, 3; 323--333
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency of anti-noise barriers in railway transport
Autorzy:
Hranický, M. P.
Kendra, M.
Skrúcaný, T.
Powiązania:
https://bibliotekanauki.pl/articles/134873.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
absorbing
noise
railway transport
train
wall
Opis:
This paper is focused on the comprehensive analysis of the railway noise issues. It deals with the influence of noise on the environment and presents the options how the noise from the railway transport might be reduced by noise barriers. In conclusion, the theoretical part is complemented by a practical one in the form of measuring and subsequent analysis.
Źródło:
Technical Issues; 2016, 3; 43-52
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
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