Wyniki wyszukiwania - BazTech

1

Koncepcja zrównoważonego rozwoju : perspektywa eko-energetyki

Sośnicki Marek, Wiśniewski Dawid

Wiedza Obronna

|

2023

|

nr 2

PL

W artykule przedstawiono wybrane kwestie aktualnie poruszane w zakresie ewaluacji koncepcji zrównoważonego rozwoju, warunkującej sekwencje ich cyklu życia. Polityka klimatyczno-energetyczna Unii Europejskiej jako inspiracja determinantów polityczno-społeczno-gospodarczych określa wpływ sektora energetycznego na ocenę cyklu życia koncepcji zrównoważonego rozwoju. Przeprowadzona w tym celu wielowymiarowa analiza potencjalnego wpływu, związanego z wyodrębnionymi etapami cyklu życia, przyjaznymi środowisku będzie wykorzystywana do opracowania oceny koncepcji zrównoważonego rozwoju. Zakres czasowy analizy wpływu obejmował okres od ostatniej dekady XX w. do dzisiaj. Celem artykułu jest zdefiniowanie ekoenergetyki w kontekście koncepcji zrównoważonego rozwoju mające pomóc w określeniu oddziaływania w/w determinantów, uczynienia jej atrakcyjniejszej wizerunkowo i przyczynienia się do ochrony naszej planety. Analizie poddano dane za lata 2020-2022.

EN

The article presents selected issues currently being addressed in the evaluation of sustainable development concepts, conditioning the sequences of their life cycle. The climate and energy policy of the European Union as an inspiration of political-socio-economic determinants determines the impact of the energy sector on the evaluation of the life cycle of the concept of sustainable development. The multidimensional analysis of the potential impact associated with the identified environmentally friendly life cycle stages conducted for this purpose will be used to develop an assessment of the concept of sustainable development. The temporal scope of the analysis covered the period from the last decade of the 20th century to today. The purpose of the article is to define eco-energy in the context of the concept of sustainable development to help determine the impact of the factors mentioned above, make it more attractive in terms of image and contribute to the protection of our planet.

2

Static and dynamic impact performance optimization of CFRP/Al bolt joint coupling structure-lay-up-connection parameters

Xu Wenchao, Wang Dengfeng

Archives of Civil and Mechanical Engineering

|

2022

|

Vol. 22, no. 3

art. no. e118

EN

Static shearing, drawing, and dynamic impact test schemes of carbon fber reinforced polymer (CFRP)/aluminum alloy (Al) bolt joint were designed. The fnite element model of the CFRP/Al bolt joint was established, and the failure modes of the joints under the static and dynamic impact conditions were analyzed. The structure, lay-up, and connection parameters of the joint were defned as design variables, and the static and dynamic impact performance indicators of the joint and the lay-up numbers of the CFRP sheet were defned as optimization objectives. Integrated multiobjective optimization was conducted for joints, employing the radial basis function neural network (RBFNN) surrogate model, elitist nondominated sorting genetic (NSGA-II) algorithm, and entropy-technique for order preference by similarity to ideal solution (E-TOPSIS) decision method. The best trade-of solution was obtained, and the optimal design variables were determined. The optimized joint was fabricated, and static and dynamic impact tests were carried out. The test and simulation results were compared to verify the efectiveness of simulation and optimization.

3

Analiza wpływu głębokiego wykopu na sąsiadujące z nim kamienice zabytkowe

Mitew-Czajewska Monika, Tomczak Urszula

Inżynieria i Budownictwo

|

2021

|

R. 77, nr 1-2

66--69

PL

Wykop znajduje się w centrum miasta i jest otoczony z trzech stron istniejącymi zabytkowymi kamienicami, a z czwartej graniczy z linią metra. Opisano wieloetapowe analizy MES, na których podstawie pod fundamentami kamienic zaprojektowano wzmocnienie gruntu. Przedstawiono i omówiono wyniki analiz wpływu realizacji wykopu na zabytkowe kamienice i porównano je z wynikami pomiarów przemieszczeń rzeczywistych.

EN

The deep excavation analyzed in the paper is located in the city center and is bounded on three sides by the existing historic tenement houses and on the fourth side by a subway line. The FEM analysis that has been made allowed for verifying the need to and the scope of using ground reinforcement under the foundations of old houses. The details on the theoretical and measured impact of the structure construction on the historic tenement houses is presented and discussed.

4

Analysis on two wheeler chassis frame of e-bike subjected to static and impact loads

Konada Naresh Kumar, Suman Koka Naga Sai

Journal of Mechanical and Energy Engineering

|

2020

|

Vol. 4, No 1

15--26

EN

The future of automotive industry is to design and develop electrical vehicles to control the emissions released from gaseous fuels and not to release any harmful gases in to atmosphere. In this work, an attempt was made to analyze the behavior of two wheeler E- bike with alternative materials of frame such as Aluminum alloy (Al-A), Titanium alloy (Ti-A), Grey cast iron (G-CI), Carbon fiber epoxy (CF-E), and Structural steel (ST-S) and compared with AISI-1020 material. The frame of Yamaha R15 is initially modeled by using solid work and imported to Ansys. Static analysis was performed by applying a load of 1500 N on the frame and Impact analysis was performed by applying velocity of 27.7 m/s along X direction. The values of equivalent von Mises stress and total deformation for all the materials are observed. After performing static analysis, it was observed that, CF- Epoxy material exhibited higher value of Equivalent von Mises stress (7.659*107 Pa) and lower total deformation of (0.304×10-6 mm) compared to remaining materials. Based on impact analysis , it was observed that, CF-E exhibited better von Mises stress of (3994.9 MPa) closer to AISI 1020 and structural steel materials and total deformation is observed to be lower value (0.1106 mm) compared to remaining materials.

5

Impact-based piezoelectric energy harvesting system excited from diesel engine suspension

Caban Jacek, Litak Grzegorz, Ambrożkiewicz Bartłomiej, Gardyński Leszek, Stączek Paweł, Wolszczak Piotr

Applied Computer Science

|

2020

|

Vol. 16, no 3

16--29

EN

Vibration energy harvesting systems are using real ambient sources of vibration excitation. In our paper, we study the dynamical voltage response of the piezoelectric vibrational energy harvesting system (PVEHs) with a mechanical resonator possessing an amplitude limiter. The PVEHs consist of the cantilever beam with a piezoelectric patch. The proposed system was subjected to the inertial excitation from the engine suspension. Impacts of the beam resonator are useful to increase of system’s frequency transition band. The suitable simulations of the resonator and piezoelectric transducer are performed by using measured signal from the engine suspension. Voltage outputs of linear (without amplitude limiter) and nonlinear harvesters were compared indicating better efficiency of the nonlinear design.

6

Structural assessment of the hull response of an fpso unit to dropped objects: a case study

Ozguc Ozgur

Polish Maritime Research

|

2019

|

nr 4

39--46

EN

Offshore structures are exposed to the risk of damage caused by various types of extreme and accidental events, such as fire, explosion, collision, and dropped objects. These events cause structural damage in the impact area, including yielding of materials, local buckling, and in some cases local failure and penetration. The structural response of an FPSO hull subjected to events involving dropped objects is investigated in this study, and non-linear finite element analyses are carried out using an explicit dynamic code written LS-DYNA software. The scenarios involving dropped objects are based on the impact from the fall of a container and rigid mechanical equipment. Impact analyses of the dropped objects demonstrated that even though some structural members were permanently deformed by drop loads, no failure took place in accordance with the plastic strain criteria, as per NORSOK standards. The findings and insights derived from the present study may be informative in the safe design of floating offshore structures.

7

Badania ścian z ABK w skali naturalnej poddanych ściskaniu – analiza strefy wokół okna. Cz.1

Drobiec Ł.

Materiały Budowlane

|

2018

|

nr 9

75--77

PL

W artykule zamieszczono rezultaty badań ścian z autoklawizowanego betonu komórkowego (ABK) w skali naturalnej. Ściany wzniesiono z bloczków o grubości 18 cm na cienkie spoiny. Badano ściany zbrojone i niezbrojone. Jako zbrojenie zastosowano siatki bazaltowe oraz typowe zbrojenie stalowe w postaci kratowniczki. Ściany poddano obciążeniom ściskającym. Obciążenie przykładano przez żelbetową belkę imitującą wieniec. Analizowano wpływ otworu na zachowanie się ścian zbrojonych i niezbrojonych. Wykazano, że zbrojenie ma istotny wpływ na ich nośność. W artykule opisano modele badawcze i stanowisko do badań. Natomiast w jego części drugiej, która ukaże się w następnym wydaniu, opublikowane zostaną wyniki badań.

EN

The paper describes the results of testing Autoclaved Aerated Concrete (AAC) walls on a full scale. The walls were made of 18 cm wide blocks and thin layer joints. Reinforced and non reinforced walls were tested. Basalt grids and typical steel reinforcement (truss type) were used as reinforcements. The walls were subjected to compressive loads. The load was applied by a reinforced concrete rim beam. The impact of the opening (window) on stress distribution and the load capacity of the wall was analysed. It was shown that reinforcement has a significant impact on the load-bearing capacity of the walls. The first part of the article describes research models and test stand. The second part will included research results.

8

Analiza wpływu rozwoju elektromobilności na zużycie energii elektrycznej w Polsce

Krupa K., Kamiński J.

Rynek Energii

|

2017

|

Nr 6

8--13

PL

Światowy rozwój przemysłu motoryzacyjnego w obszarze samochodów elektrycznych charakteryzuje się imponującą dynamiką, co w oczywisty sposób rodzi pytanie o przyszłość tego sektora oraz branż z nim powiązanych. Większość prognoz opracowanych przez globalne centra analityczne (IAE, BP, EIA) wskazuje na znaczący wzrost udziału samochodów elektrycznych w rynku. Rozwój rynku samochodów elektrycznych w naturalny sposób prowadzi do pytania o wpływ elektromobilności na zużycie energii elektrycznej. Wykonanie tego rodzaju analizy dla warunków krajowych wydaje się tym bardziej zasadne, że elektromobilność wciąż znajduje się w początkowej fazie rozwoju. Według szacunków, na koniec 2016 roku w Polsce flota samochodów elektrycznych obejmowała ok. 856 pojazdów. Przeprowadzona dla 2025 roku analiza wskazuje, że wartość oczekiwana zużycia energii elektrycznej wynikającego z rozwoju elektromobilności w Polsce to ok. 1,33 TWh w skali roku, co stanowi ok. 0,8% krajowego zużycia energii elektrycznej za 2016 rok. Wzrost zużycia energii elektrycznej spowodowany rozwojem elektromobilności w Polsce nie powinien (nawet w przypadku skrajnych scenariuszy) przekroczyć wartości ok. 3,27 TWh/rok w 2025 r. (ok. 2,0% krajowego zużycia energii elektrycznej w Polsce za 2016 r.), natomiast wartość wyższa jest mało prawdopodobna. Biorąc pod uwagę początkowe stadium rozwoju elektromobilności w Polsce oraz brak kompleksowych analiz wpływu przedmiotowego zjawiska na sektor elektroenergetyczny, wykonane badanie uznać można za pionierską w skali kraju próbę estymacji wpływu elektromobilności na poziom zużycia energii elektrycznej.

EN

Global development in the field of electric mobility (e-mobility) demonstrates impressive dynamics, which raises natural questions as to the future of this sector and adjacent industries. Most forecasts by global analytical institutions (IEA, BP, EIA) anticipate a material increase of electric vehicles’ market share. Such course of events is a natural reason why the future development of e-mobility ought to be investigated with regard for its influence on consump-tion of electric energy. Performing such analyses for domestic markets seems all the more rational that e-mobility can still be considered to be in its infancy. According to estimates as at end of 2016, the number of passenger electric vehicles in Poland was ca. 856. Results of the subject matter study for 2025 indicate that the expected volume of electricity consumption resulting from developing e-mobility in Poland is ca. 1.33 TWh at an annual scale, being roughly 0.8% of the country’s electricity consumption in 2016. Increase in Poland’s electricity consumption attributable to developments in electric mobility should not exceed - even for extreme cases - ca. 3.27 TWh/a in 2025 (ca. 2.0% of Poland’s electricity consumption in 2016), while results above that level are less probable. Given the initial stage of electric mobility development in Poland and a lack of comprehensive studies of impacts of the phenomenon on the power sector, the subject matter analysis may be deemed a pioneering attempt at a national level to estimate the influence of e-mobility on Poland’s electricity consumption.

9

Dynamical analysis of a constrained flexible extensible link with rigid support and clearance

Dupac M

Journal of Theoretical and Applied Mechanics

|

2014

|

Vol. 52 nr 3

665--676

EN

Dynamic response of robotic systems is affected by deformation of their flexible components, velocity and mass of the systems, as well as by the presence of clearance or impact between the components. Since accurate simulations of such robotic systems are increasingly important, the modelling and dynamical behaviour of an extensible mechanism with a rigid crank and a flexible link is investigated in this paper. The equations of motion of the extensible flexible link, constrained to a circular, Cartesian, elliptical, Cassinian, Lame or pear-shaped quartic path, are presented. A dynamical analysis is carried out in order to compare the dynamical response of the flexible link vs. a rigid link under the combined effect of different parameters such as flexibility and clearance. The simulation result shows clear trajectories divergence due to the impact effect of the flexible link on the rigid crank.

10

Numerical analysis of impact load of arch yielding support

Tokarczyk J., Turewicz K., Smolnik G., Rotkegel M.

Journal of KONES

|

2010

|

Vol. 17, No. 1

455-464

EN

Bumping is one of the natural hazards that occur in Polish collieries. It is a common phenomenon but difficult to predict and very often it causes huge losses in mining equipment and roadway structure. Death of miners working underground is most severe result of bumping. To reduce or even to eliminate results of bumping, especially fatal cases, many safety measures have been used. Frame of arch support is one of the measures applied to reduce dangerous results of bumping. Simulation test ofimpact load of arch yielding support was presented in the paper. The simulation of support load was realized in two stages. Static load of frame of yielding arch support was simulated at the first stage. Among others simulation of assembly of arch support components was carried out. Non-linear simulation, including contact phenomena, was conducted for that purpose. First stage of the task was realized in MSC.Marc/Mentat software Structure of yielding arch support was dynamically loaded at the second stage. The forcing corresponded to real dynamic loads that werefound in mine workings. Second stage of the task was realized in MSC.Dytran software The results of simulations carried out at the KOMAG Institute of Mining Technology were compared with the results of tests of arch supports, which were realized at the Central Mining Institute.