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    Wyświetlanie 1-5 z 5
    Tytuł:
    Centrifugal compressor performance improvement through multi splitter impeller
    Autorzy:
    Malik, Adil
    Zheng, Qun
    Qureshi, Shafiq R.
    Ahmed, Salman A.
    Gambo, D. KB
    Powiązania:
    https://bibliotekanauki.pl/articles/258806.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    centrifugal compressor
    back swept impeller
    flow separation
    efficiency
    numerical simulation
    Opis:
    In the paper, a back swept impeller of centrifugal compressor is experimentally studied and numerically validated and modified to increase its pressure ratio and improve efficiency, as well as to analyse the effect of splitter blade location between two main blades. The back swept multi splitter blade impeller was designed with a big splitter positioned close to the main blade suction surface and a smaller splitter close to the pressure surface. Adding this multi splitter improves the overall performance of the modified impeller due to less intensive flow separation and smaller pressure loss. In particular, the total pressure ratio was observed to increase from 4.1 to 4.4, with one percent increase in efficiency.
    Źródło:
    Polish Maritime Research; 2019, 2; 6-14
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation analysis for the efficiency enhancement of Sb2S3 solar cell using SCAPS-1D
    Autorzy:
    Oglah, Mubarak Hamad
    Mahmood, Watban Ibrahim
    Adday, Nawras Basheer
    Powiązania:
    https://bibliotekanauki.pl/articles/29519763.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    numerical simulation
    efficiency
    solar cells
    Sb2 S3 compound
    SCAPS-1D
    Opis:
    The simulation analysis was performed to enhance the efficiency of Sb2 S3 solar cells using the SCAPS-1D software. The Sb2 S3 compound was used as the absorber layer in the solar cell. The simulation was conducted to verify the efficiency and accuracy of the results obtained from the program. The results were found to be in agreement with the practical results. The original cell’s efficiency was 11.47% with a fill factor of 61.18%, and after the simulation, the efficiency was found to be 11.43% with a fill factor of 61.2%. To enhance the efficiency of the solar cell, a reflective background layer (BSL) was added. Different BSL layers were examined, including SnS, Si, CIGS, CZTSSe, and CUS bS3 , and the best reflective layer was found to be CUSbS3 . The solar cell structure was designed as follows: glass/Mo/CUSbS3 /Sb2 S3 /CdS/i:ZnO/AL:ZnO. After adding the reflective layer, the efficiency of the solar cell was found to be 20.59% with a fill factor of 87.53%. The results suggest that adding reflective layers to solar cells can enhance their performance and increase their efficiency.
    Źródło:
    Computer Methods in Materials Science; 2023, 23, 4; 19-29
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrostatic microactuators for precise positioning and comparison of their parameters
    Autorzy:
    Štarman, V.
    Kacerovský, J.
    Jansa, J.
    Karban, P.
    Doležel, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/97343.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electrostatic microactuators
    force effects
    fully adaptive higher-order finite element method
    numerical analysis
    efficiency
    Opis:
    Comparison of several types of electrostatic microactuators is carried out, particularly with respect to their resultant force effects. The continuous mathematical model of such actuators is mostly described by the Laplace equation. In this paper, its numerical solution is performed by a fully adaptive higher-order finite element method, using a code developed by the authors. The methodology is illustrated with typical examples whose results are discussed.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 122-127
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy harvesting shock absorber with linear generator and mechanical motion amplification
    Autorzy:
    Satpute, Nitin
    Iwaniec, Marek
    Narina, Ramesh
    Satpute, Sarika
    Powiązania:
    https://bibliotekanauki.pl/articles/2146637.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    motion amplification
    electric power
    energy harvesting
    efficiency
    numerical simulation
    amplifikacja ruchu
    energia elektryczna
    harvesting energii
    wydajność
    symulacja numeryczna
    Opis:
    Energy harvesting shock absorbers can generate about 15-20 W of electric power for normal suspension velocities. However, higher weight, fail safe characteristics and space limitations have restricted development of regenerative shock absorbers to research prototypes. Power to weight ratio of regenerative shock absorbers can be improved by incorporating motion amplification. In the presented work, an innovative design of energy harvesting shock absorber has been presented that uses motion amplification for improving harvesting efficiency. Apart from improving electric power, the proposed solution is fail safe and can be easily incorporated in existing vehicles with only marginal change in suspension layout. Study includes detailed numerical analysis for vibration transmissibility to investigate comfort and safety. Further, a prototype has been fabricated and experimentation has been performed to compute electric power generated and comfort. Simulations have been performed on real size model with utilization of harvested electric power which indicates about 19% of overall harvesting efficiency.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 1; art. no. 2020104
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of mechanical motion amplification for vibration energy harvesting
    Autorzy:
    Satpute, Nitin
    Iwaniec, Marek
    Narina, Ramesh
    Satpute, Sarika
    Powiązania:
    https://bibliotekanauki.pl/articles/2146670.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    motion amplification
    electric power
    energy harvesting
    efficiency
    numerical simulation
    amplifikacja ruchu
    energia elektryczna
    harvesting energii
    efektywność
    symulacja numeryczna
    Opis:
    Vibration Energy Harvesting is being investigated for autonomous sensors and actuators that mainly utilize ambient and machine induced vibrations. Recently mechanical motion amplification is incorporated for improving power to weight ratio of vibration harvesters. The present study is motivated to investigate mechanical motion amplification characteristics with different configurations. The parameters investigated are motion amplification ratio, force transmissibility characteristics, weight of the electrical generator, effective damping coefficient achieved and linear nature of damping. Numerical analysis has been performed to compare important characteristics of device operating without amplification to that of with amplification with different configuration. The study has been concluded with comments on application of suitable type of amplification mechanism depending on weight/space constraints and desired effective damping coefficient.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 1; art. no. 2022113
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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