Intermittent swimming of two self-propelled flapping plates in tandem configuration

2022 ◽  
Vol 34 (1) ◽  
pp. 011905
Author(s):  
Linlin Kang ◽  
Xi-Yun Lu ◽  
Weicheng Cui
Keyword(s):  
Tandem Configuration

BLOCKAGE RATIO INFLUENCE ON FLOW OVER CYLINDERS WITH TANDEM CONFIGURATION L/D = 1.26

2020 ◽  
Author(s):  
Roberta Fatima Neumeister ◽  
Adriane Prisco Petry ◽  
Sergio Viçosa Möller
Keyword(s):  
Blockage Ratio ◽  
Tandem Configuration

Bistatic SAR Data Focusing Using a Frequency Scaling Algorithm Based on an Analytical Spectrum in Tandem Configuration

2011 ◽  
Vol 33 (6) ◽  
pp. 1447-1452
Author(s):  
Shi-chao Chen ◽  
Qi-song Wu ◽  
Ming Liu ◽  
Meng-dao Xing ◽  
Zheng Bao
Keyword(s):  
Frequency Scaling ◽  
Tandem Configuration ◽  
Bistatic Sar ◽  
Sar Data

scholarly journals Numerical Simulation and Hydrodynamic Performance Predicting of 2 Two-Dimensional Hydrofoils in Tandem Configuration

2021 ◽  
Vol 9 (5) ◽  
pp. 462
Author(s):  
Yuchen Shang ◽  
Juan J. Horrillo
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Resource Constraints ◽  
Lift Coefficient ◽  
Parametric Method ◽  
Experimental Results ◽  
Hydrodynamic Performance ◽  
Tandem Configuration ◽  
Artificial Neural Network Ann ◽  
Naca 0012

In this study we investigated the performance of NACA 0012 hydrofoils aligned in tandem using parametric method and Neural Networks. We use the 2D viscous numerical model (STAR-CCM+) to simulate the hydrofoil system. To validate the numerical model, we modeled a single NACA 0012 configuration and compared it to experimental results. Results are found in concordance with the published experimental results. Then two NACA 0012 hydrofoils in tandem configuration were studied in relation to 788 combinations of the following parameters: spacing between two hydrofoils, angle of attack (AOA) of upstream hydrofoil and AOA of downstream hydrofoil. The effects exerted by these three parameters on the hydrodynamic coefficients Lift coefficient (CL), Drag Coefficient (CD) and Lift-Drag Ratio (LDR), are consistent with the behavior of the system. To establish a control system for the hydrofoil craft, a timely analysis of the hydrodynamic system is needed due to the computational resource constraints, analysis of a large combination and time consuming of the three parameters established. To provide a broader and faster way to predict the hydrodynamic performance of two hydrofoils in tandem configuration, an optimal artificial neural network (ANN) was trained using the large combination of three parameters generated from the numerical simulations. Regression analysis of the output of ANN was performed, and the results are consistent with numerical simulation with a correlation coefficient greater than 99.99%. The optimized spacing of 6.6c are suggested where the system has the lowest CD while obtaining the highest CL and LDR. The formula of the ANN was then presented, providing a reliable predicting method of hydrofoils in tandem configuration.

scholarly journals Surface modification of AZ91 magnesium alloy using GTAW technology

2017 ◽  
Vol 65 (6) ◽  
pp. 917-926 ◽  
Author(s):  
J. Iwaszko ◽  
M. Strzelecka ◽  
K. Kudła
Keyword(s):  
Magnesium Alloy ◽  
Heat Source ◽  
Cooling System ◽  
Oxygen Affinity ◽  
Inert Gas ◽  
Surface Layers ◽  
Az91 Magnesium Alloy ◽  
Tandem Configuration ◽  
Welding Torch ◽  
Az91 Magnesium

AbstractIn this study, surface remelting treatment of the AZ91 magnesium alloy by means of welding using a non-consumable electrode in an inert gas shield was carried out. Three variants of surface treatment were used, i.e. the single torch variant with a single heat source without cooling down the samples, the single torch variant with a single heat source and a cooling system with liquid nitrogen, and the double welding torch variant with a double heat source in the torches operating in a tandem configuration. Experimental verification of the applied apparatus solutions was based on both macro- and microstructural assessment of the obtained effects. Comparative analysis of the variants used and the obtained microstructural results allowed the authors to indicate the deficiencies and limitations of particular solutions and to single out the best solution that would be useful for modifying the surface layers of magnesium alloys, as well as other materials having a strong oxygen affinity.

scholarly journals Optical optimization of double-side-textured monolithic perovskite–silicon tandem solar cells for improved light management

RSC Advances ◽  
2020 ◽  
Vol 10 (45) ◽  
pp. 26631-26638 ◽  
Author(s):  
Fazal E. Subhan ◽  
Aimal Daud Khan ◽  
Adnan Daud Khan ◽  
Najeeb Ullah ◽  
Muhammad Imran ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
High Power ◽  
Power Conversion ◽  
Silicon Solar Cells ◽  
High Power Conversion Efficiency ◽  
Tandem Solar Cells ◽  
Tandem Configuration ◽  
Light Management

Tandem configuration-containing perovskite and silicon solar cells are promising candidates for realizing a high power conversion efficiency of 30% at reasonable costs.

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