Experimental investigation of very small low frequency transmitting antennas

2003 ◽  
Author(s):  
J.R. Moritz
Keyword(s):  
Experimental Investigation ◽  
Low Frequency

scholarly journals Mitigating Large Vibrations of Stayed Cables in Wind and Rain Hazards

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Hung Vo-Duy ◽  
Cung H. Nguyen
Keyword(s):  
Experimental Investigation ◽  
Wind Tunnel ◽  
Significant Role ◽  
Low Frequency ◽  
Vortex Flows ◽  
Complex Mechanism ◽  
High Wind ◽  
Wind Speeds ◽  
Cable Vibrations

This paper presents an experimental investigation of stayed cable vibrations in dry-wind and rain-wind coupling hazards. To mitigate large vibrations of the cable, the use of spiral wires wrapped around the cable is proposed. By testing two cable models in a wind tunnel in dry and rain conditions for different yaw angles and wind speeds, the effectiveness of using the spiral wires to mitigate large vibrations is clarified. Finally, the paper provides a further understanding of the complex mechanism of wind-induced and rain-wind-induced vibrations. It is found that the low-frequency vortex flows in the wake play a significant role in the excitation of large responses of the cable in high wind speeds. The spiral wires dismiss these low-frequency flows and then reduce the large vibrations.

Experimental investigation of theoretical stability regions for ultra-low frequency oscillations of hydropower generating systems

Energy ◽  
2019 ◽  
Vol 186 ◽  
pp. 115816 ◽  
Author(s):  
Weijia Yang ◽  
Jiandong Yang ◽  
Wei Zeng ◽  
Renbo Tang ◽  
Liangyu Hou ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Low Frequency ◽  
Stability Regions ◽  
Low Frequency Oscillations

scholarly journals Experimental Investigation and Statistical Analysis of Low Frequency RFID System

2021 ◽  
Author(s):  
Shilpa Choudhary ◽  
◽  
Abhishek Sharma ◽  
Arpana Mishra ◽  
◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Statistical Analysis ◽  
Layer Thickness ◽  
Sandy Soil ◽  
Soil Layer ◽  
Low Frequency ◽  
Atmospheric Conditions ◽  
Asset Tracking ◽  
Rfid System ◽  
Read Range

In today’s era RFID system plays a key role in the field of asset tracking but its maximum read range or detectability may get degraded due to the challenges which are being provided by varying atmospheric conditions. So, to study the effect of these challenging atmospheric conditions, experimental investigation and statistical analysis of RFID system detectability has been carried out. Varying surrounding temperature, humidity and the presence of soil layer thickness in between RFID reader and tag and its five different grain sizes were considered as input parameters. All these observations were carried out for three different soils i.e. sandy soil, Silt and clay. Execution of test was carried out according to the MINITAB 17 tool. According to ANOVA analysis as well as from interaction plot it was found that soil layer thickness have more impact on RFID system read range and R2 value was found to be 96.91%, 99.64% and 99.78% for RRSS, RRS and RRC respectively. Composite desirability of optimization was found to be 0.8425. Optimum values of process parameters Temperature, Soil Layer Thickness, Relative Humidity and Soil Grain Size were found to be 303.3°K, 2.5 cm, 40.1 %, 1.92 mm respectively. Best values of responses were found to be 10.94 cm for (Read Range in presence of Clay); 11.02 cm (Read Range in presence of Silt) and 10.97 cm (Read Range in presence of Sandy Soil).

Experimental investigation on the penetration characteristics of low-frequency impact of pulsed water jet

Wear ◽  
2021 ◽  
pp. 204145
Author(s):  
Zu’an Wang ◽  
Yong Kang ◽  
Fuqi Xie ◽  
Hanqing Shi ◽  
Ni Wu ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Low Frequency ◽  
Water Jet ◽  
Pulsed Water Jet

Experimental Investigation of Oscillation Controlled Heat Transport Tubes

2015 ◽  
Author(s):  
Omer F. Guler ◽  
Murat K. Aktas
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Pipe Flow ◽  
Thermal Transport ◽  
Low Frequency ◽  
Maximum Displacement ◽  
Vibration Displacement ◽  
Oscillatory Flows ◽  
Pure Diffusion ◽  
Experimental Apparatus

The oscillatory flows are widely used to enhance heat transfer or as an alternative cooling technique. The oscillatory flows in liquids have the potential of augmenting heat transfer as demonstrated in literature. The subject needs to be investigated in order to fully understand the thermal transport mechanism and affecting parameters. In this investigation, heat transfer in an oscillatory pipe flow of water was studied, experimentally for low frequency regime flow conditions. Major research tasks are; setting up of the experimental apparatus, parametric experimental investigation of the convective heat transfer in oscillatory pipe flow and data reduction and analysis. An experimental apparatus was designed and constructed for the experimental investigation. The equipment consist a capillary pipe bundle connecting a cold fluid and a hot fluid reservoir. The effects of the maximum displacement amplitude of the vibrations and vibration frequency on the heat transfer were analyzed with a parametric study. Significant effect of oscillatory flow on the thermal transport compare to pure diffusion was measured. The heat transfer is greatly enhanced as vibration displacement increase. The results of the present investigation will be useful in choosing optimum operation parameters for cooling applications utilizing oscillatory flows.

Experimental investigation of interaction of very low frequency electromagnetic waves with metallic nanostructure

2011 ◽  
Vol 109 (11) ◽  
pp. 114907
Author(s):  
Vijay Nalladega ◽  
Shamachary Sathish ◽  
Terry Murray ◽  
Eunsung Shin ◽  
Kumar V. Jata ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Electromagnetic Waves ◽  
Low Frequency ◽  
Metallic Nanostructure ◽  
Very Low Frequency
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