Performance analysis of one dimensional radar imaging based on sparse and non-uniform frequency samplings

2012 ◽  
Author(s):  
Zhou Jianxiong ◽  
Zhao Hongzhong ◽  
Fu Qiang
Keyword(s):  
Performance Analysis ◽  
Radar Imaging ◽  
One Dimensional

Altitude Effects on the Performance of Small Radial Turbomachinery: Part I — Compressor Impellers

2016 ◽  
Author(s):  
Dries Verstraete ◽  
Kjersti Lunnan
Keyword(s):  
Reynolds Number ◽  
Performance Analysis ◽  
Rotational Speed ◽  
Pressure Ratio ◽  
Unmanned Aircraft ◽  
Good Match ◽  
One Dimensional ◽  
Design Changes ◽  
Current Article ◽  
The Impact

Small unmanned aircraft are currently limited to flight ceilings below 20,000 ft due to the lack of an appropriate propulsion system. One of the most critical technological hurdles for an increased flight ceiling of small platforms is the impact of reduced Reynolds number conditions at altitude on the performance of small radial turbomachinery. The current article investigates the influence of Reynolds number on the efficiency and pressure ratio of two small centrifugal compressor impellers using a one-dimensional meanline performance analysis code. The results show that the efficiency and pressure ratio of the 60 mm baseline compressor at the design rotational speed drops with 6–9% from sea-level to 70,000 ft. The impact on the smaller 20 mm compressor is slightly more pronounced and amounts to 6–10%. Off-design changes at low rotational speeds are significantly higher and can amount to up to 15%. Whereas existing correlations show a good match for the efficiency drop at the design rotational speed, they fail to predict efficiency changes with rotational speed. A modified version is therefore proposed.

Performance analysis of one dimensional BC 2 N for nanoelectronics applications

2018 ◽  
Vol 102 ◽  
pp. 33-38 ◽  
Author(s):  
Wei Hong Lim ◽  
Afiq Hamzah ◽  
Mohammad Taghi Ahmadi ◽  
Razali Ismail
Keyword(s):  
Performance Analysis ◽  
One Dimensional
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