A method of analysis and design of linear high-order systems

1973 ◽  
Vol 43 (5) ◽  
pp. 329
Author(s):  
C.F. Ho
Keyword(s):  
High Order ◽  
Analysis And Design

Analysis and Design of Ultra-Wideband mm-Wave Injection-Locked Frequency Dividers Using Transformer-Based High-Order Resonators

2018 ◽  
Vol 53 (8) ◽  
pp. 2177-2189 ◽  
Author(s):  
Jingzhi Zhang ◽  
Yixuan Cheng ◽  
Chenxi Zhao ◽  
Yunqiu Wu ◽  
Kai Kang
Keyword(s):  
High Order ◽  
Ultra Wideband ◽  
Analysis And Design ◽  
Frequency Dividers

Theory, analysis and design of high order reflective, absorptive filters

2017 ◽  
Vol 11 (6) ◽  
pp. 787-795 ◽  
Author(s):  
Senad Bulja ◽  
Andrei Grebennikov ◽  
Pawel Rulikowski
Keyword(s):  
High Order ◽  
Theory Analysis ◽  
Analysis And Design

Analysis and design of high-order discontinuous systems

1966 ◽  
Vol 11 (3) ◽  
pp. 627-628
Author(s):  
K. Han ◽  
S. Yen ◽  
G. Thaler
Keyword(s):  
High Order ◽  
Discontinuous Systems ◽  
Analysis And Design

On the Effect of Inflow Disturbances on the Flow Past a Linear LPT Vane Using Spectral/hp Element Methods

2019 ◽  
Author(s):  
Andrea Cassinelli ◽  
Hui Xu ◽  
Francesco Montomoli ◽  
Paolo Adami ◽  
Raul Vazquez Diaz ◽  
...  
Keyword(s):  
High Performance ◽  
Leading Edge ◽  
High Order ◽  
Software Framework ◽  
Analysis Tool ◽  
Suction Surface ◽  
Present Contribution ◽  
Analysis And Design ◽  
Transition Mechanism ◽  
Moderate Reynolds Number

Abstract The recent development and increasing integration of high performance computing, scale resolving CFD and high order unstructured methods offers a potential opportunity to deliver a simulation-based capability (i.e. virtual) for aerodynamic research, analysis and design of industrial relevant problems in the near future. In particular, the tendency towards high order spectral/hp element methods is motivated by their desirable dispersion-diffusion properties, that are combined to accuracy and flexibility for complex geometries. Previous work from the Authors focused on developing guidelines for the use of these methods as a virtual cascade for turbomachinery applications. Building on such experiments, the present contribution analyzes the performance of a representative industrial cascade at moderate Reynolds number with various levels and types of inflow disturbances, adopting the incompressible Navier-Stokes solver implemented in the Nektar++ software framework. The introduction of a steady/unsteady spanwise-nonuniform momentum forcing in the leading edge region was tested, to break the flow symmetry upstream of the blade and investigate the change in transition mechanism in the aft portion of the suction surface. To provide a systematic synthetic turbulence generation tool, a parallelised version of Davidson’s method is incorporated and applied for the first time in the software framework to a low pressure turbine vane. The clean results of the cascade are compared to various levels of momentum forcing and inflow turbulence, looking at blade wall distributions, wake profiles and boundary layer parameters. Low levels of background disturbances are found to improve the agreement with experimental data. The results support the confidence for using high order spectral methods as a standalone performance analysis tool but, at the same time, underline the sensitivity at these flow regimes to disturbances or instabilities in the real environment when comparing to rig data.

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