Electromagnetic scattering from simple jet engine models

Anastassiu, H.T.; Volakis, John L.; Ross, D.C.; Andersh, Dennis

doi:10.1109/8.486313

Cited by 44 publications

(29 citation statements)

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“…This specific geometry has been studied using the MM techniques [2,15]. Measured data for this problem were originally presented in [15] and [16].…”

Section: Numerical Results Versus Measurementsmentioning

confidence: 99%

Computation of radar cross section of jet engine inlets

Liu¹,

Dunn²,

Baldensperger³

et al. 2002

Micro & Optical Tech Letters

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COMPUTATION OF RADAR CROSS SECTION OF JET ENGINE INLETSJianKey words: radar cross sections; finite element method; numerical method INTRODUCTIONElectromagnetic scattering from jet engine inlets is an important topic of research due to the significant contribution that the inlet has to the radar cross section (RCS) of modern aircraft. Many researchers have studied this topic using an assortment of different methods. Some techniques applied to the problem are standard methods, such as mode matching (MM) [1, 2], shooting and bouncing ray (SBR) [3, 4], as well as the finite element method (FEM) and method of moment (MoM) techniques [5,6]. It is known, however, that these standard methods have some serious drawbacks that prevent them from being fully used to compute the RCS for practical jet engine inlets. In the case of MM, the resulting system demonstrates slow convergence and requires a large number of modes as well as a poorly conditioned large matrix to invert. Furthermore, rigorous modal methods are only useful for simple geometries that can have canonical terminations [2]. The problems with SBR techniques are that, while they are simple and efficient, they lack the required accuracy to handle arbitrary complex structures. Standard FEM and MoM have trouble handling the entire structure due to its large size.More recently, hybrid methods have been introduced to solve this important problem. Some of them combine high-frequency techniques in the empty part of the inlet with numerical methods in the loaded section [7][8][9][10][11][12]. Despite the advantages of these methods, they still require a large number of degrees of freedom, which makes them very difficult to apply to large structures. Some researchers reduce this domain for the case of simple periodic geometries, but for arbitrarily shaped inlets these methods are still limited by their memory and CPU time requirements.A particular method that is very well suited to the computation of RCS of jet engine inlets is the finite element-boundary integral (FE-BI) method [13,14]. Since jet engine inlets are complex geometries that may have complex material composition, this is well suited for a finite element approach. The domain size is truncated with a boundary integral, which reduces the overall simulation domain. Furthermore, the techniques described in [13] and [14] exploit the structure of the FE-BI equations to require minimal memory (only proportional to the maximum cross section of the inlet and independent of its depth) and computation time, which increases linearly with respect to the inlet depth.In both [13] and [14], the FE-BI method was applied to empty cavities. Although the calculated results were compared extensively with the results obtained using other techniques, little comparison was given with measured data. In this article, we extend the FE-BI method to inlets with complex internal structures and present results applying this technique to some special engine cases described in the following section and compare the numerical results with measu...

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“…This specific geometry has been studied using the MM techniques [2,15]. Measured data for this problem were originally presented in [15] and [16].…”

Section: Numerical Results Versus Measurementsmentioning

confidence: 99%

Computation of radar cross section of jet engine inlets

Liu¹,

Dunn²,

Baldensperger³

et al. 2002

Micro & Optical Tech Letters

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“…1 is simulated and verified through comparison with other data [2,17]. The normalized mean square error (nMSE) is defined to examine the accuracy as (13).…”

Section: Numerical Resultsmentioning

confidence: 99%

A Novel Hybrid Aipo-Mom Technique for Jet Engine Modulation Analysis

Lim¹,

Myung²

2010

PIER

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Abstract-A novel hybrid adaptive iterative physical opticsmethod of moments (AIPO-MoM) technique is presented for the electromagnetic analysis of jet engine structures that are both electrically large and complex in both stationary and dynamic cases. In this technique, the AIPO method is used to analyze the smooth inlet region, and the MoM method is used to analyze the electrically complex compressor region, including blades and a hub. It is efficient and accurate by virtue of combining the respective merits of both methods. In the dynamic case, a concept for modified impedance equation is proposed to reduce computational load. Numerical results are presented and verified through comparison with Mode-FDTD and measured and commercial simulation packages results.

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“…2 Simplified jet engine inlet model design, fabrication and measurements The simplified inlet model was first adopted in [2], and further analysed in [3][4][5][6][7][8][9][10][11]. There are two basic versions of this model, one with straight blades, depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of miscellaneous methods applied to a benchmark, inlet scattering problem

Fromentin-Denozière¹,

Simon²,

Tzoulis³

et al. 2015

IET Radar, Sonar & Navigation

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Several well-known computational methods, based on various mathematical concepts, are applied to the electromagnetic scattering analysis of a benchmark cavity structure. Specifically, a simplified jet engine inlet configuration is defined, constructed and used as reference, whereas predicted numerical results for the radar cross-section are compared with measurements. The merits and drawbacks of each method are highlighted and quantified, with respect to accuracy, efficiency, resource requirements, reliability and robustness. Conclusions may be exploited in the near future in the construction of reliable classifiers, used in non-cooperative target identification

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Electromagnetic scattering from simple jet engine models

Cited by 44 publications

References 1 publication

Computation of radar cross section of jet engine inlets

Computation of radar cross section of jet engine inlets

A Novel Hybrid Aipo-Mom Technique for Jet Engine Modulation Analysis

Comparative study of miscellaneous methods applied to a benchmark, inlet scattering problem

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