Study of the Radar Cross-Section of Turbofan Engine with Biaxial Multirotor Based on Dynamic Scattering Method

Zhou, Zeyang; Huang, Jun

doi:10.3390/en13215802

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…The nonstandard finite-difference time-domain (NS-FDTD) method is an accurate simulation tool having excellent isotropic propagation characteristics for the numerical electromagnetic wave analysis at a desired frequency [1][2][3][4][5][6][7]. Since its accuracy is 10 4 times higher than that of the FDTD technique [8,9], the NS-FDTD approach is suitable for the precise electromagnetic design of objects with electrically large sizes, such as aircrafts comprising various materials, electronic components, and complex airframe shapes [10][11][12][13]. In general, a typical aircraft size is around 500˘− 1800λ at the radar frequency.…”

Section: Introductionmentioning

confidence: 99%

A Nonstandard Path Integral Model for Curved Surface Analysis

2022

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The nonstandard finite-difference time-domain (NS-FDTD) method is implemented in the differential form on orthogonal grids, hence the benefit of opting for very fine resolutions in order to accurately treat curved surfaces in real-world applications, which indisputably increases the overall computational burden. In particular, these issues can hinder the electromagnetic design of structures with electrically-large size, such as aircrafts. To alleviate this shortcoming, a nonstandard path integral (PI) model for the NS-FDTD method is proposed in this paper, based on the fact that the PI form of Maxwell’s equations is fairly more suitable to treat objects with smooth surfaces than the differential form. The proposed concept uses a pair of basic and complementary path integrals for H-node calculations. Moreover, to attain the desired accuracy level, compared to the NS-FDTD method on square grids, the two path integrals are combined via a set of optimization parameters, determined from the dispersion equation of the PI formula. Through the latter, numerical simulations verify that the new PI model has almost the same modeling precision as the NS-FDTD technique. The featured methodology is applied to several realistic curved structures, which promptly substantiates that the combined use of the featured PI scheme greatly improves the NS-FDTD competences in the case of arbitrarily-shaped objects, modeled by means of coarse orthogonal grids.

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Section: Introductionmentioning

confidence: 99%

A Nonstandard Path Integral Model for Curved Surface Analysis

2022

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“…The pipes attached to the jet engines are used as air inlets and exhaust outlet; see Figure 1(b). These pipes are usually modeled as open-ended conducting cylindrical tubes of practical dimensions with radial conducting blades placed inside the cylindrical cavity [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Simulation for Robust Recognition Algorithm of Radar Target by Homing Missiles

Abd-Elfattah¹,

Hussein²,

Farahat³

et al. 2022

PIER B

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A novel signal processing scheme for identification of jet fighter targets by the onboard radar of active and hybrid homing missiles is proposed in the present work. For a specific target, the frequencies of the internal resonances of the cavity-backed apertures existing as the air-inlet pipes of the jet engine are used to construct an interior signature function for the proposed target identification scheme. For the purpose of quantitative description and assessment of the proposed scheme, electromagnetic simulation is used where the air-inlet pipe is modeled as an open-ended conducting cylinder with a number of radial conducting blades placed inside the cylindrical cavity near the open end. The transmitted radar pulse is formed by frequency chirping using linear frequency modulation (LFM) to include the frequencies in the band 1.0-2.0 GHz with high sweep resolution. The selected frequency band is wide enough to distinguish among various jet fighter targets. The CST R ⃝ simulator is used to evaluate the radar cross section (RCS) of the open-ended pipe model with the internal blades due to an incident chirped pulsed plane wave as mentioned above over the frequency band 1.0-2.0 GHz. The proposed target identification algorithm is mathematically described and computationally applied to identify different targets with different dimensions of the jet engine pipe. The effect of the additive white Gaussian noise (AWGN) on the correctness of the target identification decision using the proposed scheme is investigated by calculating the false alarm rate (FAR) with varying the signal-to-noise ratio (SNR). The numerical examinations show that the proposed algorithm succeeds in taking the correct decision regarding the target identification with FAR < 10% for SNR ≥ 12 dB.

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“…17 The dynamic electromagnetic scattering characteristics of the multi-rotor are analyzed. 18 Photovoltaic modules are installed on the surface of the wing, 19 and functional cabins can be added underneath the wing as required. The high frequency method is used to calculate the RCS ∼ azimuth curve of the helicopter.…”

Section: Introductionmentioning

confidence: 99%

W-type flying wing radar cross-section analysis

Zhou

Huang

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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To study the electromagnetic scattering characteristics of a W-type flying wing with two rotors, a computing method is presented. The method includes two modules: dynamic grid transformation and instantaneous RCS (radar cross-section) computing. The results show that the surface of the blade and the leading edge of the wing have a high level of scattering under the irradiation of forward radar waves. The scattering characteristics of the rotor support cabin are enhanced when electromagnetic waves are incident from the side. At the given positive elevation angle, the mean of aircraft RCS curve under side direction decreases first and then increases with the increase in azimuth. The fluctuation range of the aircraft RCS curve under different tail azimuths is similar at the given negative elevation angle. The computing method is effective for analyzing the RCS of the W-type flying wing.

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Study of the Radar Cross-Section of Turbofan Engine with Biaxial Multirotor Based on Dynamic Scattering Method

Cited by 5 publications

References 21 publications

A Nonstandard Path Integral Model for Curved Surface Analysis

A Nonstandard Path Integral Model for Curved Surface Analysis

Electromagnetic Simulation for Robust Recognition Algorithm of Radar Target by Homing Missiles

W-type flying wing radar cross-section analysis

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