Radar/infrared integrated stealth optimization design of helicopter engine intake and exhaust system

Zhou, Zeyang; Huang, Jun; Wang, Jinjun

doi:10.1016/j.ast.2019.105483

Cited by 31 publications

(16 citation statements)

References 26 publications

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“…In the PO method, the far-field electric field formula can be expressed as follows:

where k is the wavenumber, ω is the angular frequency, μ is the magnetic permeability, J s is the surface current, s means radiation direction, r ′ is the source point coordinate vector, r is the field point, ε is the dielectric constant, ρ s is the charge density, d S is the integral facet [ 8 , 18 ]. Under the irradiation of plane waves, the target RCS calculation formula can be written as:

where R is the distance between the field point and the source point, e s is the direction of the scattered electric field, E i is the electric field intensity at the point of incidence.…”

Section: Dynamic Analysis Approachmentioning

confidence: 99%

“…For the solution of the radar cross-section (RCS) of aircraft targets, many research methods and work have been presented, including the method of moment (MOM) [ 1 ], physical optics (PO) [ 4 , 5 ], flight testing [ 6 , 7 ] and physical theory of diffraction (PTD) [ 8 ]. The combination of the fact-based asymptotic method and the geometrical optics (GO) and PO hybrid method is used to calculate the RCS of a large target [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

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X-Band Radar Cross-Section of Tandem Helicopter Based on Dynamic Analysis Approach

Zhou

Huang

2021

Sensors

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In order to study the radar signature of a tandem helicopter in the X-band, a dynamic analysis approach (DAA) is presented to determine its radar cross-section (RCS) under different influence factors. The basic passage time, rotation speed, observation angle, rotor disk inclination, fuselage attitude angle and Doppler feature are studied and discussed in detail. The results show that the dynamic characteristics of the rotor RCS will bring significant changes to the peak and average values of the helicopter RCS. Within a given observation angle range, a larger elevation angle is undesirable for helicopter stealth. The inclination of the rotor disc will affect the many small peaks and local fluctuations of the helicopter RCS. The positively increased attitude angle will have an undesirable effect on the average RCS and dynamic characteristics of the helicopter. The DAA is feasible and effective for studying the radar cross-section of a tandem helicopter.

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“…In the PO method, the far-field electric field formula can be expressed as follows:

where R is the distance between the field point and the source point, e s is the direction of the scattered electric field, E i is the electric field intensity at the point of incidence.…”

Section: Dynamic Analysis Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

X-Band Radar Cross-Section of Tandem Helicopter Based on Dynamic Analysis Approach

Zhou

Huang

2021

Sensors

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“…where r 0 is the position vector of any point on the triangular facet, and ∆A represents the area of the triangular facet. The physical theory of diffraction (PTD) is used to solve the edge diffraction of the target model [3,5]; then, the target total RCS is the RCS sum of all facets and all splits:…”

Section: Dynamic Electromagnetic Scatteringmentioning

confidence: 99%

“…Modern helicopters are moving toward high speed and stealth while pursuing more excellent aerodynamic and handling characteristics [1,2], such as X2 (Sikorsky, City of Stateford, CT, USA), Tiger (Eurocopter, Paris, France), and RAH-66 (Boing, Chicago, USA) [3]. Due to the rotating parts such as the main rotor and the tail rotor, the research on the dynamic electromagnetic scattering characteristics of helicopters has always been a difficult point.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rotor Dynamic Scattering on Helicopter Radar Cross-Section

Zhou

Huang

2020

Sensors

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With the continuous improvement and development of armed helicopters, the research on their stealth characteristics has become more and more in depth. In order to obtain the complex effect of stealth characteristics caused by the high-speed rotation of rotor-like components, a dynamic scattering method (DSM) is presented. Rotation speed, azimuth, elevation angle, pitching angle, and rolling angle are studied and discussed in detail. The results show that the electromagnetic scattering characteristics of the main rotor and tail rotor are dynamic and periodic. This period characteristic is related to the rotation speed and attitude angle of the rotor. The radar cross-section (RCS) of the helicopter varies greatly at different observation angles and attitude angles, but the dynamic electromagnetic scattering effect caused by the main rotor and tail rotor cannot be ignored. The presented DSM is effective and efficient for studying the dynamic RCS of the rotor-type parts of a helicopter or the whole machine.

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“…В роботі [7] запропоновано спосіб екранування вихлопної системи ГТД з аналізом інфрачервоної сигнатури системи «вихлопний трактекранновихлопний пристрій». Проведено чисельне дослідження з врахуванням геометричних розмірів, аеродинамічних та газодинамічних характеристик ЕВП з імітацією в польоті.…”

Section: дослідження існуючих рішень проблемиunclassified

Development of method of testing a set of screen-exhaust devices in the helicopter Mi-8MSB-B

Kinaschuk

2020

TAPR

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Використання екранно-вихлопних пристроїв (ЕВП) в газотурбінних двигунах (ГТД) вертольотів є одним із ефективних засобів пасивного захисту 2. Об'єкт дослідження та його технологічний аудит Об'єктом досліджень є комплект екранно-вихлопних пристроїв (ЕВП) у складі вертольоту Мі-8МСБ-В (український варіант модернізації радянського багатоцільового вертольота Мі-8, розроблений акціонерним товариством «Мотор Січ», м. Запоріжжя, Україна).

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Radar/infrared integrated stealth optimization design of helicopter engine intake and exhaust system

Cited by 31 publications

References 26 publications

X-Band Radar Cross-Section of Tandem Helicopter Based on Dynamic Analysis Approach

X-Band Radar Cross-Section of Tandem Helicopter Based on Dynamic Analysis Approach

Influence of Rotor Dynamic Scattering on Helicopter Radar Cross-Section

Development of method of testing a set of screen-exhaust devices in the helicopter Mi-8MSB-B

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