Target head direction far field radar cross section reduction based on narrow surface element method

2020

Sensors

Self Cite

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.

Section: Introductionmentioning

confidence: 99%

Influence of Rotor Dynamic Scattering on Helicopter Radar Cross-Section

2020

Sensors

Self Cite

“…16 In order to solve the head-direction RCS of a curved surface, a narrow surface element method is presented to deal with the electromagnetic scattering characteristics of curved surfaces when geometric parameters change. 17 For the reduction of discrete errors for continuity equations, an adaptive mesh technique could efficiently cluster the grid nodes in sensitive regions by redistribution and relocation of the grid nodes. 18 The electromagnetic scattering characteristics of helicopters mainly come from the fuselage, rotor and tail rotor, [19][20][21] where the rotor components are the most important scattering sources of dynamic RCS.…”

Section: Introductionmentioning

confidence: 99%

Grid transformation and dynamic scattering for tail rotor radar cross section analysis

Proceedings of the Institution of Mechanical Engineers, Part G:

2020

Self Cite

With the promotion and enhancement of stealth technology of helicopter rotor components, the research on the dynamic radar cross section (RCS) of helicopter rotor is becoming more and more important and imminent. In order to facilitate the calculation and analysis of the electromagnetic scattering characteristics during rotor rotation, a dynamic scattering calculation (DSC) method based on quasi-static principle (QSP) and grid coordinate transformation is presented. After analyzing the advantages and disadvantages of QSP, the dynamic principle is used to describe the rotation process of the rotor. Combined with the grid coordinate transformation method, the RCS of the rotor is accurately calculated by physical optics (PO) and physical theory of diffraction (PTD). Then the influence of azimuth, elevator angle and observation distance on rotor dynamic RCS is analyzed. The results show RCS of the tail rotor is indeed dynamic and periodic and its main influencing factors include azimuth and elevation angle. The proposed DSC method is efficient and effective for studying the dynamic RCS of tail rotor.

“…The difficulty with this type of problem is that the rotor rotates at high speed and its support structure is still stationary or relatively stationary, which causes the grid data of the entire model to be constantly updated. The grid transformation method is widely used to solve the electromagnetic scattering problem of the target body [25,26], which could reduce a large amount of calculation time and experimental cost [27]. Component decomposition methods, improved mesh transformation methods, and joint transformation methods are used to solve the dynamic process of the particular problems [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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

2020

Energies

Self Cite

With the continuous advancement of rotor dynamic electromagnetic scattering research, the radar cross-section (RCS) of turbofan engines has attracted more and more attention. In order to solve the electromagnetic scattering characteristics of a biaxial multirotor turbofan engine, a dynamic scattering method (DSM) based on dynamic simulation and grid transformation is presented, where the static RCS of the engine and its components is calculated by physical optics and physical theory of diffraction. The results show that the electromagnetic scattering of the engine is periodic when the engine is working stably, while the rotors such as fans and turbines are the main factors affecting the dynamic electromagnetic scattering and the ducts greatly increase the overall RCS level of the engine. The proposed DSM is effective and efficient for studying the dynamic electromagnetic scattering characteristic of the turbofan engine.