A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation
For tilt-rotor aircraft with coaxial rotors (coaxial rotor aircraft), reduction of radar cross section as well as acoustic noise can be essential for stealth design, and the rotation of the coaxial rotors can have an influence on noise and dynamic radar cross section (RCS) characteristics. In this p...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/24/9711 |
| _version_ | 1797455404697911296 |
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| author | Zeyang Wang Jun Huang Mingxu Yi Shaoze Lu |
| author_facet | Zeyang Wang Jun Huang Mingxu Yi Shaoze Lu |
| author_sort | Zeyang Wang |
| collection | DOAJ |
| description | For tilt-rotor aircraft with coaxial rotors (coaxial rotor aircraft), reduction of radar cross section as well as acoustic noise can be essential for stealth design, and the rotation of the coaxial rotors can have an influence on noise and dynamic radar cross section (RCS) characteristics. In this paper, an approach to the prediction of both the sound pressure level (SPL) of noise and the dynamic RCS of coaxial-tilt aircraft is carried out, based on the theories of the FW-H equation, the physics optics method (PO) and the physical theory of diffraction (PTD) method. In order to deal with the rotating parts (mainly including coaxial rotors), a generated rotation matrix (GRM) is raised, aiming at giving a universal formula for the time-domain grid coordinate transformation of all kinds of rotation parts with arbitrary rotation centers and rotation axis directions. Moreover, a compass-scissors model (CSM) reflecting the phase characteristics of coaxial rotors is established, and a method of noise reduction and RCS reduction based on the phase modulation method is put forward in this paper. The simulation results show that with proper CSM parameter combinations, the reduction of noise SPL can reach approximately 3~15 dB and the reduction of dynamic RCS can reach 1.6 dBsm at most. The dynamic RCS and noise prediction and reduction method can be meaningful for the radar-acoustic stealth design of coaxial tilt-rotor aircrafts. |
| first_indexed | 2024-03-09T15:52:57Z |
| format | Article |
| id | doaj.art-d1e056e05685459fbc97faf81b8a1dc9 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T15:52:57Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj.art-d1e056e05685459fbc97faf81b8a1dc92023-11-24T17:54:05ZengMDPI AGSensors1424-82202022-12-012224971110.3390/s22249711A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase ModulationZeyang Wang0Jun Huang1Mingxu Yi2Shaoze Lu3School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100083, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100083, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100083, ChinaFor tilt-rotor aircraft with coaxial rotors (coaxial rotor aircraft), reduction of radar cross section as well as acoustic noise can be essential for stealth design, and the rotation of the coaxial rotors can have an influence on noise and dynamic radar cross section (RCS) characteristics. In this paper, an approach to the prediction of both the sound pressure level (SPL) of noise and the dynamic RCS of coaxial-tilt aircraft is carried out, based on the theories of the FW-H equation, the physics optics method (PO) and the physical theory of diffraction (PTD) method. In order to deal with the rotating parts (mainly including coaxial rotors), a generated rotation matrix (GRM) is raised, aiming at giving a universal formula for the time-domain grid coordinate transformation of all kinds of rotation parts with arbitrary rotation centers and rotation axis directions. Moreover, a compass-scissors model (CSM) reflecting the phase characteristics of coaxial rotors is established, and a method of noise reduction and RCS reduction based on the phase modulation method is put forward in this paper. The simulation results show that with proper CSM parameter combinations, the reduction of noise SPL can reach approximately 3~15 dB and the reduction of dynamic RCS can reach 1.6 dBsm at most. The dynamic RCS and noise prediction and reduction method can be meaningful for the radar-acoustic stealth design of coaxial tilt-rotor aircrafts.https://www.mdpi.com/1424-8220/22/24/9711coaxial tilt-rotor aircraftcompass-scissors modelgenerated rotation matrixcarpet diagramdynamic RCSnoise SPL |
| spellingShingle | Zeyang Wang Jun Huang Mingxu Yi Shaoze Lu A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation Sensors coaxial tilt-rotor aircraft compass-scissors model generated rotation matrix carpet diagram dynamic RCS noise SPL |
| title | A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation |
| title_full | A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation |
| title_fullStr | A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation |
| title_full_unstemmed | A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation |
| title_short | A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation |
| title_sort | dynamic rcs and noise prediction and reduction method of coaxial tilt rotor aircraft based on phase modulation |
| topic | coaxial tilt-rotor aircraft compass-scissors model generated rotation matrix carpet diagram dynamic RCS noise SPL |
| url | https://www.mdpi.com/1424-8220/22/24/9711 |
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