• International Journal of Aeronautical and Space Sciences
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• v.15 no.3
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• pp.309-319
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• 2014

This paper mainly focuses on the conceptual design and stealth performance of the three-surface military aircraft. A three-dimensional (3-D) digital mock-up of the three-surface strike fighter with stealth feature was designed and the schemes of carrying missiles were analyzed in CATIA. Based on physical optics principle and the Method of Equivalent Currents (MEC), a numerical simulation of the RCS feature of the aircraft was carried out with RCSPlus which is a software designed by Beihang University. The paper contributes to the RCS feature analysis of the whole plane and different parts on X-band, S-band and UHF-band and a comparison of RCS feature to Su-37 and T-50 military aircraft is drawn. On X-band, the pitch angle of the incident wave was $0^{\circ}$, and the result shows: (1) Compared with Su-37 aircraft, the forward scattering RCS of the three-surface strike aircraft was reduced to 14.9%, the side scattering RCS to 9.6% and the back scattering RCS to 40.2%. (2) Compared with T-50 aircraft, the forward scattering RCS was reduced to 38.61%, and the side scattering RCS to 67.26%. This paper should be useful for researchers in conceptual design and stealth technology of the military aircraft.

• International Journal of Aeronautical and Space Sciences
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• v.15 no.4
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• pp.366-373
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• 2014

A conceptual design of a three-surface strike fighter was studied and stealth performance was taken into account to enhance survivability and battle effectiveness. CATIA was used to design the aircraft's three-dimensional prototype model and the weapon carriage arrangement was also studied. The aircraft's RCS characteristics and distributions under X, S, C, and L bands were simulated using the RCSPlus software, which is based on the PO method. Pressure and velocity distributions of the flow field were also simulated using CFD. A turbulence model was based on standard $k-{\varepsilon}$ function and N-S functions were used during the CFD computation. Lift coefficients, drag coefficients, and lift-to-drag ratio were obtained by aerodynamic simulation. The results showed that: (1) the average value of head-on RCS between ${\pm}30^{\circ}$ is below -3.197 dBsm, and (2) the lift coefficient is 0.34674, the drag coefficient is 0.04275, and the lift-to-drag ratio is 8.11087 when the attack angle is $2.5^{\circ}$.

• Aerospace Industry
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• v.48
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• pp.50-55
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• 1997

미국 차세대 통합공격전투기(Joint Strike Fighter)의 실증선행실험기 메이커로 보잉사와 록히드마틴의 양사를 지명하고 실증기 제작계약을 체결함으로써 이제 동 계획은 제2단계에 돌입했다. 당초 미 국방부는 선진 전술기로 단거리이륙, 수직착륙기를 생각하고 개발에 착수한 이래 다시 통합선진공격전투기술(JAST) 계획을 세워 공군과 해군, 해병대에서 공용할 수 있는 범용 최신예 전투기를 개발할 계획아래 MD, 보잉, 록히드마틴의 3개사에 실증선행 실험기 제작제안서를 의뢰하여 이번에 실증기 제작 대상으로 2개사가 선정되어 향후에 따라 각각 2기씩 실증기(CDA)를 제작하게 되었다. 이 실증기에 의하여 통합전투공격기를 개발할 1개사를 선정 2001년부터 실용형을 만든다는 것이다. JSF계획의 여로모를 정리해본다.