Simulation Analysis of Radar Cross Section for Exterior Component Design of Stealth Fighter

Abstract

In this thesis Radar Cross Section (RCS) analysis of F-22 is performed to study how to design aerodynamic components of stealth fighter design F-22 model used in this study is a simplified one that its inlet and nozzle are blocked with metal plates The RCS of F-22 at 1 GHz horizontally polarized radar wave from different directions are analyzed by using Method of Moment (MOM) in ANSYS HFSS high frequency electromagnetic simulation software All the surfaces are assumed to be perfect electric conductor in the simulation In this study RCS contribution of each exterior components of F-22 are discussed The results show that the vertical stabilizers have the highest contribution among all It is also found that the tilt angle (27°) of current F-22 vertical stabilizers is verified to be optimized tilt angle for its minimum RCS In the mean time a new V-tail design is introduced to reduce RCS of stealth fighters RCS analysis of different tilt angles of V-tail design are performed The results show that the V-tail tilt angle more than 50° effectively reduces its RCS and gets better stealth effects Compared with the baseline F-22 the average RCS can be reduced by about 5 dBsm In this study a F-22 model with an inlet design is also established to study the RCS difference with and without inlet cavity effects The results show that the forward RCS of the model with the inlet is larger because of the inlet cavity effects The forward average RCS of the model with the inlet is higher by about 10 dBsm

Date of Award	2020
Original language	English
Supervisor	Tzong-Shyng Leu (Supervisor)