低RCS齿形挂架参数选择研究

常规飞机的机翼与外挂架构成90°的二面角,成为飞机侧向的重要散射源.为求在不改变机体结构的前提下减缩飞机侧向RCS,采用齿形方案改变了挂架外形,消除了直角二面角结构,削弱了耦合效应.计算结果显示,改形的国产某型战斗机的机翼-外挂架结构的RCS在侧向重点姿态角内降低了9~13dBsm,证明了齿形改形方案能明显改善飞机侧向的耦合散射效应.在计算过程中使用了射线追踪法.

Research on Parameter Selection of Low RCS Serrated Pylon

Wing and pylon form a structure which is the major lateral scattering sources of an ordinary aircraft because a dihedral angle of ninety degrees is formed. In order to implement a reduction of RCS without any other change on the aircraft, the outline of the pylon is changed by applying a serrated scheme and the right dihedral angle structure is removed, so coupling effect is waken. Computation results reveal that the RCS of the wing pylon structure on a domestic active fighter plane is reduced by 9 to 13 dBsm in the typical lateral attitude angle range. So it is proved that the serrated scheme could be significant useful in the control of the lateral coupling RCS of the ordinary aircraft. The ray trace method is used to do the calculation of the RCS.