AVEN装置运动奇异性分析

研究了AVEN装置驱动机构的构型分岔特性和扩张调节片导引机构RRSR运动链的构型分岔特性，发现，无论是否发生偏转，当以喷口面积作为分岔参数时，AVEN装置都存在转向点奇异位置；当以矢量偏转角为分岔参数时，AVEN装置不存在奇异位置。当AVEN装置处于非矢量状态时，扩张调节片导引机构RRSR运动链处于多重奇异位置状态。转向点奇异位置和RRSR运动链的多重奇异位置，导致AVEN装置的运动输出具有不确定性，影响含AVEN装置飞机的空中飞行安全。

Singularity analysis of the AVEN

The configuration bifurcation behaviors of the AVEN driving parallel mechanism and the RRSR kinematic chains which drive the divergent flaps are analyzed. It is found that whether deflecting or not, the turning points will exist corresponding to the bifurcation parameter of the area exhaust nozzle, and the turning points will disappear corresponding to the bifurcation parameters of the deflecting angle. While the AVEN is in non-vector status, the guiding kinematic chain of divergent flaps, RRSR, is at its multi-singular position. Both the turning points and multi-singular positions will lead the motion of the AVEN uncertain. This kind of motion uncertainty is harmful to the safety of aircrafts with the AVEN.