Neal-Smith时域PIO预测准则及应用

基于Neal-Smith频域准则,Neal-Smith时域准则(TDNS, Time Domain Neal-Smith criterion)是另一重要的固定翼飞机驾驶员诱发振荡(简称PIO)预测准则,其无需对人机系统的非线性进行任何假设和简化.以某机型为模型,采用TDNS,通过俯仰角闭环操纵误差信号与目标捕获时间之间的关系来同时预测I、II型驾驶员诱发振荡,同时分析了不同速率限制环节对预测结果的影响,基于误差信号的均方差及其二次偏导数,得到了TDNS准则一般计算方法及各个影响因素的关系.结果表明,TDNS准则的计算方法可行、直观、高效.

Time domain Neal-Smith criterion and PIO prediction

A quantitative criterion named time domain Neal-Smith criterion (TDNS) for the evaluation of pilot-induced oscillations (PIO) tendencies in fix e d-wing aircraft has been developed. The criterion is formulated in the time-do ma in to permit evaluation of flight control nonlinearities without assumption or c ompromise, and explicitly mirrors the frequency-domain Neal-Smith flying quali ti es criterion through the development of time-domain replicates to the frequency -domain criterion parameters. Category I and II PIO were predicted using TDNS, w hich is essentially based on the relationship of acquisition time and error sign al of the pitch angle tracking in the closed-loop system, based on a certain fi g hter. The effects of rate limiting to prediction results were analyzed and a met hod of TDNS calculation was got, in which the root-mean squared pitch tracking e rror after the acquisition time and its second derivative metric are proposed as a direct indicator of PIO propensity. The results show the method is available, illustrative and efficient.