测定平尾铰链力矩系数的试飞方法

A METHOD FOR MEASURING HORIZONTAL STABILIZER HINGE MOMENT COEFFICIENTSFROM AN AIRCRAFT

在试飞中为了解决平尾下洗角无法测定的困难，提出了一种测定基本铰链力矩系数的方法──外推截距法，并概述了铰链力矩系数及其导数的测量方法。简单介绍了下洗角、基本铰链力矩系数和最大铰链力矩的理论估算方法及几个有关参数的修正问题。还讨论了所测数据的精度以及由于最大铰链力矩数值可能引起的飞行限制。

In order to overcome a difficulty for measuring the downwash angle ofstabilizer from flight test,a method for measuring horizontal stabilizer hinge-momentcoefficients from an aircraft-the Extrapolated-Intercept Method is presented in thispaper.Several measuring methods for hinge-moment coefficients and their derivatives dueto angle of attack and stabilizer angle are also described.It briefly introduces the theoreticalestimation for the associated parameters(includingε,C_(yB)and C,m_(he)and m_(he0),andM_(ke max max)), and the correction of the effects of angle of attack,and center of gravity positionon hinge-moment coefficients.It mainly discusses the accuracy of data obtained in flightand the night limit for the aircraft caused by maximum hinge-moments.