拖缆张力计算及断缆飞行速度的确定

Calculation of Towline Tension and Identification of Faultline Flight Speed

拖靶作为空靶系统的重要一环,在拖航过程中拖缆所受张力必须限定在允许值内。根据稳定拖航状态下拖靶和拖缆的受力状态分析,给出了拖缆张力、倾角与拖航速度、高度以及拖缆参数等量的关系式。运用公式计算得出了拖靶拖缆的张力值和曲线。依据张力-速度曲线与拖缆的抗拉强度确定了不同情况下致断拖缆的临界飞行速度。

First, the paper analyzes the stress conditions of tow target and towline under the stable towing state and gets the equivalence relation among towline tension, dip angles, towing speed, height, towing pa- rameters. Next, the equation is employed to obtain the tension value and curve of tow target and towhne. And then the paper tries to identify the different critical speeds when the aircraft breaks away from the towline under different conditions on a basis of some factors like tension, velocity curve and compressive strength. It turns out that the calculated value agrees with the measured value, which indictates that the tested method of calculating the towline tension has practical value.