为验证拦阻索中应力的传播对拦阻过程的影响,研究了计及弯折波的舰载机拦阻过程的比例-积分-微分(PID)控制问题。先以液压阻尼力作为拦阻过程的控制输入建立了无弯折波的理想拦阻过程动力学模型,再依据拦阻过程中需要保持拦阻钩载为常值的要求,借助最优控制方法获得了一组理想轨迹。然后详细分析了拦阻索中弯折波在甲板滑轮与钩-索啮合点间的传播特征,获得了离散的弯折波模型,并将之应用于拦阻过程的PID跟踪控制中。结果表明,弯折波的计入,会使拦阻钩载在拦阻初期出现波动效应,这一现象与美国军用标准MIL-STD-2066中实验得到的钩载随行程变化规律一致。
To validate the influence of the stress wave propagation on the arresting process, this paper presents a study of the proportion-integral-differential (PID) control of the arresting process during carrier aircraft landing with consideration of the kink-wave that travels along the arresting cable. Taking the hydraulic damping force as a control input for the arresting process, a dynamic model for an ideal arrestment without the kink-wave is first established. Based on the constant hook load condition during the arresting process, a set of ideal trajectories is obtained with an optimal control method. Afterwards, the propagation characteristics of the kink-wave that travels between the deck sheave and the hook are analyzed. Then a discrete kink-wave model is obtained and applied to the PID control of the arresting process in tracking an ideal trajectory. The result shows that when the kink-wave is taken into consideration, the hook load will vibrate at the initial period of the arresting process, which is consistent with the experimental result of American military standard MIL-STD-2066.
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