飞机圆周盘旋时拖缆的动力学建模与分析

Dynamics Modeling and Simulation of Circularly Aerial Towed Cable Systems

摘要:

构建了飞机圆周盘旋时拖缆的多体动力学模型.基于对拖缆运动状态的研究及其受力情况的分析，运用多刚体法建立了拖缆离散模型，对系统进行动力学仿真分析，得到了拖缆旋转平衡的稳态构型.计算结果与在相同条件下对拖缆连续模型应用微元法的数值计算构型相似，表明所建的多刚体动力学模型是正确可信的，且仿真求解是快速准确的.最后，详细地分析了不同参数对拖缆垂直长度的影响.研究结果表明，在实际应用中飞机速度是影响系统正常工作的关键因素；为确保垂直度在要求范围内，在一定条件下，应合理减小飞机速度，来增加拖缆的垂直度；应用二分法得出了系统有效工作的速度范围.

关键词:拖缆; 动力学模型; 稳态构型; 垂直度

Abstract:

The multi-body dynamics model of the towed cable is proposed in the aircraft circular motion. Based on the analysis of motion state and force of the towed cable which is established via the multi-rigid method, the dynamic simulation analysis is carried out, and the steady configuration of the rotation balance is achieved. In the same condition, it is similar to the numerical calculation configuration of micro-element method of the continuous model. All these illustrate that the new dynamic model is correct and credible, and the simulation solution is also robust and accurate. Finally, the influence of various parameters on the vertical length of the towed cable is analyzed in detail. The simulation results show that the aircraft speed is the most important factor which affects the system’s efficiency, and with some certain conditions, reasonable reducing the aircraft speed can increase the vertical length of the towed cable. The effective speed range is also calculated by the dichotomy.

Key words:towed cable; dynamic model; steady configuration; vertical length