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High-precision modeling and collision simulation of small rotor UAV

机译：小转子UAV的高精度建模与碰撞仿真

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The high-precision modeling and collision simulation of UAVs should be conducted to achieve the dynamic response of UAV and assess UAV safety. In this paper, a high-precision finite element model of small rotor logistics UAVs on the market was built in LS-DYNA. The process to model the connection structure between a range of parts of a UAV was elucidated in detail. The bolt, damping spring and rivet & thread were respectively simulated with "NRB + beam", "NRB + discrete" and "spot weld". By a series of static and dynamic material tests, the constitutive parameters of main materials of UAV structure were determined. Besides, a reasonable explicit time step was set by regulating the mass scaling of local elements. To verify whether the finite element model of UAV is accurate, UAV underwent a developed full-scale crash test. As revealed from the experimentally achieved results, the trend of impact load over time in collision simulation significantly complied with the experimentally achieved results, and the discrepancy between the maximum impact load peak and the experimentally achieved results only took up 6.54%. Moreover, the vital damaged parts, damaging process and failure mode of the UAV structure in the crash test were accurately characterized in the collision simulation. Thus, the UAV modeling and collision simulation was verified to exhibit feasibility. Lastly, with the verified UAV high precision model, the impacting process, possible damaged parts and failure modes of UAV at the variety of angles and speeds were assessed. Accordingly, the proposed high-precision modeling and collision simulation of small rotor UAV is capable of saving the physical and time resources of UAV structural strength experiments, as well as effectively assessing the structural safety and improving the design of small rotor UAVs. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：应进行无人机的高精度建模和碰撞仿真，以实现无人机的动态响应，并评估UAV安全。本文建立了市场上的小转子物流无人机的高精度有限元模型。详细地阐明了模拟了一系列部分之间的连接结构的过程。螺栓，阻尼弹簧和铆钉和螺纹分别用“NRB +梁”，“NRB +离散”和“点焊”模拟。通过一系列静态和动态的材料测试，确定了UAV结构的主要材料的组成参数。此外，通过调节局部元素的质量缩放来设置合理的显式时间步骤。为了验证UAV的有限元模型是否准确，UAV接受了开发的全尺寸碰撞测试。从实验达到的结果中透露，碰撞模拟随时间的冲击负荷趋势显着符合实验达到的结果，并且最大冲击载荷峰与实验达到的结果之间的差异仅占6.54％。此外，在碰撞试验中，在碰撞试验中的重要损坏部件，无人机结构的破坏性过程和故障模式被精确地表征了碰撞模拟。因此，验证了UAV建模和碰撞仿真以表现出可行性。最后，通过经过验证的无人机高精度模型，评估了影响过程，可能在各种角度和速度下实现无人机的损坏部件和失效模式。因此，小型转子UAV的提出的高精度建模和碰撞仿真能够节省UAV结构强度实验的物理和时间资源，并有效地评估结构安全性和改善小转子无人机的设计。 （c）2021 Elsevier Masson SAS。版权所有。

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