Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, United States of America.
Bioinspir Biomim. 2022 Nov 21;18(1). doi: 10.1088/1748-3190/ac9fb1.
The role of aerodynamics and wing inertia on the motion dynamics for the maneuvering flight of two bats from two species of roundleaf bats,andare investigated. Comparative studies among a straight flight, two ascending sweeping right turns, and a U-turn reveal that inertial forces play an essential and sometimes crucial role in the maneuvers. The translational trajectory of the bat is mostly driven by aerodynamic forces generated by the wings along the flight path, whereas inertial forces for the most part drive the intra-cycle fluctuations. However, inertial forces are found to contribute non-trivially to the ascending motion of theduring the sweeping turn and the U-turn. The roll maneuver is found to be primarily driven by aerodynamic asymmetries during flight, whereas the yaw maneuver is primarily driven by imbalances in wing inertial moments. Inertial moments resulting from Coriolis and centrifugal forces are found to play an important role in accurate yaw prediction. The moment due to Coriolis force plays a very prominent role in predicting the correct yaw angle during the extreme 180° U-turn.
对两种圆叶蝙蝠的机动飞行中空气动力学和翼惯性的作用进行了研究。对直飞、两个向右扫掠上升转弯和一个 U 型转弯的比较研究表明，惯性力在机动中起着至关重要的作用。蝙蝠的平移轨迹主要由翅膀沿飞行路径产生的空气动力驱动，而惯性力在很大程度上驱动着循环内的波动。然而，发现惯性力对在扫掠转弯和 U 型转弯过程中的上升运动有重要贡献。在飞行过程中，滚转机动主要由空气动力不对称驱动，而偏航机动主要由翼惯性矩不平衡驱动。发现科里奥利力和离心力产生的惯性矩在准确预测偏航方面起着重要作用。科里奥利力产生的力矩在预测极端 180°U 型转弯时的正确偏航角方面起着非常重要的作用。
