A Bio-Inspired Flapping Wing Rotor of Variant Frequency Driven by Ultrasonic Motor
A Bio-Inspired Flapping Wing Rotor of Variant Frequency Driven by Ultrasonic Motor
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DOI：
10.3390/app10010412
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发表时间：
2020-01
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影响因子：
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通讯作者：
Si Chen;Le Wang;Shijun Guo;Chunsheng Zhao;Mingbo Tong
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文献类型：
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作者：
Si Chen;Le Wang;Shijun Guo;Chunsheng Zhao;Mingbo Tong
通过结合扑动和旋转运动，仿生扑翼转子 (FWR) 是一种独特的运动运动学。与垂直起降（VTOL）中模仿昆虫翅膀相比，它可以产生明显更大的气动升力和效率。为了产生相同的升力，FWR的扑动频率、扭转角和自航转速明显小于昆虫扑翼和旋翼。然而，与它的对手一样，FWR 在扑动周期中的可变扑动频率 (VFF) 对其空气动力特性和效率的影响仍有待评估。建立FWR模型进行实验工作。为了能够在冲程期间快速改变扑动频率，使用超声波电机 (USM) 来驱动 FWR。使用计算流体动力学 (CFD) 的实验和数值模拟是在 VFF 范围内进行的，而不是通常的恒定扑动频率 (CFF) 情况。测量的升力与 CFD 结果非常吻合。上冲程的扑动频率比下冲程小，负升力和惯性力可以显着减小。在相同的输入电机功率或等效扑动频率下，VFF 运动大于 CFF 时 FWR 的平均升力。换句话说，VFF 情况产生指定升力所需的功率小于 CFF 情况。对于该 FWR 模型，获得高升力和高效率的机翼最佳安装角度为 30°，VFF 情况下的斯特劳哈尔数在 0.3-0.36 之间。
By combining the flapping and rotary motion, a bio-inspired flapping wing rotor (FWR) is a unique kinematics of motion. It can produce a significantly greater aerodynamic lift and efficiency than mimicking the insect wings in a vertical take-off and landing (VTOL). To produce the same lift, the FWR’s flapping frequency, twist angle, and self-propelling rotational speed is significantly smaller than the insect-like flapping wings and rotors. Like its opponents, however, the effect of variant flapping frequency (VFF) of a FWR, during a flapping cycle on its aerodynamic characteristics and efficiency, remains to be evaluated. A FWR model is built to carry out experimental work. To be able to vary the flapping frequency rapidly during a stroke, an ultrasonic motor (USM) is used to drive the FWR. Experiment and numerical simulation using computational fluid dynamics (CFD) are performed in a VFF range versus the usual constant flapping frequency (CFF) cases. The measured lifting forces agree very well with the CFD results. Flapping frequency in an up-stroke is smaller than a down-stroke, and the negative lift and inertia forces can be reduced significantly. The average lift of the FWR where the motion in VFF is greater than the CFF, in the same input motor power or equivalent flapping frequency. In other words, the required power for a VFF case to produce a specified lift is less than a CFF case. For this FWR model, the optimal installation angle of the wings for high lift and efficiency is found to be 30° and the Strouhal number of the VFF cases is between 0.3–0.36.