2.5-Dimensional Structure Approach for Miniaturizing Flapping-Wing Air Vehicles.

Area of Science:

• Robotics
• Micro-engineering
• Aerospace Engineering

Background:

• Insect-mimetic flapping-wing air vehicles (FWAVs) offer potential for micro-aerial mobility.
• Current FWAV designs often require complex post-assembly of structural components.
• Miniaturization challenges persist in achieving insect-like flapping motion.

Purpose of the Study:

• To propose a novel 2.5-dimensional (2.5-D) structure approach for insect-mimetic FWAVs.
• To develop integrated design and fabrication methods for FWAVs.
• To achieve a flapping system without post-assembly of structural components.

Main Methods:

• A 2.5-D structure comprising a transmission, supporting frame, and elastic wings was designed.
• A piezoelectric bimorph was utilized to convert translational displacement into large rotational wing displacement.
• Polymer MEMS micromachining was employed for fabricating the 2.5-D structure.
• Resonance was used to achieve insect-comparable flapping frequency and stroke angle.

Main Results:

• The proposed design method successfully reduced the overall size of the FWAV.
• The fabricated micro flapping system demonstrated flapping capabilities comparable to small insects.
• The study achieved the first flapping system for FWAVs without post-assembly of structural components.

Conclusions:

• The proposed 2.5-D structure approach enables significant miniaturization of FWAVs.
• The integrated design and fabrication method simplifies FWAV construction.
• The developed micro flapping system shows promise for bio-inspired micro-aerial vehicles.