Design and Manufacture of Hummingbird-like Flapping Mechanisms and Plastic Kits
碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 102 === In the body of research relevant to versatile flapping micro-air-vehicles (MAV), design and development of light-weight and energy-efficient flapping mechanisms occupies a position of primacy due to its immense impact on the flight performance and mission cap...
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| Format: | Others |
| Language: | zh-TW |
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2014
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| Online Access: | http://ndltd.ncl.edu.tw/handle/8vsw3w |
| Summary: | 碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 102 === In the body of research relevant to versatile flapping micro-air-vehicles (MAV), design and development of light-weight and energy-efficient flapping mechanisms occupies a position of primacy due to its immense impact on the flight performance and mission capability. Realization of a compact flapping mechanism that can produce adequate aerodynamic force for fulfilling the requirements of cruising forward flight and vertical take-off and landing (VTOL) needs the combination of the four-bar-linkage (FBL) and Evan''s straight line mechanism. This paper presents the concerted approach adopted for developing the flapping wing mechanisms for 20 cm span flapping MAVs through an iterative approach involving three design iterations on mechanisms and multiple fabrications approaches such as electrical-discharge-wire-cutting (EDWC) and plastics injection molding. The minimum mass of the polyoxymethylene (POM) mechanism is only 1.78 gram and the maximum flapping frequency is 18.86 Hz. Performance characteristics for each mechanism are evaluated through high speed photography, power take-off measurement, wind tunnel testing and test flights. The maximum lift is 13.4 gram force under the angle of attack of 70° and is beyond the total mass 9.7 gram of the MAV. The resultant flapping mechanism with almost non-existent phase lag between the wings and the extra large flapping stroke up to 120 like birds push this 20 cm-span flapping MAV up to 20 m high in 24 sec.
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