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Fabrication and Control of Bio-mimetic Flapping Ornithopter Using Smart Soft Composite

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Authors
김민식
Advisor
안성훈
Major
공과대학 기계항공공학부
Issue Date
2018-02
Publisher
서울대학교 대학원
Keywords
Shape Memory AlloyScaffoldBendingTwistingFrequencyDeformationLaminatesCompositeFlapping
Description
학위논문 (석사)-- 서울대학교 대학원 : 공과대학 기계항공공학부, 2018. 2. 안성훈.
Abstract
Fabrication of a flapping actuator entails a few possible materials such as shape
memory alloy (SMA), ionic polymer-metal composite, and piezo-ceramic material. In
this research, SMA wires were embedded into the soft composite actuator as the main
source of flapping motion. In order to build the flapping actuator capable of highfrequency
motion, a soft composite was fabricated, integrating mainly 3 components:
SMA wires as the actuating source, 3D printed scaffolds as a control matrix for the
SMA wires which together create intended motion, and PDMS as a binder to hold all
the parts as one solid piece. The flapping mechanism is basically induced from the
division of the SMA wires into two groups on each side making it possible for the whole
actuator to move up and down when electricity is alternatively applied to each set of
SMA wires. With the mechanism, two types of flapping actuators were developed and
tested
one is the flipper type flapping actuator which displayed slow frequency
actuation with large deformation and the other one is miniature type high speed
actuator with relatively small deformation. Combining the designs of the two actuators,
a flapping module was optimized and made. A few models of bat-like ornithopter were
designed and fabricated, based on the flapping module. Design factors such as
wingspan, weight and angular orientation of the wings to the body were considered for
each model. Models with different design factors displayed distinguishing performance. ii
By repeating the process of optimization on fabrication and control, a model with the
best performance was chosen and tested. The optimal configuration of the testing and
design factors were 7.5 Hz frequency and 30 o angular orientation where the lift force
was maximized. Without the usage of mechanical components such as motors and
gears, it was successful to make the ornithopter which displays a flight behavior.
Language
English
URI
http://hdl.handle.net/10371/141385
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Mechanical Aerospace Engineering (기계항공공학부)Theses (Master's Degree_기계항공공학부)
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