TITLE:
Measurement of Vibrational Stiffness and Air Damping of Damselfly Wings
AUTHORS:
Rupan Talukder, Kunigal N. Shivakumar
KEYWORDS:
Vibration, Natural Frequency, Stiffness, Damselfly Wing, Damping Ratio, Biomorph
JOURNAL NAME:
Journal of Biomaterials and Nanobiotechnology,
Vol.7 No.3,
June
24,
2016
ABSTRACT: A simple cantilever
beam vibration test method made of biomorph and insect wing, were used to
measure the vibrational stiffness and the air damping of insect wings. Vibration
tests were performed in vacuum pressures to atmosphere and the wing stiffness
and air damping factor were measured. The test method was found to be a viable
method for measuring wing stiffness, natural frequencies and mode shapes. The
vibrational deformation of the insect wings was found to be combination of
bending and torsion because of unsymmetrical geometry of wing. The measured
stiffness (K) of damselfly wings
varied from 0.18 to 0.31 N/m and the air damping ratio ranged from 0.72 to
0.79. The undamped natural frequency (fn)
at 13 kPa varied from 249 to 299 Hz and at atmosphere it varied from 168 to 198
Hz.