Document Detail

Differential pressure distribution measurement with an MEMS sensor on a free-flying butterfly wing.
MedLine Citation:
PMID:  22711175     Owner:  NLM     Status:  Publisher    
An insect can perform various flight maneuvers. However, the aerodynamic force generated by real insect wings during free flight has never been measured directly. In this study, we present the direct measurement of the four points of the differential pressures acting on the wing surface of a flying insect. A small-scale differential pressure sensor of 1.0 mm × 1.0 mm × 0.3 mm in size was developed using microelectromechanical systems (MEMS) and was attached to a butterfly wing. Total weight of the sensor chip and the flexible electrode on the wing was 4.5 mg, which was less than 10% of the wing weight. Four points on the wing were chosen as measurement points, and one sensor chip was attached in each flight experiment. During takeoff, the wing's flapping motion induced a periodic and symmetric differential pressure between upstroke and downstroke. The average absolute value of the local differential pressure differed significantly with the location: 7.4 Pa at the forewing tip, 5.5 Pa at the forewing center, 2.1 Pa at the forewing root and 2.1 Pa at the hindwing center. The instantaneous pressure at the forewing tip reached 10 Pa, which was ten times larger than wing loading of the butterfly.
Hidetoshi Takahashi; Hiroto Tanaka; Kiyoshi Matsumoto; Isao Shimoyama
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-19
Journal Detail:
Title:  Bioinspiration & biomimetics     Volume:  7     ISSN:  1748-3190     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101292902     Medline TA:  Bioinspir Biomim     Country:  -    
Other Details:
Languages:  ENG     Pagination:  036020     Citation Subset:  -    
Information and Robot Technology Research Initiative, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan.
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