TY  - EJOU
AU  - Chen, Changyao 
AU  - Song, Jialei 
AU  - Yin, Ling 
AU  - Li, Yizhe 
AU  - Yuan, Zheng 
AU  - Yuhan	Li, 

TI  - Virtual	Manipulation	of	Tail	Postures of	a	Barn	Owl Demonstrates	 Longitudinal	Static	Unstability	 when	Gliding
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 25
IS  - 1
SN  - 1933-2815

AB  - Bird	can	switch	between	high	maneuverability	and	high	stability	due	to	its	ability	to	substantially	morph	
wings	and	tail.	Tail	as	an	auxiliary	lift	surface,	plays	an	important	role	on	lift	and	drag	production	and	also	
significantly	affects	the	longitudinal	stability.	In	this	study,	we	reconstruct	a	high-fidelity	barn	owl	model	
using	 the point	 cloud	 of	 its	 surface	 obtained	 from	 high-speed	 photogrammetry,	 and simulate	 the	 fluid	
dynamics	using	a	commercial	software.	By	virtually	manipulating	the	tail	to	a	series	of	postures,	we	analyze	
the	aerodynamics	and	static	stability	for	each	tail	posture,	investigating	the	strategy	to	adjust	the	stability	
during	gliding	flight.	For	simplification,	only	the	tail	pitch	and	spread	are	studied,	with	the	tail	spread	angle	
ranging	from to and	the	pitch	angle	ranging	from to,	which	enveloping	regular	adjustment	of	the	tail.	Our	
preliminary	study	shows	that	the	tail	could	not achieve the	static	stability with	the	original	wing	postures,	
indicating	 that	tail	alone	could not be	sufficient	for	stability	control.	The	result	of	further	study	will	benefit	
the	design	of	agile	morphing	micro	air	vehicles.
KW  - Bird	flight;	longitudinal	static	stability;	angle	of	attack;	pitching	moment

DO  - 10.32604/icces.2023.09859