Free-flight measurements of aerodynamic viscous effects on lifting re-entry bodies.

1967 ◽  
Vol 4 (8) ◽  
pp. 1064-1069 ◽  
Author(s):  
C. C. HORSTMAN ◽  
M. I. KUSSOY
Keyword(s):  
Free Flight ◽  
Viscous Effects ◽  
Flight Measurements

Free flight measurements of catastrophic water drop breakup

AIAA Journal ◽  
1976 ◽  
Vol 14 (11) ◽  
pp. 1635-1636 ◽  
Author(s):  
W. G. Reinecke ◽  
W. L. McKay
Keyword(s):  
Water Drop ◽  
Drop Breakup ◽  
Free Flight ◽  
Flight Measurements

scholarly journals The influence of sensory delay on the yaw dynamics of a flapping insect

2011 ◽  
Vol 9 (72) ◽  
pp. 1685-1696 ◽  
Author(s):  
Michael J. Elzinga ◽  
William B. Dickson ◽  
Michael H. Dickinson
Keyword(s):  
Feedback System ◽  
System Response ◽  
Feedback Gain ◽  
Free Flight ◽  
Closed Loop Systems ◽  
Tethered Flight ◽  
Body Dynamics ◽  
And Performance ◽  
Proportional Controller ◽  
Flight Measurements

In closed-loop systems, sensor feedback delays may have disastrous implications for performance and stability. Flies have evolved multiple specializations to reduce this latency, but the fastest feedback during flight involves a delay that is still significant on the timescale of body dynamics. We explored the effect of sensor delay on flight stability and performance for yaw turns using a dynamically scaled robotic model of the fruitfly, Drosophila . The robot was equipped with a real-time feedback system that performed active turns in response to measured torque about the functional yaw axis. We performed system response experiments for a proportional controller in yaw velocity for a range of feedback delays, similar in dimensionless timescale to those experienced by a fly. The results show a fundamental trade-off between sensor delay and permissible feedback gain, and suggest that fast mechanosensory feedback in flies, and most probably in other insects, provide a source of active damping which compliments that contributed by passive effects. Presented in the context of these findings, a control architecture whereby a haltere-mediated inner-loop proportional controller provides damping for slower visually mediated feedback is consistent with tethered-flight measurements, free-flight observations and engineering design principles.

Hypersonic viscous effects on free-flight slender cones

AIAA Journal ◽  
1965 ◽  
Vol 3 (8) ◽  
pp. 1391-1400 ◽  
Author(s):  
BAIN DAYMAN
Keyword(s):  
Free Flight ◽  
Viscous Effects
Sign in / Sign up

Export Citation Format

Share Document