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UID:0-531@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20150202T163000

DTEND;TZID=Asia/Jerusalem:20150202T173000

DTSTAMP:20230603T193429Z

URL:https://aerospace.technion.ac.il/events/rock-and-roll-how-flies-contro
 l-their-flight/

SUMMARY:Rock and Roll – How flies control their flight
DESCRIPTION:Lecturer:Dr. Tsevi Beatus\n Faculty:The Physics Department\,\n 
 Institute:Cornell University\, USA\n Location:Classroom 165\, ground floor
 \, Library\, Aerospace Eng.\n Zoom: \n Abstract: \n Details: \n Flying ins
 ects can perform a wide array of extreme aerial maneuvers with exquisite a
 ccuracy and robustness\, outmaneuvering any man-made flying device. As a p
 hysical system\, a flapping insect is strongly nonlinear with fast-growing
  mechanical instabilities that must be controlled to allow flight. Hence\,
  similar to balancing a stick on one's fingertip\, flapping flight is a de
 licate balancing act made possible only by ever-present\, fast corrective 
 actions. Understanding the underlying mechanisms of insect flight is a maj
 or challenge\, since this graceful behavior is highly coupled to complex f
 luid flows and arises from the concerted operation of physiological functi
 ons across multiple length and time scales. As such\, Insect flight resear
 ch involves basic concepts from nonlinear dynamics\, fluid mechanics\, neu
 robiology and control theory\, and has direct application to the developme
 nt of small flapping robots.\nHere we show how flies control their rotatio
 nal degrees of freedom: yaw\, pitch and roll. We focus on their body roll 
 angle\, which is unstable and most sensitive degree of freedom. We glue a 
 magnet to each fly and apply a short magnetic pulse that rolls it in mid-a
 ir. Fast video shows that flies fully correct for perturbations of up to 1
 00o within 30±7ms. The roll correction maneuver consists of a stroke-ampl
 itude asymmetry that is well described by a linear PI controller. For more
  aggressive perturbations\, we show evidence for nonlinear and hierarchica
 l control mechanisms. Flies respond to roll perturbations within a single 
 wing-beat\, or 5ms\, making this correction reflex one of the fastest in t
 he animal kingdom. See image  here.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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