Springs And Wings
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On The Physiology Of Wings
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Author : James Bell Pettigrew
language : en
Publisher:
Release Date : 1871
On The Physiology Of Wings written by James Bell Pettigrew and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1871 with Animal flight categories.
The Aeronautical Journal
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Author :
language : en
Publisher:
Release Date : 1897
The Aeronautical Journal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1897 with Aeronautics categories.
Journal Of The Royal Aeronautical Society
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Author :
language : en
Publisher:
Release Date : 1897
Journal Of The Royal Aeronautical Society written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1897 with Aeronautics categories.
English Patents Of Inventions Specifications
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Author :
language : en
Publisher:
Release Date :
English Patents Of Inventions Specifications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
The Architectural Review And American Builders Journal
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Author :
language : en
Publisher:
Release Date : 1870
The Architectural Review And American Builders Journal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1870 with Architecture categories.
Tests Of Nacelle Propeller Combinations In Various Positions With Reference To Wings
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Author : Donald H. Wood
language : en
Publisher:
Release Date : 1933
Tests Of Nacelle Propeller Combinations In Various Positions With Reference To Wings written by Donald H. Wood and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1933 with Aerofoils categories.
Springs And Wings
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Author : James Lynch
language : en
Publisher:
Release Date : 2023
Springs And Wings written by James Lynch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
In the last decade, roboticists have had significant success building centimeter-scale flapping wing micro aerial vehicles (FWMAVs) inspired by the flight of insects. Evidence suggests that insects store and release energy in the thoracic exoskeleton to improve energy efficiency by flapping at resonance. Insect-inspired micro flying robots have also leveraged resonance to improve efficiency, but they have discovered that operating at the resonant frequency leads to issues with flight control. This research seeks to investigate the roles that elasticity, aerodynamics, and muscle dynamics play in the emergent dynamics of flapping flight by studying elastic flapping spring-wing systems using dynamically-scaled robophysical models of spring-wings. Studying the dynamics of a robot with comparable features enables the validation of models from biology that are otherwise difficult to test in living insects, the generation of new hypotheses, and the development of novel FWMAV designs. In Chapter 1, the spring-wing system is characterized as a nonlinear spring-mass-damper model. A robophysical model validates that such systems gain energetic benefits from operating at resonance, but reveals that the benefit scales with an underappreciated dimensionless ratio of inertial to aerodynamic forces, the Weis-Fogh number. We show through dimensional analysis that any real system, living or robotic, must balance the mechanical advantage gained from operating at resonance with diminishing returns in efficiency. Chapter 2 further explores the impact of the Weis-Fogh number on flapping dynamics, showing that responsiveness to control inputs is reduced and resistance to environmental perturbations is increased as the dimensionless ratio increases. Together with calculations of Weis-Fogh number in insects, these studies illustrate tradeoffs that drive evolution of resonant flight in nature and guide development of future FWMAVs with elastic energy exchange. In the second half of the thesis, muscle dynamics are introduced in the form of a simplified model of self-excited asynchronous insect muscle. In Chapter 3, a linear feedback model adapted from experiments on insect flight muscle is developed and integrated with the spring-wing model, producing a system that generates steady flapping via limit-cycle oscillations despite the absence of periodic control inputs. The model is explored analytically, in simulation, and via implementation on the robotic spring-wing. Novel dynamic characteristics that enable adaptation to damage and passive response to wing collisions are described. Chapter 4 leverages the asynchronous feedback model as part of an interdisciplinary study of the evolution of asynchronous muscle. Phylogenetic analysis, direct measurement of insect muscle dynamics, and experiments on the robophysical system show that evolutionary transitions between periodically forced and self-excited insect muscle were likely made possible by a "bridge" in the dynamic parameter space that could be traversed under specific conditions. The asynchronous spring-wing model provides new insight into the flight and evolution of some of the most agile insects in nature, and presents a novel adaptive control scheme for future FWMAVs.
The Auk
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Author :
language : en
Publisher:
Release Date : 1890
The Auk written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1890 with Birds categories.
Swallows On The Wing O Er Garden Springs Of Delight
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Author : William Furniss
language : en
Publisher:
Release Date : 1866
Swallows On The Wing O Er Garden Springs Of Delight written by William Furniss and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1866 with categories.
Wings Springs And Other Neat Things
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Author : Cynthia MacGregor
language : en
Publisher:
Release Date : 2017-08-31
Wings Springs And Other Neat Things written by Cynthia MacGregor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-31 with categories.
A charming piece of whimsy, this little book speculates on what it would be like to have wings, or springs on your feet to enable you to leap to your destination. What child hasn't wondered what it would be like to be invisible on demand or immune from a rainstorm? What's your fantasy? With illustrations from Fifi Lavender, this is a book to make you smile.