Closure to “Discussion of ‘A Review of Propulsion, Power, and Control Architectures for Insect-Scale Flapping Wing Vehicles’” (Helbling, E. F., and Wood, R. J., 2018, ASME Appl. Mech. Rev., 70(1), p. 010801)

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
E. Farrell Helbling ◽  
Robert J. Wood
Keyword(s):  
Flapping Wing ◽  
Power And Control ◽  
And Control ◽  
Propulsion Power

Discussion of “A Review of Propulsion, Power, and Control Architectures for Insect-Scale Flapping Wing Vehicles” by E. F. Helbling and R. J. Wood (Helbling, E. F., and Wood, R. J., 2018, ASME Appl. Mech. Rev., 70(1), p. 010801)

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Satyandra K. Gupta
Keyword(s):  
Flapping Wing ◽  
Point Of View ◽  
Small Scale ◽  
Flying Insects ◽  
Power And Control ◽  
Significant Interest ◽  
Challenges And Opportunities ◽  
And Control ◽  
Propulsion Power ◽  
Remarkable Progress

Flying insects exhibit truly remarkable capabilities. There has been significant interest in developing small-scale flying robots by taking inspiration from flying insects. The paper by Helbling and Wood reports remarkable progress made by the research community in realizing insect-scale flapping wing vehicles and identifies research challenges and opportunities. This discussion builds upon their paper and examines the potential of insect-scale flapping wing flight from an application point of view. It summarizes requirements and mention implications of these requirements on propulsion, power, and control architecture.

scholarly journals Hawkmoths use wingstroke-to-wingstroke frequency modulation for aerial recovery to vortex ring perturbations

2020 ◽  
Author(s):  
Jeff Gau ◽  
Ryan Gemilere ◽  
James Lynch ◽  
Nick Gravish ◽  
Simon Sponberg ◽  
...  
Keyword(s):  
Frequency Modulation ◽  
High Speed ◽  
Insect Flight ◽  
Control Strategies ◽  
Flapping Wing ◽  
Wingbeat Frequency ◽  
Mechanical Constraints ◽  
Power And Control ◽  
Long Time ◽  
And Control

AbstractCentimeter-scale fliers that combine wings with springy elements must contend with the high power requirements and mechanical constraints of flapping wing flight. Insects utilize elastic energy exchange to reduce the inertial costs of flapping wing flight and potentially match wingbeat frequencies to a mechanical resonance. Flying at resonance may be energetically favorable under steady conditions, but it is difficult to modulate the frequency of a resonant system. Evidence suggests that insects utilize frequency modulation over long time scales to adjust aerodynamic forces, but it remains an open question the extent to which insects can modulate frequency on the wingstroke-to-wingstroke timescale. If wingbeat frequencies deviate from resonance, the musculature must work against the elastic flight system, thereby potentially increasing energetic costs. To assess how insects address the simultaneous needs for power and control, we tested the capacity for wingstroke-to-wingstroke wingbeat frequency modulation by perturbing free hovering Manduca sexta with vortex rings while recording high-speed video at 2000 fps. Because hawkmoth flight muscles are synchronous, there is at least the potential for the nervous system to modulate frequency on each wingstroke. We observed ± 16% wingbeat frequency modulation in just a few wing strokes. Via instantaneous phase analysis of wing kinematics, we found that over 85% of perturbation responses required active changes in motor input frequency. Unlike their robotic counterparts that explicitly abdicate frequency modulation in favor of energy efficiency, we find that wingstroke-to-wingstroke frequency modulation is an underappreciated control strategies that complements other strategies for maneuverability and stability in insect flight.

scholarly journals A Review of Propulsion, Power, and Control Architectures for Insect-Scale Flapping-Wing Vehicles

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
E. Farrell Helbling ◽  
Robert J. Wood
Keyword(s):  
Integrated Circuit ◽  
Micro Air Vehicles ◽  
High Energy ◽  
Flapping Wing ◽  
High Energy Density ◽  
Small Scale ◽  
Flying Insects ◽  
Power And Control ◽  
Recent Developments ◽  
And Control

Flying insects are able to navigate complex and highly dynamic environments, can rapidly change their flight speeds and directions, are robust to environmental disturbances, and are capable of long migratory flights. However, flying robots at similar scales have not yet demonstrated these characteristics autonomously. Recent advances in mesoscale manufacturing, novel actuation, control, and custom integrated circuit (IC) design have enabled the design of insect-scale flapping wing micro air vehicles (MAVs). However, there remain numerous constraints to component technologies—for example, scalable high-energy density power storage—that limit their functionality. This paper highlights the recent developments in the design of small-scale flapping wing MAVs, specifically discussing the various power and actuation technologies selected at various vehicle scales as well as the control architecture and avionics onboard the vehicle. We also outline the challenges associated with creating an integrated insect-scale flapping wing MAV.

Power and control: transferring energy when there is work to be done

2005 ◽  
pp. 29-30
Author(s):  
Naveen Sharma ◽  
William Stanley
Keyword(s):  
Power And Control ◽  
And Control

International Human Rights Law and Blockade

2018 ◽  
Author(s):  
Phillip Drew
Keyword(s):  
Human Rights ◽  
International Human Rights Law ◽  
Humanitarian Law ◽  
Human Rights Law ◽  
International Human Rights ◽  
European Court ◽  
Power And Control ◽  
International Human ◽  
Extraterritorial Jurisdiction ◽  
And Control

The years since the beginning of the twenty-first century have seen a significant incursion of international human rights law into the domain that had previously been the within the exclusive purview of international humanitarian law. The expansion of extraterritorial jurisdiction, particularly by the European Court of Human Rights, means that for many states, the exercise of physical power and control over an individual outside their territory may engage the jurisdiction of human rights obligations. Understanding the expansive tendencies of certain human rights tribunals, and the apparent disdain they have for any ambiguity respecting human rights, it is offered that the uncertain nature of the law surrounding humanitarian relief during blockades could leave blockading forces vulnerable to legal challenge under human rights legislation, particularly in cases in which starvation occurs as a result of a blockade.

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