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Bioinspiration & Biomimetics

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https://www.readbyqxmd.com/read/29671409/flow-interactions-of-two-and-three-dimensional-networked-bio-inspired-control-elements-in-an-in-line-arrangement
#1
Melike Kurt, Keith Moored
We present experiments that examine the modes of interaction, the collective performance and the role of three-dimensionality in two pitching propulsors in an in-line arrangement. Both two-dimensional foils and three-dimensional rectangular wings of $AR = 2$ are examined. \kwm{In contrast to previous work, two interaction modes distinguished as the coherent and branched wake modes are not observed to be directly linked to the propulsive efficiency, although they are linked to peak thrust performance and minimum power consumption as previously described \cite[]{boschitsch2014propulsive}...
April 19, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29652250/design-and-modelling-of-an-engineered-bacteria-based-pressure-sensitive-soil
#2
Martyn Dade-Robertson, Helen Mitrani, Javier Rodriguez Corral, Meng Zhang, Luis Hernan, Aurelie Guyet, Anil Wipat
In this paper, we describe the first steps in the design of a synthetic biological system based on the use of genetically modified bacteria to detect elevated pressures in soils and respond by cementing soil particles. Such a system might, for example, enable a self- constructed foundation to form in response to load using engineered bacteria which could be seeded and grown in the soils. This process would reduce the need for large-scale excavations and may be the basis for a new generation of self-assembling and responsive bio-based materials...
April 13, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29648545/enhancement-of-aerodynamic-performance-of-a-heaving-airfoil-using-synthetic-jet-based-active-flow-control
#3
Chenglei Wang, Hui Tang
In this study, we explore the use of synthetic jet (SJ) in manipulating the vortices around a rigid heaving airfoil, so as to enhance its aerodynamic performance. The airfoil heaves at two fixed pitching angles, with the Strouhal number, reduced frequency and Reynolds number chosen as St=0.3, k=0.25 and Re=100, respectively, all falling in the ranges for natural flyers. As such, the vortex force plays a dominant role in determining the airfoil's aerodynamic performance. A pair of in-phase SJs is implemented on the airfoil's upper and lower surfaces, operating with the same strength but in opposite directions...
April 12, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29629711/man-made-flows-from-a-fish-s-perspective-autonomous-classification-of-turbulent-fishway-flows-with-field-data-collected-using-an-artificial-lateral-line
#4
Jeffrey Andrew Tuhtan, Juan Francisco Fuentes-Perez, Gert Toming, Matthias Schneider, Richard Schwarzenberger, Martin Schletterer, Maarja Kruusmaa
The lateral line system provides fish with advanced mechanoreception over a wide range of flow conditions. Inspired by the abilities of their biological counterparts, artificial lateral lines have been developed and tested exclusively under laboratory settings. Motivated by the lack of flow measurements taken in the field which consider fluid-body interactions, we built a fish-shaped lateral line probe. The device is outfitted with 11 high-speed (2.5 kHz) time-synchronized pressure transducers, and designed to capture and classify flows in fish passage structures...
April 9, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29620530/genetic-engineered-color-silk-fabrication-of-a-photonics-material-through-a-bioassisted-technology
#5
Katsuhiko Shimizu
Silk produced by the silkworm Bombyx mori is an attractive material because of its luster, smooth and soft texture, conspicuous mechanical strength, good biocompatibility, slow biodegradation, and carbon neutral synthesis. Silkworms have been domesticated and bred for production of better quality and quantity of silk, resulting in the development of sericulture and the textile industry. Silk is generally white, so dyeing is required to obtain colored fiber. However, the dyeing process involves harsh conditions and generates a large volume of waste water, which have environmentally and economically negative impacts...
April 5, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29595522/armours-for-soft-bodies-how-far-can-bioinspiration-take-us
#6
Zachary White, Franck Vernerey
The development of armour is as old as the dawn of civilization. Early man looked to natural structures to harvest or replicate for protection, leaning on millennia of evolutionary developments in natural protection. Since the advent of more modern weaponry, Armor development has seemingly been driven more by materials research than bio-inspiration. However, parallels can still be drawn between modern bullet-protective armours and natural defensive structures. Soft armour for handgun and fragmentation threats can be likened to mammalian skin, and similarly, hard armour can be compared with exoskeletons and turtle shells...
March 29, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29557347/hovering-efficiency-comparison-of-rotary-and-flapping-flight-for-a-rigid-and-rectangular-wings-via-dimensionless-multi-objective-optimization
#7
Yagiz Efe Bayiz, Mohammad Ghanaatpishe, Hosam Fathy, Bo Cheng
In this work, a multi-objective optimization framework is developed for optimizing low-Reynolds number (Re) hovering flight. This framework is then applied to compare the efficiency of rigid revolving and flapping wings with rectangular shape under varying Re and Rossby number (Ro, or aspect ratio). The proposed framework is capable of generating sets of optimal solutions and Pareto fronts for maximizing lift coefficient and minimizing power coefficient in dimensionless space, which explicitly reveal the trade off between lift generation and power consumption...
March 20, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29557345/transition-and-formation-of-the-torque-pattern-of-undulatory-locomotion-in-resistive-force-dominated-media
#8
Tingyu Ming, Yang Ding
In undulatory locomotion, torques along the body are required to overcome external forces from the environment and bend the body. Such torques are usually generated by muscles in animals and closely related to muscle activations. In previous studies, researchers observed a single traveling wave pattern of the torque or muscle activation, but the formation of the torque pattern is still not well understood. Using a resistive force theory model, we find that the torque from external resistive forces has a traveling wave pattern with a decreasing speed normalized by the curvature speed as the wave number (the number of wavelengths on the locomotor's body) increases from 0...
March 20, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29547135/moth-eye-inspired-anti-reflective-surfaces-for-improved-ir-optical-systems-visible-leds-fabricated-with-colloidal-lithography-and-etching
#9
Lesley W Chan, Daniel E Morse, Michael J Gordon
Near- and sub-wavelength photonic structures are used by numerous organisms (e.g., insects, cephalopods, fish, birds) to create vivid and often dynamically-tunable colors, as well as create, manipulate, or capture light for vision, communication, crypsis, photosynthesis, and defense. This review introduces the physics of moth eye (ME)-like, biomimetic nanostructures and discusses their application to reduce optical losses and improve efficiency of various optoelectronic devices, including photodetectors, photovoltaics, imagers, and light emitting diodes...
March 16, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29537389/attitude-control-system-for-a-lightweight-flapping-wing-mav
#10
Sjoerd Tijmons, Matěj Karásek, G C H E de Croon
Robust attitude control is an essential aspect of research on autonomous flight of flapping wing Micro Air Vehicles. The mechanical solutions by which the necessary control moments are realised come at the price of extra weight and possible loss of aerodynamic efficiency. Stable flight of these vehicles has been shown by several designs using a conventional tail, but also by tailless designs that use active control of the wings. In this study a control mechanism is proposed that provides active control over the wings...
March 14, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29508773/locomotion-of-arthropods-in-aquatic-environment-and-their-applications-in-robotics
#11
Bokeon Kwak, Joonbum Bae
Many bio-inspired robots have been developed so far after careful investigation about animals' locomotion. To successfully apply the locomotion of nature counterparts to robots for efficient and improved mobility, it is essential to understand their principle. Although a lot of research have studied either animals' locomotion or bio-inspired robots, there was only a few attempts to broadly review both of them in a single article. Among millions of animal species, this article reviewed various forms of aquatic locomotion in arthropods including relevant bio-inspired robots...
March 6, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29493535/design-and-evaluation-of-a-deformable-wing-configuration-for-economical-hovering-flight-of-an-insect-like-tailless-flying-robot
#12
Hoang Vu Phan, Hoon Cheol Park
Studies on wing kinematics indicate that flapping insect wings operate at higher angles of attack (AoAs) than conventional rotary wings. Thus, effectively flying an insect-like flapping-wing micro air vehicle (FW-MAV) requires appropriate wing design for achieving low power consumption and high force generation. Even though theoretical studies can be performed to identify appropriate geometric AoAs for a wing for achieving efficient hovering flight, designing an actual wing by implementing these angles into a real flying robot is challenging...
March 1, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29469810/design-and-analysis-of-coiled-fiber-reinforced-soft-pneumatic-actuator
#13
Gaurav Singh, Chenzhang Xiao, Elizabeth T Hsiao-Wecksler, Girish Krishnan
Fiber Reinforced Elastomeric Enclosures (FREEs) are soft pneumatic actuators that can contract and generate forces upon pressurization. Typical engineering applications utilize FREEs in its straight cylindrical configuration, and derive actuation displacement and forces from its ends. However, there are several instances in nature, such as an elephant trunk, snake, and grapevine tendril, where a spiral configuration of muscle systems is used for gripping, thereby establishing a mechanical connection with uniform force distribution...
February 22, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29466251/kinematics-and-dynamics-of-the-auto-rotation-of-a-model-winged-seed
#14
Gonzalo Arranz, Manuel Moriche, Markus Uhlmann, Oscar Flores, Manuel García-Villalba
Numerical simulations of the auto-rotation of a model winged seed are presented. The calculations are performed by solving simultaneously the Navier-Stokes equations for the flow surrounding the seed and the rigid-body equations for the motion of the seed. The Reynolds number based on the descent speed and a characteristic chord length is varied in the range 80 - 240. Within this range, the seed attains an asymptotic state with finite amplitude auto-rotation, while for smaller values of the Reynolds number no auto-rotation is observed...
February 21, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29461251/axial-propulsion-with-flapping-and-rotating-wings-a-comparison-of-potential-efficiency
#15
Christopher Matthew Kroninger
Interest in biological locomotion and what advantages the principles governing it might offer in the design of manmade vehicles prompts one to consider the power requirements of flapping relative to rotary propulsion. The amount of work performed on the fluid surrounding a thrusting surface (wing or blade) is reflected in the kinetic energy of the wake. Consideration of the energy in the wake is sufficient to define absolute minimum limitations on the power requirement to generate a particular thrust. This work applies wake solutions to compare the minimum inviscid propulsive power requirement of wings flapping and in rotation at wing loading conditions reflective of hover through a state of lightly-loaded cruise...
February 20, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29447117/on-the-high-lift-characteristics-of-a-bio-inspired-slotted-delta-wing
#16
Kaley Ann Sheppard, David Emory Rival
A bio-inspired, slotted delta wing was abstracted from a multi-vane propulsor geometry ubiquitous in nature, and analysed to investigate aerodynamic performance during acceleratory and steady-state motions. Evolutionary convergence of slotted geometries in nature suggests an aerodynamic benefit in manoeuvrability, as exemplified in the fins and wings of a broad range of extant and extinct swimmers and flyers, respectively. Through direct force measurements and stereoscopic particle image velocimetry, it was found that the abstracted, slotted geometry exhibited a region of steady-state lift and drag enhancement at angles of attack greater than 25° when compared to a reference profile based on a delta-wing plate...
February 15, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29443002/photonic-crystal-micro-pixelation-and-additive-color-mixing-in-weevil-scales
#17
Ramneet K Nagi, Danielle E Montanari, Michael Bartl
The origin of the brilliant near angle-independent coloration of the weevil Eupholus chevrolati was investigated by a combination of optical and electron microscopy tools, photonic band structure calculations, and color mixing analysis. Optical microscopy and scanning micro-spectroscopy revealed the presence of micrometer-sized red, yellow, green, and blue reflective pixels covering the entire exoskeleton of the weevil. Scanning electron microscopy in combination with focused ion beam milling showed that each micro-pixel consisted of a diamond-based photonic crystal structure and the different reflective colors were the result of different orientations of the photonic crystal...
February 14, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29405128/designing-polymer-gels-and-composites-that-undergo-bio-inspired-phototactic-reconfiguration-and-motion
#18
Olga Kuksenok, Awaneesh Singh, Anna Balazs
Inspired by the adaptive behavior of photo-responsive biological organisms, we use theory and simulation to design polymer gels and composites that can be dynamically reconfigured and driven to move with the application of light. We focus on gels formed from poly(N-isopropylacrylamide) (PNIPAAm) and functionalized with spirobenzopyran (SP) chromophores, which become hydrophobic under blue light in acidic aqueous solution. We demonstrate that these gels can be patterned remotely and reversibly by illuminating the samples through photomasks and thus, "molded" into a variety of shapes with features sizes that are on the sub-mm length scale...
February 6, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29388556/bioinspired-wingtip-devices-a-pathway-to-improve-aerodynamic-performance-during-low-reynolds-number-flight
#19
Michael Lynch, Boris Mandadzhiev, Aimy Wissa
Birds are highly capable and maneuverable fliers, traits not currently shared with current small unmanned aerial vehicles. They are able to achieve these flight capabilities by adapting the shape of their wings during flight in a variety of complex manners. One feature of bird wings, the primary feathers, separate to form wingtip gaps at the distal end of the wing. This paper presents bio-inspired wingtip devices with varying wingtip gap sizes, defined as the chordwise distance between wingtip devices, for operation in low Reynolds number conditions of Re = 100,000, where many bird species operate...
February 1, 2018: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/29372888/effects-of-flexibility-and-aspect-ratio-on-the-aerodynamic-performance-of-flapping-wings
#20
Junjiang Fu, Xiaohui Liu, Wei Shyy, Huihe Qiu
In the current study, we experimentally investigated the flexibility effects on the aerodynamic performance of flapping wings and the correlation with aspect ratio at angle of attack α = 45<sup>o</sup>. The Reynolds number based on the chord length and the wing tip velocity is maintained at Re = 5.3x10<sup>3</sup>. Our result for compliant wings with an aspect ratio of 4 shows that wing flexibility can offer improved aerodynamic performance compared to that of a rigid wing. Flexible wings are found to offer higher lift-to-drag ratios; in particular, there is significant reduction in drag with little compromise in lift...
January 26, 2018: Bioinspiration & Biomimetics
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