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Bioinspiration & Biomimetics

Zhuoyu Zhou, Rajat Mittal
Incompressible flow simulations are used to study the swimming of a Spanish Dancer (Hexabranchus sanguineus), a soft-bodied invertebrate marine gastropod that swims by combining body pitching with undulations of its large mantle. A simple model based on a field video is employed as the basis for the model and coupling of the flow with the body acceleration enables us to examine the free swimming of this animal. Simulations indicate propulsive efficiencies of up to about 57% and terminal swimming speeds of 1...
October 16, 2017: Bioinspiration & Biomimetics
Chong Shen, Mao Sun
In this paper, we analyzed the body and wing kinematics and mechanics in fruit flies' landings on a vertical pole. By high-speed video techniques and CFD method, we exhibited the detailed process of landing as follows. A fruit fly first decelerates and enters a near-hover state approximately 25 mm away from the vertical pole, then starts approaching the pole in acceleration till one of its front-legs touches the pole (touchdown). Just before touchdown, the fly's acceleration is around 6 ms<sup>-2</sup>; at touchdown, it experiences an almost instant deceleration of several g (gravitational acceleration), approximately all of which results from the leg force...
October 13, 2017: Bioinspiration & Biomimetics
Marta Espina Palanco, Nils Skovgaard, Jesper Søndergaard Hansen, Kirstine Berg-Sorensen, Claus Helix-Nielsen
The barrier properties of cellular membranes are increasingly attracting attention as a source of inspiration for designing biomimetic membranes. The broad range of potential technological applications makes the use of lipid and lately also polymeric materials a popular choice for constructing biomimetic membranes, where the barrier properties can be controlled by the composition of the membrane constituent elements. Here we investigate the membrane properties reported by the light-induced proton pumping activity of bacteriorhodopsin (bR) reconstituted in three vesicle systems of different membrane composition...
October 11, 2017: Bioinspiration & Biomimetics
Marta Scali, Tim Philipp Pusch, Paul Breedveld, D Dodou
Flexible steerable needles have the potential to allow surgeons to reach deep targets inside the human body with higher accuracy than rigid needles do. Furthermore, by maneuvering around critical anatomical structures, steerable needles could limit the risk of tissue damage. However, the design of a thin needle (e.g., diameter under 2 mm) with a multi-direction steering mechanism is challenging. The goal of this paper is to outline the design and experimental evaluation of a biologically inspired needle with a diameter under 2 mm that advances through straight and curved trajectories in a soft substrate without being pushed, without buckling, and without the need of axial rotation...
October 11, 2017: Bioinspiration & Biomimetics
Marcello Calisti, Cecilia Laschi
This paper presents the self-stabilisation features of a hopping gait during underwater legged locomotion. We used a bio-inspired fundamental model of this gait, the underwater spring-loaded inverted pendulum model, to numerically derive quantitative (dimension of the basin of attraction, Floquet multipliers, mean horizontal speed) and qualitative (shape of the basin) features which characterise the self-stability of the system. Furthermore, we compared the results obtained with a terrestrial self-stable running model (i...
October 4, 2017: Bioinspiration & Biomimetics
Leo Cazenille, Bertrand Collignon, Yohann Chemtob, Frank Bonnet, Alexey Gribovskiy, Francesco Mondada, Nicolas Bredeche, José Halloy
Biomimetic robots are promising tools in animal behavioural studies. If they are socially integrated in a groupof animals, they can produce calibrated social stimuli to test the animal responses. However, the design of suchsocial robots is challenging as it involves both a luring capability including appropriate robot behaviours, and theacceptation of the robots by the animals as social companions. Here, we investigate the integration of a biomimeticrobotic lure driven by biomimetic behavioural models into a group of zebrafish (Danio rerio)...
September 27, 2017: Bioinspiration & Biomimetics
Xingwen Zheng, Chen Wang, Ruifeng Fan, Guangming Xie
Lateral line system (LLS) is a mechanoreceptive organ system with which fish and aquatic amphibians can effectively sense the surrounding flow field. The reverse Kármán vortex street (KVS), known as a typical thrust-producing wake, is commonly observed in fish-like locomotion and is known to be generated by fish tail. The vortex street generally reflects the motion information of fish. Fish can use LLS to detect such vortex streets generated by its neighboring fish, thus sensing its own states and the states of its neighbors in fish school...
September 26, 2017: Bioinspiration & Biomimetics
Hisashi Ishihara, Nobuyuki Ota, Minoru Asada
It is quite difficult for android robots to replicate the numerous and various types of human facial expressions owing to limitations in terms of space, mechanisms, and materials. This situation could be improved with greater knowledge regarding these expressions and their deformation rules, i.e., by using the biomimetic approach. In a previous study, we investigated 16 facial deformation patterns and found that each facial point moves almost only in its own principal direction and different deformation patterns are created with different combinations of moving lengths...
September 26, 2017: Bioinspiration & Biomimetics
Matthew D Perkins, Dane Elles, George Badlissi, Amin Mivehchi, Jason Dahl, Stephen Licht
In this paper, we investigate the effect of operating near a solid boundary on the forces produced by harmonically oscillating thrust generating foils. A rolling and pitching foil was towed in a freshwater tank in a series of experiments with varying kinematics. Hydrodynamic forces and torques were measured in the free stream and at varying distances from a solid boundary, and changes in mean lift and thrust were found when the foil approached the boundary. The magnitude of this ground effect exhibited a strong nonlinear dependence on the distance between the foil and the boundary...
September 4, 2017: Bioinspiration & Biomimetics
Jonas Wolff, David Wells, Chris Reid, Sean John Blamires
Biomimetics, the transfer of functional principles from living systems into product designs, is increasingly being utilized by engineers. Nevertheless, recurring problems must be overcome if it is to avoid becoming a short-lived fad. Here we assess the efficiency and suitability of methods typically employed by examining three flagship examples of biomimetic design approaches from different disciplines: (1) the creation of gecko-inspired adhesives; (2) the synthesis of spider silk, and (3) the derivation of computer algorithms from natural self-organizing systems...
August 18, 2017: Bioinspiration & Biomimetics
Christopher A Daily-Diamond, Alyssa Novelia, Oliver O'Reilly
With the goal of robustly designing and fabricating a soft robot based on a caterpillar featuring shape memory alloy (SMA) actuators, analytical and numerical models for a soft robot were created based on the forward crawling motion of the Manduca sexta caterpillar. The analytical model features a rod theory and the mechanics of undulation were analyzed using a motion pattern based on the "Witch of Agnesi" curve. Complementing these models, experiments on a SMA actuator sample were performed in order to determine its flexural rigidity and curvature as a function of the actuation voltage...
August 7, 2017: Bioinspiration & Biomimetics
Biao Geng, Qian Xue, Xudong Zheng, Geng Liu, Yan Ren, Haibo Dong
In this study, the unsteady flow and acoustic characteristics of a three-dimensional (3D) flapping wing model of Tibicen linnei cicada at forward flight condition are numerically investigated. A single cicada wing is modelled as a membrane with prescribed motion reconstructed from high-speed videos of a live insect. The numerical solution takes a hydrodynamic/acoustic splitting approach: the flow field is solved with an incompressible Navier-Stokes flow solver based on immersed boundary method and the acoustic field is solved with linearized perturbed compressible equations (LPCEs)...
August 4, 2017: Bioinspiration & Biomimetics
Michael M Porter, Nakul Ravikumar
Seahorses and pipehorses evolved at least two independent strategies for tail grasping, despite being armored with a heavy body plating. To help explain mechanical trade-offs associated with the different designs, we created a "family" of 3D-printed models that mimic variations in the presence and size of their armored plates. We measured the performance of the biomimetic proxies across seven mechanical metrics, representative of their protective and prehensile capacities. Our results show that the models mimicking the tails of seahorses are the best all-around performers, while those of the distal-most, prehensile region of pipehorses are more flexible, but less protected...
July 27, 2017: Bioinspiration & Biomimetics
Avishai Beck, Valentin Zaitsev, Uri Ben Hanan, Gabor Kosa, Amir Ayali, Avi Weiss
Bio-inspired robotics is a promising design strategy for mobile robots. Jumping is an energy efficient locomotion gait for traversing difficult terrain. Inspired by the jumping and flying behavior of the desert locust, we have recently developed a miniature jumping robot that can jump over 3.5 m high. However, much like the non-adult locust, it rotates while in the air and lands uncontrollably. Inspired by the winged adult locust, we have added spreading wings and a tail to the jumper. After the robot leaps, at the apex of the trajectory, the wings unfold and it glides to the ground...
October 16, 2017: Bioinspiration & Biomimetics
Farid Jafari, Sevak Tahmasian, Shane D Ross, John J Socha
Flying snakes of genus Chrysopelea possess a highly dynamic gliding behavior, which is dominated by an undulation in the form of lateral waves sent posteriorly down the body. The resulting high-amplitude periodic variations in the distribution of mass and aerodynamic forces have been hypothesized to contribute to the stability of the snake's gliding trajectory. However, a previous 2D analysis in the longitudinal plane failed to reveal a significant effect of undulation on the stability in the pitch direction...
October 16, 2017: Bioinspiration & Biomimetics
Aidan Rinehart, Vikram Shyam, Wei Zhang
Seals with beaded whiskers-the majority of true seals (Phocids)-are able to trace even minute disturbance caused by prey fish in the ambient flow using only sensory input from their whiskers. The unique three-dimensional undulating morphology of seal whiskers has been associated with their capability of suppressing vortex-induced vibration and reducing drag. The exceptional hydrodynamic traits of seal whiskers are of great interest in renovating the design of aero-propulsion flow components and high-sensitivity flow sensors...
October 16, 2017: Bioinspiration & Biomimetics
Lorenzo Vannucci, Egidio Falotico, Silvia Tolu, Vito Cacucciolo, Paolo Dario, Henrik Hautop Lund, Cecilia Laschi
Gaze stabilization is essential for clear vision; it is the combined effect of two reflexes relying on vestibular inputs: the vestibulocollic reflex (VCR), which stabilizes the head in space and the vestibulo-ocular reflex (VOR), which stabilizes the visual axis to minimize retinal image motion. The VOR works in conjunction with the opto-kinetic reflex (OKR), which is a visual feedback mechanism that allows the eye to move at the same speed as the observed scene. Together they keep the image stationary on the retina...
October 16, 2017: Bioinspiration & Biomimetics
Hongbin Fang, Yetong Zhang, K W Wang
Inspired by the morphology characteristics of the earthworms and the excellent deformability of origami structures, this research creates a novel earthworm-like locomotion robot through exploiting the origami techniques. In this innovation, appropriate actuation mechanisms are incorporated with origami ball structures into the earthworm-like robot 'body', and the earthworm's locomotion mechanism is mimicked to develop a gait generator as the robot 'centralized controller'. The origami ball, which is a periodic repetition of waterbomb units, could output significant bidirectional (axial and radial) deformations in an antagonistic way similar to the earthworm's body segment...
October 16, 2017: Bioinspiration & Biomimetics
Thomas George Thuruthel, Egidio Falotico, Federico Renda, Cecilia Laschi
The soft capabilities of biological appendages like the arms of Octopus vulgaris and elephants' trunks have inspired roboticists to develop their robotic equivalents. Although there have been considerable efforts to replicate their morphology and behavior patterns, we are still lagging behind in replicating the dexterity and efficiency of these biological systems. This is mostly due to the lack of development and application of dynamic controllers on these robots which could exploit the morphological properties that a soft-bodied manipulator possesses...
October 16, 2017: Bioinspiration & Biomimetics
Andrés Díaz Lantada, Stefan Hengsbach, Klaus Bade
In this study we present the combination of a math-based design strategy with direct laser writing as high-precision technology for promoting solid free-form fabrication of multi-scale biomimetic surfaces. Results show a remarkable control of surface topography and wettability properties. Different examples of surfaces inspired on the lotus leaf, which to our knowledge are obtained for the first time following a computer-aided design with this degree of precision, are presented. Design and manufacturing strategies towards microfluidic systems whose fluid driving capabilities are obtained just by promoting a design-controlled wettability of their surfaces, are also discussed and illustrated by means of conceptual proofs...
October 16, 2017: Bioinspiration & Biomimetics
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