Can added-mass variation act as a thrust force?

Giorgio-Serchi, Francesco; Weymouth, Gabriel

doi:10.1109/oceanse.2017.8084726

Cited by 3 publications

(3 citation statements)

References 12 publications

(14 reference statements)

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“…The value of the thrust has a direct impact on the movement of the squid. Jet momentum flux(predicted by slug model [46]), orifice over-pressure [32] and added mass variation [47][48][49][50] contribute to produce the squid thrust.…”

Section: Thrust Generationmentioning

confidence: 99%

Locomotor transition: how squid jet from water to air

et al. 2020

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The amazing multi-modal locomotion of flying squid helps to achieve fast-speed migration and predator-escape behavior. Observation of flying squid has been rarely reported in recent years, since it is challenging to clearly record the flying squid’s aquatic-aerial locomotion in a marine environment. The existing reports of squid-flying events are rare and merely record the in-air motion. Therefore, the water-air locomotor transition of flying squid is still unknown. This paper proposes the idea of using CFD to simulate the process of the flying squid (Sthenoteuthis oualaniensis (S. oualaniensis)) launching from water into air. The results for the first time reveal the flow field information of squid in launching phase and show the kinematic parameters of flying squid in quantification. Both a trailing jet and pinch-off vortex rings are formed to generate launching thrust, and the formation number L ω /D ω is 5.22, demonstrating that the jet strategy is to produce greater time-averaged thrust rather than higher propulsion efficiency. The results also indicate that the maximum flying speed negatively correlates with the launch angle, indicating that a lower launch angle could result in a larger flying speed for the flying squid to escape. These findings explore the multi-modal locomotion of flying squid from a new perspective, helping to explain the trade-off strategy of water-to-air transition, and further enhance the performance of aquatic-aerial vehicles.

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Section: Thrust Generationmentioning

confidence: 99%

Locomotor transition: how squid jet from water to air

et al. 2020

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“…Nowadays, a broad body of literature exists which addresses the distinctive features of pulsed-jet propulsion. This brings evidence that large viscous [9], [10], [11], [12] and inertial [13], [14] fluid effects are concomitant in making cephalopod-inspired locomotion very effective both as a quasi-steady, sustained swimming mode as well as a shortrange, highly menoeuvreable one, thanks, in part, to their structural flexibility [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Manoeuvring of an aquatic soft robot using thrust-vectoring

Wang

Lidtke

Giorgio-Serchi

et al. 2019

2019 2nd IEEE International Conference on Soft Robotics (RoboSoft)

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Capability of a pulsed-jetting, aquatic soft robot to perform turning manoeuvres by means of a steerable nozzle is investigated experimentally for the first time. Actuation of this robot is based on the periodic conversion of slowly-charged elastic potential energy into fluid kinetic energy, giving rise to a cyclic pulsed-jet resembling the one observed in cephalopods. A steerable nozzle enables the fluid jet to be deflected away from the vehicle axis, thus providing the robot with the unique ability to manoeuvre using thrust-vectoring. This actuation scheme is shown to offer a high degree of control authority when starting from rest, yielding turning radii of the order of half of the body length of the vehicle. The most significant factor affecting efficiency of the turn has been identified to be the fluid momentum losses in the deflected nozzle. This leads, given the current nozzle design, to a distinct optimum nozzle angle of 35 • .

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“…[9][10][11][12][13][14] This sequential inflation and deflation in cephalopods can be attributed to their elastic bodies which function like a mass-spring system. [14][15][16] These naturally occurring mass-spring resonators have been a motivation to design artificial robotic systems that closely imitate the cephalopod-inspired motion. [14] Previously, different fabrication methods (e.g., mold casting, [9] 3-D printing, [10] shape memory alloys, [11] dielectric elastomers, [13] elastic membranes [14] ) have produced microrobotic designs that mimic members of the Cephalopoda family.…”

mentioning

confidence: 99%

CeFlowBot: A Biomimetic Flow‐Driven Microrobot that Navigates under Magneto‐Acoustic Fields

Mohanty

Paul

Matos

et al. 2021

Small

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bacterium, [7] alga [8] ). Since most of the above-described organisms are aquatic, their anatomical features precipitate biomimetic approaches to design new microrobots that imitate efficient swimming motion of such organisms.Within such aquatic creatures, a unique swimming mechanism is demonstrated by organisms (e.g., octopus, squid, cuttlefish) that belong to the Cephalopoda family. The cephalopods exhibit a jet-propulsion phenomenon whereby they sequentially inflate and deflate bodies to pump fluid which imparts the necessary thrust to move forward. [9][10][11][12][13][14] This sequential inflation and deflation in cephalopods can be attributed to their elastic bodies which function like a mass-spring system. [14][15][16] These naturally occurring mass-spring resonators have been a motivation to design artificial robotic systems that closely imitate the cephalopod-inspired motion. [14] Previously, different fabrication methods (e.g., mold casting, [9] 3-D printing, [10] shape memory alloys, [11] dielectric elastomers, [13] elastic membranes [14] ) have produced microrobotic designs that mimic members of the Cephalopoda family. Although the aforementioned fabrication methods closely imitate the anatomy of cephalopods up to centimeter scale, their implementation at micro-and nano-scale can be challenging owing to fabrication constraints. Such precise replication of anatomical features at micro-to nano-scale requires multi-step fabrication processes. [5,[17][18][19][20] Specifically, the synthesis of micro-scale movable components that enable Aquatic organisms within the Cephalopoda family (e.g., octopuses, squids, cuttlefish) exist that draw the surrounding fluid inside their bodies and expel it in a single jet thrust to swim forward. Like cephalopods, several acoustically powered microsystems share a similar process of fluid expulsion which makes them useful as microfluidic pumps in lab-on-a-chip devices. Herein, an array of acoustically resonant bubbles are employed to mimic this pumping phenomenon inside an untethered microrobot called CeFlowBot. CeFlowBot contains an array of vibrating bubbles that pump fluid through its inner body thereby boosting its propulsion. CeFlowBots are later functionalized with magnetic layers and steered under combined influence of magnetic and acoustic fields. Moreover, acoustic power modulation of CeFlowBots is used to grasp nearby objects and release it in the surrounding workspace. The ability of CeFlowBots to navigate remote environments under magnetoacoustic fields and perform targeted manipulation makes such microrobots useful for clinical applications such as targeted drug delivery. Lastly, an ultrasound imaging system is employed to visualize the motion of CeFlowBots which provides means to deploy such microrobots in hard-to-reach environments inaccessible to optical cameras.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.202105829.

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Can added-mass variation act as a thrust force?

Cited by 3 publications

References 12 publications

Locomotor transition: how squid jet from water to air

Locomotor transition: how squid jet from water to air

Manoeuvring of an aquatic soft robot using thrust-vectoring

CeFlowBot: A Biomimetic Flow‐Driven Microrobot that Navigates under Magneto‐Acoustic Fields

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