subject:( Swimming Propulsion)

1. Gomes, Lara Elena. Forças propulsivas durante o movimento de palmateio : contribuições para a natação.

Degree: 2015, Brazil

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Apesar da propulsão na natação não ser ainda completamente compreendida, as forças propulsivas efetivas podem ser verificadas, por exemplo, por meio do modelo de Sanders… (more)

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Apesar da propulsão na natação não ser ainda completamente compreendida, as forças propulsivas efetivas podem ser verificadas, por exemplo, por meio do modelo de Sanders ou pelo teste de nado atado. Esse modelo vem sendo aplicado, embora sem ter sido avaliado de forma aprofundada. Assim, o objetivo geral do presente trabalho foi comparar as forças propulsivas efetivas calculadas com o modelo de Sanders e medidas ao longo de um teste de nado atado. Os objetivos específicos foram: revisar os efeitos das condições instáveis na propulsão na natação a partir de estudos que compararam as condições estáveis e instáveis; comparar a força propulsiva efetiva obtida usando duas áreas, a área projetada da mão e a área da superfície da palma da mão; e comparar a frequência de ciclos, a velocidade, a aceleração, o ângulo de ataque e a amplitude de movimento de ambas as mãos entre as condições atada e livre. Para cada objetivo, geral e específico, foi desenvolvido um estudo. Desse modo, o primeiro compreendeu a revisão sistemática, em que uma busca em bases de dados foi realizada, e somente aqueles que atingissem todos os critérios de elegibilidade foram incluídos. Seis trabalhos que compararam condições estáveis e instáveis usando experimentos físicos ou simulações numéricas foram selecionados. Estes verificaram os efeitos nas forças propulsivas de um ou mais fatores que caracterizam uma condição como instável. Logo, mais pesquisas são necessárias para entender o efeito de cada fator, assim como os efeitos da combinação dos fatores na propulsão. Para o segundo estudo, 13 nadadores executaram um teste de esforço máximo de 30 segundos realizando palmateio, enquanto atados à parede da piscina. A partir dos dados cinemáticos obtidos pela técnica de videogrametria, a força propulsiva efetiva foi estimada com o modelo de Sanders utilizando duas áreas de referência: a área projetada da mão e a área da superfície da palma da mão. A força estimada usando a área da superfície da palma da mão foi aproximadamente 21% maior do que a força estimada usando a área projetada. Considerando esse resultado, associado à literatura, recomenda-se usar a área da superfície da palma da mão no cálculo das forças. No terceiro estudo, a amostra e o teste foram os mesmos do anterior, porém a força propulsiva efetiva, além de ser calculada com o modelo de Sanders usando a área da superfície da palma da mão, também foi medida utilizando uma célula de carga ao longo do teste. Os resultados indicaram que o modelo de Sanders não é adequado para estimar as forças propulsivas, uma vez que a força medida foi 807,7% maior do que a força calculada. Para o último estudo, a amostra foi composta por oito nadadores que executaram o mesmo teste já descrito e um teste de esforço máximo de 25 metros realizando palmateio. Foi notado que há diferenças importantes na velocidade da mão e na amplitude de movimento da mão na direção lateral entre as condições atada e livre e que a condição atada intensifica as assimetrias cinemáticas.

Despite swimming propulsion is still not…

Advisors/Committee Members: Loss, Jefferson Fagundes.

Subjects/Keywords: Natação; Força muscular; Biomecânica; Swimming; Propulsion; Performance; Tethered swimming; Asymmetry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gomes, L. E. (2015). Forças propulsivas durante o movimento de palmateio : contribuições para a natação. (Doctoral Dissertation). Brazil. Retrieved from http://hdl.handle.net/10183/114835

Chicago Manual of Style (16^th Edition):

Gomes, Lara Elena. “Forças propulsivas durante o movimento de palmateio : contribuições para a natação.” 2015. Doctoral Dissertation, Brazil. Accessed April 16, 2021. http://hdl.handle.net/10183/114835.

MLA Handbook (7^th Edition):

Gomes, Lara Elena. “Forças propulsivas durante o movimento de palmateio : contribuições para a natação.” 2015. Web. 16 Apr 2021.

Vancouver:

Gomes LE. Forças propulsivas durante o movimento de palmateio : contribuições para a natação. [Internet] [Doctoral dissertation]. Brazil; 2015. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10183/114835.

Council of Science Editors:

Gomes LE. Forças propulsivas durante o movimento de palmateio : contribuições para a natação. [Doctoral Dissertation]. Brazil; 2015. Available from: http://hdl.handle.net/10183/114835

2. Paraz, Florine. Oscillation d'une plaque flexible dans un écoulement : Oscillation of a flexible plate in a flow.

Degree: Docteur es, Mécanique et physique des fluides, 2015, Aix Marseille Université

URL: http://www.theses.fr/2015AIXM4327

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La physique de nage d’une nageoire caudale flexible est étudiée expérimentalement grâce à une plaque flexible immergée dans un écoulement uniforme. Le bord d’attaque est… (more)

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La physique de nage d’une nageoire caudale flexible est étudiée expérimentalement grâce à une plaque flexible immergée dans un écoulement uniforme. Le bord d’attaque est forcé par un mouvement harmonique, tandis que le bord de fuite répond passivement au forçage. Une résonance en amplitude dans la réponse est mise en évidence et révèle une forte interaction entre les fréquences naturelles de la plaque et celles du forçage. Les résultats expérimentaux suggèrent un rôle non trivial de l’amplitude de forçage, qui souligne le rôle des non linéarités dans ce problème. Pour avoir une meilleure compréhension de l'origine de ces non linéarités, un modèle analytique faiblement non linéaire a été développé. Nous supposons une plaque d'épaisseur nulle immergée dans un écoulement potentiel, sujette à une force de traînée résistive. La déflection de la plaque a ensuite été décomposée en un mode rigide, mimant le forçage en pilonnement et en modes propres de flexion d’une poutre dans le vide. Les prédictions de la réponse en amplitude et en fréquence du système forcé sont alors calculées. Les fréquences de résonances, ainsi que l’enveloppe de la déflection, sont en bon accord avec les résultats expérimentaux. Les performances du système, mesurées à travers la poussée générée, est également correctement prédite par la modélisation. L’accord entre les expériences et le modèle est étendu à une étude trouvée dans la littérature. Une optimisation analytique a été conduite et étendue à l’application de la bio-robotique.

The physics of the swimming with a flexible caudal fin is studied experimentally by the means of an elastic plate immersed in a uniform water flow. The leading edge of the plate is forced into a harmonic motion, while its trailing edge responds passively to this actuation. A resonance response in amplitude is demonstrated, revealing a strong interaction between the natural frequencies of the plate and the forcing frequencies. Experimental results suggest a non-trivial role of the forcing amplitude, emphasizing the role of non linearities in this problem. To gain better insight into the origin of these non linearities, a weakly non linear model is developed. We model a quasi two-dimensional plate of zero thickness immersed in a potential flow and subject to a resistive drag-like force. The plate deflection is then decomposed into a forcing heaving mode and natural flexural modes. Predictions of the response in amplitude and frequency to a heave forcing system are then calculated. The frequencies of the resonances, as well as the shapes of the deflection, match the experimental results. The performance of the system measured through the generated thrust, is well predicted by the modelling. The experimental and modelling results presented here show (very) good agreement with the literature. Finally, an analytical optimization is undertaken and potential applications to bio-robotic are suggested.

Advisors/Committee Members: Schouveiler, Lionel (thesis director), Eloy, Christophe (thesis director).

Subjects/Keywords: Flexibilité; Résonance; Propulsion; Nage; Interaction fluide-Structure; Flexibility; Resonance; Propulsion; Swimming; Interaction fluid-Structure

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APA (6^th Edition):

Paraz, F. (2015). Oscillation d'une plaque flexible dans un écoulement : Oscillation of a flexible plate in a flow. (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2015AIXM4327

Chicago Manual of Style (16^th Edition):

Paraz, Florine. “Oscillation d'une plaque flexible dans un écoulement : Oscillation of a flexible plate in a flow.” 2015. Doctoral Dissertation, Aix Marseille Université. Accessed April 16, 2021. http://www.theses.fr/2015AIXM4327.

MLA Handbook (7^th Edition):

Paraz, Florine. “Oscillation d'une plaque flexible dans un écoulement : Oscillation of a flexible plate in a flow.” 2015. Web. 16 Apr 2021.

Vancouver:

Paraz F. Oscillation d'une plaque flexible dans un écoulement : Oscillation of a flexible plate in a flow. [Internet] [Doctoral dissertation]. Aix Marseille Université 2015. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2015AIXM4327.

Council of Science Editors:

Paraz F. Oscillation d'une plaque flexible dans un écoulement : Oscillation of a flexible plate in a flow. [Doctoral Dissertation]. Aix Marseille Université 2015. Available from: http://www.theses.fr/2015AIXM4327

Indiana University

3. White, Joshua Childs. Development and Validity Assessment of the Max Power Model for the Detection, Separation, and Quantification of Differences in Resistive and Propulsive Forces in Swimming .

Degree: 2010, Indiana University

URL: http://hdl.handle.net/2022/7706

► Purpose: The purpose of this study was twofold. First, a new method, the Max Power Model, for assessing resistive (Fres) and propulsive (Fprop) forces using… (more)

▼ Purpose: The purpose of this study was twofold. First, a new method, the Max Power Model, for assessing resistive (Fres) and propulsive (Fprop) forces using tethered swimming was developed. The Max Power Model (MPM) is based on the maximum power that a swimmer can deliver to an external load while swimming (Pmax) and its relationship with the maximum velocity of the swimmer (vmax). The development of the MPM was accomplished in three ways: examination of the shape of the Pmax vs. vmax curve, development of a method of comparing Pmax vs. vmax curves, and finally testing the sensitivity of the method to large changes using the four competitive strokes and underwater dolphin kicking. Second, the validity of the MPM was assessed by comparison with the Velocity Perturbation Model (VPM) and response to independent changes in Fres and Fprop during swimming (as supplied by a pocketed dragsuit, a wetsuit, hand paddles, fist gloves). Results: The MPM was developed effectively. The Pmax vs. vmax curve was found to be best described as an exponential function. Comparisons of Pmax vs. vmax curves were therefore made after linearization using the natural log of Pmax. If the slopes were similar, the comparisons were accomplished using ANCOVA with vmax as the covariate, otherwise a t-test for differences in slope was used. The MPM was sensitive to large changes in the swimming condition as seen through significant differences (p < 60; 0.05) in an ANCOVA for competitive stroke and a significantly different slope of ln(Pmax) vs. vmax for underwater dolphin kick in comparison with the competitive strokes. Assessment of the validity of the MPM yielded mixed results. The MPM showed a strong relationship to the VPM. However, the VPM showed no significant differences between any of the equipment treatment conditions in either the calculated Fres or the drag coefficient indicating an inability to detect small changes in Fres and Fprop. The MPM showed more promise, responding as expected to a majority of the equipment conditions. Conclusion: While still in need of further exploration and validation, the MPM has promise as a simple method to detect, separate, and quantify differences in Fres and Fprop during swimming. Advisors/Committee Members: Stager, Joel M (advisor).

Subjects/Keywords: Sprint Swimming; Tethered Swimming; Active Drag; Swimming Propulsion

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APA (6^th Edition):

White, J. C. (2010). Development and Validity Assessment of the Max Power Model for the Detection, Separation, and Quantification of Differences in Resistive and Propulsive Forces in Swimming . (Thesis). Indiana University. Retrieved from http://hdl.handle.net/2022/7706

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

White, Joshua Childs. “Development and Validity Assessment of the Max Power Model for the Detection, Separation, and Quantification of Differences in Resistive and Propulsive Forces in Swimming .” 2010. Thesis, Indiana University. Accessed April 16, 2021. http://hdl.handle.net/2022/7706.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

White, Joshua Childs. “Development and Validity Assessment of the Max Power Model for the Detection, Separation, and Quantification of Differences in Resistive and Propulsive Forces in Swimming .” 2010. Web. 16 Apr 2021.

Vancouver:

White JC. Development and Validity Assessment of the Max Power Model for the Detection, Separation, and Quantification of Differences in Resistive and Propulsive Forces in Swimming . [Internet] [Thesis]. Indiana University; 2010. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/2022/7706.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

White JC. Development and Validity Assessment of the Max Power Model for the Detection, Separation, and Quantification of Differences in Resistive and Propulsive Forces in Swimming . [Thesis]. Indiana University; 2010. Available from: http://hdl.handle.net/2022/7706

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Carnegie Mellon University

4. Chisholm, Nicholas G. Locomotion and Drift in Viscous Flows: Numerical and Asymptotic Predictions.

Degree: 2017, Carnegie Mellon University

URL: http://repository.cmu.edu/dissertations/892

► We theoretically investigate the fluid mechanics of self-propelled (or swimming) bodies. An important factor concerning the hydrodynamics of locomotion concerns the relative strength of inertial… (more)

Subjects/Keywords: biogenic mixing; drift; fluid mechanics; self-propulsion; swimming

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APA (6^th Edition):

Chisholm, N. G. (2017). Locomotion and Drift in Viscous Flows: Numerical and Asymptotic Predictions. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/892

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chisholm, Nicholas G. “Locomotion and Drift in Viscous Flows: Numerical and Asymptotic Predictions.” 2017. Thesis, Carnegie Mellon University. Accessed April 16, 2021. http://repository.cmu.edu/dissertations/892.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chisholm, Nicholas G. “Locomotion and Drift in Viscous Flows: Numerical and Asymptotic Predictions.” 2017. Web. 16 Apr 2021.

Vancouver:

Chisholm NG. Locomotion and Drift in Viscous Flows: Numerical and Asymptotic Predictions. [Internet] [Thesis]. Carnegie Mellon University; 2017. [cited 2021 Apr 16]. Available from: http://repository.cmu.edu/dissertations/892.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chisholm NG. Locomotion and Drift in Viscous Flows: Numerical and Asymptotic Predictions. [Thesis]. Carnegie Mellon University; 2017. Available from: http://repository.cmu.edu/dissertations/892

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Princeton University

5. Floryan, Daniel. Hydromechanics and Optimization of Fast and Efficient Swimming .

Degree: PhD, 2019, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp013t945t65k

► This dissertation focuses on the mechanics of locomotion through a fluid medium characterized by propulsors (fins and wings) with a large aspect ratio and a… (more)

▼ This dissertation focuses on the mechanics of locomotion through a fluid medium characterized by propulsors (fins and wings) with a large aspect ratio and a large Reynolds number. The subject so delimited is of particular interest because on the order of 100 million years of animal evolution have led to fast and efficient animals converging upon such features. Idealized models of propulsors are studied in order to distill the essential physics responsible for fast and efficient locomotion, rather than the idiosyncrasies of any particular animal. The first half considers a rigid propulsor, where the kinematics are known it{a priori}. We derive a set of scaling laws for the thrust, power, and efficiency of a propulsor sinusoidally heaving or pitching while translating in a uniform stream. The validity of the scaling laws is borne out by their success in collapsing a wide array of experimental data. Moreover, physical phenomena are easily attributed to different terms in the scaling laws, revealing an important but previously unappreciated interplay between added mass and lift-based forces. The scaling laws are extended to non-sinusoidal kinematics, intermittent kinematics, and combined heaving and pitching kinematics, at each step collapsing experimental data and revealing important physics. The second half considers a flexible propulsor, where the kinematics are unknown it{a priori}. We start with the simplest case of a propulsor with homogeneous stiffness. To understand the role of fluid-structure resonance, we calculate the spectrum of the governing equations. The results demonstrate that resonance induces local maxima in thrust and power, in agreement with the literature, but does not by itself induce local maxima in efficiency, as assumed in the literature. Flutter eigenfunctions emerge as the system's stiffness is decreased, increasing locomotory efficiency. The results are then extended to propulsors with heterogeneous stiffness, and we calculate optimal distributions of stiffness over a wide range of conditions. Throughout, the importance of fluid drag is discussed. For rigid propulsors, drag induces a global maximum in efficiency, plausibly explaining the narrow operating conditions observed in dolphins, sharks, bony fish, birds, bats, and insects. For flexible propulsors, drag induces local maxima in efficiency at resonance. Advisors/Committee Members: Rowley, Clarence W (advisor), Smits, Alexander J (advisor).

Subjects/Keywords: biological fluid dynamics; fluid-structure interaction; propulsion; swimming/flying

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Floryan, D. (2019). Hydromechanics and Optimization of Fast and Efficient Swimming . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp013t945t65k

Chicago Manual of Style (16^th Edition):

Floryan, Daniel. “Hydromechanics and Optimization of Fast and Efficient Swimming .” 2019. Doctoral Dissertation, Princeton University. Accessed April 16, 2021. http://arks.princeton.edu/ark:/88435/dsp013t945t65k.

MLA Handbook (7^th Edition):

Floryan, Daniel. “Hydromechanics and Optimization of Fast and Efficient Swimming .” 2019. Web. 16 Apr 2021.

Vancouver:

Floryan D. Hydromechanics and Optimization of Fast and Efficient Swimming . [Internet] [Doctoral dissertation]. Princeton University; 2019. [cited 2021 Apr 16]. Available from: http://arks.princeton.edu/ark:/88435/dsp013t945t65k.

Council of Science Editors:

Floryan D. Hydromechanics and Optimization of Fast and Efficient Swimming . [Doctoral Dissertation]. Princeton University; 2019. Available from: http://arks.princeton.edu/ark:/88435/dsp013t945t65k

Princeton University

6. Floryan, Daniel. Hydromechanics and Optimization of Fast and Efficient Swimming .

Degree: PhD, 2019, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp01p2676z42j

► This dissertation focuses on the mechanics of locomotion through a fluid medium characterized by propulsors (fins and wings) with a large aspect ratio and a… (more)

▼ This dissertation focuses on the mechanics of locomotion through a fluid medium characterized by propulsors (fins and wings) with a large aspect ratio and a large Reynolds number. The subject so delimited is of particular interest because on the order of 100 million years of animal evolution have led to fast and efficient animals converging upon such features. Idealized models of propulsors are studied in order to distill the essential physics responsible for fast and efficient locomotion, rather than the idiosyncrasies of any particular animal. The first half considers a rigid propulsor, where the kinematics are known it{a priori}. We derive a set of scaling laws for the thrust, power, and efficiency of a propulsor sinusoidally heaving or pitching while translating in a uniform stream. The validity of the scaling laws is borne out by their success in collapsing a wide array of experimental data. Moreover, physical phenomena are easily attributed to different terms in the scaling laws, revealing an important but previously unappreciated interplay between added mass and lift-based forces. The scaling laws are extended to non-sinusoidal kinematics, intermittent kinematics, and combined heaving and pitching kinematics, at each step collapsing experimental data and revealing important physics. The second half considers a flexible propulsor, where the kinematics are unknown it{a priori}. We start with the simplest case of a propulsor with homogeneous stiffness. To understand the role of fluid-structure resonance, we calculate the spectrum of the governing equations. The results demonstrate that resonance induces local maxima in thrust and power, in agreement with the literature, but does not by itself induce local maxima in efficiency, as assumed in the literature. Flutter eigenfunctions emerge as the system's stiffness is decreased, increasing locomotory efficiency. The results are then extended to propulsors with heterogeneous stiffness, and we calculate optimal distributions of stiffness over a wide range of conditions. Throughout, the importance of fluid drag is discussed. For rigid propulsors, drag induces a global maximum in efficiency, plausibly explaining the narrow operating conditions observed in dolphins, sharks, bony fish, birds, bats, and insects. For flexible propulsors, drag induces local maxima in efficiency at resonance. Advisors/Committee Members: Rowley, Clarence W (advisor), Smits, Alexander J (advisor).

Subjects/Keywords: biological fluid dynamics; fluid-structure interaction; propulsion; swimming/flying

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Floryan, D. (2019). Hydromechanics and Optimization of Fast and Efficient Swimming . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01p2676z42j

Chicago Manual of Style (16^th Edition):

Floryan, Daniel. “Hydromechanics and Optimization of Fast and Efficient Swimming .” 2019. Doctoral Dissertation, Princeton University. Accessed April 16, 2021. http://arks.princeton.edu/ark:/88435/dsp01p2676z42j.

MLA Handbook (7^th Edition):

Floryan, Daniel. “Hydromechanics and Optimization of Fast and Efficient Swimming .” 2019. Web. 16 Apr 2021.

Vancouver:

Floryan D. Hydromechanics and Optimization of Fast and Efficient Swimming . [Internet] [Doctoral dissertation]. Princeton University; 2019. [cited 2021 Apr 16]. Available from: http://arks.princeton.edu/ark:/88435/dsp01p2676z42j.

Council of Science Editors:

Floryan D. Hydromechanics and Optimization of Fast and Efficient Swimming . [Doctoral Dissertation]. Princeton University; 2019. Available from: http://arks.princeton.edu/ark:/88435/dsp01p2676z42j

Lehigh University

7. Ayancik Cinoglu, Fatma. Understanding the Role of Morphology and Kinematics in Bio-Inspired Locomotion.

Degree: PhD, Mechanical Engineering, 2019, Lehigh University

URL: https://preserve.lehigh.edu/etd/5722

► Inspired by the advanced capabilities of fish and other aquatic swimmers, in this thesis, a greater understanding of fish-like propulsion has been sought in… (more)

Subjects/Keywords: Fluid Mechanics; Optimization; Propulsion; Scaling Laws; Swimming; Unsteady Flows; Mechanical Engineering

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APA (6^th Edition):

Ayancik Cinoglu, F. (2019). Understanding the Role of Morphology and Kinematics in Bio-Inspired Locomotion. (Doctoral Dissertation). Lehigh University. Retrieved from https://preserve.lehigh.edu/etd/5722

Chicago Manual of Style (16^th Edition):

Ayancik Cinoglu, Fatma. “Understanding the Role of Morphology and Kinematics in Bio-Inspired Locomotion.” 2019. Doctoral Dissertation, Lehigh University. Accessed April 16, 2021. https://preserve.lehigh.edu/etd/5722.

MLA Handbook (7^th Edition):

Ayancik Cinoglu, Fatma. “Understanding the Role of Morphology and Kinematics in Bio-Inspired Locomotion.” 2019. Web. 16 Apr 2021.

Vancouver:

Ayancik Cinoglu F. Understanding the Role of Morphology and Kinematics in Bio-Inspired Locomotion. [Internet] [Doctoral dissertation]. Lehigh University; 2019. [cited 2021 Apr 16]. Available from: https://preserve.lehigh.edu/etd/5722.

Council of Science Editors:

Ayancik Cinoglu F. Understanding the Role of Morphology and Kinematics in Bio-Inspired Locomotion. [Doctoral Dissertation]. Lehigh University; 2019. Available from: https://preserve.lehigh.edu/etd/5722

8. Arbie, Muhammad Rizqie. Stability of self-propelled body wake : Stabilité du sillage d'un corps auto-propulsé.

Degree: Docteur es, Mécanique et Physique des Fluides, 2016, Aix Marseille Université

URL: http://www.theses.fr/2016AIXM4754

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La nageoire caudale des animaux aquatiques peut être modélisée par un foil oscillant qui produit de la poussée. Le sillage moyen d'un tel foil oscillant… (more)

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La nageoire caudale des animaux aquatiques peut être modélisée par un foil oscillant qui produit de la poussée. Le sillage moyen d'un tel foil oscillant est un jet de quantité de mouvement nette positive. Il a été proposé que les caractéristiques de stabilité de ces sillages moyens sont liées à l'efficacité de la propulsion des animaux aquatiques. Dans cet étude, nous reprenons cette question en tenant compte à la fois de la poussée et de la traînée exercée sur un corps auto-propulsé lorsqu'il nage. Nous étudions la stabilité d'une famille de sillages ayant une quantité de mouvement nulle, construit comme l'approximation d'Oseen d'un doublet de force se déplaçant à vitesse constante. En effectuant une analyse de stabilité locale, nous montrons d'abord que ces sillages subissent une transition convectif-absolu. En utilisant une approche "time-stepper" et intégrant le système de Navier-Stokes linéarisé, nous étudions la stabilité globale et mettons en évidence des effets non-parallèles de l'écoulement principal, ainsi que le rôle de la région absolument instable dans l'écoulement. Pour compléter le scénario d'instabilité globale, nous abordons l'évolution non linéaire d'une perturbation injectée dans le sillage. Ces résultats sont ensuite discutés dans le contexte de la nage d'un animal aquatique. Selon les résultats de stabilité, les sillages de quantité de mouvement nulle produit par les animaux aquatiques sont généralement stables, tandis que le sillage qui correspondrait à la poussée seule est instable. Il est essentiel de considérer toutes les forces exercées sur un animal auto-propulsé lors de l'examen de la stabilité de son sillage et l'efficacité de sa propulsion.

The caudal fin of swimming animals can be modelled as a thrust-producing flapping foil. When considered alone, such a foil produces on average a jet wake with a positive net momentum. It has been argued that the instability characteristics of these averaged wakes are linked to the propulsion efficiency of swimming animals. Here, we reconsider this question by taking into account both the thrust and the drag exerted on a self-propelled swimming body. To do so, we study the stability of a family of momentumless wakes, constructed as the Oseen approximation of a force doublet moving at constant velocity. By performing a local stability analysis, we first show that these wakes undergo a transition from absolute to convective instability. Then, using the time-stepper approach by integrating the linearised Navier-Stokes system, we investigate the global stability and reveal the influence of a non-parallel base flow as well as the role of the locally absolutely unstable upstream region in the wake. Finally, to complete the global scenario, we address the nonlinear evolution of the wake disturbance. These results are then discussed in the context of aquatic locomotion. According to the present stability results, the momentumless wake of aquatic animals is generally stable, whereas the corresponding thrust part is unstable. It is therefore essential to…

Advisors/Committee Members: Eloy, Christophe (thesis director), Ehrenstein, Uwe (thesis director).

Subjects/Keywords: Hydrodynamique; Sillage; Stabilité; Auto-Propulsé; Nage; Hydrodynamic; Wake; Stability; Self-Propulsion; Swimming

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APA (6^th Edition):

Arbie, M. R. (2016). Stability of self-propelled body wake : Stabilité du sillage d'un corps auto-propulsé. (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2016AIXM4754

Chicago Manual of Style (16^th Edition):

Arbie, Muhammad Rizqie. “Stability of self-propelled body wake : Stabilité du sillage d'un corps auto-propulsé.” 2016. Doctoral Dissertation, Aix Marseille Université. Accessed April 16, 2021. http://www.theses.fr/2016AIXM4754.

MLA Handbook (7^th Edition):

Arbie, Muhammad Rizqie. “Stability of self-propelled body wake : Stabilité du sillage d'un corps auto-propulsé.” 2016. Web. 16 Apr 2021.

Vancouver:

Arbie MR. Stability of self-propelled body wake : Stabilité du sillage d'un corps auto-propulsé. [Internet] [Doctoral dissertation]. Aix Marseille Université 2016. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2016AIXM4754.

Council of Science Editors:

Arbie MR. Stability of self-propelled body wake : Stabilité du sillage d'un corps auto-propulsé. [Doctoral Dissertation]. Aix Marseille Université 2016. Available from: http://www.theses.fr/2016AIXM4754

Indian Institute of Science

9. Nathan, Vinay. Analysis of Unsteady Incompressible Potential Flow Over a Swimming Slender Fish and a Swept Wing Tail.

Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3551

► This thesis deals with computing the pressure distribution around a swimming slender fish and the thrust generated by its flapping motion. The body of the… (more)

Subjects/Keywords: Swimming Slender Fish Flow Dynamics; Slender Body Flow Model; Swept Wing Model; Planar Wing Flow; Unsteady Flows; Vortex Dynamics; Swimming Propulsion; Unsteady Propulsion; Fishlike Swimmimg Hydrodynamics; Fish Near-Body Flow Dynamics; Marine Propulsion; Fluid Dynamics; Vortex Panel Method; Bernoulli Equation; Aerospace Engineering

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APA (6^th Edition):

Nathan, V. (2018). Analysis of Unsteady Incompressible Potential Flow Over a Swimming Slender Fish and a Swept Wing Tail. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3551

Chicago Manual of Style (16^th Edition):

Nathan, Vinay. “Analysis of Unsteady Incompressible Potential Flow Over a Swimming Slender Fish and a Swept Wing Tail.” 2018. Masters Thesis, Indian Institute of Science. Accessed April 16, 2021. http://etd.iisc.ac.in/handle/2005/3551.

MLA Handbook (7^th Edition):

Nathan, Vinay. “Analysis of Unsteady Incompressible Potential Flow Over a Swimming Slender Fish and a Swept Wing Tail.” 2018. Web. 16 Apr 2021.

Vancouver:

Nathan V. Analysis of Unsteady Incompressible Potential Flow Over a Swimming Slender Fish and a Swept Wing Tail. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Apr 16]. Available from: http://etd.iisc.ac.in/handle/2005/3551.

Council of Science Editors:

Nathan V. Analysis of Unsteady Incompressible Potential Flow Over a Swimming Slender Fish and a Swept Wing Tail. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3551

10. Dewey, Peter. Underwater Flight: Hydrodynamics of the Manta Ray .

Degree: PhD, 2013, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp01jd472w52n

► Experiments are conducted to better understand the effects of flexibility in generating unsteady bio-inspired propulsion. It is found that by exploiting the effects of flexibility,… (more)

Subjects/Keywords: Fluid dynamics; Propulsion; Swimming/Flying; Vortex dynamics

…unsteady propulsion. The underlying mechanisms of fish-like swimming are considered and a… …al. [1999]. . . . . . . . . . . . . . . x 10 2.6 Swimming modes associated… …with (a) BCF propulsion and (b) MPF propulsion. Shaded areas contribute… …Gymnura micrura and (C) Rhinoptera bonasus swimming in a flow tank. D. sabina swims by… …animals swimming and flying make it seem as though they do so effortlessly. This has motivated…

11 more images…

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APA (6^th Edition):

Dewey, P. (2013). Underwater Flight: Hydrodynamics of the Manta Ray . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01jd472w52n

Chicago Manual of Style (16^th Edition):

Dewey, Peter. “Underwater Flight: Hydrodynamics of the Manta Ray .” 2013. Doctoral Dissertation, Princeton University. Accessed April 16, 2021. http://arks.princeton.edu/ark:/88435/dsp01jd472w52n.

MLA Handbook (7^th Edition):

Dewey, Peter. “Underwater Flight: Hydrodynamics of the Manta Ray .” 2013. Web. 16 Apr 2021.

Vancouver:

Dewey P. Underwater Flight: Hydrodynamics of the Manta Ray . [Internet] [Doctoral dissertation]. Princeton University; 2013. [cited 2021 Apr 16]. Available from: http://arks.princeton.edu/ark:/88435/dsp01jd472w52n.

Council of Science Editors:

Dewey P. Underwater Flight: Hydrodynamics of the Manta Ray . [Doctoral Dissertation]. Princeton University; 2013. Available from: http://arks.princeton.edu/ark:/88435/dsp01jd472w52n

11. Quinn, Daniel. Optimizing the Efficiency of Batoid-Inspired Swimming .

Degree: PhD, 2015, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp01j96022862

► Traditional propellers lack the combination of efficiency, maneuverability, and stealth found among swimmers in nature. With this deficiency as motivation, two aspects of batoid-inspired swimming… (more)

▼ Traditional propellers lack the combination of efficiency, maneuverability, and stealth found among swimmers in nature. With this deficiency as motivation, two aspects of batoid-inspired swimming are investigated: flexibility and propulsor-boundary interactions. In the case of flexibility, direct force measurements on flexible panels reveal that operating in resonance can increase both thrust and efficiency. Gradient-based optimization is used to isolate the resonant modes of one panel, and Particle Image Velocimetry (PIV) is used to study the optimum and near-optimum conditions. Efficiency is globally optimized when (1) the Strouhal number is within an optimal range that varies weakly with amplitude and boundary conditions; (2) the panel is actuated at a resonant frequency of the fluid-panel system; (3) heave amplitude is tuned such that trailing edge amplitude is maximized while the flow along the body remains attached; and (4) the maximum pitch angle and phase lag are chosen so that the effective angle of attack is minimized. The multi-dimensionality and multi-modality of the efficiency response demonstrate that experimental optimization is well-suited for the design of flexible underwater propulsors. Linear beam theory combined with the Lighthill model offers a dimensionless parameter that can be used to tune propulsors to resonant modes. In self-propelled swimming trials, flexibility is found to increase the swimming economy, even at constant Strouhal number, challenging the traditional view that Strouhal number is a primary indicator of efficiency. Propulsor-boundary interactions are relevant to fish schooling, bodies with multiple fins, and fishes/vehicles that swim near the substrate. In the case of rigid foils operating near a rigid flat boundary, thrust is found to increase monotonically as the foil approaches the ground, and efficiency remains constant. A semi-empirical power law is offered to quantify this behavior, and the same power law is observed in potential flow computations that were run parallel to the experiments. In the near-ground case, momentum jets behind the foil angle away from the ground under most conditions. This angling was also seen in the potential flow computations and is explained using the vortex array model. When propulsors are flexible, propulsive efficiency can increase near the ground in addition to thrust. Direct force measurements on two airfoils pitching side-by-side reveal that thrust or efficiency can be increased or decreased depending on the phase offset between the two airfoils. The momentum jets in the wake of the airfoils either converge or diverge, also depending on the phase offset. When the two foils are 180^∘ out of phase, the forces and flow patterns match those seen in ground effect, as anticipated by the method of images. This behavior is reproduced with an analytical vortex array model. The scaling laws presented here lay a framework for underwater vehicles that use multiple propulsors or swim near the substrate to increase thrust… Advisors/Committee Members: Smits, Alexander J (advisor).

Subjects/Keywords: biolocomotion; fluid-structure interaction; ground effect; propulsion; swimming; unsteady aerodynamics

…Swimming modes associated with body + caudal fin propulsion (a) and medial/paired fin… …found on fishes. . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 6 Swimming modes… …associated with body + caudal fin propulsion (a) and medial/paired fin propulsion (b… …Rosenberger [2001] of a cownose ray (Rhinoptera bonasus) swimming in a flow tank… …58 3.10 Swimming economy. Symbols as in figure 3.2. . . . . . . . . . . . . . 59 3.11…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Quinn, D. (2015). Optimizing the Efficiency of Batoid-Inspired Swimming . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01j96022862

Chicago Manual of Style (16^th Edition):

Quinn, Daniel. “Optimizing the Efficiency of Batoid-Inspired Swimming .” 2015. Doctoral Dissertation, Princeton University. Accessed April 16, 2021. http://arks.princeton.edu/ark:/88435/dsp01j96022862.

MLA Handbook (7^th Edition):

Quinn, Daniel. “Optimizing the Efficiency of Batoid-Inspired Swimming .” 2015. Web. 16 Apr 2021.

Vancouver:

Quinn D. Optimizing the Efficiency of Batoid-Inspired Swimming . [Internet] [Doctoral dissertation]. Princeton University; 2015. [cited 2021 Apr 16]. Available from: http://arks.princeton.edu/ark:/88435/dsp01j96022862.

Council of Science Editors:

Quinn D. Optimizing the Efficiency of Batoid-Inspired Swimming . [Doctoral Dissertation]. Princeton University; 2015. Available from: http://arks.princeton.edu/ark:/88435/dsp01j96022862

12. Moreau, Clément. Contrôlabilité en dimension finie et infinie et applications à des systèmes non linéaires issus du vivant : Controllability in finite and infinite dimension and applications to bio-inspired nonlinear systems.

Degree: Docteur es, Mathématiques, 2020, Université Côte d'Azur

URL: http://www.theses.fr/2020COAZ4020

►

Cette thèse traite des aspects mathématiques de la contrôlabilité de micro-robots nageurs et de la mobilité de micro-filaments, avec des ramifications en théorie du contrôle… (more)

▼

Cette thèse traite des aspects mathématiques de la contrôlabilité de micro-robots nageurs et de la mobilité de micro-filaments, avec des ramifications en théorie du contrôle et en modélisation. La première partie présente les résultats de théorie du contrôle obtenus. On énonce d'une part une condition nécessaire de contrôlabilité locale pour une classe particulière de systèmes à deux contrôles en dimension finie, grâce à l'étude de la série de Chen-Fliess associée à ces systèmes. D'autre part, on établit la contrôlabilité avec contrainte de positivité sur l'état pour des systèmes d'équations aux dérivées partielles linéaires paraboliques couplées. On démontre qu'il est possible de contrôler ce type de systèmes en conservant l'état approximativement positif lorsque la matrice de diffusion est diagonalisable, et en conservant l'état positif dans le cas particulier ou celle-ci est égale à la matrice identité.La deuxième partie aborde les applications au domaine de la micro-natation, et constitue une illustration des résultats de la première partie. On s'intéresse plus précisément à des robots nageurs magnétiques planaires constitués de deux et trois segments, reliés entre eux par des liaisons élastiques, et contrôlés par un champ magnétique. On démontre que ces robots ne sont en général pas contrôlables au voisinage de leur équilibre pour lequel les segments sont alignés, et on explicite les cas particuliers dans lesquels on peut obtenir la contrôlabilité. Les résultats sont appuyés par des simulations numériques.Dans la troisième partie, on présente des travaux de modélisation et de simulation numérique autour du mouvement de micro-filaments élastiques à bas nombre de Reynolds. On décrit un modèle à N segments performant, robuste et polyvalent. On le valide en comparaison à un autre modèle, puis on l'utilise pour réaliser une étude numérique du phénomène de buckling (flambage) d'un filament.

This thesis deals with mathematical aspects of controllability of micro-swimming robots and of motility of micro-filaments, with ramifications in control theory and modeling. The first part presents our control theory results. On the one hand, we state a necessary condition of local controllability for a particular class of systems with two controls, based on the study of the Chen-Fliess series associated to these systems. On the other hand, we establish controllability for linear coupled parabolic systems of partial differential equations with nonnegative state constraint. We show that it is possible to control these systems while making sure that the state remains approximately nonnegative when the diffusion matrix is diagonalizable, and that it remains nonnegative in the particular case where it is equal to the identity matrix.The second part addresses applications to micro-swimming, and illustrates the results of the first part. More precisely, we study planar magnetic micro-swimmer robots made of two or three segments, connected by elastic joints, and controlled by a magnetic field. We show that these robots are not…

Advisors/Committee Members: Pomet, Jean-Baptiste (thesis director).

Subjects/Keywords: Théorie du contrôle; Contrôlabilité; Micro-natation; Modélisation de micro-filaments; Control theory; Controllability; Micro-swimming; Low Reynolds number propulsion; Micro-filament modeling; Dynamic buckling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moreau, C. (2020). Contrôlabilité en dimension finie et infinie et applications à des systèmes non linéaires issus du vivant : Controllability in finite and infinite dimension and applications to bio-inspired nonlinear systems. (Doctoral Dissertation). Université Côte d'Azur. Retrieved from http://www.theses.fr/2020COAZ4020

Chicago Manual of Style (16^th Edition):

Moreau, Clément. “Contrôlabilité en dimension finie et infinie et applications à des systèmes non linéaires issus du vivant : Controllability in finite and infinite dimension and applications to bio-inspired nonlinear systems.” 2020. Doctoral Dissertation, Université Côte d'Azur. Accessed April 16, 2021. http://www.theses.fr/2020COAZ4020.

MLA Handbook (7^th Edition):

Moreau, Clément. “Contrôlabilité en dimension finie et infinie et applications à des systèmes non linéaires issus du vivant : Controllability in finite and infinite dimension and applications to bio-inspired nonlinear systems.” 2020. Web. 16 Apr 2021.

Vancouver:

Moreau C. Contrôlabilité en dimension finie et infinie et applications à des systèmes non linéaires issus du vivant : Controllability in finite and infinite dimension and applications to bio-inspired nonlinear systems. [Internet] [Doctoral dissertation]. Université Côte d'Azur; 2020. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2020COAZ4020.

Council of Science Editors:

Moreau C. Contrôlabilité en dimension finie et infinie et applications à des systèmes non linéaires issus du vivant : Controllability in finite and infinite dimension and applications to bio-inspired nonlinear systems. [Doctoral Dissertation]. Université Côte d'Azur; 2020. Available from: http://www.theses.fr/2020COAZ4020

13. Gomes, Lara Elena. Comparação entre forças propulsivas efetivas calculadas e medida durante um palmateio de sustentação.

Degree: 2010, Brazil

URL: http://hdl.handle.net/10183/27677

►

A força propulsiva gerada durante o palmateio é resultado do somatório das forças de arrasto e de sustentação, sendo que a componente que atua na… (more)

▼

A força propulsiva gerada durante o palmateio é resultado do somatório das forças de arrasto e de sustentação, sendo que a componente que atua na direção do movimento desejado é igual à força propulsiva efetiva. Essas forças podem ser estimadas a partir de equações hidrodinâmicas, porém essas equações não consideram todos os mecanismos que contribuem para a propulsão. Dessa forma, o objetivo geral do presente estudo foi comparar a força propulsiva efetiva calculada a partir das equações hidrodinâmicas e a força propulsiva efetiva medida durante o palmateio de sustentação (na posição vertical, de cabeça para cima) em cada fase do palmateio. Para isso, uma praticante de nado sincronizado realizou palmateio na posição vertical de cabeça para cima durante 15 segundos, enquanto que dados cinemáticos e cinéticos foram obtidos por viodeogrametria 3D e dinamometria respectivamente. A análise gráfica de Bland e Altman foi usada para comparar as forças propulsivas efetivas medida e calculada durante o palmateio. As forças propulsivas efetivas calculada e medida foram diferentes, sendo a medida maior que a calculada. Ainda, os resultados indicaram que o palmateio executado não foi simétrico, isto é, a orientação e a força propulsiva entre a mão direita e a esquerda foram diferentes. Portanto, o achado do presente trabalho destaca a importância de mecanismos instáveis para a propulsão durante o palmateio, já que as forças estimadas por meio das equações hidrodinâmicas apresentaram resultados inferiores, sendo isso observado ao longo de todo o palmateio.

Propulsive force generated during sculling motion results from drag and lift propulsive forces, and the component acting in the direction of motion is the effective propulsive force. These forces may be calculated using hydrodynamic equations, but these equations do not consider all mechanisms that contribute to the propulsion. Thus, the main purpose of this study was to compare the calculated effective propulsive force using the hydrodynamic equations and the measured effective propulsive force during a support sculling motion (vertical position with the head above the water‟s surface) in each phase of sculling. For this, a practitioner of synchronized swimming performed sculling motion in a vertical position with the head above the water‟s surface during 15 seconds, while kinematic and kinetic data were obtained by 3D videogrammetry and dynamometry respectively. Graphical techniques from Bland and Altman were used to compare the measured effective propulsive force and calculated effective propulsive force during sculling motion. The calculated effective propulsive force and the measured effective propulsive force were different, the measured being greater than the calculated. Moreover, the results indicated sculling motion performed was not symmetric, that is, the orientation and propulsive forces between the right and left hands were different. Therefore, the result of this study highlights the importance of the unsteady mechanisms for the propulsion during sculling…

Advisors/Committee Members: Loss, Jefferson Fagundes.

Subjects/Keywords: Biomecânica; Natação : Fisiologia; Força; Propulsion; Attack angle; Drag force; Lift force; Swimming; Synchronized swimming

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gomes, L. E. (2010). Comparação entre forças propulsivas efetivas calculadas e medida durante um palmateio de sustentação. (Masters Thesis). Brazil. Retrieved from http://hdl.handle.net/10183/27677

Chicago Manual of Style (16^th Edition):

Gomes, Lara Elena. “Comparação entre forças propulsivas efetivas calculadas e medida durante um palmateio de sustentação.” 2010. Masters Thesis, Brazil. Accessed April 16, 2021. http://hdl.handle.net/10183/27677.

MLA Handbook (7^th Edition):

Gomes, Lara Elena. “Comparação entre forças propulsivas efetivas calculadas e medida durante um palmateio de sustentação.” 2010. Web. 16 Apr 2021.

Vancouver:

Gomes LE. Comparação entre forças propulsivas efetivas calculadas e medida durante um palmateio de sustentação. [Internet] [Masters thesis]. Brazil; 2010. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/10183/27677.

Council of Science Editors:

Gomes LE. Comparação entre forças propulsivas efetivas calculadas e medida durante um palmateio de sustentação. [Masters Thesis]. Brazil; 2010. Available from: http://hdl.handle.net/10183/27677

14. Gross, David. Nage sous marine générée par boucle de rétroaction de courbure avec modélisation de muscles locomoteurs : Self-propelled swimming by means of curvature-based feedback and muscle like elements.

Degree: Docteur es, Physique, 2019, Université Côte d'Azur (ComUE)

URL: http://www.theses.fr/2019AZUR4053

►

L'autopropulsion basée sur la propagation d'ondes de déformation, comme pour les poissons, pourrait être une alternative intéressante par rapport au déplacement généré par des hélices… (more)

▼

L'autopropulsion basée sur la propagation d'ondes de déformation, comme pour les poissons, pourrait être une alternative intéressante par rapport au déplacement généré par des hélices pour les bateaux et les véhicules sous-marins. La locomotion par ondulations implique une flexibilité de la structure du véhicule, dont il faut prendre en compte pour la dynamique des fluides et donc quantifier la vitesse et le rendement du déplacement. Dans cette thèse, nous avons développé une nouvelle méthode d'interaction fluide-structure (IFS) liant un solveur de dynamique de structure par éléments finis avec un solveur "vortex panel" bidimensionnel pour le couplage avec le fluide et une méthode des particules pour la résolution du sillage. Chaque composante du couplage IFS est d'abord validée indépendamment, puis nous testons le système complet dans le cadre d'une plaque flexible et bidimensionnelle en oscillation. La relation entre les paramètres cinématiques de nage et la vitesse de déplacement est reproduite et l'importance de la traînée pour cette relation est analysée avec détails. Pour modéliser le comportement d'un nageur souple, en autopropulsion, nous distribuons spatialement un moment de flexion, ce qui nous permet de faire des prédictions sur les grandeurs cinématiques de la nage. Par la suite, nous montrons qu'un moment de force rétroactif basée sur la courbure de déformation du nageur, avec un délai temporel, génère une autopropulsion différente de celle observée avec un forçage actif de moment de flexion. Nous proposons un modèle simplifié, capable à décrire le comportement du nageur avec rétroaction, pour comprendre qualitativement les phénomènes en jeux. Finalement, nous dérivons un modèle de muscle, en s'inspirant de la biologie ; et nous évaluons l'importance des différents paramètres du modèle quant à la performance d'autopropulsion. Le manuscrit de thèse se termine par l'analyse d'une plaque mince en trois dimensions, mise en oscillation pour apprécier la pertinence de la méthode tridimensionnelle "vortex panel" pour simuler la nage dans des conditions réelles.

Undulatory wave-based self-propulsion like used by fish may be a suitable alternative to traditional propeller-based propulsion for underwater vehicles. The use of undulatory propulsion implies a certain degree of structural flexibility will be present, hence consideration of both fluid and structure is critical to assessing the behavior of this form of propulsion. In this thesis, a novel segregated fluid-structure interaction (FSI) coupling scheme is developed between a finite element structure solver and a 2D unsteady panel method fluid solver with discrete vortex particle wake approach. The different components of the FSI solver are validated first individually and then as a whole using the case of a flexible two-dimensional plate in pure heave. The scaling law relating input swimming variables and the resulting swimming speed is then reproduced and the importance of drag to these relations is elucidated.A self-propelled swimmer whose beam-like…

Advisors/Committee Members: Argentina, Médéric (thesis director).

Subjects/Keywords: Interaction fluide-structure; Méthode des éléments finis; Méthodes des panneaux; Proprioception; Nage; Auto-propulsion; Modélisation du muscle; Fluid-structure interaction; Finite element method; Panel methods; Proprioception; Swimming; Self-propulsion; Muscle modelization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gross, D. (2019). Nage sous marine générée par boucle de rétroaction de courbure avec modélisation de muscles locomoteurs : Self-propelled swimming by means of curvature-based feedback and muscle like elements. (Doctoral Dissertation). Université Côte d'Azur (ComUE). Retrieved from http://www.theses.fr/2019AZUR4053

Chicago Manual of Style (16^th Edition):

Gross, David. “Nage sous marine générée par boucle de rétroaction de courbure avec modélisation de muscles locomoteurs : Self-propelled swimming by means of curvature-based feedback and muscle like elements.” 2019. Doctoral Dissertation, Université Côte d'Azur (ComUE). Accessed April 16, 2021. http://www.theses.fr/2019AZUR4053.

MLA Handbook (7^th Edition):

Gross, David. “Nage sous marine générée par boucle de rétroaction de courbure avec modélisation de muscles locomoteurs : Self-propelled swimming by means of curvature-based feedback and muscle like elements.” 2019. Web. 16 Apr 2021.

Vancouver:

Gross D. Nage sous marine générée par boucle de rétroaction de courbure avec modélisation de muscles locomoteurs : Self-propelled swimming by means of curvature-based feedback and muscle like elements. [Internet] [Doctoral dissertation]. Université Côte d'Azur (ComUE); 2019. [cited 2021 Apr 16]. Available from: http://www.theses.fr/2019AZUR4053.

Council of Science Editors:

Gross D. Nage sous marine générée par boucle de rétroaction de courbure avec modélisation de muscles locomoteurs : Self-propelled swimming by means of curvature-based feedback and muscle like elements. [Doctoral Dissertation]. Université Côte d'Azur (ComUE); 2019. Available from: http://www.theses.fr/2019AZUR4053

15. ANG SZE JIUNN. Numerical Simulation of Moving Boundary Problems with Application to Fish Swimming.

Degree: 2008, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/13187

Subjects/Keywords: Meshless; hybrid meshfree-Cartesian grid; SVD; GFD; close interactions; fluid structure interaction; deforming body; fish swimming; self propulsion.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

JIUNN, A. S. (2008). Numerical Simulation of Moving Boundary Problems with Application to Fish Swimming. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/13187

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

JIUNN, ANG SZE. “Numerical Simulation of Moving Boundary Problems with Application to Fish Swimming.” 2008. Thesis, National University of Singapore. Accessed April 16, 2021. http://scholarbank.nus.edu.sg/handle/10635/13187.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

JIUNN, ANG SZE. “Numerical Simulation of Moving Boundary Problems with Application to Fish Swimming.” 2008. Web. 16 Apr 2021.

Vancouver:

JIUNN AS. Numerical Simulation of Moving Boundary Problems with Application to Fish Swimming. [Internet] [Thesis]. National University of Singapore; 2008. [cited 2021 Apr 16]. Available from: http://scholarbank.nus.edu.sg/handle/10635/13187.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

JIUNN AS. Numerical Simulation of Moving Boundary Problems with Application to Fish Swimming. [Thesis]. National University of Singapore; 2008. Available from: http://scholarbank.nus.edu.sg/handle/10635/13187

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

16. Garcia Gonzalez, Jesus. NUMERICAL ANALYSIS OF FLUID MOTION AT LOW REYNOLDS NUMBERS.

Degree: 2017, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308718

► At low Reynolds number flows, the effect of inertia becomes negligible and the fluid motion is dominated by the effect of viscous forces. Understanding of… (more)

▼ At low Reynolds number flows, the effect of inertia becomes negligible and the fluid motion is dominated by the effect of viscous forces. Understanding of the behaviour of low Reynolds number flows underpins the prediction of the motion of microorganisms and particle sedimentation as well as the development of micro-robots that could potentially swim inside the human body to perform targeted drug/cell delivery and non-invasive microsurgery. The work in this thesis focuses on developing an understanding in the mathematical analysis of objects moving at low Reynolds numbers. A boundary element implementation of the Method of regularized Stokeslets (MRS) is applied to analyse the low Reynolds number flow field around an object of simple shape (sphere and cube). It also showed that the results obtained by a boundary element implementation for an unbounded cube, where singularities are presented in the corners of the cube, agrees with more complex solutions methods such as a GBEM and FEM.A methodology for analysing the effect of walls by locating collocation points on the surface of the walls and the object is presented. First at all, this methodology is validated with a boundary element implementation of the method of images for a sphere at different locations. Then, the method is extended when more than one wall is presented. This methodology is applied to predict the velocity filed of a cube moving in a tow tank at low Reynolds numbers for two different cases with a supporting rod similar to an experimental set-up, and without the supporting rod as in the CFD simulations based on the FVM. The results indicate a good match between CFD and the MRS, and an excellent approximation between the MRS and experimental data from PIV measurements.The drag, thrust and torque generated by helices moving at low Reynolds numbers in an unbounded medium is analysed by the resistive force theory, a slender body theory, and a boundary element method of the MRS. The results show that the resistive force theory predict accurately the drag, thrust and torque of moving helices when the resistive force coefficients are calculated from a slender body theory approximation by calculating independently the resistive force coefficients for translation and rotation, because it is observed that the resistive force coefficients depend also of the nature of motion. Moreover, the thrust generated by helices of different pitch angles is analysed calculated by a CFD numerical simulation based on the FVM and a boundary element implementation, an compared with experimental data. The results also show an excellent prediction between the boundary element implementation, the CFD results and the experimental data. Finally, a boundary element implementation of the MRS is applied to predict swimming of a biomimetic swimmer that mimics the motion of E.coli bacteria in an unbounded medium. The results are compared with the propulsive velocity and induced angular velocity measurement by recording the motion of the biomimetic swimmer in a square tank. It is… Advisors/Committee Members: ALONSO RASGADO, TERESA TM, Alonso Rasgado, Teresa, Zhong, Shan.

Subjects/Keywords: Low Reynolds Numbers; Stokes equations; Collocation methods; Method of regularized Stokeslets; Boundary element implementation; Slender Body Theory; Resistive Force Theory; Helical Propulsion; Swimming Propulsion; Biomimetic Swimmer

…6.1: Schematic model of the swimmer prototype based on helical propulsion (Zhong et al… …168 Figure 6.7: Comparison of the propulsion velocity of the biomimetic swimmer for… …of the propulsion velocity of the biomimetic swimmer for different pitch angle between the… …175 Figure 6.13: Non-dimensional swimming velocity of the biomimetic swimmer against the… …coefficients obtained by a SBT implementation.................. 176 Figure 6.14: Swimming efficiency…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Garcia Gonzalez, J. (2017). NUMERICAL ANALYSIS OF FLUID MOTION AT LOW REYNOLDS NUMBERS. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308718

Chicago Manual of Style (16^th Edition):

Garcia Gonzalez, Jesus. “NUMERICAL ANALYSIS OF FLUID MOTION AT LOW REYNOLDS NUMBERS.” 2017. Doctoral Dissertation, University of Manchester. Accessed April 16, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308718.

MLA Handbook (7^th Edition):

Garcia Gonzalez, Jesus. “NUMERICAL ANALYSIS OF FLUID MOTION AT LOW REYNOLDS NUMBERS.” 2017. Web. 16 Apr 2021.

Vancouver:

Garcia Gonzalez J. NUMERICAL ANALYSIS OF FLUID MOTION AT LOW REYNOLDS NUMBERS. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Apr 16]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308718.

Council of Science Editors:

Garcia Gonzalez J. NUMERICAL ANALYSIS OF FLUID MOTION AT LOW REYNOLDS NUMBERS. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308718

17. Garcia Gonzalez, Jesus. Numerical analysis of fluid motion at low Reynolds numbers.

Degree: PhD, 2017, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/numerical-analysis-of-fluid-motion-at-low-reynolds-numbers(4cf30194-0155-439d-879a-c49787549e8c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727987

► At low Reynolds number flows, the effect of inertia becomes negligible and the fluid motion is dominated by the effect of viscous forces. Understanding of… (more)

▼ At low Reynolds number flows, the effect of inertia becomes negligible and the fluid motion is dominated by the effect of viscous forces. Understanding of the behaviour of low Reynolds number flows underpins the prediction of the motion of microorganisms and particle sedimentation as well as the development of micro-robots that could potentially swim inside the human body to perform targeted drug/cell delivery and non-invasive microsurgery. The work in this thesis focuses on developing an understanding in the mathematical analysis of objects moving at low Reynolds numbers. A boundary element implementation of the Method of regularized Stokeslets (MRS) is applied to analyse the low Reynolds number flow field around an object of simple shape (sphere and cube). It also showed that the results obtained by a boundary element implementation for an unbounded cube, where singularities are presented in the corners of the cube, agrees with more complex solutions methods such as a GBEM and FEM.A methodology for analysing the effect of walls by locating collocation points on the surface of the walls and the object is presented. First at all, this methodology is validated with a boundary element implementation of the method of images for a sphere at different locations. Then, the method is extended when more than one wall is presented. This methodology is applied to predict the velocity filed of a cube moving in a tow tank at low Reynolds numbers for two different cases with a supporting rod similar to an experimental set-up, and without the supporting rod as in the CFD simulations based on the FVM. The results indicate a good match between CFD and the MRS, and an excellent approximation between the MRS and experimental data from PIV measurements. The drag, thrust and torque generated by helices moving at low Reynolds numbers in an unbounded medium is analysed by the resistive force theory, a slender body theory, and a boundary element method of the MRS. The results show that the resistive force theory predict accurately the drag, thrust and torque of moving helices when the resistive force coefficients are calculated from a slender body theory approximation by calculating independently the resistive force coefficients for translation and rotation, because it is observed that the resistive force coefficients depend also of the nature of motion. Moreover, the thrust generated by helices of different pitch angles is analysed calculated by a CFD numerical simulation based on the FVM and a boundary element implementation, an compared with experimental data. The results also show an excellent prediction between the boundary element implementation, the CFD results and the experimental data. Finally, a boundary element implementation of the MRS is applied to predict swimming of a biomimetic swimmer that mimics the motion of E.coli bacteria in an unbounded medium. The results are compared with the propulsive velocity and induced angular velocity measurement by recording the motion of the biomimetic swimmer in a square tank. It is…

Subjects/Keywords: 629.132; Method of regularized Stokeslets; Helical Propulsion; Resistive Force Theory; Slender Body Theory; Collocation methods; Swimming Propulsion; Stokes equations; Low Reynolds Numbers; Boundary element implementation; Biomimetic Swimmer

…6.1: Schematic model of the swimmer prototype based on helical propulsion (Zhong et al… …168 Figure 6.7: Comparison of the propulsion velocity of the biomimetic swimmer for… …of the propulsion velocity of the biomimetic swimmer for different pitch angle between the… …175 Figure 6.13: Non-dimensional swimming velocity of the biomimetic swimmer against the… …coefficients obtained by a SBT implementation.................. 176 Figure 6.14: Swimming efficiency…

10 more images…

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❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Garcia Gonzalez, J. (2017). Numerical analysis of fluid motion at low Reynolds numbers. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/numerical-analysis-of-fluid-motion-at-low-reynolds-numbers(4cf30194-0155-439d-879a-c49787549e8c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727987

Chicago Manual of Style (16^th Edition):

Garcia Gonzalez, Jesus. “Numerical analysis of fluid motion at low Reynolds numbers.” 2017. Doctoral Dissertation, University of Manchester. Accessed April 16, 2021. https://www.research.manchester.ac.uk/portal/en/theses/numerical-analysis-of-fluid-motion-at-low-reynolds-numbers(4cf30194-0155-439d-879a-c49787549e8c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727987.

MLA Handbook (7^th Edition):

Garcia Gonzalez, Jesus. “Numerical analysis of fluid motion at low Reynolds numbers.” 2017. Web. 16 Apr 2021.

Vancouver:

Garcia Gonzalez J. Numerical analysis of fluid motion at low Reynolds numbers. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Apr 16]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/numerical-analysis-of-fluid-motion-at-low-reynolds-numbers(4cf30194-0155-439d-879a-c49787549e8c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727987.

Council of Science Editors:

Garcia Gonzalez J. Numerical analysis of fluid motion at low Reynolds numbers. [Doctoral Dissertation]. University of Manchester; 2017. Available from: https://www.research.manchester.ac.uk/portal/en/theses/numerical-analysis-of-fluid-motion-at-low-reynolds-numbers(4cf30194-0155-439d-879a-c49787549e8c).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.727987

University of Cambridge

18. Katsamba, Panayiota. Biophysics of helices : devices, bacteria and viruses.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566

► A prevalent morphology in the microscopic world of artificial microswimmers, bacteria and viruses is that of a helix. The intriguingly different physics at play at… (more)

▼ A prevalent morphology in the microscopic world of artificial microswimmers, bacteria and viruses is that of a helix. The intriguingly different physics at play at the small scale level make it necessary for bacteria to employ swimming strategies different from our everyday experience, such as the rotation of a helical filament. Bio-inspired microswimmers that mimic bacterial locomotion achieve propulsion at the microscale level using magnetically actuated, rotating helical filaments. A promising application of these artificial microswimmers is in non-invasive medicine, for drug delivery to tumours or microsurgery. Two crucial features need to be addressed in the design of microswimmers. First, the ability to selectively control large ensembles and second, the adaptivity to move through complex conduit geometries, such as the constrictions and curves of the tortuous tumour microvasculature. In this dissertation, a mechanics-based selective control mechanism for magnetic microswimmers is proposed, and a model and simulation of an elastic helix passing through a constricted microchannel are developed. Thereafter, a theoretical framework is developed for the propulsion by stiff elastic filaments in viscous fluids. In order to address this fluid-structure problem, a pertubative, asymptotic, elastohydrodynamic approach is used to characterise the deformation that arises from and in turn affects the motion. This framework is applied to the helical filaments of bacteria and magnetically actuated microswimmers. The dissertation then turns to the sub-bacterial scale of bacteriophage viruses, 'phages' for short, that infect bacteria by ejecting their genetic material and replicating inside their host. The valuable insight that phages can offer in our fight against pathogenic bacteria and the possibility of phage therapy as an alternative to antibiotics, are of paramount importance to tackle antibiotics resistance. In contrast to typical phages, flagellotropic phages first attach to bacterial flagella, and have the striking ability to reach the cell body for infection, despite their lack of independent motion. The last part of the dissertation develops the first theoretical model for the nut-and-bolt mechanism (proposed by Berg and Anderson in 1973). A nut being rotated will move along a bolt. Similarly, a phage wraps itself around a flagellum possessing helical grooves, and exploits the rotation of the flagellum in order to passively travel along and towards the cell body, according to this mechanism. The predictions from the model agree with experimental observations with respect to directionality, speed and the requirements for succesful translocation.

Subjects/Keywords: 571.4; helix; bacteria; virus; phage; bacteriophage; microswimmer; filament; slender; selective control; magnetic actuation; propulsion; application-driven design; elasticity; elastohydrodynamics; fluid-structure interaction; constriction; complex conduit; adaptive design; deformation; nut-and-bolt mechanism; flagellotropic; flagellum; bacterium; translocation; microscale; fluid mechanics; artificial-microswimmer; deformation feedback to kinematics; swimming; device; targeted-drug delivery; microfluidics; micromanipulation; minimally-invasive medical applications; biophysics; mechanics; biomechanics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Katsamba, P. (2018). Biophysics of helices : devices, bacteria and viruses. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566

Chicago Manual of Style (16^th Edition):

Katsamba, Panayiota. “Biophysics of helices : devices, bacteria and viruses.” 2018. Doctoral Dissertation, University of Cambridge. Accessed April 16, 2021. https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566.

MLA Handbook (7^th Edition):

Katsamba, Panayiota. “Biophysics of helices : devices, bacteria and viruses.” 2018. Web. 16 Apr 2021.

Vancouver:

Katsamba P. Biophysics of helices : devices, bacteria and viruses. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Apr 16]. Available from: https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566.

Council of Science Editors:

Katsamba P. Biophysics of helices : devices, bacteria and viruses. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.30371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763566

ETH Zürich

19. Jordi, Christa. Biomimetic airship driven by dielectric elastomer actuators.

Degree: 2011, ETH Zürich

URL: http://hdl.handle.net/20.500.11850/45726

Subjects/Keywords: BIONICS; LUFTSCHIFFE (AERODYNAMIK); ELASTOMERS, SYNTHETIC RUBBER (PLASTICS); SMART MATERIALS; DIELEKTRISCHE STOFFE + ISOLIERSTOFFE (ELEKTROTECHNIK); DIELECTRIC MATERIALS + INSULATING MATERIALS (ELECTRICAL ENGINEERING); AIRSHIPS (AERONAUTICAL ENGINEERING); ANTRIEBSSYSTEME (LUFTFAHRTTECHNIK); INTELLIGENTE MATERIALIEN; POLYMER COMPOUND MATERIALS AND FIBRE REINFORCED PLASTICS; PROPULSION SYSTEMS (AERONAUTICAL ENGINEERING); SWIMMING (ANIMAL PHYSIOLOGY); ELASTOMERE, SYNTHETISCHER GUMMI (KUNSTSTOFFE); SCHWIMMEN (TIERPHYSIOLOGIE); LUFTSCHIFFE (LUFTFAHRTTECHNIK); AIRSHIPS (AERODYNAMICS); BIONIK; POLYMERE VERBUNDWERKSTOFFE UND FASERVERSTÄRKTE KUNSTSTOFFE; info:eu-repo/classification/ddc/620; Engineering & allied operations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jordi, C. (2011). Biomimetic airship driven by dielectric elastomer actuators. (Doctoral Dissertation). ETH Zürich. Retrieved from http://hdl.handle.net/20.500.11850/45726

Chicago Manual of Style (16^th Edition):

Jordi, Christa. “Biomimetic airship driven by dielectric elastomer actuators.” 2011. Doctoral Dissertation, ETH Zürich. Accessed April 16, 2021. http://hdl.handle.net/20.500.11850/45726.

MLA Handbook (7^th Edition):

Jordi, Christa. “Biomimetic airship driven by dielectric elastomer actuators.” 2011. Web. 16 Apr 2021.

Vancouver:

Jordi C. Biomimetic airship driven by dielectric elastomer actuators. [Internet] [Doctoral dissertation]. ETH Zürich; 2011. [cited 2021 Apr 16]. Available from: http://hdl.handle.net/20.500.11850/45726.

Council of Science Editors:

Jordi C. Biomimetic airship driven by dielectric elastomer actuators. [Doctoral Dissertation]. ETH Zürich; 2011. Available from: http://hdl.handle.net/20.500.11850/45726

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