Relevant bibliographies by topics / Tether

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Tether'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 June 2025

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Journal articles on the topic "Tether"

1

Ahn, Yohan, Woojae Jang, Jeonga Lee, and Jintai Chung. "Dynamic Analysis of Tethered Satellites with a Payload Moving Along a Flexible Tether." Applied Sciences 14, no. 20 (2024): 9498. http://dx.doi.org/10.3390/app14209498.

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This study investigates the dynamic behavior of a three-body tethered satellite system with a flexible tether, focusing on a scenario in which a payload is transported along the tether connecting two satellites. Traditional models use rigid tethers, limiting the analysis of complex dynamics such as tether deformation, slack, and rebound. To address these limitations, we employed the absolute nodal coordinate formulation (ANCF) to model the flexibility of the tether. We derived nonlinear equations of motion using Lagrange’s equation and solved them using the Newmark time integration method to obtain the dynamic responses of the satellite system. Our findings revealed that the Coriolis effect caused significant deviations in the payload trajectory as its mass and speed increased, leading to greater tether deformation and slack, and potential system destabilization. Additionally, axial force fluctuations in the tether varied notably as the payload moved, transitioning between tensile and compressive states. This study provides a more accurate representation of three-body tethered satellite systems by incorporating tether flexibility, offering valuable insights into the dynamic behavior and stability of the system.
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Ledkov, A. S., and R. S. Pikalov. "Nonlinear Control of Tether Retrieval in an Elliptical Orbit." Nelineinaya Dinamika 19, no. 1 (2023): 0. http://dx.doi.org/10.20537/nd230401.

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Tether retrieval is an important stage in many projects using space tether systems. It is known that uniform retrieval is an unstable process that leads to the winding of the tether on a satellite at the final stage of retraction. This is a serious obstacle to the practical application of space tethers in the tasks of climbing payloads to a satellite and docking the spacecraft with a tethered satellite after its capture. The paper investigates the plane motion of a space tether system with a massless tether of variable length in an elliptical orbit. A new control law that ensures the retrieval of the tether without increasing the amplitude of oscillations at the final stage is proposed. The asymptotic stability of the space tether system’s controlled motion in an elliptical orbit is proved. A numerical analysis of tether retrieval is carried out. The influence of the eccentricity of the orbit on the retrieval process is investigated. The results of the work can be useful in preparing missions of the active space debris removal and in performing operations involving tether retrieval.
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Hong, Aaron Aw Teik, and Renuganth Varatharajoo. "Tether Tension Performance Utilizing Various Materials for a Coplanar and Non-Coplanar Model of a Flexible Tethered Satellite System." Applied Mechanics and Materials 629 (October 2014): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amm.629.281.

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This paper presents a numerical model for a flexible tethered satellite system in both planar and co-planar environment. This tethered satellite system consists of three rigid bodies with two flexible tethers, each connecting two rigid bodies with one located in the center serving as the mothership. The dynamics of the system include tether deformations, rotational dynamics and orbital mechanics. Five different materials that are commonly used will be tested accordingly in order to observe its performance based on the tension of the tether. It is found that, based on all of the materials simulated, diamond has the best tension performance.
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Chen, Yi, Rui Huang, Xianlin Ren, Liping He, and Ye He. "History of the Tether Concept and Tether Missions: A Review." ISRN Astronomy and Astrophysics 2013 (February 14, 2013): 1–7. http://dx.doi.org/10.1155/2013/502973.

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This paper introduces history of space tethers, including tether concepts and tether missions, and attempts to provide a source of references for historical understanding of space tethers. Several concepts of space tethers since the original concept has been conceived are listed in the literature, as well as a summary of interesting applications, and a research of space tethers is given. With the aim of implementing scientific experiments in aerospace, several space tether missions which have been delivered for aerospace application are introduced in the literature.
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Cartmell, Matthew, Olga Ganilova, Eoin Lennon, and Gavin Shuttleworth. "Motorised momentum exchange space tethers: the dynamics of asymmetrical tethers, and some recent new applications." MATEC Web of Conferences 148 (2018): 01001. http://dx.doi.org/10.1051/matecconf/201814801001.

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This paper reports on a first attempt to model the dynamics of an asymmetrical motorised momentum exchange tether for spacecraft payload propulsion, and it also provides some interesting summary results for two novel applications for motorised momentum exchange tethers. The asymmetrical tether analysis is very important because it represents the problematic scenario when payload mass unbalance intrudes, due to unexpected payload loss or failure to retrieve. Mass symmetry is highly desirable both dynamically and logistically, but it is shown in this paper that there is still realistic potential for mission rescue should an asymmetry condition arise. Conceptual designs for tethered payload release from LEO and lunar tether delivery and retrieval are also presented as options for future development.
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Brekke, J. N., and T. N. Gardner. "Analysis of Brief Tension Loss in TLP Tethers." Journal of Offshore Mechanics and Arctic Engineering 110, no. 1 (1988): 43–47. http://dx.doi.org/10.1115/1.3257122.

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The avoidance of “slack” tethers is one of the factors which may establish the required tether pretension in a tension leg platform (TLP) design. Selection of an appropriate safety factor on loss of tension depends on how severe the consequences may be. It is sometimes argued that if tethers go slack, the result may be excessive platform pitch or roll motions, tether buckling, or “snap” or “snatch” loading of the tether. The results reported here show that a four-legged TLP would not be susceptible to larger angular motions until two adjacent legs lose tension simultaneously. Even then, this analysis shows that a brief period of tether tension loss (during the passage of a large wave trough) does not lead to excessive platform motion. Similarly, momentary tension loss does not cause large bending stress in the tether or significant tension amplification as the tether undergoes retensioning. This paper presents TLP platform and tether response analysis results for a representative deepwater Gulf of Mexico TLP with large-diameter, self-buoyant tethers. The time-domain, dynamic computer analysis included nonlinear effects and platform/tether coupling.
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Shapovalov, Danylo, and Guilherme A. S. Pereira. "Tangle-Free Exploration with a Tethered Mobile Robot." Remote Sensing 12, no. 23 (2020): 3858. http://dx.doi.org/10.3390/rs12233858.

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Exploration and remote sensing with mobile robots is a well known field of research, but current solutions cannot be directly applied for tethered robots. In some applications, tethers may be very important to provide power or allow communication with the robot. This paper presents an exploration algorithm that guarantees complete exploration of arbitrary environments within the length constraint of the tether, while keeping the tether tangle-free at all times. While we also propose a generalized algorithm that can be used with several exploration strategies, our implementation uses a modified frontier-based exploration approach, where the robot chooses its next goal in the frontier between explored and unexplored regions of the environment. The basic idea of the algorithm is to keep an estimate of the tether configuration, including length and homotopy, and decide the next robot path based on the difference between the current tether length and the shortest tether length at the next goal position. Our algorithm is provable correct and was tested and evaluated using both simulations and real-world experiments.
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Toivanen, Petri, Pekka Janhunen, Jarmo Kivekäs, and Meri Mäkelä. "Robust Flight Tether for In-Orbit Demonstrations of Coulomb Drag Propulsion." Aerospace 11, no. 1 (2024): 62. http://dx.doi.org/10.3390/aerospace11010062.

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A new method of producing robust multi-wire tethers for Coulomb drag applications was developed. The multi-wire structure required for redundancy against the micrometeoroid flux of the space environment is realised through the method of wire twist bonding traditionally used for chicken wire. In the case of the Coulomb drag tether, the diameter of the individual wires is 50 μm, which introduces the main technological challenge. To manufacture the tether, a manually driven tether machine was designed and built. Two multi-wire tethers for Coulomb drag applications were produced for two in-orbit demonstrations of the FORESAIL-1 and ESTCube-2 CubeSat missions. The flight tethers were both 60 m long as produced, clearly demonstrating beyond the level of proof of concept the applicability of both the method and the manually driven tether machine. Altogether, 6480 twist bonds were produced without a single wire cut. In this paper, the requirements for the tether are listed and justified. The production method is reviewed, and the 4-wire tether produced is evaluated against the requirements. Finally, the test procedures of the tether are described, and on the basis of the results, it is concluded that the tether can tolerate a tension of 14 g without the twist bonds slipping or the tether structure collectively collapsing. Furthermore, the tether can be reeled from the production reel to the flight reel, which simplifies the final integration of the tether reeling system with the Coulomb drag propulsion device.
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Ledkova, T. A., and Yu M. Zabolotnov. "Deployment and stabilization of the motion of a space tethered system in a lunar orbit." VESTNIK of Samara University. Aerospace and Mechanical Engineering 20, no. 2 (2021): 63–73. http://dx.doi.org/10.18287/2541-7533-2021-20-2-63-73.

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The motion of a space tether system, consisting of a constellation of two microsatellites and a space station, is investigated. The station moves in a circular undisturbed circular lunar orbit. The process of deployment of tethers to bring the system into a working near-vertical condition is considered. A program for controlling the tether tension force that ensures the deployment of tethers to the required length and stabilizes the system in the vertical position is proposed. A study of the stability of the equilibrium position of a mechanical system is carried out. It is shown that the motion carried out during the deployment of a tethered system according to the program proposed in the work is asymptotically stable.
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Alon, Ronen, Shuqi Chen, Kamal D. Puri, Erik B. Finger, and Timothy A. Springer. "The Kinetics of L-selectin Tethers and the Mechanics of Selectin-mediated Rolling." Journal of Cell Biology 138, no. 5 (1997): 1169–80. http://dx.doi.org/10.1083/jcb.138.5.1169.

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Two mechanisms have been proposed for regulating rolling velocities on selectins. These are (a) the intrinsic kinetics of bond dissociation, and (b) the reactive compliance, i.e., the susceptibility of the bond dissociation reaction to applied force. To determine which of these mechanisms explains the 7.5–11.5-fold faster rolling of leukocytes on L-selectin than on E- and P-selectins, we have compared the three selectins by examining the dissociation of transient tethers. We find that the intrinsic kinetics for tether bond dissociation are 7–10-fold more rapid for L-selectin than for E- and P-selectins, and are proportional to the rolling velocities through these selectins. The durations of pauses during rolling correspond to the duration of transient tethers on low density substrates. Moreover, applied force increases dissociation kinetics less for L-selectin than for E- and P-selectins, demonstrating that reactive compliance is not responsible for the faster rolling through L-selectin. Further measurements provide a biochemical and biophysical framework for understanding the molecular basis of rolling. Displacements of tethered cells during flow reversal, and measurements of the distance between successive pauses during rolling provide estimates of the length of a tether and the length of the adhesive contact zone, and suggest that rolling occurs with as few as two tethers per contact zone. Tether bond lifetime is an exponential function of the force on the bond, and the upper limit for the tether bond spring constant is of the same order of magnitude as the estimated elastic spring constant of the lectin–EGF unit. Shear uniquely enhances the rate of L-selectin transient tether formation, and conversion of tethers to rolling adhesions, providing further understanding of the shear threshold requirement for rolling through L-selectin.
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Dissertations / Theses on the topic "Tether"

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Brewster, Wayne Allan. "Space tether - radar data processing." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA289654.

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Thesis (M.S. in Electrical Engineering and M.S. in Applied Physics) Naval Postgraduate School, September 1994.<br>Thesis advisor(s): Richard Christopher Olsen, Ralph Hippenstiel. "September 1994." Bibliography: p. 71. Also available online.
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Manowitz, David H. (David Howard) 1976. "Three-dimensional tether awareness trainer." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80546.

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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.<br>Includes bibliographical references (leaves 53-54).<br>by David H. Manowitz.<br>S.B.and M.Eng.
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Mantri, Parag. "Deployment Dynamic of Space Tether Systems." NCSU, 2007. http://www.lib.ncsu.edu/theses/available/etd-06202007-100101/.

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The purpose of this research is to model and understand the deployment dynamics of space systems with long and short tethers. This research is divided into two parts; in the first part, a model for short and medium length tether systems is developed and simulated by solving equations of motion. A detailed parametric study is conducted after identifying important parameters affecting the deployment and studying the effect of each parameter on the deployment performance. Certain tools are developed to assist mission planners in predicting the deployment performance of a space tether system for a given set of parameters. The second part of the research is motivated by Space Elevator (SE) dynamics. SE is a futuristic and highly challenging technology based on the idea of connecting Earth and Space by an approximately 100,000 km long tether. The tether used for the SE would be deployed from Geostationary Orbit(GEO). With this motivation, the short tether analysis from the previous section is extended to the analysis of long tethers. A model for long tether deployment is developed and governing equations of motions are formulated. Critical parameters are identified and problems involved in SE deployment are investigated. Tether mass is initially included in the model, but it is found that that the mass of the tether has very little effect on the overall qualitative dynamics of the system. Hence, for further analysis, a massless tether model is adapted. Upon simulating the system, it is found that long tethers can be highly unstable during deployment and can crash onto the Earth. However, a considerable fraction of the tether can be deployed successfully without any external control mechanism before the instability manifests itself. Hence, alternate SE designs with shorter tether deployment requirements may be a possibility.
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Mankala, Kalyan K. "Satellite tether systems dynamic modeling and control /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 4.07 Mb., 233 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3220809.

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McLeary, Alwyn. "Dynamic response of TLPs during tether installation." Thesis, University of Glasgow, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394952.

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Gavit, Sarah A. "Varying tether lengths for modifying orbital eccentricities." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15236.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND AERO.<br>Includes bibliographical references.<br>by Sarah K. Gavit.<br>M.S.
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Rajan, Vishnu Arun Kumar Thumatty. "Tether management techniques for autonomous mobile robots." Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517864.

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Hussain, Mazhar. "Cyclopentadienyl nickel complexes bearing a pendant phosphane tether." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979445892.

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Min, Byung No. "Non-linear free vibration of a spinning tether." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29616.pdf.

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Min, Byung No 1967. "Non-linear free vibration of a spinning tether." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27243.

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Non-linear vibration of a spinning tether is studied in this thesis. The tether is thought to be a part of a spinning tethered satellite system in the station-keeping phase so that the tether has a constant nominal length and is forced to spin at a constant rate about its nominal axis. Using the extended Hamilton's principle the governing equations of motion are derived retaining non-linear terms up to the third order that originate from geometric non-linearity. They are discretized by the assumed-modes method, truncated to one-mode equations, and transformed to the phase-space form. Then the method of averaging is applied.<br>When the tether has high nominal tension, averaging with two variables results in a closed form solution, which shows dependence of the frequency contents on the initial amplitude parameters of the system. In the case of very low nominal tension, averaging with a single variable is useful to obtain the steady state and the limit steady state solutions, both of which result in a circular whirling motion like a skip-rope. Without damping, a general transverse mode appears to be quasi-periodic but it can be periodic under certain initial conditions. Numerical investigations reveal that the material damping through the longitudinal mode derives the steady state to the limit steady state. Also, several interesting shapes are observed in phase plots.
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Books on the topic "Tether"

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United States. National Aeronautics and Space Administration., ed. Tether applications: Interim report. Control Dynamics, 1986.

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(Firm), Lockheed Martin Astronautics, and United States. National Aeronautics and Space Administration., eds. Atmospheric tether mission analyses. National Aeronautics and Space Administration, 1996.

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Whitt, Laurelyn. Tether. Seraphim Editions, 2013.

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Robinson, Jeremy. Tether. Breakneck Media, 2019.

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Jarzab, Anna. Tether. Random House Books for Young Readers, 2016.

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Tether. Creative Media Partners, LLC, 2023.

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Jarzab, Anna. Tether. Random House Australia, 2015.

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Tether. Spout Press, 2013.

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tether. Black Lawrence Press, 2020.

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Tether. Independently Published, 2021.

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Book chapters on the topic "Tether"

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Sasaki, S., and K. Oyama. "Space Tether Experiment." In Environmental and Space Electromagnetics. Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68162-5_4.

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Storey, L. R. O. "The Shuttle Electrodynamic Tether Mission." In Environmental and Space Electromagnetics. Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68162-5_2.

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Takehara, Shoichiro, Takahiro Nishizawa, Masaya Kawarada, Kazunori Hase, and Yoshiaki Terumichi. "Development of Tether Space Mobility Device." In Computational Methods in Applied Sciences. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07260-9_11.

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Cunning, David. "The limits of our metaphysical tether." In Descartes. Routledge, 2023. http://dx.doi.org/10.4324/9781351210522-3.

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Chen, Yi, and Yun Li. "Space Tether for Payload Orbital Transfer." In Computational Intelligence Assisted Design. CRC Press, 2018. http://dx.doi.org/10.1201/9781315153179-17.

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Quack, Salina, and David Dulin. "Surface Functionalization, Nucleic Acid Tether Characterization, and Force Calibration for a Magnetic Tweezers Assay." In Single Molecule Analysis. Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-3377-9_19.

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AbstractMagnetic tweezers are a force spectroscopy single-molecule technique. They enable the mechanical manipulation of biomolecules via the means of a magnetic particle under an attractive force applied by a magnetic field source. The magnetic particle is tethered to the glass surface of a flow chamber by the biomolecule, and functionalization strategies have been developed to reduce the nonspecific interactions of either the magnetic particles or biomolecules with the surface. Here, we describe two complementary strategies to achieve a high tether density while reducing the interactions of both the magnetic particle and the biomolecule of interest with the glass surface. Using a large detector CMOS camera, the simultaneous observation of several hundreds of tethered magnetic beads is achievable, allowing high-throughput single-molecule measurements. We further describe here a simple procedure to perform the calibration in force of a magnetic tweezers assay.
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Bigi, Nedeleg, Alain Nême, Kostia Roncin, et al. "Analytical Tether Model for Static Kite Flight." In Airborne Wind Energy. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-1947-0_3.

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Vinha, Sérgio, Gabriel M. Fernandes, and Fernando A. C. C. Fontes. "Circular Take-Off and Landing of Tethered Aircraft with Variable Tether Length." In Lecture Notes in Electrical Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-81724-3_43.

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James, H. G. "Tether Phenomena Observed in the OEDIPUS-A Experiment." In The Behavior of Systems in the Space Environment. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2048-7_24.

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Kojima, Junichi, Yuichi Shirasaki, and Kenichi Asakawa. "Measurement and Analysis of Hydrodynamics of ROV’s Tether Cable." In ROV ’86: Remotely Operated Vehicles. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4207-3_5.

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Conference papers on the topic "Tether"

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Bouchard, Etienne, David Rancourt, and Dimitri Mavris. "Design Space Exploration of an Electric-Powered Reconfigurable Rotor VTOL Concept." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10504.

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This paper presents the design space exploration of a novel concept capable of lifting tethered payloads. The system uses unmanned electric tethered aircraft capable of vertical takeoff, which then transition to a circular flight to lift the payload, and even to a horizontal flight to travel at a greater speed. The system takes advantages of the tether to transfer power from the payload or the ground station to the aircraft, which allows the aircraft to be light and takeoff vertically. A thorough description of the concept and details on the operating phases are given. A physical breakdown of the system is performed and four physics-based models are constructed: propeller efficiency, wing aerodynamics, tether and electric power production unit. An optimizer is then used to maximize the payload for a given available power. It is shown that a 40 kW, two 8 m span aircraft system can lift a 770 kg payload, and that a 1,200 kW, two 28 m span aircraft system can lift a 18,700 kg payload. Finally, a sensitivity analysis showed that the assumptions involved in the modeling of the rotor and the tether drag have significant impact on the payload capability, while the vehicle mass does not.
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Faisal, Ahmad, and Faith Tng. "Rigid Electrodynamic Tether System (RETS)." In 22nd IAA Symposium on Space Debris, Held at the 75th International Astronautical Congress (IAC 2024). International Astronautical Federation (IAF), 2024. https://doi.org/10.52202/078360-0055.

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Koukpaizan, Nicholson, Jagadeesh Movva, Marin Butori, and Marilyn Smith. "Accurate Real-Time Extensible Simulations of Dynamic Bodies." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12109.

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A model-based simulation technique has recently been developed and is being transitioned for use in two-body aerodynamic-dynamic problems of interest (slung loads, airdrops) to the vertical lift community. This model, the Georgia Tech Aerodynamics for Bluff Bodies (GTABB), has been shown to accurately predict the behavior of rectangular loads, validated with both computational fluid dynamics and flight test. This paper presents additional validation of the GTABB solver and its six degree of freedom dynamic modeling tool (6DOF) with flight test on new slung load configurations that are connected via either a hook or a gimbal. A new tether algorithm capable of modeling wind-up is demonstrated. In addition, the introduction of a long tether model in 6DOF and a graphical user interface to rapidly build and analyze, visually and quantitatively, tethered load simulations are described. In this paper, a new pre-processor that develops the quasi-steady data tables for arbitrary configurations, COMPlex Aerodynamic Shape Simulator (COMPASS), is introduced with initial verification and validation, demonstrating a concept first introduced in 2011-2012. COMPASS demonstrates the ability to reconstruct the dynamic mechanisms responsible for driving the motion of two-body aerodynamic-dynamic problems.
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Breese, Bennett, Drew Scott, Shraddha Barawkar, and Manish Kumar. "Fuzzy Logic Controller for Force Feedback Control of Quadcopter via Tether." In ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3275.

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Abstract Tethered drone systems can be used to perform long-endurance tasks such as area surveillance and relay stations for wireless communication. However, all the existing systems use tethers only for data and power transmission from a stationary point on the ground. This work presents a control strategy that enables a quadcopter to follow a moving tether anchor. A force feedback controller is implemented using Fuzzy Logic. Using force-based strategy provides effective compliance between the tether’s anchor and the drone. The drone can thus be controlled by mere physical movement/manipulation of tether. This enhances the safety of current tethered drone systems and simplifies the flying of drones. Fuzzy Logic provides an intuitive edge to the control of such systems and allows handling noise in force sensors. Extensive simulation results are presented in this paper showing the effectiveness of the proposed control scheme.
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Carretero, J. A., and B. J. Buckham. "Simulation of Submerged Slack Tethers and Their Interaction With the Environment." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51311.

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Tethered systems, underwater or otherwise, are nowadays used for very diverse tasks. Due to the complexity of such systems, it is necessary to simulate them for design, operation and training purposes. This paper deals with an approach to simulation of tethered systems, in particular underwater remotely operated vehicles (ROVs), by incorporating contact forces acting between the tether and the environment into the dynamic model of the tether. This will ensure model fidelity when the tethered system is operated in a dense environment. In this paper, methods used to compute contact forces are described. In the calculation of contact dynamics, the distance between the tethered system and the environment is of utmost interest. Algorithms to determine the separation distance between the tether and the environment are discussed in the scope of this work. These algorithms are then incorporated into an existing dynamics model of the ROV tether. Finally, this paper concludes with a simple numerical example where a tether is moved in a concave environment. The distance between the tether and the environment is computed as the tether’s location and three-dimensional profile change with time.
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Kitagawa, Hajime, David J. Boteler, and Yung-Cheng Lee. "Thermo-Mechanical Behavior of a Micromirror for Laser-to-Fiber Active Alignment Using Bimorphs With Breakable Tethers." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15704.

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We will present a novel micromirror design in which tethered bimorph strips are used for mirror active alignment including beam steering and position fixing. A micromirror is attached to bimorphs that are pre-stressed at room temperature. A series of tethers link the bimorphs to the substrate to restrain their deformation. Breaking a tether by Joule heating allows the deformation of the bimorph to increase, changing the mirror position and orientation for precision alignment. With a large number of tethers, an optimum alignment can be achieved after breaking a selected group of tethers. We also report the experimental results of devices fabricated.
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Shao, Jin-Yu, and Baoyu Liu. "Cellular Membrane Tether Retraction: Experiment and Model." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80760.

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During leukocyte rolling on the endothelium, membrane tethers can be extracted simultaneously from both leukocytes and endothelial cells because of the force imposed by the blood flow [1]. Tether extraction has been shown to stabilize leukocyte rolling by increasing the lifetime of the adhesive selectin-ligand bonds that mediate leukocyte rolling [2]. Over the past two decades, tether extraction has been studied extensively, both experimentally and theoretically. In contrast, much less is known about tether retraction.
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Ghasemi, Amirmahdi, David J. Olinger, and Gretar Tryggvason. "Simulation of Tethered Underwater Kites: Three Dimensional Trajectories for Power Generation." In ASME 2016 Power Conference collocated with the ASME 2016 10th International Conference on Energy Sustainability and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/power2016-59141.

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In this paper, a numerical simulation of three dimensional motion of tether undersea kites (TUSK) for power generation is studied. TUSK systems consist of a rigid-winged kite, or glider, moving in an ocean current. One proposed concept uses a tethered kite which is connected by a flexible tether to a support structure with a generator on the ocean surface. The numerical simulation models the flow field in a three-dimensional domain near the rigid undersea kite wing by solving the full Navier-Stokes equations. A two-step projection method along with Open Multi-Processing (OpenMP) is employed to solve the flow equations. In order to track the rigid kite, an immersed boundary method is used. A NACA 0021 airfoil is used for the cross section shape of the kite, and the tension forces in the elastic tethers are modeled by a simple Hooke’s law. A grid refinement study has been carried out to ensure the independence of the numerical results on the grid mesh resolution. Also, the Reynolds number independency has been studied. PID control methods are used to adjust the kite pitch, roll and yaw angles during power (tether reel-out) and retraction (reel-in) phases to obtain desired kite trajectories. During the reel-out phase the kite moves in successive cross-current motions in a figure-8 pattern, the tether length increases and power is generated. During reel-in the kite motion is along the tether, and kite hydrodynamic forces are reduced so that net positive power is produced. Kite trajectories, hydrodynamic forces on the kite, kite tether tension and output power are determined and analyzed for a baseline TUSK simulation.
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Takehara, Shoichiro, Yoshiaki Terumichi, Masahiro Nohmi, Kiyoshi Sogabe, and Yoshihiro Suda. "Numerical and Experimental Approaches on the Motion of a Tethered System With Large Deformation, Rotation and Translation." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84799.

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In this paper, we discuss the motion of a tethered system. In general, a tether is a cable or wire rope, and a tethered system consists of a tether and attached equipment. A tethered subsatellite in space is an example of this system. We consider the tethered system consisting of a very flexible body (the tether) and rigid bodies at one end as our analytical model. A flexible body in planer motion is described using the Absolute Nodal Coordinate Formulation. Using this method, the motion of a flexible body with large deformation, rotation and translation can be expressed with the accuracy of rigid body motion. The combination of flexible body motion and rigid body motion is performed and the interaction between them is discussed. We also performed experiments to investigate the fundamental motion of the tethered system and to evaluate the validity of the numerical formulation. The first experiments were conducted using a steel tether and rubber tether in gravity space. We also conducted experiment of the motion of the tethered system with a rigid body in microgravity space. The numerical solutions using the proposed methods for the modeling and formulation for the tethered system are in good agreement with the experimental results.
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Casey, N. F., and R. Holmes. "Tethers 2000: Advances in Offshore Tether Technology." In Offshore Europe. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2118/23091-ms.

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Reports on the topic "Tether"

1

Forward, Robert L. Retrieve Tether Survival Probability. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada410113.

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2

Lucas, J. Tether electrical characteristics design report. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/6943711.

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Ramm, Natalie A., Bill G. Solyst, Ben C. Fisher, Reid E. Dodge, Anthony J. Pollina, and Paul G. Kuehl. Micro Gravity Balloon Drop: Tether Release. Iowa State University. Library. Digital Press, 2012. http://dx.doi.org/10.31274/ahac.8326.

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Bowen, Martin F. Loose-Tube Neutral Tether Fiber Optic Termination Procedure. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada385401.

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Costello, Mark F., and Geoffrey W. Forst. Simulation of Two Projectiles Connected by a Flexible Tether. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada382286.

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Buescher, J. G. A Fiber-Optic Tether for the Hull Search UUV System Documentation. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada450953.

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Pernicka, Henry J. Design, Fabrication and Test of a Formation of Two Satellites Connected by a Tether. Defense Technical Information Center, 2007. http://dx.doi.org/10.21236/ada471603.

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Asenath-Smith, Emily, Emily Jeng, Emma Ambrogi, Garrett Hoch, and Jason Olivier. Investigations into the ice crystallization and freezing properties of the antifreeze protein ApAFP752. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45620.

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Antifreeze proteins (AFPs) allow biological organisms, including insects, fish, and plants, to survive in freezing temperatures. While in solution, AFPs impart cryoprotection by creating a thermal hysteresis (TH), imparting ice recrystallization inhibition (IRI), and providing dynamic ice shaping (DIS). To leverage these ice-modulating effects of AFPs in other scenarios, a range of icing assays were performed with AFPs to investigate how AFPs interact with ice formation when tethered to a surface. In this work, we studied ApAFP752, an AFP from the beetle Anatolica polita, and first investigated whether removing the fusion protein attached during protein expression would result in a difference in freezing behavior. We performed optical microscopy to examine ice-crystal shape, micro-structure, and the recrystallization behavior of frozen droplets of AFP solutions. We developed a surface chemistry approach to tether these proteins to glass surfaces and conducted droplet-freezing experiments to probe the interactions of these proteins with ice formed on those surfaces. In solution, ApAFP752 did not show any DIS or TH, but it did show IRI capabilities. In surface studies, the freezing of AFP droplets on clean glass surfaces showed no dependence on concentration, and the results from freezing water droplets on AFP-decorated surfaces were inconclusive.
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Glick, Mark, Gabriel A. Lozada, Pavitra Govindan, and Darren Bush. The Horizontal Merger Efficiency Fallacy. Institute for New Economic Thinking Working Paper Series, 2023. http://dx.doi.org/10.36687/inetwp212.

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The Department of Justice and Federal Trade Commission Merger Guidelines (the “Merger Guidelines”), including the much improved latest revision in 2023 (the “New Merger Guidelines”), have continued to perpetrate what we call in this paper the horizontal merger efficiency fallacy. The fallacy arises because in the Guidelines the term “efficiencies” has become unmoored from its foundations in economic theory and has been reduced to the business school construct of cost savings. We show that cost savings can only be considered universally socially beneficial by acceptance of what is termed “the Consumer Welfare Standard” (antitrust) or “the surplus theory of welfare” (economics), a theory that has been discredited and abandoned by welfare economists. In economic theory, efficiency means Pareto Efficiency. We explore the various attempts to tether the cost savings definition of efficiency to Pareto Efficiency and explain why these attempts have failed. We conclude that there is no sound way to theoretically reconcile cost savings with the economic meaning of efficiencies. We then move beyond the efficiency fallacy and show how modern welfare economics can be used to integrate Congressional antitrust goals into the New Merger Guidelines. This requires abandoning the unsupported “standard deduction” for efficiencies and replacing it with an evidence-based assessment of how a specific merger under review potentially impacts Congressional antitrust goals. This change renders the present efficiency rebuttal section of the New Merger Guidelines superfluous, and we provide specific reasons why this section as currently drafted is flawed and should be jettisoned.
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Pearson, Jerome, Eugene Levin, Joseph A. Carroll, and John C. Oldson. Orbital Maneuvering With Spinning Electrodynamic Tethers. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada444538.

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