Academic literature on the topic 'Oscillators; Roll motion; Stability'

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Journal articles on the topic "Oscillators; Roll motion; Stability"

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TAO, YANG, ZHAOLIN FAN, JIFEI WU, and WENHUA WU. "INVESTIGATION ON STABILITY IN ROLL OF SQUARE SECTION MISSILE AT HIGH ANGLE OF ATTACK." Modern Physics Letters B 24, no. 13 (2010): 1385–88. http://dx.doi.org/10.1142/s0217984910023682.

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An experimental investigation of the stability in roll of a square section missile at high incidence was conducted in FL-23 wind tunnel. Dynamic motions were obtained on a square section missile that is free to rotate about its longitudinal axis. Different dynamic rolling motions were observed depending on the incidence of the model sting. These dynamic regimes include damped oscillations, quasi-limit-cycle wing-rock motion, and constant rolling. A coupling numerical method was established by solving the fluid dynamics equations and the rigid-body dynamics equations synchronously in order to p
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Grace, I. F., and R. A. Ibrahim. "Modelling and analysis of ship roll oscillations interacting with stationary icebergs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 10 (2008): 1873–84. http://dx.doi.org/10.1243/09544062jmes935.

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Impact dynamic interaction of ships with solid ice or stationary rigid structures is a serious problem that affects the safe operation and navigation in arctic regions. The purpose of this study is to present two analytical models of impact interaction between ship roll dynamics and one-side rigid barrier. These models are the phenomenological modelling represented by a power law in stiffness and damping forces, and Zhuravlev non-smooth coordinate transformation. Extensive numerical simulations are carried out for all initial conditions covered by the ship grazing orbit for different values of
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Krot, Alexander, Artem Ruchka, Alexander Savchenko, Olga Krot, and Dmitry Supryaga. "Analytical Modeling of Oscillations of Movable Operating Elements of a Roll-Drum Activator." International Journal of Engineering & Technology 7, no. 4.3 (2018): 58. http://dx.doi.org/10.14419/ijet.v7i4.3.19552.

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The article investigates the equipment for mechanical activation of building mixtures and the effect of the resulting oscillations on the activation efficiency and on the stability of the equipment operation. The activation of the entire building mixture with filler and wetted by finite amount of water can solve many problems that determine the quality of bricks or materials. Carried out researches of harmful oscillations of working of roll-drum activator (RDA) and their effects on the quality of processing. The own frequency of free oscillations arising in the RDA during its operation was det
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Keshmiri, Shawn S., Edward Lan, and Richard Hale. "Nonlinear aerodynamics of an unmanned aircraft in wind shear." Aircraft Engineering and Aerospace Technology 89, no. 1 (2017): 39–51. http://dx.doi.org/10.1108/aeat-11-2014-0181.

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Purpose The purpose of this paper is to evaluate the accuracy of linear and quasi-steady aerodynamic models of aircraft aerodynamic models when a small unmanned aerial system flies in the presence of strong wind and gust at a high angle of attack and a high sideslip angle. Design/methodology/approach Compatibility analysis were done to improve the quality of recorded flight test data. A robust method called fuzzy logic modeling is used to set up the aerodynamic models. The reduced frequency is used to represent the unsteadiness of the flow field according to Theodorsen’s theory. The work done
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Orszaghova, J., H. Wolgamot, S. Draper, R. Eatock Taylor, P. H. Taylor, and and A. Rafiee. "Transverse motion instability of a submerged moored buoy." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2221 (2019): 20180459. http://dx.doi.org/10.1098/rspa.2018.0459.

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Wave energy converters and other offshore structures may exhibit instability, in which one mode of motion is excited parametrically by motion in another. Here, theoretical results for the transverse motion instability (large sway oscillations perpendicular to the incident wave direction) of a submerged wave energy converter buoy are compared to an extensive experimental dataset. The device is axi-symmetric (resembling a truncated vertical cylinder) and is taut-moored via a single tether. The system is approximately a damped elastic pendulum. Assuming linear hydrodynamics, but retaining nonline
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Cao, Junjun, Junliang Cao, Zheng Zeng, and Lian Lian. "Nonlinear multiple-input-multiple-output adaptive backstepping control of underwater glider systems." International Journal of Advanced Robotic Systems 13, no. 6 (2016): 172988141666948. http://dx.doi.org/10.1177/1729881416669484.

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In this article, an adaptive backstepping control is proposed for multi-input and multi-output nonlinear underwater glider systems. The developed method is established on the basis of the state-space equations, which are simplified from the full glider dynamics through reasonable assumptions. The roll angle, pitch angle, and velocity of the vehicle are considered as control objects, a Lyapunov function consisting of the tracking error of the state vectors is established. According to Lyapunov stability theory, the adaptive control laws are derived to ensure the tracking errors asymptotically c
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Bloy, A. W., and M. Jouma'a. "Lateral and Directional Stability and Control in Air-to-Air Refuelling." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 209, no. 4 (1995): 299–305. http://dx.doi.org/10.1243/pime_proc_1995_209_304_02.

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Application of a wake roll-up method coupled with the vortex lattice method and approximate expressions for the receiver fuselage effect have been used to determine the induced loads on a Hercules receiver aircraft behind a KC10 tanker. The induced loads depend strongly on the vertical position of the receiver wing and fin relative to the tanker wing wake. In the case of steady sideslip there is a large decrease in the directional stability of the receiver as quantified by the gradient of the rudder angle versus sideslip. This is due mainly to the combined effects of the yawing moments due to
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MAHMOUD, GAMAL M., and TASSOS BOUNTIS. "THE DYNAMICS OF SYSTEMS OF COMPLEX NONLINEAR OSCILLATORS: A REVIEW." International Journal of Bifurcation and Chaos 14, no. 11 (2004): 3821–46. http://dx.doi.org/10.1142/s0218127404011624.

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Dynamical systems in the real domain are currently one of the most popular areas of scientific study. A wealth of new phenomena of bifurcations and chaos has been discovered concerning the dynamics of nonlinear systems in real phase space. There is, however, a wide variety of physical problems, which, from a mathematical point of view, can be more conveniently studied using complex variables. The main advantage of introducing complex variables is the reduction of phase space dimensions by a half. In this survey, we shall focus on such classes of autonomous, parametrically excited and modulated
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Widyantara, Dwitiya Bagus, Raden Sumiharto, and Setyawan Bekti Wibowo. "Purwarupa Sistem Kendali Kestabilan Pesawat Tanpa Awak Sayap Tetap Menggunakan Robust PID." IJEIS (Indonesian Journal of Electronics and Instrumentation Systems) 6, no. 2 (2016): 139. http://dx.doi.org/10.22146/ijeis.15260.

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This study has implemented stability control system of Unmanned Aerial Vehicle (UAV) using robust PID. The aircraft stability refers to wind against in glidding condition with straight movement. Robust PID used to control aircraft motion system. Control parameters obtained from the IMU sensor roll, pitch and yaw. IMU data are computed using DCM algorithm that produces Eulerian angles. Type PID control is determined by Ziegler-Nichols methods theory of oscillations. Control system are varied three types, there are P, PI, and PID. The results have the best type of PID control with D constant val
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El-Bassiouny, Atef F. "Nonlinear Rolling of a Biased Ship in a Regular Beam Wave under External and Parametric Excitations." Zeitschrift für Naturforschung A 62, no. 10-11 (2007): 573–86. http://dx.doi.org/10.1515/zna-2007-10-1104.

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We consider a nonlinear oscillator simultaneously excited by external and parametric functions. The oscillator has a bias parameter that breaks the symmetry of the motion. The example that we use to illustrate the problem is the rolling oscillation of a biased ship in longitudinal waves, but many mechanical systems display similar features. The analysis took into consideration linear, quadratic, cubic, quintic, and seven terms in the polynomial expansion of the relative roll angle. The damping moment consists of the linear term associated with radiation and viscous damping and a cubic term due
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Dissertations / Theses on the topic "Oscillators; Roll motion; Stability"

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Cotton, Ben. "The application of nonlinear dynamics to ship roll and capsize." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327011.

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Bacon, Adam N. "Investigation on the Impacts of Vessel Flooding on Roll Motion." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/honors_theses/127.

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This thesis develops a method to analyze the roll response of a vessel during a damaged (flooded) scenario. This was done by developing a time-domain method in which the damaged compartment was flooding while the ship is simultaneously subjected to a seaway. The KRISO containership was used as a test hull and was subjected to three flooding conditions. These flooding conditions involved flooding Hold 5, Hold 3, and Hold 1 separately. Newmark’s Beta method for linear acceleration was used to solve the roll motion of equation in which the hydrodynamic coefficients A44, B44, and C44 were predeter
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Books on the topic "Oscillators; Roll motion; Stability"

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Perez, Tristan. Ship motion control: Course keeping and roll stabilisation using rudder and fins. Springer, 2005.

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Book chapters on the topic "Oscillators; Roll motion; Stability"

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Pérez Rojas, Luis, and Jose L. Cercos Pita. "3D GPU SPH Analysis of Coupled Sloshing and Roll Motion." In Contemporary Ideas on Ship Stability. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00516-0_15.

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Falzarano, Jeffrey M., Zhiyong Su, Arada Jamnongpipatkul, and Abhilash Somayajula. "Solving the Problem of Nonlinear Ship Roll Motion Using Stochastic Dynamics." In Contemporary Ideas on Ship Stability. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00516-0_25.

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Amagai, K., K. Ueno, and N. Kimura. "Characteristics of roll motion for small fishing boats." In Contemporary Ideas on Ship Stability. Elsevier, 2000. http://dx.doi.org/10.1016/b978-008043652-4/50012-2.

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Cotton, B., J. M. T. Thompson, and K. J. Spyrou. "Some recent advances in the analysis of ship roll motion." In Contemporary Ideas on Ship Stability. Elsevier, 2000. http://dx.doi.org/10.1016/b978-008043652-4/50009-2.

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Murashige, Sunao, Motomasa Komuro, Kazuyuki Aihara, and Taiji Yamada. "Nonlinear roll motion and bifurcation of a RO-RO ship with flooded water in regular beam waves." In Contemporary Ideas on Ship Stability. Elsevier, 2000. http://dx.doi.org/10.1016/b978-008043652-4/50032-8.

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Conference papers on the topic "Oscillators; Roll motion; Stability"

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Montazeri, N., S. H. Mousavizadegan, and F. Bakhtiarinejad. "The Effectiveness of Moving Masses in Reducing the Roll Motion of Floating Vessels." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38574.

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Dynamic motions of Ships in severe conditions of sea may be undesired and should be controlled by some devices. The roll motion is much more significant than the other oscillations which can affect comfort, safety and efficiency of navigation at sea. This motion is controlled by some common stabilizers such as rudder, fins, etc. They may be divided into two categories of passive and active stabilizers or controllers. However controlling devices may be high in cost. Moving masses are employed to reduce the motions of floating vessels or offshore structures. This type of stabilizers consists of
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Haslum, Herbjørn, Mathias Marley, Bjørn Skaare, and Håkon Andersen. "Aerodynamic Roll-Yaw Instabilities of Floating Offshore Wind Turbines." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18273.

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Abstract This paper presents an investigation of a newly discovered motion instability phenomenon for floating wind turbines. The instability is due to anti-symmetric coupling terms in roll and yaw caused by the turbine thrust force. For floaters with small separation between the uncoupled roll and yaw natural periods these coupling forces may result in rigid body roll and yaw oscillations. The paper explains the theory and the physics of the instability phenomenon, and analytical expressions for these stiffness coupling terms (K46 and K64) are derived. The instability phenomenon is demonstrat
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Dostal, Leo, and Edwin Kreuzer. "Assessment of Extreme Rolling of Ships in Random Seas." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23458.

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The goal of our analysis is to improve intact stability criteria for ships. For this, we develop analytical formulas for mean first passage times of critical roll amplitudes of ships travelling in long crested random seas with an arbitrary wave encounter angle. Starting from a model for coupled heave-pitch-roll motion, we average the fast oscillatory dynamics of roll over the roll period, which yields equations for drift and diffusion of roll energy. The results are used to calculate the desired mean first passage times. Finally, we apply the proposed theory to a sample ship design.
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Bassler, Christopher C., Jason B. Carneal, and Paisan Atsavapranee. "Experimental Investigation of Hydrodynamic Coefficients of a Wave-Piercing Tumblehome Hull Form." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29310.

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A systematic series of calm-water forced roll model tests were performed over a range of forward speeds using an advanced tumblehome hull form (DTMB model #5613-1) to examine the mechanisms of roll damping. This experimental investigation is part of an ongoing effort to advance the capability to assess seakeeping, maneuvering, and dynamic stability characteristics of an advanced surface combatant. The experiment was performed to provide data for development and validation of a semi-empirical roll damping model for use in validation of ship motion and viscous flow simulation codes, as well as t
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Lorkowski, Oliver, Hendrik Dankowski, and Florian Kluwe. "An Experimental Study on Progressive and Dynamic Damage Stability Scenarios." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23388.

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Current damage stability rules for ships are based on the evaluation of a ship’s residual stability in the final flooding stage. The consideration of the dynamic propagation of water within the inner subdivision as well as intermediate flooding stages and their influence on the resulting stability is very limited in the current damage stability regulations. The investigation of accidents like the one of the Estonia or the European Gateway reveals that intermediate stages of flooding and the dynamic flooding sequence result in significant fluid shifting moments which have a major influence on t
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Francescutto, Alberto, and Antonio Cardo. "Dynamic Stability and Roll Motion of Multihulls." In FAST 2001. RINA, 2001. http://dx.doi.org/10.3940/rina.ft.2001.34.

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Jung, Jongchul, Taehyun Shim, and Jamie Gertsch. "Roll Stability Indicator Incorporating Roll Center Movement." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43506.

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Predicting impending vehicle rollover is essential for rollover prevention systems but it is not a simple task. In describing roll motion, the roll center movement becomes important as the vehicle roll angle increases, and thus affects the performance of rollover warning devices. This paper proposes a dynamic roll stability indicator incorporating roll center movement. A robust parameter identification algorithm is designed to estimate the horizontal and vertical movement of the roll center. This estimate is used in the roll stability indicator to update its rollover threshold value. The effec
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Chokor, Abbas, Reine Talj, Moustapha Doumiati, and Ali Charara. "Effect of Roll Motion Control on Vehicle Lateral Stability and Rollover Avoidance*." In 2020 American Control Conference (ACC). IEEE, 2020. http://dx.doi.org/10.23919/acc45564.2020.9147735.

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Santiago Caamaño, Lucía, Marcos Míguez González, and Vicente Díaz Casás. "Improving the Safety of Fishing Vessels Through Roll Motion Analysis." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78572.

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Fishing sector is one of the most dangerous worldwide. Accidents are usually related to stability failures that can be due to static or dynamic phenomena. Their main cause is the crew lack of training in stability matters, especially in small-medium sized fishing vessels. The vast majority of fishermen assess the risk level of their ship carrying out a subjective analysis, based on their previous experience. In order to reduce the number of stability-related accidents, onboard guidance systems were proposed in the last years as a tool that helps the skippers to evaluate the ship stability in a
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Adireddy, Ganesh, and Taehyun Shim. "MPC Based Integrated Chassis Control to Enhance Vehicle Handling Considering Roll Stability." In ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control. ASMEDC, 2011. http://dx.doi.org/10.1115/dscc2011-6159.

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An integrated vehicle chassis control system was developed to improve vehicle handling (yaw) responses while maintain vehicle roll stability using an 8 DOF vehicle model, a simplified tire model, and a model predictive control method. The proposed control system incorporates active wheel torque distribution, active front steering, and active anti-rollbar to enhance vehicle handling and its ability to track the desired trajectory when the risk of vehicle rollover is low. As vehicle rollover risks increase, the proposed control system shifts its control focus from only handling enhancement to ve
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