Log in

Relevant bibliographies by topics / Oscillators; Roll motion; Stability / Journal articles

To see the other types of publications on this topic, follow the link: Oscillators; Roll motion; Stability.

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

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Oscillators; Roll motion; Stability.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

3

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

4

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

5

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

6

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

7

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

8

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

9

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

10

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

11

Rakhmanov, S. R. "Some peculiarities of the process of the pipe purse firmware on the firmware." Metallurgicheskaya i gornorudnaya promyshlennost, no. 1 (2019): 31–39. http://dx.doi.org/10.33101/s001-1700087840.

Full text

Abstract:

Purpose. Conducting research aimed at choosing the rational modes of flashing the tubular billet by stabilizing the dynamic characteristics of the drive power line of heavy-duty piercing mills TPA. Methodology. The dynamics of the power line of the piercing mill of the pipe-rolling unit (TPA) are considered, taking into account the peculiarities of the behavior of the spindle hinges and the mechanism for setting the work rolls. Findings. The differential equation of motion of the line of the main drive of the piercing mill is composed and its numerical solution is given. An adapted three-mass

APA, Harvard, Vancouver, ISO, and other styles

12

Maslov, V. "Research of freak wave effect on a floating object in seakeeping tank." Transactions of the Krylov State Research Centre 3, no. 397 (2021): 65–74. http://dx.doi.org/10.24937/2542-2324-2021-3-397-65-74.

Full text

Abstract:

Object and purpose of research. This paper describes physical modeling of interaction process of abnormal wave (freak wave) with a marine floating structure in a seakeeping tank of the Krylov State Research Center. Freak wave is extremely dangerous because of the difference from wind waves by an unusually steep front slope and a gentle trough. Freak wave appears suddenly and collapses rapidly. Research of effect process features is necessary for understanding and analysis of the object behavior at extreme sea conditions. As experiment results it was necessary to obtain empirical data of sea ob

APA, Harvard, Vancouver, ISO, and other styles

13

Davidson, Josh, and Tamás Kalmár-Nagy. "A Real-Time Detection System for the Onset of Parametric Resonance in Wave Energy Converters." Journal of Marine Science and Engineering 8, no. 10 (2020): 819. http://dx.doi.org/10.3390/jmse8100819.

Full text

Abstract:

Parametric resonance is a dynamic instability due to the internal transfer of energy between degrees of freedom. Parametric resonance is known to cause large unstable pitch and/or roll motions in floating bodies, and has been observed in wave energy converters (WECs). The occurrence of parametric resonance can be highly detrimental to the performance of a WEC, since the energy in the primary mode of motion is parasitically transferred into other modes, reducing the available energy for conversion. In addition, the large unstable oscillations produce increased loading on the WEC structure and m

APA, Harvard, Vancouver, ISO, and other styles

14

Wu, Xuesong, and Xiuling Zhuang. "Nonlinear dynamics of large-scale coherent structures in turbulent free shear layers." Journal of Fluid Mechanics 787 (December 16, 2015): 396–439. http://dx.doi.org/10.1017/jfm.2015.646.

Full text

Abstract:

Fully developed turbulent free shear layers exhibit a high degree of order, characterized by large-scale coherent structures in the form of spanwise vortex rollers. Extensive experimental investigations show that such organized motions bear remarkable resemblance to instability waves, and their main characteristics, including the length scales, propagation speeds and transverse structures, are reasonably well predicted by linear stability analysis of the mean flow. In this paper, we present a mathematical theory to describe the nonlinear dynamics of coherent structures. The formulation is base

APA, Harvard, Vancouver, ISO, and other styles

15

Dao, Nguyen Van. "Nonlinear model simulation of ship motion." Vietnam Journal of Mechanics 14, no. 2 (1992): 7–12. http://dx.doi.org/10.15625/0866-7136/10227.

Full text

Abstract:

Nonlinear model simulation of coupling between heave-roll and pitch roll ship motions is considered by means of the asymptotic method of nonlinear mechanics. The purely vertical motion and vertical-angular motion and their stability are studied.

APA, Harvard, Vancouver, ISO, and other styles

16

Geng, Yi Xiang, and Han Ze Liu. "Stability of Subharmonic Oscillations in a Pipe Conveying Fluid under Harmonic Excitation." Applied Mechanics and Materials 444-445 (October 2013): 796–800. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.796.

Full text

Abstract:

The existence and stability of subharmonic oscillations in a two end-fixed fluid conveying pipe whose base is subjected to a harmonic excitation are investigated. A Galerkin approach is utilized to reduce the equation of motion to a second order nonlinear differential equation. The conditions for the existence of subharmonic oscillations are given by using Melnikov method. The stability of subharmonic oscillations is discussed in detail by using action-angle variable and averaging method. It is shown that the velocity of fluid plays an important role in the stability of subharmonic oscillation

APA, Harvard, Vancouver, ISO, and other styles

17

Natsiavas, S. "Stability and bifurcation analysis for oscillators with motion limiting constraints." Journal of Sound and Vibration 141, no. 1 (1990): 97–102. http://dx.doi.org/10.1016/0022-460x(90)90515-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Takano, Shuichi, and Masao Nagai. "3205 Study of Roll Motion and Stability of Heavy Vehicles." Proceedings of the Transportation and Logistics Conference 2000.9 (2000): 193–96. http://dx.doi.org/10.1299/jsmetld.2000.9.193.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Iglesias Baniela, Santiago. "Roll Motion of a Ship and the Roll Stabilising Effect of Bilge Keels." Journal of Navigation 61, no. 4 (2008): 667–86. http://dx.doi.org/10.1017/s0373463308004931.

Full text

Abstract:

The roll motion of a ship on waves is one of the six degrees of freedom and is the most difficult to predict since it deals with a motion similar to a spring-mass damper system, poorly damped by ship generated waves, in addition to the action of waves from the high seas. This problem increased from the second half of the 19th century when sailing propulsion was replaced by steam machines and iron replaced wood, which led to design modifications in ships affecting transversal stability, with the result of an increment in the ship's roll motion. As a consequence, it has been necessary to develop

APA, Harvard, Vancouver, ISO, and other styles

20

Hu, Yong, and David B. Bogy. "Dynamic Stability and Spacing Modulation of Sub-25 nm Fly Height Sliders." Journal of Tribology 119, no. 4 (1997): 646–52. http://dx.doi.org/10.1115/1.2833864.

Full text

Abstract:

Designing a reliable sub-25 nm spacing head/disk interface for today’s magnetic hard disk drives demands a greater dynamic stability and a smaller spacing modulation. An air bearing dynamic simulator with multiple features is developed to investigate the dynamic characteristics of three shaped-rail negative pressure sub-25 nm fly height sliders. Various simulations including air bearing stiffness, impulse response, surface roughness induced spacing modulation, bump response, and track seeking dynamics are performed. The results indicate that the roughness induced spacing modulation decreases w

APA, Harvard, Vancouver, ISO, and other styles

21

Bulian, Gabriele, Alberto Francescutto, and Igor Zotti. "Stability and roll motion of fast multihull vessels in beam waves." Ships and Offshore Structures 3, no. 3 (2008): 215–28. http://dx.doi.org/10.1080/17445300801990913.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Yim, Solomon C. S., Tongchate Nakhata, and Erick T. Huang. "Coupled Nonlinear Barge Motions, Part II: Stochastic Models and Stability Analysis." Journal of Offshore Mechanics and Arctic Engineering 127, no. 2 (2005): 83–95. http://dx.doi.org/10.1115/1.1884617.

Full text

Abstract:

A computationally efficient quasi-two-degree-of-freedom (Q2DOF) stochastic model and a stability analysis of barges in random seas are presented in this paper. Based on the deterministic 2DOF coupled roll-heave model with high-degree polynomial approximation of restoring forces and moments developed in Part I, an attempt is made to further reduce the DOF of the model for efficient stochastic stability analysis by decoupling the heave effects on roll motion, resulting in a one-degree-of-freedom (1DOF) roll-only model. Using the Markov assumption, stochastic differential equations governing the

APA, Harvard, Vancouver, ISO, and other styles

23

Yim, Solomon C. S., Tongchate Nakhata, Warren A. Bartel, and Erick T. Huang. "Coupled Nonlinear Barge Motions, Part I: Deterministic Models Development, Identification and Calibration." Journal of Offshore Mechanics and Arctic Engineering 127, no. 1 (2005): 1–10. http://dx.doi.org/10.1115/1.1854700.

Full text

Abstract:

This paper focuses on the development of optimal deterministic, nonlinearly coupled barge motion models, identification of their system parameters, and calibration of their prediction capability using experimental results. The ultimate objective is to develop accurate yet sufficiently low degree-of-freedom stochastic models suitable for efficient probabilistic stability and reliability analyses of US Naval barges for preliminary design and operation guideline development (see Part II). First a three-degree-of-freedom (3DOF) fully coupled roll-heave-sway model, which features realistic and prac

APA, Harvard, Vancouver, ISO, and other styles

24

Ibrahim, R. A., and I. M. Grace. "Modeling of Ship Roll Dynamics and Its Coupling with Heave and Pitch." Mathematical Problems in Engineering 2010 (2010): 1–32. http://dx.doi.org/10.1155/2010/934714.

Full text

Abstract:

In order to study the dynamic behavior of ships navigating in severe environmental conditions it is imperative to develop their governing equations of motion taking into account the inherent nonlinearity of large-amplitude ship motion. The purpose of this paper is to present the coupled nonlinear equations of motion in heave, roll, and pitch based on physical grounds. The ingredients of the formulation are comprised of three main components. These are the inertia forces and moments, restoring forces and moments, and damping forces and moments with an emphasis to the roll damping moment. In the

APA, Harvard, Vancouver, ISO, and other styles

25

Haro, Marco Polo Espinoza, Jong-Chun Park, Dong-Hyun Kim, and Sung-Bum Lee. "CFD Simulation on Workability of a Seaweed Harvesting Boat Due to Wake-Wash." Journal of Marine Science and Engineering 8, no. 8 (2020): 544. http://dx.doi.org/10.3390/jmse8080544.

Full text

Abstract:

In the present study, a 2-ton class seaweed harvesting boat was optimized by employing a W-shape hull form to reduce roll motion due to wake-wash from passing boats. A series of numerical simulations were conducted using Star-CCM+, a commercial CFD (computational fluid dynamics) software, to improve workability by optimizing the hull form from the conventional design (original hull form). The 2-dimensional roll decay motion of various hull forms with W-shape midsection were simulated and the hull form with the best performance in free roll decay test was selected. To evaluate stability of each

APA, Harvard, Vancouver, ISO, and other styles

26

Alarçin, Fuat, Hakan Demirel, M. Ertugrul Su, and Ahmet Yurtseven. "Modified pid control design for roll fin actuator of nonlinear modelling of the fishing boat." Polish Maritime Research 21, no. 1 (2013): 3–8. http://dx.doi.org/10.2478/pomr-2014-0001.

Full text

Abstract:

ABSTRACT This study aims to reduce roll motion of a fishing boat which arises from disturbing hydrodynamic effects by means of fin roll stabilizer. It is assured that roll motion with nonlinear damping and restoring moment coefficients are down to the desired level through classical PID and modified PID algorithms. At the time of sailing, stability, a very important concept, was examined using Lyapunov direct method taking initial conditions into consideration, and it was noted that the system was generally stable. In addition, NACA 0015 model was used for the fin roll stabilizer, and flow ana

APA, Harvard, Vancouver, ISO, and other styles

27

Akhmet, Marat, Madina Tleubergenova, and Akylbek Zhamanshin. "Inertial Neural Networks with Unpredictable Oscillations." Mathematics 8, no. 10 (2020): 1797. http://dx.doi.org/10.3390/math8101797.

Full text

Abstract:

In this paper, inertial neural networks are under investigation, that is, the second order differential equations. The recently introduced new type of motions, unpredictable oscillations, are considered for the models. The motions continue a line of periodic and almost periodic oscillations. The research is of very strong importance for neuroscience, since the existence of unpredictable solutions proves Poincaré chaos. Sufficient conditions have been determined for the existence, uniqueness, and exponential stability of unpredictable solutions. The results can significantly extend the role of

APA, Harvard, Vancouver, ISO, and other styles

28

Ajel, Ahmed R., Amjad J. Humaidi, Ibraheem Kasim Ibraheem, and Ahmad Taher Azar. "Robust Model Reference Adaptive Control for Tail-Sitter VTOL Aircraft." Actuators 10, no. 7 (2021): 162. http://dx.doi.org/10.3390/act10070162.

Full text

Abstract:

This study presents a control design of roll motion for a vertical take-off and landing unmanned air vehicle (VTOL-UAV) design based on the Model Reference Adaptive Control (MRAC) scheme in the hovering flight phase. The adaptive laws are developed for the UAV system under nonparametric uncertainty (gust and wind disturbance). Lyapunov-based stability analysis of the adaptive controlled UAV system under roll motion has been conducted and the adaptive laws have been accordingly developed. The Uniform Ultimate Boundness (UUB) of tracking error has been proven and the stability analysis showed th

APA, Harvard, Vancouver, ISO, and other styles

29

Santos Neves, M. A., N. Pérez, and O. Lorca. "Analysis of roll motion and stability of a fishing vessel in head seas." Ocean Engineering 30, no. 7 (2003): 921–35. http://dx.doi.org/10.1016/s0029-8018(02)00066-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Burov, A., and I. Kosenko. "On planar oscillations of a body with a variable mass distribution in an elliptic orbit." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 10 (2011): 2288–95. http://dx.doi.org/10.1177/0954406211404327.

Full text

Abstract:

Planar motion of an orbiting body having a variable mass distribution in a central field of gravity is under analysis. Within the so-called ‘satellite approximation’ planar attitude dynamics is reduced to the 3/2-degrees of freedom description by one ODE of second order. The law of the mass distribution variations implying an existence of the special relative equilibria, such that the body is oriented pointing to the attracting centre by the same axis for any value of the orbit eccentricity is indicated. For particular example of an orbiting dumb-bell equipped by a massive cabin, wandering bet

APA, Harvard, Vancouver, ISO, and other styles

31

Nayfeh, All H. "On the Undesirable Roll Characteristics of Ships in Regular Seas." Journal of Ship Research 32, no. 02 (1988): 92–100. http://dx.doi.org/10.5957/jsr.1988.32.2.92.

Full text

Abstract:

In 1863 Froude observed that a ship whose frequency in pitch (heave) is twice its frequency in roll has undesirable roll characteristics. To explain this phenomenon, Paulling and Rosenberg as well as Kinney assumed the pitch (heave) motion to be a simple harmonic independent of the roll motion. Substituting the pitch (heave) expression into the roll equation, they obtained a Mathieu equation. They found that exponentially growing instabilities can occur for certain pitch amplitudes and frequency ratios. The exponential growth is unrealistic, the result of their neglecting the influence of the

APA, Harvard, Vancouver, ISO, and other styles

32

Liu, P. J., S. Rakheja, and A. K. W. Ahmed. "PROPERTIES OF AN INTERCONNECTED HYDRO-PNEUMATIC SUSPENSION SYSTEM." Transactions of the Canadian Society for Mechanical Engineering 19, no. 4 (1995): 383–96. http://dx.doi.org/10.1139/tcsme-1995-0020.

Full text

Abstract:

The static and dynamic properties of a vehicle suspension comprising hydraulic struts interconnected in the roll plane are investigated. The fundamental properties of the interconnected suspension are investigated and compared to those of the unconnected suspensions with and without the anti-roll bar, in terms of load-carrying capacity, suspension rate, roll stiffness as well as damping characteristics. The anti-roll performance of the interconnected suspension is analyzed for excitations encountered during directional manoeuvres. The ride quality performance is evaluated for excitations occur

APA, Harvard, Vancouver, ISO, and other styles

33

Amin, Khunsa, Jinzi Mac Huang, Kevin J. Hu, Jun Zhang, and Leif Ristroph. "The role of shape-dependent flight stability in the origin of oriented meteorites." Proceedings of the National Academy of Sciences 116, no. 33 (2019): 16180–85. http://dx.doi.org/10.1073/pnas.1815133116.

Full text

Abstract:

The atmospheric ablation of meteoroids is a striking example of the reshaping of a solid object due to its motion through a fluid. Motivated by meteorite samples collected on Earth that suggest fixed orientation during flight—most notably the conical shape of so-called oriented meteorites—we hypothesize that such forms result from an aerodynamic stabilization of posture that may be achieved only by specific shapes. Here, we investigate this issue of flight stability in the parallel context of fluid mechanical erosion of clay bodies in flowing water, which yields shapes resembling oriented mete

APA, Harvard, Vancouver, ISO, and other styles

34

Hasanudin, Jeng Horng Chen, I. Ketut Aria Pria Utama, and Haris Hendratmoko. "An Investigation into the Effect of Bilge Keels to the Roll Motion Response of Fishing Vessel." Applied Mechanics and Materials 862 (January 2017): 284–90. http://dx.doi.org/10.4028/www.scientific.net/amm.862.284.

Full text

Abstract:

Stability of a ship is very influenced by ship’s roll motion, which is able to cause the ship to capsize. One of the main component which influence the roll motion, is the usage of motion damper at the ship’s hull. Bilge keel is a kind of passive damper whose construction is easy and does not require special system in the operation. The suitable bilge keel size is able to reduce excessive ship motion response when experiencing excitation force. This paper investigates the influence of bilge keel to the motion response of the ship by using a fishing vessel model with round bilge. The study was

APA, Harvard, Vancouver, ISO, and other styles

35

PARCZEWSKI, Krzysztof, and Henryk WNĘK. "The influence of vehicle body roll angle on the motion stability and maneuverability of the vehicle." Combustion Engines 168, no. 1 (2017): 133–39. http://dx.doi.org/10.19206/ce-2017-121.

Full text

Abstract:

The article discusses the impact of design solutions of vehicle suspensions into angles of body roll. It was shown which type of suspensions is better from this point of view. There were examined the dependence of the suspensions parameters on the vehicle body roll angle. The influence of camber angle on the force transmitted to the tire contact with the road surface was analysed. The lateral forces were measured on the test stand. There was tested dependency of lateral forces from the sideslip angle for different angles of camber. Was analysed change of lateral forces generated by camber angl

APA, Harvard, Vancouver, ISO, and other styles

36

Liang, Bin, and Mao Sun. "Nonlinear flight dynamics and stability of hovering model insects." Journal of The Royal Society Interface 10, no. 85 (2013): 20130269. http://dx.doi.org/10.1098/rsif.2013.0269.

Full text

Abstract:

Current analyses on insect dynamic flight stability are based on linear theory and limited to small disturbance motions. However, insects' aerial environment is filled with swirling eddies and wind gusts, and large disturbances are common. Here, we numerically solve the equations of motion coupled with the Navier–Stokes equations to simulate the large disturbance motions and analyse the nonlinear flight dynamics of hovering model insects. We consider two representative model insects, a model hawkmoth (large size, low wingbeat frequency) and a model dronefly (small size, high wingbeat frequency

APA, Harvard, Vancouver, ISO, and other styles

37

Rahimi, Shahab, and Mahyar Naraghi. "Design of an integrated control system to enhance vehicle roll and lateral dynamics." Transactions of the Institute of Measurement and Control 40, no. 5 (2017): 1435–46. http://dx.doi.org/10.1177/0142331216685389.

Full text

Abstract:

Besides lateral instability, one major threat to all ground vehicles, especially SUVs, is the danger of rollover during cornering. A coordination strategy based on fuzzy logic has been devised to coordinate the sub-controls; namely, active steering, active differential, active brake and a novel active roll control system. Independent study of each sub-control as well as an analysis of their inter-relationship has been carried out. The coordination strategy is supposed to resolve the conflict among control targets – which are sideslip regulation, yaw rate tracking, lateral acceleration tracking

APA, Harvard, Vancouver, ISO, and other styles

38

Shamikh, Abdul Jabbar Jwair. "Effect of Enlarging the Aircraft Vertical Tail on State Variables of Stability Response during Dynamic Coupling." Wasit Journal of Engineering Sciences 1, no. 2 (2013): 32–43. http://dx.doi.org/10.31185/ejuow.vol1.iss2.10.

Full text

Abstract:

In this paper the variables of high performance aircraft including the modification of vertical tail during the roll inertia cross coupling phenomenon is presented. To demonstrate the effects of the enlarging the area of vertical tail on stability of aircraft, the longitudinal-lateral equations of aircraft motion at steady roll rate are solved. The results indicate that damping of the modified system is increased and the longitudinal-lateral state variables response of the aircraft is improved. The increase in the area of the vertical fin is a necessary feature in the development of the aircra

APA, Harvard, Vancouver, ISO, and other styles

39

BLENNERHASSETT, P. J., and ANDREW P. BASSOM. "The linear stability of high-frequency flow in a torsionally oscillating cylinder." Journal of Fluid Mechanics 576 (March 28, 2007): 491–505. http://dx.doi.org/10.1017/s0022112007004831.

Full text

Abstract:

The linear stability of the Stokes layer induced in a fluid contained within a long cylinder oscillating at high frequency about its longitudinal axis is investigated. The disturbance equations are derived using Floquet theory and the resulting system solved using pseudo-spectral methods. Both shear modes and axially periodic centripetal disturbance modes are examined and neutral stability curves and corresponding critical conditions for instability identified. For sufficiently small cylinder radius it is verified that the centripetal perturbations limit the stability of the motion but that in

APA, Harvard, Vancouver, ISO, and other styles

40

Luo, A. C. J., and D. O'Connor. "Impacting chatter and stick in a transmission system with two oscillators." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 223, no. 3 (2009): 159–88. http://dx.doi.org/10.1243/14644193jmbd202.

Full text

Abstract:

In this article, an investigation on non-linear dynamical behaviours of a transmission system with a gear pair is conducted. The transmission system is described through an impact model with a possible stick between the two gears. From the theory of discontinuous dynamical systems, the motion mechanism of impacting chatter with stick is investigated. The onset and vanishing conditions for stick motions are developed, and the condition for maintaining stick motion is obtained as well. The corresponding physical interpretation is given for a better understanding of non-linear behaviours of gear

APA, Harvard, Vancouver, ISO, and other styles

41

YOSHIKAWA, HARUNORI N., and JOSÉ EDUARDO WESFREID. "Oscillatory Kelvin–Helmholtz instability. Part 2. An experiment in fluids with a large viscosity contrast." Journal of Fluid Mechanics 675 (March 23, 2011): 249–67. http://dx.doi.org/10.1017/s0022112011000152.

Full text

Abstract:

The stability of two-layer oscillatory flows was studied experimentally in a cylindrical container with a vertical axis. Two superposed immiscible liquids, differing greatly in viscosity, were set in relative oscillatory motion by alternating container rotation. Waves arising beyond a threshold were observed in detail for small oscillation frequencies ranging from 0.1 to 6 Hz. Measurements were performed on the growth rate and the wavenumber of these waves. The instability threshold was determined from the growth rate data. It was found that the threshold and the wavenumber varied with the fre

APA, Harvard, Vancouver, ISO, and other styles

42

Gaspersz, Fella, and Richard B. Luhulima. "ANALISA TITIK KRITIS GERAKAN ROLL KAPAL TRIMARAN UNTUK DIAPLIKASI PADA KAPAL IKAN PURSE SEINE." ALE Proceeding 4 (August 17, 2021): 44–50. http://dx.doi.org/10.30598/ale.4.2021.44-50.

Full text

Abstract:

The marine fisheries catching and processing industry are considered vulnerable to the effects of extreme weather at sea. Global warming effects and El Nino and La Nina have a significant impact on the upwelling process, which impacts the lifestyle and environment of marine biota, including pelagic fish, which is one of the most important contributors to the shipping industry. Extreme weather conditions, with wave heights ranging from 1 to 5 meters, dominate the waters of Maluku. In extreme sea conditions, most fishers choose not to go fishing, not because there are no fish at the fishing grou

APA, Harvard, Vancouver, ISO, and other styles

43

ASTON, PHILIP J., and MICHAEL DELLNITZ. "SYMMETRY BREAKING BIFURCATIONS OF CHAOTIC ATTRACTORS." International Journal of Bifurcation and Chaos 05, no. 06 (1995): 1643–76. http://dx.doi.org/10.1142/s021812749500123x.

Full text

Abstract:

In an array of coupled oscillators, synchronous chaos may occur in the sense that all the oscillators behave identically although the corresponding motion is chaotic. When a parameter is varied this fully symmetric dynamical state can lose its stability, and the main purpose of this paper is to investigate which type of dynamical behavior is expected to be observed once the loss of stability has occurred. The essential tool is a classification of Lyapunov exponents based on the symmetry of the underlying problem. This classification is crucial in the derivation of the analytical results but it

APA, Harvard, Vancouver, ISO, and other styles

44

PECORA, LOU, TOM CARROLL, GREGG JOHNSON, DOUG MAR, and KENNETH S. FINK. "SYNCHRONIZATION STABILITY IN COUPLED OSCILLATOR ARRAYS: SOLUTION FOR ARBITRARY CONFIGURATIONS." International Journal of Bifurcation and Chaos 10, no. 02 (2000): 273–90. http://dx.doi.org/10.1142/s0218127400000189.

Full text

Abstract:

The stability of the state of motion in which a collection of coupled oscillators are in identical synchrony is often a primary and crucial issue. When synchronization stability is needed for many different configurations of the oscillators the problem can become computationally intense. In addition, there is often no general guidance on how to change a configuration to enhance or diminsh stability, depending on the requirements. We have recently introduced a concept called the Master Stability Function that is designed to accomplish two goals: (1) decrease the numerical load in calculating sy

APA, Harvard, Vancouver, ISO, and other styles

45

Yao, Qi Guo, and Yu Liang Liu. "Simulation and Analysis of Dynamic Characteristics of Rolling Motion of Rotational Molding Ship." Applied Mechanics and Materials 556-562 (May 2014): 1278–81. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1278.

Full text

Abstract:

Parametric resonance can lead to roll motions and endanger the ship, cargo and crew. The QR-factorization method for calculating lyapunov characteristic exponents (LCEs) was introduced. And then, parametric resonance stability of ships in longitudinal waves was analyzed by taking the fishing-entertainment rotational molding boat as an example. Simulation results show that, this method can be used to analyze ship stability and to accurately identify safe and unsafe operating conditions for a ship in longitudinal waves.

APA, Harvard, Vancouver, ISO, and other styles

46

Richards, Jason T., Ajitkumar P. Mulavara, and Jacob J. Bloomberg. "Postural Stability During Treadmill Locomotion as a Function of the Visual Polarity and Rotation of a Three-Dimensional Virtual Environment." Presence: Teleoperators and Virtual Environments 13, no. 3 (2004): 371–84. http://dx.doi.org/10.1162/1054746041422299.

Full text

Abstract:

Visual inputs provide us with important cues for orientation and self-movement perception during locomotion. The purpose of the present study was to better understand and quantify the effects of visual scene variables: visual polarity and visual scene rotation on postural stability during treadmill locomotion. During 60 s trials, subjects walked at 4.0 km/h while viewing a monoscopic, passive-immersive, 3D virtual room environment that contained either polarized or nonpolarized content and was back-projected onto a screen 1.5 m in front of them, one at a time. Scenes remained static for the fi

APA, Harvard, Vancouver, ISO, and other styles

47

Zhao, Jiangbo, Xiaodong Sun, Liang Zhao, and Junzheng Wang. "Robust backstepping control of double-rod cylinder for motion synchronization of mold oscillator." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 232, no. 1 (2017): 29–38. http://dx.doi.org/10.1177/0959651817733588.

Full text

Abstract:

High-performance synchronization control of two double-rod cylinders used to oscillate the mold of a continuous casting machine is considered in this article. Friction between strand shell and mold plays an important role to achieve high-precision control of mold oscillator. A new friction model is proposed for exact system modeling and is proved useful. Using a force-distribution method to consider the coupling effect between two cylinders, mathematical models of each cylinder are presented and a simple robust backstepping control strategy is proposed, which can reduce the influences of time-

APA, Harvard, Vancouver, ISO, and other styles

48

Romanova, Irina. "Simulation of Motion Stability of Deformed Elongated Bodies Based on Variations of Angular Velocities in Roll." SPIIRAS Proceedings 18, no. 3 (2019): 646–77. http://dx.doi.org/10.15622/sp.2019.18.3.645-676.

Full text

Abstract:

The class of moving objects, which are bodies of revolution, which for some reason have undergone irreversible deformations of the hull, is considered. The immediacy of the problem being studied has to do both with the need to study the dynamics of such objects and the insufficiency of the studies already conducted, which are mainly focused on the study of the effects of aeroelasticity or mass asymmetry and do not affect the dynamics of bodies with irreversible deformations. The problem of the motion stability of the considered objects, including the process of interaction of the l

APA, Harvard, Vancouver, ISO, and other styles

49

Graham, W. R. "Asymptotic analysis of the classical aircraft stability equations." Aeronautical Journal 103, no. 1020 (1999): 95–103. http://dx.doi.org/10.1017/s0001924000027792.

Full text

Abstract:

Abstract A new approach to deriving analytical approximations for the free modes of motion of an aircraft is presented. Based on an asymptotic analysis, it eliminates the need for a priori assumptions regarding the characteristic motion of each mode, and is thus particularly suitable for an introductory exposition. In its basic form, it yields expressions for natural frequencies, damping factors and time constants which agree, to leading order, with well established results. At a more advanced level, it allows us to assess the validity of these results. In particular, we find that the two degr

APA, Harvard, Vancouver, ISO, and other styles

50

Kuo, Chung-Feng Jeffrey, and Huy Quang Vu. "Active damping vibration and compensating deflection in the processing-roll system." Textile Research Journal 81, no. 20 (2011): 2125–38. http://dx.doi.org/10.1177/0040517511414975.

Full text

Abstract:

Deflection and vibration, normally occurring in the processing-roll system, have always been large drawbacks of many industrial processes, especially those related to the textile industry. Hence, this paper introduced a new control dynamic system, including an oil-roll actuator and a proposed controller, to suppress vibration and compensate deflection. The oil-roll actuator applies the control force to the roll by putting the oil inside the roll and directly transferring pressure from the oil to the internal surface of the roll. A new forced-response motion equation obtained by analyzing the d

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!