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Thursday, July 30, 2020 | History

1 edition of Sway, yaw, and roll coupling effects on straight line stability of submersibles found in the catalog.

Sway, yaw, and roll coupling effects on straight line stability of submersibles

Daniel J. Cunningham

Sway, yaw, and roll coupling effects on straight line stability of submersibles

by Daniel J. Cunningham

  • 210 Want to read
  • 15 Currently reading

Published by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

Statementby Daniel J. Cunningham II
ContributionsPapoulias, Fotis A.
The Physical Object
Pagination75 p. ;
Number of Pages75
ID Numbers
Open LibraryOL25498042M

The paper deals with the prediction of coupled sway-roll-yaw motions of a ship with constant forward speed, subject to regular wave force. The governing equations derived in time domain after balancing the hydrodynamic and exciting forces are solved analytically while considering the motion variables, wave frequency and external force are. From my limited understanding the effect of a sway bar that was too stiff would be one of the following, either: The left strut would expand into the pothole, exerting downward force on the wheel. Via the sway bar, some of this would also be transferred to the right side, exerting an .

2. Mathematical model. A MMG type ship maneuvering mathematical model for predicting the hydrodynamic forces and moments acting on the ship due to hull, twin-propeller and twin-rudder is adopted, Khanfir et al. [], Dash et al. [].The coordinate system used for modeling is shown in Fig. of the coordinate system is fixed at the intersection of midship and central plane at the level of. The Reese Pole-Tongue Adapter for Weight Distribution Systems, item # RP, is not designed for use with a friction sway control bar like the Reese friction sway control kit, # The pole tongue adapter is designed for use with a weight distribution system with chain hangers.

Effects of Sway Acceleration Control on Rollover Propensity and an active anti-roll bar system has been created. A nonlinear rollover model on a Yaw/Roll model with nonlinear tire is used to describe the vehicle dynamics for a quasi LCV (Light Commercial Vehicle) and its rollover prevention system, and the rollover predictor based on a Time. The resulting trailer sway characteristics for each loading condition then were compared to published trailer sway stability criteria [2, 3] to determine the suitability of this particular tow vehicle-trailer combination for use by the public in a rental market. The impact of a suspension malfunction on the trailer stability was also studied.


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Sway, yaw, and roll coupling effects on straight line stability of submersibles by Daniel J. Cunningham Download PDF EPUB FB2

Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Sway, yaw, and roll coupling effects on straight line stability of submersibles. Sway, yaw, and roll coupling effects on straight line. SWAY, YAW, AND ROLL COUPLING EFFECTS ON STRAIGHT LINE STABILITY OF SUBMERSIBLES by Daniel J.

Cunningham, II March, Thesis Advisor: Fotis A. Papoulias Approved for public release; distribution is unlimited 93 4 61 0`6. Consistently, a simplified stability analysis showed the relevance of nonlinear-restoring coefficients, first those connected with the sway-yaw coupling then those associated with the roll-yaw.

Fig. 3 shows the typical variations of angles of attack α and sideslip angles β during the coupled motions for each coupling ratio at θ = 20 °.In these coupling ratios, the one equals is the most special. It is approximately equal to the value of tan θ ≈ At this coupling ratio, the test model has the largest effect of coupling between yaw and roll, with the rotation taking Cited by: 1.

For the coupling terms of sway-yaw, yaw-roll or roll-sway, there are fair correspondences. For the prediction of the roll damping term, a proper method of approximation which includes the effects of viscous damping, advance speed, bilge keels and frequency of motion should be developed.

Availability: Find a library where document is available. Thus, the yaw-roll coupling effects are necessarily taken into the prediction of lateral-directional departure.

Flight simulations of departure behavior. In order to further verify the yaw-roll coupling effects on the lateral-directional departure characteristics, both quasi-steady model and β ̇ model are used for flight simulations.

Previous studies have shown that in straight line motion, the coupling of the sway, yaw, and roll equations produce oscillating losses of stability in the system. [Ref. 5] Introducing a nonzero pitch angle to the vehicles motion will allow us to study the changes to the stability domain for a variety of environmental conditions.

This paper investigates sway, roll and yaw motions of a floating body with the aim to determine coupled motion characteristics based on the order-wise analysis of hydrodynamic coefficients.

To compute the hydrodynamic coefficients and wave force exerted on the floating body, we employ speed-dependent strip theory. The governing equations are solved analytically for linear restoring moment.

The Sway & Yaw modes are not restored hydrostatically; In order to study the nonlinearity introduced by viscous effects, it is useful to isolate the Roll equation. It turns out that in spite of the symmetry of the cross coupling coefficients, the effects of Roll on Sway-Yaw is far weaker than the effect of Sway-Yaw upon Roll.

Motion Roll, Pitch, Yaw, Sway, Surge, Heave and Traction Loss explained Updated: May 23 This post is intended to explain in more details what the heck are those very complicated terms for non-engineering people like me.

Sway bars explained Basically sway bars reduce roll and dramatically improve handling. They connect one side of the suspension to the other with attachment points generally on. "RE: Adverse yaw and roll coupling"z The adverse yaw portion of my first message is correct, the roll-yaw coupling portion isn't.

You are correct, as the rudder is deflected at knife edge it should change the amount of induced drag created by the surface, and thus cause the nose of the aircraft to move in pitch. For this incident-wave case, the sway–roll–yaw coupling is responsible for a PR resonance in the case of a pure mooring-line system (see the enlarged view in figure 13 b).

The PR is avoided by a DP giving 30% of the critical damping, whereas, among the three damping conditions, only 60% of the critical damping is suitable to control the yaw. Effects of Inclines. The effect of an incline also has an effect on towing.

If you park your caravan across an incline, and un-hitch the car, if you were then to take the hand brake off, the caravan will turn, so its hitch (assuming that the nose weight is correct) to point down hill shortly before rolling off into the sunset.

Lets have a. A sway bar (also known as a stabilizer bar, anti-roll bar, anti-sway bar) is used to keep the car body from leaning excessively to the side. Stabilizer bar bushing and links can be easily checked.

If you notice that they are loose or have any play they need to be replaced. The sway bar itself almost never gets damaged, it is the sway bar bushings and sway bar links that wear quite often. coupling roll and yaw rates of rad/sec are found with control effort of yaw spinning thruster times roll spinning due to inertia inequality effects.

Keywords—Coupling roll and yaw spinull state feedback, f control, linear Quadratic Gaussian optimizer, Palapa B2R satellite.

INTRODUCTION ATELLITES are nowadays owned by many. lift-line. The {3} frame’s orientation, relative to the {2} frame, is defined by two fixed angle rotations, which are the sway degrees-of-freedom as shown in Figure 4.

Specifically, the radial sway is a rotation about the – Y2 axis. The angle of the radial sway is called “theta”, θ. The tangent sway is a. The coupling process can also be visualised as an alternating flow of energy. When a wheelset swivels, it acquires angular momentum together with kinetic energy associated with its rotation about a vertical axis.

And likewise, when the wheelset moves laterally it acquires kinetic energy of the kind we associate with straight-line motion. As the aircraft yaws, the sideforce on the fin therefore exerts an anti-clockwise rolling moment.

The overall result of these two opposing tendencies depends on the aircraft design. The cross­coupling of yaw and roll movements is an important feature in.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): This work represents a further step of the physical study documented by Greco and Lugni (b) and Greco et al. (). Three-dimensional experiments have been performed on a FPSO model in regular waves to investigate the occurrence of parametric roll, the occurrence and features of water on deck and bottom slamming.Postural sway area and sway radius were analyzed in a group of 9 patients and 46 controls of both genders.

Subject's spontaneous sway was recorded while standing quiet on a force platform for s, with eyes open and then closed. Reducing Caravan Sway. Reducing caravan sway (yaw) necessitates These mechanisms ‘lock-up the tow ball’. Tow vehicle and caravan are thus literally held in a straight line.

Normal cornering is enabled by tyre side-wall and footprint distortion. happens. And why. It shows how to assess your own rig’s probable stability. It also.