3 edition of **A computational examination of directional stability for smooth and chined forebodies at High-α** found in the catalog.

A computational examination of directional stability for smooth and chined forebodies at High-α

- 379 Want to read
- 7 Currently reading

Published
**1992**
by National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, National Technical Information Service, distributor] in [Washington, DC], [Springfield, Va
.

Written in English

- Aerodynamic characteristics.,
- Computation.,
- Computational fluid dynamics.,
- Cross flow.,
- Directional stability.,
- Flow distribution.,
- Forebodies.,
- Turbulence models.

**Edition Notes**

Statement | Ramakrishnan Ravi and William H. Mason. |

Series | NASA contractor report -- 4465, NASA contractor report -- NASA CR-4465. |

Contributions | Mason, William H., United States. National Aeronautics and Space Administration. Scientific and Technical Information Division. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL17125936M |

Chapter 5: Internal Stability. Advances in Computational Stability Analysis. Edited by: Safa Bozkurt Coskun. ISBN , PDF ISBN , Published

New Computational Algorithms for Analyzing the Stability of the Differential Equations System H. Saberi, Najafi and A.H. Refahi Sheikhani Department of Applied Mathematics Faculty of Mathematical Sciences University of Guilan Rasht, Iran [email protected], [email protected] Received: Octo ; Accepted: May 9, Abstract. In designing an airplane a great deal of effort is spent in developing the desired degree of stability around all three axes. But longitudinal stability about the lateral axis is considered to be the most affected by certain variables in various flight conditions. As we learned earlier, longitudinal stability is the quality which makes an airplane stable about its lateral axis.

Evaluation of these interference fields on an approximate theoretical basis leads to a method for predicting directional stability of supersonic airplanes. Body shape, wing position and plan form, vertical tail position and plan form, and ventral fins are taken into account. Exam No. 1 CE Structural stability Due: Novem Problem no. 1 (25) Consider the case of a column that is pinned at one end, and braced at the other end by an elastic brace with stiffness equal to beta (β). Assume that the differential equation for column flexural buckling governs, and the solution is .

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Get this from a library. A computational examination of directional stability for smooth and chined forebodies at High-[alpha]. [R Ravi; William H Mason; United States. National Aeronautics and Space Administration.

Scientific and Technical Information Division.]. A COMPUTATIONAL EXAMINATION OF DIRECTIONAL STABILITY FOR SM(NTrH AND CHINED FOREBODIES AT HIGH-a R. Ravi William t-LMason Virginia Polytechnic Institute and State University SUMMARY Computational Fluid Dynamics (CFD) has been used to study aircraft forebody flowfields at low-speed, high angle-of-attack conditions with sideslip.

W.H. Mason and R. Ravi, “Computational Study of the F-5A Forebody Emphasizing Directional Stability,” Journal of Aircraft, Vol. 31, No.

3, May-Junepp. Ravi and W.H. Mason, “A Computational Examination of Directional Stability for Smooth and Chined Forebodies at High-a,” NASA CRAugust Directional stability is defined to prevail if the angle formed by the straight line between the crack tips and the original crack direction eventually decreases during crack growth.

This is shown to be the case if, and only if, the principal stress perpendicular to the original crack is Cited by: Directional stability is an important performance criterion for alpine skis and has been shown to correlate with the second moment of running surface pressure distribution.

However, this stability index is complex to measure while skiing and is not practical for testing many skis. It therefore remains unclear what range one can expect in the variation of stability between commercially Author: Jonas Truong, Alexis Lussier Desbiens.

1. Introduction. In the late s and early s, the tactical advantages of super maneuverability for fighter aircraft increased interest in post-stall maneuverability.1, 2 Requirement and expectation for the aerodynamic design of moderate to high angle of attack have become higher for modern fighter aircraft.

On the other hand, static stability has always been critical and inevitable in. In The Maritime Engineering Reference Book, Experiments and Trials.

As in the case of the directional stability of surface ships, the derivatives needed in studying submarine performance can be obtained in conventional ship tanks using planar motion mechanisms and in rotating arm facilities. The model is run upright and on its side with and without propellers, hydroplanes and.

to traditional fighters with smooth forebodies. “A Computational Examination of Directional Stability for Smooth and Chined Fo rebodies at. High-α,” NASA Contractor Report. Computational Stability It is a fact of life that numerical approximations to differential equations may exhibit unstable behavior.

That is, computational results may include exponentially growing and sometimes oscillating features that bear no relation to the solution of the original differential equation. Stability is a matter of degree, and an unstable discretization is one for which the modulus of continuity of L 1 h is very large.

To illustrate the notion of instability, and to motivate the quantitative measure of stability we shall introduce below, we consider a simpler numerical problem than the discretization of a di erential equation. directional stability Richtungsstabilität f.

Directional stability is stability around the vertical or normal axis. The most important feature that affects directional stability is the vertical tail surface, that is, the fin and rudder. Keel effect and sweepback also contribute to directional stability to some degree.

Book. Jan ; Josef Rom A computational examination of directional stability for smooth and chined forebodies at high-alpha. Article. Sep ; R. Ravi; William Mason. • Use stability balls on a clean, smooth surface (floor or carpet), free of debris and sharp objects that may cause wear on ball surfaces or puncture the ball.

• Clean stability balls regularly with water or mild soapy water. Avoid using chemical cleaners that may damage the ball exterior. Using Stability Balls. Stability balls are versatile. Theoretical and computational studies of stability in high-speed boundary layers have been carried out with an emphasis on the multimode decomposition including nonparallel flow effects.

The multimode decomposition can serve to analysis of DNS results for transitional boundary layers. It is shown that using. The concept of stability of a computational algorithm has been made concrete in applications to grid-projection methods (cf.) and in applications to iterative methods (cf.).

There are also other definitions of the stability of a computational algorithm (cf. e.g. [1], [3]). The maximum flow of power through a particular point in the power system without loss of stability when large and sudden disturbances occur d. All of these e. None of these Answer Explanation ANSWER: The maximum flow of power through a particular point in the power system without loss of stability when large and sudden disturbances occur.

Directional and Lateral Static Stability Table 1: Conventions and Notations. Body Axes Velocities Forces Moments xb u X Rolling Moment L yb v Y Pitching Moment M zb w Z Yawing Moment N 1.

Non-dimensionalization: X = QSCX, Y = QSCY, and Z = QSCZ L = QSbCL, M = QScCM, and N = QSbCN 2. Angle of attack α = tan 1 w u ≃ w V and side slip angle β. The information on this website is provided without warantee or guarantee of the accuracy of the contents.

Use it at your own risk. The author shall not be liable to any viewer of this site or any third party for any damages arising from the use of this site, whether direct or indirect. gives a computational process with original data and intermediate results.Usually and the operator consists of a finite number of arithmetic operations.

As a rule depends not on all the intermediate results obtained earlier. The number may be given in advance or determined in the course of the computational process itself. In the latter case depends on (e.g. if is the number of iterations. We will discuss the important notions of stability and static determinacy.

These are concepts that often are not presented clearly enough in some of the textbooks, causing confusion to students. Kinematic Considerations - Rigid Body Motion Kinematic considerations - Infinitesimal Motions An alternative approach is the so-called projective reconstruction, which looks for an arbitrary 3-by-4 matrix Mj satisfying pij 1 = cijMj Pi 1 (i.e.

removing the constraints on the structure of the fundamental matrix.) Observe that, if Mj,Pj are a solution of the above equation, then for any non-singular matrix Q, MjQ and Q−1Pj is also a solution of the above.CEFall Final Exam 1 / 7 1.

Stability & Determinacy. Show your answers and calculations on this sheet. Determine if each of the following structures .