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Author: Shaojie Tang
Publisher:
ISBN: 9781732632301
Category :
Languages : en
Pages : 472
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Book Description
This book presents a new scientific discovery about the nonlinear instability and inertial coupling effects for aircrafts, land vehicles, and ships. It focuses on the dynamic instability and inertial couplings of the rotational motions of these vehicles and provides analytical solutions for the nonlinear governing equations without linearization. A nonlinear stability theorem is proven analytically, numerically, and experimentally. The threshold for the nonlinear instability is given. The book covers topics such as the fundamental mistakes in automotive, aviation, and naval architecture industries; energy flow patterns of aircrafts, ships, land vehicles, and rigid body torque-free motion; the nonlinear solution of vehicle dynamics; nonlinear instabilities and inertial coupling effects of ships, aircrafts, and land vehicles. It reveals the mechanism of broaching and capsizing of ships; a phase locked-in phenomenon for ships; Dutch roll, wing rock, Pilot-Induced-Oscillation, and upset of aircrafts including un-commanded roll, pitch, and yaw; and rollover of land vehicles. The unique feature of this book is to provide scientific analyses and explanations for the root causes for two aircraft incidents and 16 aircraft crashes based on their FDR data, for two Ro/Ro ship capsizes, two cruise ship capsizes. An inertial coupling factor is proposed to measure the effect of the inertial coupling. A dynamic stability factor is proposed to indicate how dynamically stable a vehicle is. This book provides evidences based on the analytical analyses, the numerical simulations, the physical experiments, and the highway fatality data to prove that the Anti-Brake System and Electronic Stability Control cause more rollovers and fatalities. The autopilot of aircrafts is proven to cause some nonlinear instabilities and crashes. Three recipes for aircraft crashes during takeoff, landing approach, and cruise leveling are given. A mechanical demonstrator is also given.
Author: Shaojie Tang
Publisher:
ISBN: 9781732632301
Category :
Languages : en
Pages : 472
Get Book Here
Book Description
This book presents a new scientific discovery about the nonlinear instability and inertial coupling effects for aircrafts, land vehicles, and ships. It focuses on the dynamic instability and inertial couplings of the rotational motions of these vehicles and provides analytical solutions for the nonlinear governing equations without linearization. A nonlinear stability theorem is proven analytically, numerically, and experimentally. The threshold for the nonlinear instability is given. The book covers topics such as the fundamental mistakes in automotive, aviation, and naval architecture industries; energy flow patterns of aircrafts, ships, land vehicles, and rigid body torque-free motion; the nonlinear solution of vehicle dynamics; nonlinear instabilities and inertial coupling effects of ships, aircrafts, and land vehicles. It reveals the mechanism of broaching and capsizing of ships; a phase locked-in phenomenon for ships; Dutch roll, wing rock, Pilot-Induced-Oscillation, and upset of aircrafts including un-commanded roll, pitch, and yaw; and rollover of land vehicles. The unique feature of this book is to provide scientific analyses and explanations for the root causes for two aircraft incidents and 16 aircraft crashes based on their FDR data, for two Ro/Ro ship capsizes, two cruise ship capsizes. An inertial coupling factor is proposed to measure the effect of the inertial coupling. A dynamic stability factor is proposed to indicate how dynamically stable a vehicle is. This book provides evidences based on the analytical analyses, the numerical simulations, the physical experiments, and the highway fatality data to prove that the Anti-Brake System and Electronic Stability Control cause more rollovers and fatalities. The autopilot of aircrafts is proven to cause some nonlinear instabilities and crashes. Three recipes for aircraft crashes during takeoff, landing approach, and cruise leveling are given. A mechanical demonstrator is also given.
Author: John M. Goodman
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 716
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Book Description
Author: W. D. Kinney
Publisher:
ISBN:
Category : Ships
Languages : en
Pages : 66
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Book Description
The equations of motion for a ship pitching and rolling in a calm sea were found to be coupled by means of a second order term in the rolling equation of motion. When the pitching motion is simple harmonic the equation of motion in roll is of the Mathieu type, the two independent parameters being pitching amplitude and frequency. The stability diagram of the Mathieu equation including the effect of linear damping is determined theoretically and verified by solving the Mathieu equation on an analogue computer. In experiments with one ship model form, it was found that the transition from stable to unstable motion occurred for the value of the parameters predicted by the theory, and that the rolling motions obtained experimentally closely resembled the computer solutions. It was concluded that (1) unstable rolling motions are possible for very small pitching amplitudes, (2) when the natural frequency of pitch is twice that of roll the amplitude required to produce unstable motion is a minimum, and (3) for any pitching frequency, the greater the amount of damping, the greater the amplitude of pitching must become to produce unstable rolling motions. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 724
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Book Description
Author:
Publisher:
ISBN:
Category : Distributed parameter systems
Languages : en
Pages : 620
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Book Description
Author: Thomas Cameron Simon
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
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Book Description
A study was made to determine the feasibility of programing an analog simulation of aircraft stability on a general-purpose analog computer using non-linear differential equations. The simulation was to demonstrate the effects of inertial cross-coupling. An F-4 aircraft was simulated at two different reference flight conditions using the equations derived in the study. (Author).
Author: Tomasz Krysinski
Publisher: John Wiley & Sons
ISBN: 1118600959
Category : Technology & Engineering
Languages : en
Pages : 282
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Book Description
This book presents a study of the stability of mechanical systems, i.e. their free response when they are removed from their position of equilibrium after a temporary disturbance. After reviewing the main analytical methods of the dynamical stability of systems, it highlights the fundamental difference in nature between the phenomena of forced resonance vibration of mechanical systems subjected to an imposed excitation and instabilities that characterize their free response. It specifically develops instabilities arising from the rotor–structure coupling, instability of control systems, the self-sustained instabilities associated with the presence of internal damping and instabilities related to the fluid–structure coupling for fixed and rotating structures. For an original approach following the analysis of instability phenomena, the book provides examples of solutions obtained by passive or active methods.
Author: Malcolm J. Abzug
Publisher: Cambridge University Press
ISBN: 1107320194
Category : Technology & Engineering
Languages : en
Pages : 417
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Book Description
From the early machines to today's sophisticated aircraft, stability and control have always been crucial considerations. In this second edition, Abzug and Larrabee again forge through the history of aviation technologies to present an informal history of the personalities and the events, the art and the science of airplane stability and control. The book includes never-before-available impressions of those active in the field, from pre-Wright brothers airplane and glider builders through to contemporary aircraft designers. Arranged thematically, the book deals with early developments, research centers, the effects of power on stability and control, the discovery of inertial coupling, the challenge of stealth aerodynamics, a look toward the future, and much more. It is profusely illustrated with photographs and figures, and includes brief biographies of noted stability and control figures along with a core bibliography. Professionals, students, and aviation enthusiasts alike will appreciate this readable history of airplane stability and control.
Author: T. Ariaratnam
Publisher: CRC Press
ISBN: 1000152979
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book contains a series of original contributions in the area of Stochastic Dynamics, which demonstrates the impact of Mike Lin's research and teaching in the area of random vibration and structural dynamics.
Author: Ye Zhou
Publisher: Cambridge University Press
ISBN: 1108489648
Category : Mathematics
Languages : en
Pages : 611
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Book Description
The first comprehensive reference guide to turbulent mixing driven by Rayleigh-Taylor, Richtmyer-Meshkov and Kelvin-Helmholtz instabilities.
