Search results for: the-rotating-beam-problem-in-helicopter-dynamics

The Rotating Beam Problem in Helicopter Dynamics

Author : Ranjan Ganguli
File Size : 37.65 MB
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The book addresses computational methods for solving the problem of vibration, response, loads and stability of a helicopter rotor blade modeled as a rotating beam with flap or out-of-plane bending. The focus is on explaining the implementation of the finite element method in the space and time domain for the free vibration, aeroelastic response and stability problems. The use of Floquet analysis for the aeroelastic stability analysis of rotor blades is also shown. The contents of the book will be useful to researchers in aerodynamics and applied mechanics, and will also serve well professionals working in the aerospace industry.

Finite Element Analysis of Rotating Beams

Author : Ranjan Ganguli
File Size : 47.49 MB
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This book addresses the solution of rotating beam free-vibration problems using the finite element method. It provides an introduction to the governing equation of a rotating beam, before outlining the solution procedures using Rayleigh-Ritz, Galerkin and finite element methods. The possibility of improving the convergence of finite element methods through a judicious selection of interpolation functions, which are closer to the problem physics, is also addressed. The book offers a valuable guide for students and researchers working on rotating beam problems – important engineering structures used in helicopter rotors, wind turbines, gas turbines, steam turbines and propellers – and their applications. It can also be used as a textbook for specialized graduate and professional courses on advanced applications of finite element analysis.

Proceedings of the 14th International Conference on Vibration Problems

Author : Evangelos J. Sapountzakis
File Size : 26.19 MB
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This book presents the select proceedings of the 14th International Conference on Vibration Problems (ICOVP 2019) held in Crete, Greece. The volume brings together contributions from researchers working on vibration related problems in a wide variety of engineering disciplines such as mechanical engineering, wind and earthquake engineering, nuclear engineering, aeronautics, robotics, and transport systems. The focus is on latest developments and cutting-edge methods in wave mechanics and vibrations, and includes theoretical, experimental, as well as applied studies. The range of topics and the up-to-date results covered in this volume make this interesting for students, researchers, and professionals alike.

Integrated Technology Rotor Methodology Assessment Workshop

Author : Michael J. McNulty
File Size : 33.65 MB
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Fundamentals of Helicopter Dynamics

Author : C. Venkatesan
File Size : 70.26 MB
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Helicopter Dynamics Introduced in an Organized and Systematic Manner A result of lecture notes for a graduate-level introductory course as well as the culmination of a series of lectures given to designers, engineers, operators, users, and researchers, Fundamentals of Helicopter Dynamics provides a fundamental understanding and a thorough overview of helicopter dynamics and aerodynamics. Written at a basic level, this text starts from first principles and moves fluidly onward from simple to more complex systems. Gain Valuable Insight on Helicopter Theory Divided into 11 chapters, this text covers historical development, hovering and vertical flight, simplified rotor blade model in flap mode, and forward flight. It devotes two chapters to the aeroelastic response and stability analysis of isolated rotor blade in uncoupled and coupled modes. Three chapters address the modeling of coupled rotor–fuselage dynamics and the associated flight dynamic stability, and provide a simplified analysis of the ground resonance aeromechanical stability of a helicopter. Explains equations derived from first principles and approximations Contains a complete set of equations which can be used for preliminary studies Requires a basic first–level course in dynamics, as well as a basic first–level course in aerodynamics Useful for any student who wants to learn the complexities of dynamics in a flying vehicle, Fundamentals of Helicopter Dynamics is an ideal resource for aerospace/aeronautical, helicopter, and mechanical/control engineers, as well as air force schools and helicopter/rotorcraft manufacturers.

Computer Modeling in Engineering Sciences

Author :
File Size : 24.10 MB
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Journal of the American Helicopter Society

Author : American Helicopter Society
File Size : 20.63 MB
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Dynamic Load Problems Associated with Helicopters and V STOL Aircraft

Author :
File Size : 60.75 MB
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Journal of Applied Mechanics

Author :
File Size : 34.63 MB
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NASA SP

Author :
File Size : 30.58 MB
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A Collection of Technical Papers Structural dynamics

Author :
File Size : 85.21 MB
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Industrial Mathematics

Author :
File Size : 57.30 MB
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International Aerospace Abstracts

Author :
File Size : 24.4 MB
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Stochastic Processes in Dynamical Problems

Author :
File Size : 86.58 MB
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Statics and Rotational Dynamics of Composite Beams

Author : Mehrdaad Ghorashi
File Size : 51.45 MB
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This book presents a comprehensive study of the nonlinear statics and dynamics of composite beams and consists of solutions with and without active elements embedded in the beams. The static solution provides the initial conditions for the dynamic analysis. The dynamic problems considered include the analyses of clamped (hingeless) and articulated (hinged) accelerating rotating beams. Two independent numerical solutions for the steady state and the transient responses are presented. The author illustrates that the transient solution of the nonlinear formulation of accelerating rotating beam converges to the steady state solution obtained by the shooting method. Other key areas considered include calculation of the effect of perturbing the steady state solution, coupled nonlinear flap-lag dynamics of a rotating articulated beam with hinge offset and aerodynamic damping, and static and dynamic responses of nonlinear composite beams with embedded anisotropic piezo-composite actuators. The book is intended as a thorough study of nonlinear elasticity of slender beams and is targeted to researchers, graduate students, and practicing engineers in the fields of structural dynamics, aerospace structures, and mechanical engineering.

Stability of Nonuniform Rotor Blades in Hover Using a Mixed Formulation

Author :
File Size : 60.16 MB
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A mixed formulation for calculating static equilibrium and stability eigenvalues of nonuniform rotor blades in hover is presented. The static equilibrium equations are nonlinear and are solved by an accurate and efficient collocation method. The linearized perturbation equations are solved by a one-step, second-order integration scheme. The numerical results correlate very well with published results from a nearly identical stability analysis based on a displacement formulation. Slight differences in the results are traced to terms in the equations that relate moments to to derivatives of rotations. With the present ordering scheme, in which terms of the order of squares of rotations are neglected with respect to unity, it is not possible to achieve completely equivalent models based on mixed and displacement formulations. A study of the one-step methods reveals that a second-order Taylor expansion is necessary to achieve good convergence for nonuniform rotating blades. Numerical results for a hypothetical nonuniform blade, including the nonlinear static equilibrium solution, were obtained with no more effort or computer time than that required for a uniform blade with the present analysis. (Author).

Methods for Aircraft State and Parametar Identification

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File Size : 25.41 MB
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Vertica

Author :
File Size : 41.61 MB
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A Simulation Study of Active Feedback Supression of Dynamic Response in Helicopter Rotor Blades

Author :
File Size : 82.31 MB
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AGARD Conference Proceedings

Author : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
File Size : 66.82 MB
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