New PDF release: Computational techniques of rotor dynamics with the finite

By Arne Vollan

ISBN-10: 1439847703

ISBN-13: 9781439847701

ISBN-10: 143984772X

ISBN-13: 9781439847725

"This publication covers utilizing sensible computational suggestions for simulating habit of rotational constructions after which utilizing the consequences to enhance constancy and function. functions of rotor dynamics are linked to vital power equipment, similar to turbines and wind generators, in addition to plane engines and propellers. This booklet provides ideas that hire the finite aspect technique for Read more...

summary: "This publication covers utilizing sensible computational options for simulating habit of rotational buildings after which utilizing the implications to enhance constancy and function. functions of rotor dynamics are linked to vital power equipment, similar to turbines and wind generators, in addition to plane engines and propellers. This publication provides recommendations that hire the finite point procedure for modeling and computation of forces linked to the rotational phenomenon. The authors additionally talk about state of the art engineering software program used for computational simulation, together with eigenvalue research suggestions used to make sure numerical accuracy of the simulations"

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Extra resources for Computational techniques of rotor dynamics with the finite element method

Example text

101) ∂{α} The derivative with respect to the velocity, again by canceling the 2-s, is ∂T = m([ A]T [ A]{α} + [ A]T [ A]{α}). 102) ∂{α} Executing the time derivative we obtain d ∂T = m([ A]T [ A]{α} + [ A]T [ A]{α} + [ A]T [ A]{α} dt ∂{α} +[ A]T [ A]{α} + [ A]T [ A]{α}). 103) Note that the possible second-order derivatives of the [A] matrix are not computed. The simplified (purely kinetic energy-based) Lagrange’s equation in this case is d  ∂T  ∂T − = 0. 101). The equation of motion with the remaining terms is m(2[ A]T [ A]{α} + [ A]T [ A]{α}) = 0.

53) 18 Computational Techniques of Rotor Dynamics The derivative with respect to the nodal velocity vector and the following time differentiation results in the equation d  ∂T  = m(Ω[ P]T {ρ} + [ I ]{ρ}). 52) and using the relation −[ P] = [ P]T yields m(Ω[ P]T {ρ} + [ I ]{ρ} − Ω2 [ J ]{r } − Ω2 [ J ]{ρ} + Ω[ P]T {ρ}) = 0. 55) Collecting acceleration, velocity, and displacement terms, the equation of motion of the particle in terms of the nodal translational displacements can be written as m[ I ]{ρ} + 2Ωm[ P]{ρ} − Ω2 m[ J ]{ρ} = Ω2 m[ J ]{r }.

It is also much simpler than the concluding equation of the last section, but that is deceiving. In the fixed system equilibrium, only the nodal rotations contributed to the gyroscopic matrix, and the nodal displacements simply described Newton’s second law. 1. 2 Coupled Solution Formulations In Chapter 1, we developed a methodology to represent two distinct nodal displacements of the particles of a rotating structure. In this chapter we focus on coupling the rotating part’s displacements to each other as well as to the stationary part of the structure.

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Computational techniques of rotor dynamics with the finite element method by Arne Vollan


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