Differential Eigenvalue Problems with Particular Reference to Rotor Blade Bending
1968; Cambridge University Press; Volume: 19; Issue: 2 Linguagem: Inglês
10.1017/s0001925900004571
ISSN2398-2179
Autores Tópico(s)Cavitation Phenomena in Pumps
ResumoSummary A differential equation which contains an eigenvalue is considered as a pair of simultaneous differential equations by augmenting the main equation with the equation λ ′=0. This ensures the constancy of the eigenvalue λ . The differential eigenvalue problem is thus reduced to a pair of simultaneous non-linear differential equations with two-point boundary conditions. An iterative method for the solution of the two-point boundary value problem is described. To demonstrate the method, the normal modes and frequencies in flapping of a helicopter rotor blade are calculated. In the case considered the stiffness and mass/(unit length) of the blade have points of discontinuity. The method may also be applied when the blade parameters are given in the form of experimental data.
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