By Ranjan Ganguli

This publication addresses the answer of rotating beam free-vibration difficulties utilizing the finite point procedure. It offers an advent to the governing equation of a rotating beam, prior to outlining the answer methods utilizing Rayleigh-Ritz, Galerkin and finite aspect equipment. the opportunity of enhancing the convergence of finite point tools via a sensible number of interpolation features, that are in the direction of the matter physics, can be addressed. The booklet deals a worthy consultant for college kids and researchers engaged on rotating beam difficulties – vital engineering constructions utilized in helicopter rotors, wind generators, gasoline generators, steam generators and propellers – and their functions. it will probably even be used as a textbook for specialised graduate classes on complicated functions of finite aspect analysis.

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Q¨8 ⎫ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎬ . . . . . . . K38 . K48 . . . . K88 ⎤⎧ q3 ⎪ ⎪ ⎪ ⎥⎪ q ⎪ 4 ⎥⎪ ⎥⎨ . ⎥ ⎥⎪ . ⎥⎪ ⎪ ⎦⎪ . ⎪ ⎪ ⎩ q8 ⎫ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎬ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎭ + ⎧ Q3 ⎪ ⎪ ⎪ ⎪ Q ⎪ 4 ⎪ ⎨ . = ⎪ ⎪ . ⎪ ⎪ ⎪ ⎪ ⎪ . ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ ⎭ Q8 ⎫ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎬ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎭ The corresponding eigenvalue problem can be easily solved to obtain the frequency and mode shapes. 13 To find the rotating and non-rotating natural frequencies of the cantilever uniform beam for 1 element with 2 degree of freedom. Assume EI (flexural rigidity) = 100000 Nm2 , m (mass per unit length) = 5 Kg/m and R (radius of beam) = 10 m.

Use Rr and Rr as the two admissible functions. 8138 EI R4 m Here, the first frequency is well predicted. 10 Find Y2 (r) for use in the Rayleigh–Ritz method. 1. Using this as admissible function for Rayleigh–Ritz method, find the first two frequencies of a cantilever beam. Solution: w(r, t) = Y1 (r)q1 t + Y2 (r)q2 (t) where, r 2 r 3 1 r 4 −2 + R R 2 R We now assume that r 3 r 4 r 5 Y2 (r) = a +b +c R R R This function already satisfies the geometric boundary conditions Y2 (0) = 0 and Y2 (0) = 0.

Q8 ⎫ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎬ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎭ The corresponding eigenvalue problem can be easily solved to obtain the frequency and mode shapes. 13 To find the rotating and non-rotating natural frequencies of the cantilever uniform beam for 1 element with 2 degree of freedom. Assume EI (flexural rigidity) = 100000 Nm2 , m (mass per unit length) = 5 Kg/m and R (radius of beam) = 10 m. 1 ⎤ ⎦ ⎤ ⎦ Eigenvalues and Eigenvectors of the matrix can be determined as, The characteristic equation, Kij − Dmij = 0.

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