$$$$ CAMPBELL NOTICE CHAT 11/09/12 21:15:17 7124 DATE 11/09/12 Procedure CAMPBELL Voir aussi: BALOURD, GYRO, CORI, KCEN ------------------ Compute the Campbell diagram for a rotating machine. The curve can be computed in 1/ the fixed frame (classical diagram with a beam type modelling with gyroscopic damping) 2/ the rotating frame (change of the natural frequencies taking into account the centrifuge and geometric stiffness and Coriolis pseudo dampin CAMPBELL TAB1 PRFREQ PRFREQ: LISTREEL with the rotation speed for which the Campbell diagram is com TAB1 Table containing: 1/ If the user has already computed the eigenmodes base: TAB1.'BASE_MODALE': Table containing the real eigenmodes (generated with VIBR option TBAS) 2/ if the user requires the calculation of the aigenmode base at each rotating (useful when the prestress geometric and the centrifuge stiffness are taken TAB1.'NMODES' : Number of eigenmodes to compute TAB1.'FREQ_PROCHE': Value of frequency close to the eigenfrequencies of the will be computed The mass, stiffness, damping and gyroscopic coupling can be given reduced on the eigenmodes base or not. TAB1.'MASS_PROJ': Mass matrix already reduced on the eigenmodes base TAB1.'MASSE': Complete mass matrix TAB1.'RIGI_PROJ': Stiffness matrix already reduced on the eigenmodes base TAB1.'RIGIDITE': Complete stiffness matrix TAB1.'AMOR_PROJ': Damping matrix already reduced on the eigenmodes base TAB1.'AMORTISSEMENT': Damping matrix For the classical Campbell diagram (in the fixed frame): TAB1.'KCOR_PROJ': Antisymetric stiffness matrix corresponding to the corotative damping (reduced on the eigenmodes base TAB1.'KCOROTATIF': Antisymetric stiffness matrix corresponding to the corotative damping TAB1.'GYRO_PROJ': Pseudo damping gyroscopic matrix reduced on the eigenmodes base TAB1.'GYROSCOPIQUE': Complete pseudo damping gyroscopic matrix For the Campbell diagramme in the rotating frame: TAB1.'CORI_PROJ': Pseudo damping Coriolis matrix reduced on the eigenmodes ba TAB1.'CORIOLIS': Complete pseudo damping Coriolis matrix TAB1.'KSIG_PROJ': Prestress geometric stiffness matrix reduced on the eigenmo TAB1.'KSIGMA': Prestress geometric stiffness matrix TAB1.'KCEN_PROJ': Centrifuge stiffness matrix reduced on the eigenmodes base TAB1.'KCENT': Complete centrifuge stiffness matrix The centrifuge and geometric stiffness and gyroscopic and Coriolis pseudo d are given for a unitary rotating speed (1 Hz, 1 rad/s or 1 round/min depending on the user choice) TAB1.'AFFICHAGE': VRAI if the values of rotating speed are plotted during the computation TAB1.'CLASSEMENT':VRAI if the user wants to class the eigenmodes (direct if the natural frequency is > 0 and retrogrades if the natural frequency <0) TAB1.'AXE_DIRECT': Vector necessary to define the direct and retrograde directions OUTPUT TAB1. i Tbale containing the results for the complex eigenmode i (N real eigenmodes give 2N complex modes) (TAB1. i). 'FREQUENCE_REELLE' : Evolution giving the real frequency in function of the rotating speed (TAB1. i). 'FREQUENCE_IMAGINAIRE': Evolution giving the imaginary frequency function of the rotating speed (TAB1. i). 'FREQUENCE_MODULE' : Evolution giving the frequency modulus in function of the rotating speed (TAB1. i). 'AMORTISSEMENT' : Evolution giving the damping ratio in function of the rotating speed PRFREQ: LISTREEL containing the rotating speed (Hz, rad/s ou other units) for which the Campbell diagramme is computed Remarks: --------- For each rotating speed, the frequency and damping values are ranged with increasing values. The line i coresponds to the ith frequency and a curve do not necessary correspond to the same eigenmode.
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