Method for dimensioning an elastic structure subjected to a fluid in motion
AssigneeInstitute Francais du Petrole
InventorCédric Le Cunff
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Abstract
The invention is a method for dimensioning or adapting an elastic structure immersed in a fluid in motion, the structure having a length Lt. The method comprises: a) the natural excitation modes of the structure and their number N are defined; b) for at least a given time t for an excitation mode of the structure, the various holding zones LR over length Lt and, for each holding zone, the excitation force FR corresponding to the excited natural mode r are determined; c) step b) is carried out for all the natural modes defined in step a); and d) the vibration amplitude response A of the elastic structure over part of length Lt is determined.
Claims21
A method for dimensioning or adapting an elastic structure having a length Lt and immersed in a fluid in motion, comprising:
- a) defining natural excitation modes of the structure;
- b) determining for at least a given time t for an excitation mode of the structure holding zones LR over the length Lt and, for each holding zone, an excitation force FR corresponding to an excited natural mode r;
- c) carrying out step b) for all natural modes defined in step a);
- and
- d) determining a vibration amplitude response A of the elastic structure over a part of the length Lt by accounting for an effect of the excitation forces FR on each natural vibration mode defined in step a) so as to obtain a characteristic allowing dimensioning or adapting of the structure to mechanical stresses applied by the fluid in motion.
Dependencies are inferred from the claim text.