RITZ software: Dynamic analysis of structures of revolution containing fluids
Abstract
The method and corresponding program used to compute the dynamic characteristics of structures of revolution containing fluids are presented. The structure is broken down into simple elements for which the displacement field is described by orthogonal polynomials which are adapted to the geometry of the structure and whose degrees can be chosen to obtain desired accuracy. An original feature of the program is that the energy of the fluid is evaluated globally as a function of the shell displacement coordinates alone, without needing to introduce degrees of freedom in the liquid. Uses of the program include computing dynamic characteristics of liquid propellant launch vehicles (European launcher ARIANE) to help solve problems arising in payload dynamic coupling, and analyzing and controlling POGO effects.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 September 1978
 Bibcode:
 1978STIN...7916243F
 Keywords:

 Computer Programs;
 Dynamic Characteristics;
 Liquid Filled Shells;
 Rotating Fluids;
 Structural Analysis;
 Ariane Launch Vehicle;
 Fluid Dynamics;
 Modal Response;
 Pogo Effects;
 User Manuals (Computer Programs);
 Fluid Mechanics and Heat Transfer