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CRITICAL SPEEDS COMPUTATION
Several methods are available and they can be used to solve bending, axial, torsional or coupled problems.
With the sweeping method, the user defines ranges of rotational frequencies whithin which complex eigenvalues have to be
computed.
The direct method allows directly obtaining the critical speeds as eigensolutions. It is used for undamped systems with
constant stiffness.
PICTURE AT A GIVEN TIME OR FREQUENCY
• It is possible to recombine the complex modes for a given phase
angle and to superimpose them on the initial structure.
Displacements, rotations and energies can be obtained;
• Complex displacements, rotations, forces, moments and
stresses after the harmonic response for a given frequency;
• Real displacements, rotations, forces, moments and
stresses after the transient response and for a
given time;
• For both frequency and time response,
it is possible to animate the result.
DOCUMENTATION
For direct access to information, the Users Guide and Help manual are available via your favorite navigator (HTML).
COUPLING SAMCEF ROTOR WITH OTHER SAMCEF PRODUCTS FAMILY
Compatibility between SAMCEF Rotor and other SAMCEF modules allows a linear/non-linear mechanical analysis on the same model. The file
compatibility between SAMCEF modules makes it possible to perform a structural calculation while taking into account the dynamic analysis of rotating
parts provided by SAMCEF Rotor.
SAMCEF Rotor can also be coupled with BOSS quattro, the application manager and optimization platform developed by SAMTECH.
The following SAMCEF modules are compatible with SAMCEF Rotor:
• SAMCEF Asef, Dynam, Stabi: linear static, modal and buckling analyses,
• SAMCEF Mecano: unique integrated software that solves non-linear structures and mechanisms problems. The software is declined to provide a
more specific answer to following analyses:
• MECANO Structure: dedicated to the non-linear analysis of structures,
• MECANO Motion: dedicated to the static, kinematical and dynamic analyses of flexible mechanisms,
• MECANO Cable: dedicated for the analysis of cable systems subjected to electro-dynamic and aerodynamic efforts,
• SAMCEF Thermal: Stationary and transient non-linear themes analysis,
• BOSS quattro : parametric studies, sensitivity analysis, statistical analysis, model updating, design of experiments and response surfaces.
PLATFORMS
SAMCEF Rotor is available on most UNIX platform and on Window NT, 2000 and XP Pro.
SENSITIVITY AND STATISTICAL ANALYSIS
In the frequency domain, it is possible to carry out a sensitivity analysis of the solution with respect to a variation of a set of design
parameters. These parameters can be the dynamic characteristics (stiffness, damping) of the bearing elements.
The sensitivities can then be used to estimate the standard deviation of the solution when the standard deviation of the parameters is
given.
FREQUENCY RESPONSE ANALYSIS
Several methods are available to compute the harmonic response to unbalances or asynchronous loads.
The Modal Method where the forces and matrices are reduced by projection in a modal basis and the Direct Method that allows taking into
account local non-linearities (clearances, non-linear stiffness, etc).
TRANSIENT RESPONSE ANALYSIS
Transient response simulates run-up (or run-down) and blade losses. It is using a
Newmark integration method. Non-linear effects such as clearances, squeeze-films,
hydrodynamic bearings or rubbing are solved using an iterative Newton scheme. An
automatic time stepping strategy is available. If necessary, an initial static computation can
be performed.
USER INTERFACE
• All features can be accessed through scrolling menus and data
acquisition boxes;
• Easy-to-use integrated CAD modeler helps modeling and data
preparation;
• Grouped management allowing to work independently of node
and mesh numbering;
• Functions Manager facilitating the definition of variable loads,
rotation speed or properties;
• The command language can be parameterized;
• The User’s Manual is available using HTML Browser.
CURVES
• The displacements, forces, reactions or stresses
obtained by the forced response and as a function
of time or frequency;
• Orbits after the transient analysis;
• Confidence range of the harmonic response after a
statistical analysis.
MODELING ENVIRONMENT
EIGENVALUES
• The damping coefficients and frequencies
as a function of the rotational speed
(Campbell diagram);
• The damping coefficients and frequencies
following a variation in certain design
　
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