SDT-rotor         Contents     Functions              PDF Index

rotor1d

• 1To2D
• 1To3D
• AddBearing
• AddBeam
• AddNodeRefine
• Skyline

Purpose This function gives some commands to help the meshing of 1D rotor. See section ?? for general details about 1d rotors and section 3.1.2 for a full example of 1d rotor meshing.

1To2D

From a 1d model with beam1 elements (masses are not converted for the moment), builds a 2d rotor.
LC l defines the max length of elements.

1To3D

From a 1d model with beam1 elements (masses are not converted for the moment), builds a 3d rotor. one can see section 3.1.3 for a tutorial.

• LC l defines the max length of elements.
  
• div n defines the number of sector of 3d mesh.
  

The grounded celas are assumed to be bearings. RBE3 rings are defined at each bearing.

AddBearing

This command add a rotor bearing as a celas element.
mo1d=rotor1d('AddBearing ...',mo1d,pos);
mo1d is a 1d rotor model pos is the x y z position of the bearing.

Command options are

• -keep if not present remove existing celas at given position.
• DOF DOF that defines the DOF concerned by bearing link.
• k k the spring stiffness.
• c c the spring damping.
• ProID ProID the spring ProID.

For example:
mo1d=rotor1d('AddBearing DOF -123 k 1e4 -keep',mo1d,pos);

AddBeam

mo1d=rotor1d('AddBeam ...',mo1d);
This command adds a beam on the axis of the rotor, accordin to following argument specified as command option:

• x1 x1 beginning of the beam in the axis direction
• x2 x2 end of the beam in the axis direction
• r1 r1 inner radius of the beam. By default 0.
• r2 r2 outer radius of the beam.
• MatID MatID MatID. If not given new MatID is used.
• ProID ProID ProID. Note that the associated element property contains the section information according to r1 and r2, so that existing ProID will be lost. If not given new ProID is used.
• -refine Refine existing beams to ensure that beams have coincident nodes.

For example
mo1d=rotor1d('AddBeam x1 0.5 x2 0.7 r1 0.11 r2 0.77 MatID 1',mo1d);

AddNodeRefine

[mo1d,ind]=rotor1d('AddNodeRefine ...',mo1d,xyz);
This low level call command adds nodes at given positions xyz (one row per node, 3 columns x y and z, or one column to define distance along the rotor axis) refining beams of the model mo1d if needed.
Command options are:

• -epsl epsl Tolerance for new node adding.

For example
[mo1d,ind]=rotor1d('AddNodeRefine',mo1d,[0.2 0 0]);

Skyline

mdl=rotor1d('Skyline...',xy);
This command can be used to generate rotor model from skyline description. xy is a 2 column matrix whose 1st column defines position according to rotation axis, and 2nd column defines radius at corresponding positions. One can define multiple parts rotor using separator NaN in the 1st column. For 2D rotor meshing, use [NaN r] to define internal radius r of the corresponding part.

• SkylineToBeam builds 1d beam rotor model. See example in 1D subsection of section ??.
  
• SkylineTo2D a 2D rotor model (that can be used to generate 3D model by revolution, or using cyclic symetry, see rotor2d BuildFrom2D)), see example in 2D subsection of section ??.
  

Following command options are accepted

• -Lc l specify maximum length l of elements.