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rotor2d

• teig
• test
• BuildFrom2D

Purpose

The rotor2d function lets you build a superelement representation for rotor applications starting from a 2D model. A tutorial is given in section ??

teig

Needs description.

test

Simpledisk

BuildFrom2D

model=rotor2d('buildFrom2D',model2D); builds a 3D sector model by revolution of a 2D section. In the rotor module, the symmetry axis is always z so that if the 2D mesh is given in xy coordinates a permutation is performed.

• -nsec N number of sectors. By default, one considers 10 sectors, for a different value use buildFrom2D -nsec N.
• -div N number of divisions in each sector.

The sector is modeled as a superelement called disk1.

 % Model Initialization
 model2D=rotor2d('test simpledisk -back');
 cf=feplot(rotor2d('buildFrom2D',model2D));
 SE=cf.Stack{'disk1'}; % enforce boundary cond. on sector and assemble
 SE=fe_case(SE,'FixDof','Base','z==1.01');
 SE=stack_set(SE,'info','Omega',[0 0 0;0 0 1000]); % define speed range
 SE=fe_cyclic('assemble -se',SE);
 cf.Stack{'disk1'}=SE; fecom('view1');

 cf.Stack{'info','EigOpt'}=[5 20 0]; % define eigenvalue options
 RunOpt=struct('targ',1, ...      % define target diameter
    'Range',linspace(0,1,30));    % define speed points relative to range
 [cf.def,hist]=rotor2d('teig',cf,RunOpt);  
 figure(1);rotor2d('plot',hist);set(gca,'ylim',[0 250])