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up_min

• SolveMdreInit
• SolveExploop

Purpose

Utility function for model updating through MDRE expansion method.

Syntax

 up_min('SolveMdreInit',struct('cf',VC))
 up_min('SolveExploop',VC,RO)

Description

xxxgm

Theory

For expansion theory applied to parametrized models, see section 3.3.4

SolveMdreInit

All data needed to quickly compute and post-process the expansion with any design point are stored in an 'info','Expand' structure, stored in VC.Stack

• id : a def structure at sensors (thus using .tdof rather than .DOF field in general). Each id.def column gives a shape {y_Test(p)} the first column of id.data gives frequencies in Hz.
• Klab : name of model matrices (see section 6.5.1) parameters followed by Kdr and cQc to complete the matrices found in (3.16).
• K : The associated constant matrices
• cQo : Constant matrix to compute the right side of (3.16)
• idef : first column contains indices corresponding to field q_ex, second column to field R_D
• c : Observation of q_ex at sensors
• MVR : The reduced parametric model, contains the reduction basis to expand back to full DOFs
• v : switch between strategies
• oProp : used to specify ofact options.
• T : xxxeb
• MeasErr : remove?
• gamma : remove?
• gk : xxxeb
• k0 : xxx Is it useful? It does not correspond to kdr which moves
• ki : ?
• Kqe : ?
• Edit : ?
• zCphase : xxxeb
• cQ : remove ?
• toLabCell : ?
• UpCoef : In Expand ? It is a result
• iUpLoop : ?
• PlotFcn : ?
• cTol : ?
• lastGood : ?
• opts : ?

SolveExploop

This commands is used to compute expansion for a list of model design points.

Depending on the study, one either only wants to compute standard expansion result or more complex strategies (in the context of model updating using expansion for instance).

• The simplest case concerns the computation of standard expansion.

  To do that on only needs to provide a structure with fields

  • jw : indices of test shapes
  • lgamma : log values of γ
  • corresponding to each model parameter (if any) : model parameter values
• For more complex strategies, additional fields must be given :
  • DoFcn : function handle to the algorithm to use in SolveExpLoop
  • DoCfg : Additional option structure to forward to DoFcn

xxxExample with GARTEUR and ConstrainedLayer parameter : first use with standard expansion, then with optimization

Inside SolveExpLoop

See also

idopt, id_rm, iiplot, ufread