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BESOShellsolve Method

Perform bi-directional evolutionary structural optimization (BESO) on the shell elements of a model.

Namespace:  Karamba.Algorithms
Assembly:  KarambaCommon (in KarambaCommon.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax
public static void solve(
	Model in_model,
	List<string> elem_ids,
	int max_iter,
	double targ_a,
	double er,
	double ar_max,
	int n_hist,
	double conv,
	double rmin,
	double rexp,
	double kill_thick,
	List<int> load_case_inds,
	ref string info,
	out Model model,
	out List<Model> model_hist,
	out List<double> c_hist,
	out List<double> v_hist
)

Parameters

in_model
Type: Karamba.ModelsModel
Model to be BESOed
elem_ids
Type: System.Collections.GenericListString
"List of identifiers of shells that take part in cross section design. By default all are included.
max_iter
Type: SystemInt32
Maximum number of iterations
targ_a
Type: SystemDouble
Target Ratio of remaining are to initial area of all elements that take part in the BESO (also inactive elements count).
er
Type: SystemDouble
Evolutionary volume ratio: V(k+1) = V(k)*(1+-ER). If ER less than 0 (the default) then ER is set to (1-TargetRatio)/MaxIter+ARmax/2.
ar_max
Type: SystemDouble
Ratio between maximum number of elements to be added per step and all elements.
n_hist
Type: SystemInt32
Number of iterations between the steps which are used for calculating the convergence criteria.
conv
Type: SystemDouble
Relative change of the mass between two iterations Nhist cycles apart below which convergence is assumed.
rmin
Type: SystemDouble
Radius of influence [m] for determining the element sensitivity. If Rmin less than 0 (the default) then Rmin is set to the characteristic element length which is calculated as (total Area/number of elements)^(0.5)*2.
rexp
Type: SystemDouble
Exponent for weighting the distance from nodes to element centers for the calculation of sensitivities.
kill_thick
Type: SystemDouble
Shell thickness used for soft kill of shell elements.
load_case_inds
Type: System.Collections.GenericListInt32
List of load cases that are considered for BESO
info
Type: SystemString
Information regarding the optimization process.
model
Type: Karamba.ModelsModel
Optimized model
model_hist
Type: System.Collections.GenericListModel
History of model-evolution as a list of models
c_hist
Type: System.Collections.GenericListDouble
History of objective function values
v_hist
Type: System.Collections.GenericListDouble
History of volume values
See Also