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BESO for Shells
Bidirectional Evolutionary Structural Optimization for shell structures.
Inputs
| Name | ID | Description | Type |
|---|---|---|---|
| Model | Model | Model to be optimized | Model |
| Elem Ids | ElemIds | List of identifiers of shells that take part in cross section design. By default all are included. | Text |
| LCases | LCases | List of names of load-cases that are considered for BESO | Text |
| Target mass ratio | TargetRatio | Target Ratio of remaining mass to initial mass of all elements that take part in the BESO (also inactive elements count). | Number |
| MaxIter | MaxIter | Maximum number of iterations | Integer |
| ER | ER | Evolutionary volume ratio: V(k+1) = V(k)*(1+-ER). If ER<0 (the default) then ER is set to (1-TargetRatio)/MaxIter+ARmax/2. | Number |
| ARmax | ARmax | Ratio between maximum number of elements to be added per step and all elements. | Number |
| Nhist | Nhist | Number of iterations between the steps which are used for calculating the convergence criteria. | Integer |
| Conv | Conv | Relative change of the mass between two iterations Nhist cycles apart below which convergence is assumed. | Number |
| Rmin | Rmin | Radius of influence [m] for determining the element sensitivity. If Rmin<0 (the default) then Rmin is set to the characteristic element length which is calculated as (total Area/number of elements)^(0.5)*2. | Number |
| Rexp | Rexp | Exponent for weighting the distance from nodes to element centers for the calculation of sensitivities. | Number |
| KillThickFactor | KillThickFac | Factor for shell thickness used for soft kill of shell elements. | Number |
Outputs
| Name | ID | Description | Type |
|---|---|---|---|
| Optimized Model | Model | Model after BESO. | Model |
| ModelHistory | ModelHist | History of model-evolution | Model |
| CHistory | CHist | History of objective function values | Number |
| VHistory | VHist | History of volume values | Number |
| Info | Info | Information regarding the optimization process. | Text |
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