NISA/OPT
OPTIMUM STRUCTURAL DESIGN
NISAOPT is the most sophisticated family of
computer programs available in the world for
optimum structural design. The three programs in
the NISAOPT family: STROPT, SHAPE, and SECOPT,
are fully integrated with NISA II and DISPLAY III/IV.
State-of-the-art methods are utilized at initial
design, intermediate design, and optimum (final)
design. Design sensitivity coefficients are also
available.
STROPT
- Minimization of material volume, mass, and weight for
fixed geometry by changing thickness of shell, layer
orientation angles and thickness of composite laminate
and cross sectional dimensions of Beams/Bars
- Capabilities include:
- Optimum design for multiple load cases and
associated boundary conditions
- Various optimization algorithms and design sensitivity
analysis methods
- Standard cross sections as well as generalized beam
section
- Design Sensitivity Coefficient (DSC) vs. Design
variable number
- Constraints include: Displacement; normal, shear,
principal, von Mises, octahedral, node & Gauss point
stresses, AISC code; failure criteria; buckling load
factor; natural frequency; amplitude under harmonic
excitation
- Virtually no limits on the number of design variables and
constraints
SHAPE
- Optimization of structural shapes fully based on initial
finite element model, thus no need to model boundary by
parametric curve
- Minimization of mass, volume, or material cost
- Constraints include: stress and displacement under
multiple load cases and stiffness at nodes
- Any symmetry condition can be fully exploited in
modeling
- Driving of the solution towards global optimum
- Entire shape of prescribed regions may be subjected to
design variation
- The program may form and expand new holes and cutouts
within the system
- DSC contour plots
- The only commercially available program that allows
removal of material for optimum shape by removing
elements from both within the model and from the
boundaries of the structure
SECOPT
- Beam cross-section optimization of any prescribed
general shape, including single or multiple connected
cells
- Design variables can be thickness and side length
- Constraints can be imposed on section properties;
and on requirements from design code and other
considerations
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NISA/OPT