HyperWorks Solvers

Features

»Click here to display Table of Contents« OptiStruct > User's Guide > Overview:

Features
Features

•	Structural Analysis

-	Linear Static Analysis

-	Linear Buckling Analysis

-	Small Displacement Nonlinear Analysis

-	Large Displacement Nonlinear Static Analysis

-	Geometric Nonlinear Analysis (RADIOSS Integration)

-	Normal Modes Analysis

-	Frequency Response Analysis

-	Complex Eigenvalue Analysis

-	Random Response Analysis

-	Response Spectrum Analysis

-	Transient Response Analysis

•	Thermal Analysis

-	Linear Steady-State Heat Transfer Analysis

-	Linear Transient Heat Transfer Analysis

-	Nonlinear Steady-State Heat Transfer Analysis

-	Contact-based Thermal Analysis

•	Acoustic Analysis

-	Coupled Frequency Response Analysis of Fluid-Structure Models

-	Radiated Sound Analysis

•	Fatigue Analysis

-	Stress-Life method

-	Strain-Life method

•	Rotor Dynamics

•	Fast equation solver

-	Sparse matrix solver

-	Iterative PCG solver

-	Lanczos eigensolver

-	SMP parallelization

-	SPMD parallelization

-	DMIG input

-	AMLS Interface

-	FastFRS Interface

•	Advanced element formulations

-	Triangular, quadrilateral, first and second order shells

-	Laminated shells

-	Hexahedron, pyramid, tetrahedron first and second order solids

-	Bar, beam, bushing, and rod elements

-	Spring, mass, and damping scalar elements

-	Mesh independent gap and weld elements

-	Rigid elements

-	Concentrated and non-structural mass

-	Direct matrix input

•	Geometric element quality check

•	Local coordinate systems

•	Multi-point constraints

•	Contact, tie interfaces

•	Prestressed analysis

•	Linear-elastic materials

-

Isotropic

-	Anisotropic

-	Orthotropic

•	Nonlinear materials

-	Elastoplastic

-	Hyperelastic

-	Viscoelastic

•	Material consistency checks

•	Ground check for unintentionally constrained rigid body modes.

•	Parts and Instances

•	Subcase Specific Modeling

•	Direct Matrix Input (Superelements)

-	Direct Matrix Input

-	Creating Superelements

-	Component Dynamic Analysis

•	Flexible Body Generation

•	Poroelastic Materials

•	Solution sequences

-	Kinematics

-

Dynamics

-

Static

-	Quasi-static

-	Linearization

•

Bodies

-

Rigid

-

Flexible

-	Flexible body generation in using the CMS modeling technique, integrated with multi-body analysis if the model is set up in OptiStruct.

•	Constraints (between any body, flexible, or rigid)

-	Joints: Ball (spherical), free, fixed, revolute, translational, cylindrical, universal, planar, at-point, in-plane, parallel-axes, orient, perpendicular-axes, constant velocity, and in-line.

-

Gear

-

Couplers

-	Higher-pair joints: point-to-curve, point-to-surface, curve-to-curve, curve-to-surface, and surface-to-surface constraints.

•

Loads

-

Forces

-

Gravity

-	Motions (Joint and Marker)

-	Initial velocities (Body and Joint)

•	Function Expressions

•	General optimization problem formulation for all optimization types

-	Response based

-	Equation utility

-	Interface to external user-defined routines

-	Minmax (maxmin) problems

-	System identification

-	Continuous and discrete design variables

•	Solution sequences for optimization

-	Linear static

-	Normal modes

-	Linear buckling

-	Quasi-static nonlinear (gap/contact)

-	Frequency response (modal method with residual vectors)

-	Acoustic response

-	Random response

-	Linear steady-state heat transfer

-	Coupled thermo-mechanical

-	Multi-body dynamics

-

Fatigue

•	Responses for optimization

-	All optimization types:

-	Compliance

-

Frequency

-	Compliance index

-

Volume

-

Mass

-	Volume fraction

-	Mass fraction

-	Center of gravity

-	Moments of inertia

-	Displacement

-

Velocity

-	Acceleration

-	Temperature

-

Pressure

-

Stress

-	Buckling factor (with limitations in topology/free-size optimization)

-	Fatigue life/damage

-	User-defined responses

-	Size, shape, free-shape, and topography optimization: (In problems with topology/free-size design domains, these responses can be used in the non-design domain)

-

Strain

-

Force

-	Composite stress, strain, and failure (linear static analysis only)

•	Automatic selection of best optimization algorithm

-	Optimality criteria method

-	Convex approximation method

-	Method of feasible directions

-	Sequential quadratic programming

-	Advanced approximations

•	Automatic selection of best method for design sensitivity analysis

-	Direct method

-	Adjoint variable method

•	Topology, free-size, topography, size, shape, and free-shape optimization problems can be solved simultaneously

•	Multi-disciplinary optimization using combinations of the supported solution sequences

•	Mode tracking

•	Generalized optimization problem formulation

•	Multiple load cases with different solution sequences in combination

•	Global von Mises stress constraint for static loads

•	Density method

•	1D, 2D, and 3D elements in the design space

•	Non-design space can contain any element type and response

•	Extensive manufacturing control:

-	Minimum member size control to avoid mesh dependent results

-	Maximum member size control to avoid large material concentrations

-	Draw direction constraints

-	Extrusion constraints

-	Pattern grouping

-	Pattern repetition

-	Multiple symmetry planes

•	Checkerboard control

•	Discreteness control

•	Smoothing and geometry generation for 3D results

•	Generalized optimization problem formulation

•	Multiple load cases with different solution sequences in combination

•	Global von Mises stress constraint for static loads

•	Shell element thickness and composite ply-thickness design variables

•	Non-design space can contain any element type and response

•	Extensive manufacturing control:

-	Minimum member size control to avoid mesh dependent results

-	Maximum member size control to avoid large material concentrations

-	Draw direction constraints

-	Extrusion constraints

-	Pattern grouping

-	Pattern repetition

-	Multiple symmetry planes

•	Shape optimization for shells with automated design variable definition

•	Easy set up with one DTPG card

•	Extensive bead pattern control to allow for manufacturing constraints

-	Pattern grouping

-	Pattern repetition

-	Multiple symmetry planes

-	Discreteness control

•	Shell, rod, and beam properties can be designed

•	Spring and concentrated mass properties can be designed

•	Composite ply thickness and ply angle can be designed

•	Material properties can be designed

•	Continuous and discrete design variables

•	Perturbation vector approach

•	Shape functions are defined through DVGRID cards

•	Continuous and discrete design variables

•	Perturbation vector approach

•	Automatic generation of perturbation vectors

•	Reduction of stress concentrations

•	Equivalent Static Load (ESL) method

•	Size, shape, free-shape, topology, topography, free-size, and material optimization of flexible bodies in multi-body dynamics systems

•	Generalized optimization problem definition

•	Large number of design variables and constraints

•	Fully supported in HyperMesh and MotionView

•	Nastran type input format

•

HyperView

-	Direct output of H3D format for model and results

-	Direct output for iteration history

-	Export of iso-density surface in STL format

•	HyperGraph

-	Iteration history graphs

-	Sensitivity bar charts

-	Complex frequency response displacement, velocity, and acceleration plots for up to 500 nodes

-	Random response PSD and auto/cross correlation of displacement, velocity, and acceleration

-	Transient response displacement, velocity, and acceleration time history plots for up to 500 nodes

-	Bar chart for effective mass

•	HTML report

-	Model summary

-	Model and result displayed using HyperView Player

•

HyperMesh

-	Direct binary result file output

•	Microsoft Excel

-	Design sensitivities for size and shape variable approximations

•	Support of Nastran Punch and OP2 output formats

See Also: