Features

Finite Element Analysis

  • Structural Analysis
    • Linear Static Analysis
    • Linear Buckling Analysis
    • Small Displacement Nonlinear Analysis
    • Large Displacement Nonlinear Static Analysis
    • Normal Modes Analysis
    • Frequency Response Analysis
    • Complex Eigenvalue Analysis
    • Random Response Analysis
    • Response Spectrum Analysis
    • Transient Response Analysis (linear and nonlinear)
  • 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
    • Uniaxial Fatigue (SN and EN)
    • Multiaxial Fatigue (SN and EN, Dang Van Criteria)
    • Weld Fatigue
    • Seam Weld Fatigue
    • Vibration Fatigue (Transient, Sine Sweep, Random Response)
  • Rotor Dynamics
  • Fast equation solver
    • Sparse matrix solver
    • Iterative PCG solver
    • Lanczos and AMSES eigensolver
    • SMP parallelization
    • SPMD parallelization (Load Decomposition and Domain Decomposition Method)
    • Fast Modal Solution Solver for Modal Frequency Response (PARAM,FASTFR)
    • DMIG input
    • AMLS interface
    • FastFRS interface
    • GPU support
  • Advanced element formulations
    • Triangular, quadrilateral, first and second order shells
    • Axisymmetry
    • Laminated shells
    • Continuum 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
    • Joint
    • 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
    • Gasket
  • User-defined material
  • Material consistency checks
  • Ground check for unintentionally constrained rigid body modes.

Modeling Techniques

  • Parts and Instances
  • Subcase Specific Modeling
  • Local - Global (Zooming)
  • Model Change (Contact and elements) for Nonlinear Analysis
  • Direct Matrix Input (Superelements)
    • Direct Matrix Input
    • Creating Superelements
    • Component Dynamic Analysis
  • Flexible Body Generation
  • Poroelastic Materials

Multibody Dynamics

  • Solution sequences
    • Kinematics
    • Dynamics
    • Static
    • Quasi-static
    • Linearization
  • Bodies
    • Rigid
    • Flexible
    • Flexible body generation in using the CMS modeling technique, integrated with multibody 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

Optimization

  • 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)
    • Acoustic response
    • Random response
    • Linear steady-state heat transfer
    • Coupled thermo-mechanical
    • Multibody 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/Strain
      • Composite Stress/Strain/Failure
      • Force
      • Factor and Marge of safety
      • Buckling factor (with limitations in topology/free-size optimization)
      • Fatigue life/damage
      • Grid Point Force
      • Resultant Force
      • Bore Distortion Response
      • Contact force/pressure
      • Gasket pressure
      • Solid corner and grid point stress
      • Response spectrum displacement and stress
      • Stress/Strain based on Neuber correction
      • Equation Response (DRESP2)
      • User-defined Responses (DRESP3)
  • Automatic selection of best optimization algorithm
    • Convex approximation method (DUAL, DUAL2)
    • Method of feasible directions (MFD)
    • Sequential quadratic programming (SQP)
    • BIGOPT
  • 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
  • Mode Identification using Frequency Response subcase
  • Multiple Models Optimization (MMO)
  • Global Search Option
  • Mode tracking
  • Failsafe Topology Optimization
  • Reliability-based Design Optimization
  • Multiple Material Topology Optimization
  • Topology Lattice Optimization

Topology Optimization

  • Generalized optimization problem formulation
  • Multiple load cases with different solution sequences in combination
  • Stress/Strain responses in Topology design space for static and frequency response
  • 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

Free-Size Optimization

  • Generalized optimization problem formulation
  • Multiple load cases with different solution sequences in combination
  • Stress/Strain and the composite stress/strain responses in free-size design space for static and frequency response
  • 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
    • Pattern grouping
    • Pattern repetition
    • Multiple symmetry planes
  • Manufacturing Constraints for Composites

Topography Optimization

  • 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
    • Maximum bead width control
  • Direct launch of OSSmooth from Topography job

Size (Parameter) Optimization

  • 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
  • Manufacturing Constraints for Composites

Shape Optimization

  • Perturbation vector approach
  • Shape functions are defined through DVGRID cards
  • Continuous and discrete design variables
  • Remeshing option using HyperMesh

Free-shape Optimization

  • Perturbation vector approach
  • Automatic generation of perturbation vectors
  • Reduction of stress concentrations
  • Manufacturing constraints
  • Remeshing option using HyperMesh

Structural Optimization in Multibody Dynamics Systems

  • Equivalent Static Load (ESL) method
  • Size, shape, free-shape, topology, topography, free-size, and material optimization of flexible bodies in multibody dynamics systems
  • Generalized optimization problem definition
  • Large number of design variables and constraints

Pre-process

  • Fully supported in HyperMesh, SimLab and MotionView
  • Nastran type input format

Post-process

  • 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
    • Random response PSD and auto/cross correlation of displacement, velocity, and acceleration
    • Transient response displacement, velocity, and acceleration time history plots
    • Bar chart for effective mass
  • HTML report
    • Model summary
    • Model and result displayed using HyperView Player
  • HyperMesh
    • Direct binary result file output
  • SimLab
  • Microsoft Excel
    • Design sensitivities for size and shape variable approximations
  • Support of Nastran Punch and OP2 output formats