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Example Guide
The OptiStruct Example Guide is a collection of solved examples for various solution sequences and optimization types and provides you with examples of the real-world applications and capabilities of OptiStruct.
Shape Optimization
This section presents shape optimization example problems, solved using OptiStruct. Each example uses a problem description, execution procedures and results to demonstrate how OptiStruct is used in shape optimization.
OS-E: 2045 Response Spectrum Analysis (RSA) Optimization
This example demonstrates the capabilities of OptiStruct to perform shape optimization with Response Spectrum Analysis Displacement as response.

Welcome
What's New
View new features for OptiStruct 2024.1.
Overview
OptiStruct is a proven, modern structural solver with comprehensive, accurate and scalable solutions for linear and nonlinear analyses across statics and dynamics, vibrations, acoustics, fatigue, heat transfer, and multiphysics disciplines.
Tutorials
Discover OptiStruct functionality with interactive tutorials.
User Guide
This manual provides detailed information regarding the features, functionality, and simulation methods available in OptiStruct.
Reference Guide
This manual provides a detailed list and usage information regarding input entries, output entries, and parameters available in OptiStruct.
Example Guide
The OptiStruct Example Guide is a collection of solved examples for various solution sequences and optimization types and provides you with examples of the real-world applications and capabilities of OptiStruct.
- Nonlinear Small Displacement Analysis
  This section presents nonlinear small displacement analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Nonlinear Large Displacement Analysis
  This section presents nonlinear large displacement analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Nonlinear Transient Analysis
  This section presents nonlinear transient analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Frequency Response Analysis
- Normal Modes Analysis
  This section presents normal modes analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Complex Eigenvalue Analysis
  This section presents complex eigenvalue analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Thermal and Heat Transfer Analysis
  This section presents thermal and heat transfer analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Analysis Techniques
  This section presents analysis technique examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Topology Optimization
- Size (Parameter) Optimization
- Free-shape Optimization
- Shape Optimization
  This section presents shape optimization example problems, solved using OptiStruct. Each example uses a problem description, execution procedures and results to demonstrate how OptiStruct is used in shape optimization.
  - OS-E: 2000 Introductory Example
    Demonstrates how shape optimization can be used.
  - OS-E: 2005 Oil Pan using ERP Response
    Use equivalent radiated power (ERP) response to conduct a shape optimization of an oil pan cover by applying a specific excitation in frequency response analysis using OptiStruct.
  - OS-E: 2010 Dang Van Fatique (Factor of Safety) Optimization
    Used to predict if a component will fail in its entire load history. In certain physical systems, components may be required to last infinitely long.
  - OS-E: 2015 Shape and Size Optimization of a Plate in Bending
    Shape variables are used in this example to vary both the thickness and the shape of a plate constructed from solid elements. Topography optimization allows discrete areas of the plate to change thickness and/or height, providing a greater range of possible solutions than with shape or size optimization alone.
  - OS-E: 2020 Solid Control Arm
    Topography optimization has applications beyond creating beads in shell surfaces. Since the basic topography approach can be applied to any model containing large fields of shape variables, it lends itself to solid model applications.
  - OS-E: 2025 Stamped Hat Section
    Pattern grouping and shape variables can be used to optimize stamped plates that are difficult to deal with due to corners and sharp edges.
  - OS-E: 2030 Cantilever Beam Modeled with Solid Elements
    The purpose of this example is to minimize the volume of a prismatic cantilever beam.
  - OS-E: 2035 Stress and Strain Responses Based on the Neuber Correction Method
    The objective is to reduce the stress concentration at the fillet regions of the model by changing its shape.
  - OS-E: 2040 Contact Pressure Response
    This example highlights the OptiStruct capability to use nonlinear responses in optimization from version 2018 onwards.
  - OS-E: 2045 Response Spectrum Analysis (RSA) Optimization
    This example demonstrates the capabilities of OptiStruct to perform shape optimization with Response Spectrum Analysis Displacement as response.
- Topography Optimization
  The examples in this section demonstrate how topography optimization generates both bead reinforcements in stamped plate structures and rib reinforcements for solid structures.
- ESLM Optimization
  The examples in this section demonstrate how the Equivalent Static Load Method (ESLM) can be used for the optimization of flexible bodies in multibody systems.
- Multiphysics
  This section presents multiphysic examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Rotor Dynamics
- Response Spectrum
  This section presents response spectrum examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Nonlinear Explicit Analysis
  This section presents nonlinear explicit analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
- Piezoelectric Analysis
  This section presents piezoelectric analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
Verification Problems
This manual presents solved verification models including NAFEMS problems.
Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding OptiStruct.

OS-E: 2045 Response Spectrum Analysis (RSA) Optimization

This example demonstrates the capabilities of OptiStruct to perform shape optimization with Response Spectrum Analysis Displacement as response.

Model Files

Before you begin, copy the file(s) used in this example to your working directory.

RSAOpti.fem

Model Description

In this example a Response Spectrum Analysis is performed on a building structure and from this analysis, Response Spectrum Displacement Response is taken as the constrain for performing shape optimization of the building structure.

Objective: Minimize the mass
Constrains: Response Spectrum Displacement Constrain (RSDISP)
Design Variables: Shape Design Variables
Reference Guide Entries: DESOBJ, DESVAR, RSDISP, DCONSTR, DCONADD, RSPEC

Results