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.

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.

Demonstrate a Transfer Path Analysis (TPA) on a simplified vehicle model using OptiStruct. TPA is used to calculate and rank the noise or vibration contributions for a given Response Point, through the different
structural transmission paths in a system.

Demonstrates how to identify sensitive design parameters within a full vehicle NVH model, both as a way to understand
the dynamics of the system and what design changes can be made to improve a vehicle response, using OptiStruct and NVH post-processing in HyperView.

Demonstrate Infinite Elements, which is effectively modeled to measure the sound pressure of the 2.1 Home Theater
System in OptiStruct with effective modeling practice.

Explicit Analysis of the impacting plates to extract the contact forces and performing Frequency Response Analysis
using these forces as input to study the sound radiation by the plates.

This section presents optimized topology examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used as a design concept tool.

This section presents size (parameter) optimization examples solved using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used in size 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.

The examples in this section demonstrate how topography optimization generates both bead reinforcements in stamped
plate structures and rib reinforcements for solid structures.

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.

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.

Explicit Analysis of the impacting plates to extract the contact forces and performing Frequency Response Analysis
using these forces as input to study the sound radiation by the plates.

OS-E: 0335 Measure Sound Radiation from Impacting Plates

Explicit Analysis of the impacting plates to extract the contact forces and
performing Frequency Response Analysis using these forces as input to study the sound
radiation by the plates.

Two plates (Figure 1) are meshed with first order CHEXA element.
Both the plates are constrained at one end in all DOFâ€™s and time dependent load is
applied on upper plate, which causes it to impact with the lower plate. Explicit
Analysis is performed for the setup and contact forces are requested as an
output.

The frequency response setup has a smooth acoustic mesh (in this case a cylinder with
hemispherical faces) around the impact plates. The ends of the acoustic mesh
(surface of the cylinder) have infinite elements. Perform the Frequency Response
Analysis to calibrate the sound radiated by the impacting plates at a distance of
1.5m and 2.5m (location of mic points).

Material Properties: Polycarbonate (Plates)

Young's modulus

1E+03 MPa

Poisson's ratio

0.4

Density

1E-09 ton/mm^{3}

Material Properties: Air (Acoustic Mesh)

Sound velocity

343000 mm/s

Density

1.2E-12 ton/mm^{3}

Contact Force Conversion (Time to Frequency Domain)

Contact forces obtained from explicit analysis are in time domain, to convert the
time domain results into frequency domain with help of Compose Script. These frequency dependent forces are fed as
an input for Frequency Response model where the sound radiation is checked, due to
this impact phenomenon.