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.

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.

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.

The model used is a simplified car model with an acoustic cavity. The model is already
setup for a modal frequency response run. The response point is the node which approximates
the location of the Driver Ear in the acoustic cavity. The source of excitation is a unit
load in the Global Z direction at the Engine Block. The Engine Block is connected to the
Body at 3 points using Engine Mounts modeled as
RBE2+CBUSH. To setup TPA, use the
PFPATH Bulk Data card and reference it using the
PFPATH I/O Option card.

FE Model

Element Types

CHEXA

CPENTA

CTETRA

CQUAD4

CTRIA3

CBUSH

CBAR

RBE2

The linear material properties are:

MAT1

For Steel

For Glass

For Seats

MAT10

For Acoustic Cavity

Results

The TPA utility in HyperView is used to post-process the
results. Using the utility, the Calculated Response given by Equation 1 is plotted against the Solver Response
for the Drive Ear Location. The Calculated Response should match up with Solver Response if
all the paths have been considered and the co-ordinate system used for Attachment Forces
output aligns with the co-ordinate system used for Transfer Function output.(1)

Transfer function, pressure at driver ear for a unit load for path
$i$

${F}_{i}$

Attachment force for path $i$

Now select the problem frequency, i.e. peak in the response, which may be over the target
level and find the top contributors to the response at that particular frequency.