# SS-T: 4070 Random Response Analysis

Create random response analysis in SimSolid.

## Purpose

- Create dynamic random analysis for a walkway assembly with base excitation load.

## Model Description

- Random.ssp
- PSD_Function.csv

- Material is set to Steel for all parts.
- Regular connections with 3mm gap and penetration tolerance.

## Open Project

Open the SimSolid project file.

## Create Modal Analysis

## Create Immovable Support

Create immovable supports on select faces in the model.

## Run Analysis

Solve the analysis.

- In the Project Tree, open the Analysis Workbench.
- Click (Solve).

## Review Results

Plot displacement magnitude contour and review the modes.

## Create Random Response Analysis

Use modal results to create random response analysis.

## Create PSD Functions

Define power spectral density (PSD) vs frequency response.

## Define Loads

Define base excitation load.

## Run Analysis

Solve the analysis.

- In the Project Tree, open the Analysis Workbench.
- Click (Solve).

## Review Results

Plot displacement magnitude contour and review the modes.

## Plot Response Curve

Plot response vs frequency for a picked location and obtain partial response.