SRS Analysis Transfer

A means to analyze the maximum response of a structure subjected to impact load in the frequency domain. Assuming the structure as a Single Degree of Freedom (SDOF) system with each of its natural frequencies. Outputting the maximum response in the time domain for each SDOF system defined by its respective natural frequency.

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Calculation Methods

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Direct Integration Method

Assume SDOF Equation of Motion (Standardized by Mass)
Transform Standardized Equation of Motion into a System of First-Order Equations
Substitute SDOF Natural Frequency and Damping
Perform Numerical Integration
Calculate Relative Displacement, Relative Velocity, Relative Acceleration, and Absolute Acceleration
Record Maximum Time-Domain Response for Each SDOF Natural Frequency

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Transfer Function Method

Assume SDOF Equation of Motion (Standardized by Mass)
Derive Transfer Function (Absolute Acceleration) using Laplace Transform
Substitute Angular Frequency, SDOF Natural Frequency, and Damping into the Transfer Function
Perform FFT on Input Acceleration Signal and Multiply by Transfer Function
Perform Inverse FFT to Extract Maximum Time-Domain Response
Record Maximum Time-Domain Response for Each SDOF Natural Frequency

How to Use it?

01

Select the damping value.

02

Select the Octave.

03

Select the pasting method based on the arrangement of time columns in your IERS data organized in Excel.
Example : [Time] [IERS 1] [IERS 2] [IERS 3] ...
Example : [Time] [IERS 1] [Time] [IERS 2] [Time] [IERS 3] ...
(Perform SRS analysis on multiple IERS datasets simultaneously)

04

Paste the RRS data. (Optional) RRS will be displayed on the graph as a red dotted line.

05

Paste the IERS data. The program will recognize and display the number of IERS data sets, Time step interval, and number of Time steps.

06

Click the “Run” button to perform the SRS analysis.

07

Click the “Copy to Clipboard” button to copy the calculated values, which can then be pasted into Excel.

08

Click the “Initialize” button to return the program to its initial state.