Software Products: SRS Software

Navcon's shock response spectrum software utilizes three basic calculation methods with some additional variations.

1. The Peak Acceleration Response over all time (both during and after the shock) is known as the MaxiMax shock spectrum.

2. The Peak Acceleration Response of the resonator, as a function of frequency, during the shock is know as the Primary or initial shock spectrum. 

3. The Peak Acceleration Response after the shock termination is known as the Residual shock spectrum.

For all methods the time history of the shock pulse is analyzed with single degree of freedom (SDOF) filters or resonators.  The SDOF filters are applied to the recorded shock pulse time history using a digital integration method.  The time history output from each of the SDOF filters is scanned for the primary, residual or the MaxiMax response spectrum for the respective center frequency.

The SRS computation generates the results for the following 7 SRS analysis methods:

1. MaxiMax          Peak Acceleration over all time

2. Max Primary    Maximum acceleration during initial shock

3. Max Residual   Maximum acceleration during residual shock

4. Min Primary     Minimum acceleration during initial shock

5. Min Residual    Minimum acceleration during residual shock

6. Max |Primary|    Absolute maximum acceleration during initial shock

7. Max |Residual|   Absolute maximum acceleration during residual shock

The Shock Response Spectrum (SRS) software is a MATLAB based software package but can be run as a stand alone executable program.   

The software features three main components: 

a)       Data import
b)       SRS computation
c)       Documentation of results

The following flow chart outlines the typical steps during a SRS application.

Input data file types:

• Time Capture Buffer - Agilent Technology  Standard Data File SDF file extension *.tim
• FFT Mode Time Record- Agilent Technology Standard Data File SDF file extension *.dat
• DAC Express – Agilent Technology Data File *.sdf
• Other Interfaces - ASCII, MATLAB, UFF or virtually any digitized time data format
   

	After completing the data import the time record data is displayed. (Please click on image to expand.)
	The time data can be cropped to focus the analysis on discrete events. (Please click on image to expand.)
	The software computes the SRS based on the following parameters (Octave Band, 1/3 Octave Band, linear narrow band spectral lines or log spectral lines).  The user also specifies the starting and ending frequency range.
	Default Calculation: MaxiMax Results - Peak Acceleration over all time (Please click on image to expand.)