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Shock Response Spectrum - SRS

Mechanical shock pulses are often analyzed in terms of the shock response spectrum. The shock response spectrum assumes that the shock pulse is applied as a base input to an array of independent single-degree-of-freedom systems. SDOF system assumes that each system hat its own natural frequency.

High-speed video
High-speed video

Main Features

  • SELECTABLE FREQUENCY SPAN: define the calculation range for the frequency spectrum
  • FREQUENCY DIVISION (OCTAVE): define the resolution of the spectrum in the frequency domain
  • DAMPING/QUALITY FACTOR: select damping ratio or quality factor 
  •  OUTPUT CHANNELS:  composite/maximax, primary, residual
  • CALCULATED RESULTS: results in frequency domain spectrum can be shown as acceleration, velocity or displacement.​​​​​​​

Download Shock Response Spectrum Plugin | More about DEWESoft X3 software

SRS Model

The shock response spectrum is a calculated function based on the acceleration time history.

It applies an acceleration time history as an excitation to an array of single-degree-of-freedom (SDOF) systems. Each system is assumed to have no mass-loading effect on the base input.

Calculated Parameters

  • Velocity DC filter - removes the DC component of the calculated time signal
  • Remove DC offset - removes the DC component of the input time signal
  • Noise floor - calculate the noise floor of the input time signal
  • Frequency division (octave) - removes the DC component of the calculated time signal
  • Damping/quality factor - different damping factors produce different SRSs for the same shock waveform. Zero damping will produce a maximum response and very high damping produces a horizontal line

Output Channels

All the output channels are calculated for acceleration, velocity, and displacement.

  • Composite/maximax - composite shock response for the absolute maxima (absolute max, max, min)
  • Primary - forced response, computation during the shock (absolute max, max, min)
  • Residual - free vibration, computation after the shock (absolute max, max, min)

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