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Shock Response Spectrum (SRS)

Meet or Exceed a Demand SRS Curve

The Shock Response Spectrum (SRS) software option adds SRS plots to VibrationVIEW’s Shock and Transient Capture test modes. Define the SRS parameters and synthesize a pulse to meet a specified curve. The software includes a variety of waveform synthesis generation techniques.

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Part number 9302

VR9302

SRS Test Development & Control

VibrationVIEW Shock Response Spectrum Test SettingsDefine the SRS test settings and synthesize the pulse to meet a specified curve. VibrationVIEW supports over 200 individual breakpoints, suitable for virtually any test specification.

Test generation techniques include:

  • Linear and exponential chirp
  • WavSyn
  • Burst random
  • Linear and exponential chirp on burst random
  • Enveloped random
  • Burst sine

Alternatively, iterate an SRS curve from a field-recorded time waveform.

SRS Synthesis

Synthesize a pulse to match a specified SRS curve. You can manually adjust the parameters of the underlying wavelets or allow VibrationVIEW to automatically create and run a test without intervention.

Shock Response Spectrum Test Settings screenshot

Additional Software Features

  • Enter individual tolerance bands for each frequency
  • Import frequency and amplitude breakpoints from a text file
  • Define parameters Te and TE for MIL-STD-810
  • Exceed SRS demand to meet or exceed specifications with a minus tolerance of 0%

Graphing Capabilities

  • SRS pseudo velocity and SRS acceleration plots
  • Acceleration for primary (+), primary (-), or maxi-maxi
  • IEEE-344 graphs
  • and more

Common Test Specifications

  • IEEE-344: procedure for seismic qualification of electrical equipment in nuclear power plants
  • AASME NQA-1: nuclear quality assurance requirements
  • Bellcore (Telcordia) GR-63: procedure and test level for seismic qualification of telecommunications equipment
  • QME-100: ASME standard; procedure for seismic qualification of mechanical equipment
  • AC-156: requires structures and equipment to maintain integrity despite earthquakes
  • ISO 4866.2010: measurement of vibration and evaluation of the effect on structures
  • ISO/TS 10811-1:2000: vibration and shock in buildings with sensitive equipment

Develop an SRS with Field-recorded Data

In VibrationVIEW, you can modify a field-recorded time waveform to meet or exceed a specified SRS curve. The resulting time waveform reflects the end-use environment and has the same frequency response function.

A waveform based on an enveloped set of field recordings maintains real-world characteristics and creates an SRS waveform that accurately reflects the real-world application. Read more: Using Recorded Data to Improve SRS Test Development.

What is the SRS?

The SRS is a method of testing components against complex transient shock events using a synthesized pulse. While designed to evaluate structural responses to earthquakes, engineers now use SRS tests to measure a component’s response to transient events likely to occur in the end-use environment in fields such as aerospace, defense, and seismic.

An SRS test generates more complex shock pulses than a classical shock test. Engineers often synthesize one of several standard synthetic waveforms, such as burst random or WavSyn, to develop a custom SRS response. Read more: Characteristics of SRS Waveforms.

Uses of SRS

  • Describe a transient event in general terms
  • Estimate the damage potential of a shock event
  • Design structure resonances
  • Define test specifications (particularly for seismic tests)
  • Replicate failure modes

Webinar

Fundamentals of Shock Response Spectra (SRS)

Fundamentals of VibrationVIEW - Shock Response Spectra (SRS) thumbnail

Fundamentals of VibrationVIEW - Shock Response Spectra (SRS)

How Does SRS Work?

SRS theoretical diagramThe SRS is a representation of time-domain data in the frequency domain. It models the original waveform’s response channels using a set of theoretical, single-degree-of-freedom (SDOF), mass-damper-spring oscillators. The SRS sequentially applies filters of increasing frequency to the time domain data and plots the characteristics of the filtered waveform.

The horizontal axis of the plot represents the natural frequency of each SDOF. The theoretical response of each SDOF is plotted on the vertical axis. It is important to note that the SRS is not the actual response of the device under test but a theoretical representation of the response.

Webinar

Common Issues in SRS Testing

Common Issues in SRS Testing thumbnail

Common Issues in SRS Testing

SRS Analysis

Analyze field data, develop spectra from recorded data, and compare the potential damage of test profiles in ObserVIEW.

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