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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Define 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:
Alternatively, iterate from a user waveform.
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.
In VibrationVIEW, the user can modify a recorded field environment to meet or exceed a specified SRS. The result is a time waveform similar to the field environment and with the same frequency response function.
A modified user waveform based on an enveloped set of recordings maintains real-world characteristics and creates an SRS waveform that accurately reflects recorded events. Read more: Using Recorded Data to Improve SRS Test Development.
Originally designed to evaluate structural responses to an earthquake, the SRS is a valuable tool for testing environments with complex transient shocks. Engineers use an SRS test to evaluate a device’s response to a transient event likely to occur in the end environment.
An SRS vibration test generates more complex shock pulses than a classical shock test. To generate a specific SRS response, engineers often synthesize one of several standard synthetic waveforms such as burst random or WavSyn. Read more: Characteristics of SRS Waveforms.
The SRS can be used to:
The 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.
Unlike the fast Fourier transform (FFT), the SRS does not include time or phase information. Therefore, engineers cannot recreate the original pulse from an SRS. Additionally, acceleration pulses that differ in amplitude, frequency content, and duration can produce an equivalent shock spectrum, resulting in an extensive waveform selection process.
Still, SRS remains the most prominent tool for complex shock testing. The SRS technique straightforwardly characterizes a shock environment and can be defined with data from multiple shock events.
