Test Development in VibrationVIEW 2/3

Test Generation, Vibration Control

There are several modules in the Vibration Research software with the purpose of test development, specifically Fatigue Damage Spectrum (FDS), Shock Response Spectrum (SRS), and Sine Tone Acceleration and Generation (STAG). A user-defined test can be designed to meet specific requirements. Test development allows engineers to fine-tune a test for the most accurate results.

Developing a Shock Response Test

The shock response spectrum (SRS) is a tool for developing complex shock tests controlled in the SRS domain. Shock testing plays an integral part in determining the physical and functional performance of a product during and after a shock event. Shock events can range from small and anticipated transient shocks to large and unexpected seismic shocks.

SRS is used to define test specifications as well as analyze the test results. Many industries use SRS for development and testing; in some cases, the required response spectrum (RRS) is defined as part of the specifications for product qualification.

A classical shock test uses regular shock pulses of a prescribed acceleration controlled in the time domain. In comparison, SRS tests are controlled in the SRS domain, which is a frequency domain. The SRS is not a real response. Rather, it represents how a series of Single Degree of Freedom (SDOF) oscillators would respond independently to a transient event. An SRS displays the response of the series of SDOF oscillators in a graph.

SRS is most commonly used to analyze and control complex shock waveforms when the goal is for the maximax response of the system to meet or exceed a pre-defined SRS. VibrationVIEW uses wavelet control to manipulate the frequency and amplitude content of the complex time domain waveform. This ensures the control channel meets or exceeds the defined demand SRS, which is often called the Required Response Spectrum (RRS).

A test-specified SRS is developed using wavelet control. Wavelet controls use a reference waveform as a starting point and then use feedback control to fine-tune the waveform.

The SRS feature in VibrationVIEW includes a variety of waveform synthesis generation techniques. Manually adjust the parameters of the underlying wavelets or have VibrationVIEW automatically create and run without intervention.

Download a demo of the SRS software module and/or check out our Webinar about creating tests using SRS Fundamentals in VibrationVIEW.

To learn how to create an SRS test in VibrationVIEW, visit the webinar on the Fundamentals of Shock Response Spectra (SRS).

SRS Demo Software    SRS Fundamentals Webinar

Date

April 23, 2020

Author

Jade Vande Kamp

Category

Test Generation, Vibration Control

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