Shock Response Spectrum Synthesis and Control

Shock response spectrum (SRS) synthesis and control provides a valuable tool to evaluate the shock-worthiness of equipment. By creating a synthesised waveform that matches a user-specified SRS profile, the controller tests the shock damage resistance of equipment mounted on a shaker system.

Uses

• Simulating shock transient including pyrotechnic and earthquake waveforms
• Shock damage testing by matching a specified SRS profile
• Aerospace and space applications for explosive events
• Earthquake and seismic qualification tests
• Compliance to military and commercial standards

Features

• SRS profile breakpoint table with unlimited number of entries
• Sine beats or damped sine wavelets
• Automatic iterative creation of wavelets including frequencies, half-cycles, delay and amplitude
• Manual optimisation mode to edit wavelet table
• SRS types for maxi-max, positive maximum, or negative maximum
• SRS frequencies with octave spacing from 1/1 to 1/48
• Damping ratio from 0.1 to 99% (Q = 0.5 to 500)
• SRS control up to 20 kHz
• Sampling rates up to 102 kSPS with up to 65k data points (4096 points standard)
• Display of SRS spectra and time histories as acceleration, velocity, displacement

The software synthesises a waveform from sinusoidal components, or wavelets, from a table of sine beats or damped sine with a wavelet at each fractional octave frequency corresponding to the SRS profile. An iterative process adjusts the amplitudes, half-cycles, and relative delays of the wavelets until the synthesised pulse’s SRS matches the profile SRS to within the required accuracy.

The user creates an SRS profile by entering or importing a breakpoint table of frequencies and acceleration amplitudes, plus slopes if required. After specifying the Q factor (or damping) and the synthesis method as pyroshock, minimum acceleration, or user-defined duration, SRS automatically synthesises a waveform that matches the profile SRS.

SRS synthesis tests the damage potential for a shock vibration by matching a user-specified SRS target curve.