Shock, SRS and Pyroshock Testing

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    A shock is a sharp transfer of energy into a mechanical system to test the system’s capability to survive a drop, hit, impact, fall, explosion or any other source of transient vibration (3).

    Shocks are characterised by their short duration and high amplitude or energy content.

    Classical Pulses
    • Half sine, Sawtooth, Trapezoidal (1)etc.
    • Fairly simple, usually expressed in acceleration (g) and duration (ms).
    Complex Pulses – SRS, PVSS
    • Sine Wavelets, decaying sinusoids etc.
    Pyroshock – generally in an SRS spec
    • Derived from a detonation or external blast, can be simulated by a nailgun.
    Drop Testing
    • Freefall of test item from specific height and onto a specific surface.
    Impact Testing
    • Item is fixed and the shock device is an impactor that is dropped from a certain height (hammer, pendulum).

    Shock Response Spectrum (SRS) was specifically developed by the Defence & Space Industry as a better way of testing, specific to the shocks they might encounter such as booster rocket separation, explosions (3)etc.

    Shock Response Spectrum (SRS) is a calculated function based on an input transient.  It allows us to compare shocks with each other or to establish equivalence criterion between a measured transient environment and a laboratory simulation of that transient environment.

    All these intended shocks have the same characteristics as the required pulse in that they contain a high G level in a very short duration (a lot of energy rapidly transferred).

    Resonate Testing uses SRS testing to recreate a pulse that is technically equivalent to the initial test requirement in terms of damage potential to provide the same level of test assurance.

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