Primary vs Residual SRS
Concise reference to primary and residual shock response spectra and the engineering distinction between them.
Key definitions
- Primary SRS retains peaks occurring during the input record
- Residual SRS retains peaks occurring after the defined pulse/input ends
- The two can emphasise different oscillator frequencies depending on input duration
- Always document how the end of the excitation interval is defined
Core relationship
Primary ≠ residual; each is a peak over a different time window.
Use with care
Definitions and notation vary between organisations and standards. Confirm the controlled specification, response quantity, sign convention, damping and units before applying a formula or comparing datasets.