Vibration and Shock Mountings Type PD P5D, P7D& 8 14D PL0521 JUNE 2011 Rev. C Vibration& Shock Control available from the Ministry of Defence Ship's Department BR. 3021 Shock Manual. The optional VSU (Vertical Stop Unit) and resilient end restraints shown below left are used to limit the shock displacements and the response to shock levels will be through analysis and whole ship shock test done by the ship builder. Overreliance on generic shock specifications increases the risk of inadequate design.
Representation of Shock Specifications The shock requirement for shipboard equipment is most often specified as classical shock pulses or as a Shock Response Spectra (SRS). Apr 10, 2008 RE: Naval Shock Spec IRstuff (Aerospace) 10 Apr 08 18: 00 The numbering scheme doesn't match the DEF STAN scheme, so it's a British military standard, but not a DEF STAN.
A shock mounting system must fulfil the following functions: supporting the suspended mass when there is no shock while providing isolation from vibration and structure bourne noise; in case of shock: limit the force andor movement to acceptable values; after shock: return the suspended mass to Type PD One of a range of rubber shock and vibration mountings available from the Ministry of Defence Ship's Department BR.
3021 Shock Manual. The optional VSU Vertical Stop Unit (shown on the left with the red rubber shock washers) and resilient end restraint Rectangular Sandwich Mountings (shown on the right) are used to limit the shock displacements and the response to ship motion.
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