Environmental factor calculation for isolation mount system

[jhuynh]

Hi,
I am looking for a way to convert MTBF for a hard mounted system from the navy shelter Ns to an isolation mount system in the same navy shelter. Is there such method or conversion factor for that?
This mainly is a change in shock and vibration environment. The isolation mount system should be able to absorb more shock and vibration than the hard mount system, therefore it should experiences less severe environment. I just don't know how to quantify this.
Thanks,

[smorris]

There are ways to convert from one broad environmental category to another using relationships published in MIL-HDBK-217 and the Rome Laboratory Reliability Engineer's Toolkit (available from http://quanterion.com/Publications/Toolkit/index.asp); however, I know of no quick and easy way to split these relationships into a finer granularity (i.e., address shock mount versus non-shock mount within a given environment). The data gathered to support the existing relationships was not specific enough to support this level of granularity.