In API 650 Appendix E, a factor of 1.5 is used to adjust the spectral accelerations from 5% to 0.5% damping. No explanation is given why this is valid. What method may be used to establish the spectral acceleration at 0.5% damping given a response spectrum at 5% damping?
In API 650 Appendix E, what is the basis for using a factor of 1.5 for adjusting the spectral accelerations from 5% to 0.5% damping?
What other method may be used to establish the spectral acceleration at 0.5% damping given a response spectrum at 5% damping?
A vertical acceleration PSD of a diesel engine used as part of a generator shows a second harmonic peak with significantly more energy than the first harmonic. Given the mechanisms at work here is this possible?
If not where else should I look:
(a) that it coincides with a mode of the isolation...
