Downloaded from https://www.everyspec.com MIL-STD-81OC NOTES 1. Raise computed Lo level by 3 dB for a store carried in a TER cluster rack; by 6’dB for a MER cluster rack. If calculated f. is above 2000 Hz use upper frequency limit of 2000 Hz. If calculated f. is below 200 Hz use 200 Hz. 3. Round off f. upwards to a one-third octave band center frequency. For stores which do not have circular cross-sections the radius used in the formulas shall be the radius of the circle which circumscribesthe cross-sectionof the store. 4. 5.
For locations on flat nose stores (80° ~ j3 S90° ) where XC 100 Functional test Lo = 20 Log (ql) - 6 Log (X) + 96 Endurance test Lo = 20 Log (q2) - 6 Log (X) + 96”+ 2.5 Log (N/3T) 6. For long cylindrical section,> 2D, use for locationsmore than one O aftward into the cylindrical section ) Functional test Lo = 20 Log (ql) + 84 Endurance test Lo = 20 Log (q2) + 84 + 2.5 Log (N/3T) 7. For changing radius section either aft of a long cylindrical section or when X > 100 on a flat nose store, redefine X so that X = 1 at beginning of this section Functional test Lo = 20 Log (ql) + 11 Log (X) + 84 Endurance test Lo = 20 Log (q2) + 11 Log (X) + 84 + 2.S Log (N/3T) 515.2-9 METHOD 515.2