Vibro-Acoustic Temperature

Purpose of Tests

The vibro-acoustic/temperature procedure is performed to determine the synergistic effects of vibration, acoustic noise, and temperature on externally carried aircraft stores during captive carry flight. Such determination may be useful for, but not restricted to the following purposes:

a. To reveal and correct design weaknesses (Test, Analyze and Fix (TAAF) test).

b. To determine whether a design meets a specified reliability requirement (Reliability Demonstration test).

c. To reveal workmanship or component defects before a production unit leaves the place of assembly (Screening test).

d. To estimate the Mean Time Between Failure (MTBF) of a lot of units based upon the test item’s time to failure of a small sample of the units (Lot Acceptance test).

e. To determine the relative reliability among units based upon the test item’s time to failure of a small sample of the units (Source Comparison test).

Effects of the vibro-acoustic/temperature environment.

Possible effects of a combination of vibration, acoustic noise, and temperature include all effects that these factors can cause separately. In addition, increased stress as a result of moisture from thermal change may produce possible effects. The combined vibration, acoustic noise, and temperature environments may interact to produce effects that would not occur in any single environment or a lesser combination of environments