Correlation/Validation of Finite Element Code Analyses for Vibration Assessment of Avionic Equipment.

摘要

Avionics Environmental Reliability is a major issue for present and future military aircrafts. The printed wiring boards are getting more and more populated with electronic components because of very complex avionics requirements with limited space available in the avionic bay. With this limited available space, we are forced to design the printed wiring board with very densely populated electronic components. It appears that this kind of condition can create structural integrity problems for avionics in military aircrafts. It has been determined that vibration and thermal environments are major problems in military avionics, and these environments cause more than half avionics failures. There is a need to evaluate a design before we approve go ahead on production of these complex avionics boxes. WRDC/FIVE has started to develop a computer capability to predict avionics reliability prior to production, so that the design can be changed if it does not meet the Air Force requirements. WRDC/FIVE has selected/developed a finite element program which will allow avionics reliability prediction. The Numerically Integrated elements for System Analysis (NISA) software was selected to accomplish this task. In May 1984, the Environmental Control Branch (WRDC/FIVE) started In-House effort to validate vibration prediction using NISA and test data acquired from laboratory test, with similar boundary conditions. This report contains the results of validation of predictions by showing comparisons with test data. (kr)