Prediction of vibration energy flow variability in random built-up structures
Sonjoy Das and C. S. Manohar
Proceedings of the 74th Shock and Vibration Symposium, San Diego, CA, 2003
The problem of characterizing stochastic variability in energy flow characteristics predicted using Vibration Energy Flow (VEF) analysis combined with Monte Carlo Simulation (MCS) technique is considered. This method provides a feasible framework within which investigation on scope of the assumptions made in traditional Statistical Energy Analysis (SEA) could be examined. The premise of the present study is that the application of the SEA procedure to a given problem can be considered to be successful if the sample fluctuations in subsystem energy levels do not differ from the predicted averages by a prescribed amount. A new approach by employing theory of structural reliability has been proposed in this paper in place of computationally intensive MCS technique. Accordingly, using the standard first order reliability method, the notion of a reliability index, that qualifies successful performance of SEA procedure, is introduced.
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