Statistical measurements of fast changing electromagnetic fields
The present works aims at describing important statistical indexes such as the field uniformity, the field inhomogeneity and the statistics near the cavity walls for a special case of fast changing random electromagnetic
fields. We generate this kind of electromagnetic environment by means of a vibrating intrinsic reverberation chamber. The use of several, fast, in-house, 3-axis field sensors allows for extensive, "real-time" measurements inside such a chamber.
Observation of maximal and average field values in a Reverberation chamber
The theoretical field strength values in reverberant environments can easily be approximated using the well-established models. In the near-average range of the distribution a very good agreement can be reached and is used in many applications. The estimation of the maximal field strengths is, however, difficult due to certain assumptions. The complexity of real reverberant cavities is too high for analytical and even numerical approach. This study focuses on the experimental way using a Vibrating Intrinsic Reverberation Chamber (VIRC). The randomness of movement of flexible walls of a VIRC is exploited by conducting long, 1 hour measurements to obtain many independent samples. Statistical analysis of the data is conducted to evaluate the maximal, average, and their ratio as functions of both number of samples and measurement time.
Prediction of net pressure on pressure equalized cavities
Abstract A numerical model has been developed for prediction of net pressure on pressure equalized cavities. The results based on this model show good agreement with those obtained from mock-up tests. Parametric studies verify that reductions in cladding load are possible, with proper design of curtain walls.