Field flutter

To describe the magnetic field variation, the field flutter /is defined by... 

Instead of the numerical factor 4.0 in Equation 7.10, hydrodynamic theory predicts a factor near 6.0 for the effective boundary layer thickness adjacent to a flat plate (both numbers increase about 3% per 10°C Schlichting and Gersten, 2003). However, wind tunnel measurements under an appropriate turbulence intensity, as well as field measurements, indicate that 4.0 is more suitable for leaves. This divergence from theory relates to the relatively small size of leaves, their irregular shape, leaf curl, leaf flutter, and, most important, the high turbulence intensity under field conditions. Moreover, the dependency of 6bl on /° 5, which applies to large flat surfaces, does... 

The reasons why a structure, under certain conditions, can flutter (vibrate) with values exceeding those allowed mainly results from alterations to the original configuration of the structure. In particular, since the technology level in the field of telecommunications is constantly developing, there is the need for the providers to continuously adjust the devices located on the structure this very often causes an increase in the loads on the structure and, thus, a loss of stiffness. This loss is considered to be responsible for the increase of vibrations experienced by the structure. 

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