A detailed study has been undertaken, using computer modeling, of the effect of changing the size of various parameters on the relative insertion loss afforded by a T profile top edge. It was found that the relative insertion loss afforded by a given T top configuration is a function of the location of the source, the barrier and the receiver and also the height of the barrier. The relative insertion loss varies systematically with changes in these parameters and this systematic variation could be incorporated into a prediction method. The relative insertion loss afforded by a reflective T-top is negligible, however, significant attenuation can be obtained with an absorptive top and this increases with increasing top width. A given T-top appears to perform better when located on a reflective barrier, however, this may be due to the T-top acting to nullify any benefit arising from adding absorption to the face of a simple barrier.
展开▼
