Advanced turboprop noise prediction based on recent theoretical results

development of a noise prediction model based on advanced fuzzy approaches in typical industrial workrooms

background: noise prediction is considered to be the best method for evaluating cost-preventative noise controls in industrial workrooms. one of the most important issues is the development of accurate models for analysis of the complex relationships among acoustic features affecting noise level in workrooms. in this study, advanced fuzzy approaches were employed to develop relatively accurate ...

Recent Theoretical and Experimental Results

We consider a wireless ad hoc network with single antenna nodes under a two-hop relay traffic pattern. Some of the nodes in the network form source/destination pairs, while the other nodes serve as amplify and forward relays. The relay gains are assigned such, that the interference between different source/destination links is nulled (multiuser zero forcing relaying; MU-ZFR). This essentially r...

Recent Theoretical Results on |∆i| = 3/2 Decays of Hyperons *

We present a discussion of the |∆I| = 3/2 amplitudes of the hyperon decays B → B ′ π in the context of chiral perturbation theory. We evaluate the theoretical uncertainty of the lowest-order predictions by calculating the leading non-analytic corrections. We find that the corrections to the lowest-order predictions are within the expectations of naive power-counting and, therefore, that this pi...

Some recent theoretical results on amorphous packings of hard spheres

Fly-over noise measurements and simulation for a turboprop aircraft

The study of aircraft noise started in earnest in the 1960s, however, the validation of comprehensive noise models for existing commercial aircraft using well-defined experimental data have since produced modest advances. Considerable focus appears to have been placed on aircraft conceptual design, with relatively little effort considering aircraft currently in use, for which we believe there i...