A new computational aeroacoustic model suitable for the prediction of turbulent airfoil trailing edge noise is presented. The method (known as the RANS based Statistical Noise Model or RSNM) combines numerically generated, mean turbulence information with a Green’s function for a semi-infinite half-plane to generate a far-field acoustic auto-spectrum. As a preliminary application of the method,...

A measurement technique with microphone array conventional beamforming for indoor linear cascade noise test is developing in NPU (Northwestern Polytechnical University of China) to quantify differences of sound source levels of linear cascade as a result of blade trailing edge modifications. The useful practical experience has been gained during this test. The special indoor microphones placeme...

Novel smart material and actuator technology will ultimately lead to the development of aerodynamically efficient air vehicles capable of radical shape change that can accomplish various mission types with superior performance. In this research, active skins based upon pressurized flexible matrix composites (FMCs) are investigated for trailing edge flap control of a glider wing. The new active ...

Presenting a masked prime leading a target influences the perceived onset of the masking target (perceptual latency priming; Scharlau & Neumann, in press). This priming effect is explained by the asynchronous updating model (Neumann, 1982; Scharlau & Neumann, in press): The prime initiates attentional allocation toward its location, which renders a trailing target at the same place consciously ...

Labriform locomotion, which is powered by oscillating the paired pectoral fins, varies along a continuum from rowing the fins back and forth to flapping the fins up and down. It has generally been assumed (i) that flapping is more mechanically efficient than rowing, a hypothesis confirmed by a recent simulation experiment, and (ii) that flapping should be associated with wing-shaped fins while ...

[1] We examine the differences between observed stratospheric vertical wave reflection and wave absorption events, which differ in that the wave-induced deceleration remains confined to upper levels in the former. The two types of events signify two types of stratospheric winter dynamics, associated with different downward coupling to the troposphere. Using time-lagged composites, we find that ...

Unusual single-pulse behaviour has been identified in two pulsars, B0919+06 and B1859+07. Both stars normally emit bright subpulses in a region near the trailing edge of their profile. However, they occasionally undergo ‘events’, whereby the emission longitude gradually decreases by about their profile width, remains in this position for typically several tens of pulses, and then gradually retu...