Real-Time Estimation of Jet-Surface Interaction Noise

Nonlinear interaction model of subsonic jet noise.

Noise generation in a subsonic round jet is studied by a simplified model, in which nonlinear interactions of spatially evolving instability modes lead to the radiation of sound. The spatial mode evolution is computed using linear parabolized stability equations. Nonlinear interactions are found on a mode-by-mode basis and the sound radiation characteristics are determined by solution of the Li...

Noise Modeling and a Prefiltering Approach for Real-Time Estimation of Signal-Dependent Quantum Noise

MARC HENSEL Hamburg University of Technology Institute for Vision Systems Harburger Schloßstraße 2

On broadband jet-ring interaction noise and aerofoil turbulence-interaction noise predictions

The aerodynamic noise of a thin rigid annulus (referred to as the ring here) placed in the mixing layer of a subsonic circular jet is investigated in the paper, both theoretically and experimentally. From the experimental point of view, the jet–ring configuration is understood as an axisymmetric alternative to more usual ones involving a rectangular aerofoil held between parallel side plates, d...

Real Time Calibration of Strap-down Three-Axis-Magnetometer for Attitude Estimation

Three-axis-magnetometers (TAMs) are widely utilized as a key component of attitude determination subsystems and as such are considered the corner stone of navigation for low Earth orbiting (LEO) space systems. Precise geomagnetic-based navigation demands accurate calibration of the magnetometers. In this regard, a complete online calibration process of TAM is developed in the current research t...

Real-time implementation of acoustic noise suppression