The proposed technology has strong potential for facilitating public acceptance of civil V/STOL aircraft and improving the survivability of military rotorcraft. Potential non-NASA applications include; (1) fast evaluation of acoustic impact of new rotary-wing concepts, (2) reduced noise rotary-wing aircraft design using real-time methods within optimization algorithms, (3) improved survivability of military aircraft through improved prediction of long range detection and stealth mission planning, (4) a new capability for pre-mission, stealth training within flight simulators, (5) a key technological step toward real-time cockpit monitoring of ground noise levels during flight, (6) improved land use and flight path planning by the FAA and commercial airports, (7) reduction in acoustic detectability of remotely operated aircraft used in surveillance missions, and (8) improved flight simulator training through realistic audio cues as requested by pilots for certain flight conditions (e.g. the onset of vortex ring state). The proposed effort directly responds to NASA's SBIR solicitation goal of developing validated physics-based multidisciplinary computational tools applicable for the design, analysis and optimization of rotorcraft in the area of acoustics. The solicitation also directly addresses NASA's goal of reducing noise levels at airports while increasing airport capacity. The computational tools proposed will enhance NASA's ability to conduct detailed assessments of candidate V/STOL concepts, design low noise flight trajectories, perform land use assessment and to evaluate the impact of noise control procedures on crew workload without a need for expensive flight tests. The tool will allow NASA to assess ground noise impact associated with new concepts, such as the current Heavy Lift and High Speed Rotorcraft concepts being studied.