Keyword: Noise measurement

NASA Spinoff: Sensors/Data Acquisition
A NASA microphone that detects unseen air turbulence is lofted to high heights aboard a stratospheric glider.
Briefs: Medical
The app detects fluid behind the eardrum using a piece of paper and a smartphone’s microphone and speaker.
Briefs: Manufacturing & Prototyping
Applications include monitoring of earthquakes and tsunamis as well as manmade infrasonic sources such as boats.
Briefs: Software
High-Fidelity Sonic Boom Propagation Tool
The sBOOMTraj software tool predicts and mitigates ground noise generated during supersonic flight.
Briefs: Aerospace

Researchers at NASA's Armstrong Flight Research Center (AFRC) recently completed a study of the feasibility of aerial towing an unpiloted, sub-scale vehicle to supersonic flight conditions to examine...

Briefs: Mechanical & Fluid Systems
Program Computes Sound Pressures at Rocket Launches

Launch Vehicle External Sound Pressure is a computer program that predicts the ignition-overpressure and the acoustic pressure on the surfaces and in the vicinity of a rocket and launch pad during launch. The program generates a graphical user interface (GUI) that gathers input data from the...

Briefs: Mechanical & Fluid Systems

Wavy-planform rotor blades for helicopters have been investigated for the first time in an effort to reduce noise. Two of the main sources of helicopter noise are blade/vortex interaction (BVI)...

Briefs: Electronics & Computers

A processing system has been developed to meet increasing demands for detailed noise measurement of aircraft in wind tunnels. Phased arrays enable spatial and amplitude...