Two computer programs help analyst meet low-noise limits on turbofan engines. Microphone Location Program computes optimum locations in turbofan duct for placement of microphones. After tests in first program are run, acoustic phase, amplitude, and pressure are used as inputs in Modal Calculation Program.
Fan noise-mode structure in a duct
NASA Tech Briefs ; 4 , 3
1980-04-01
Miscellaneous
No indication
English