NASA Technical Reports Server NTRS 20140016707: Acoustics Research of Propulsion SystemsReportar como inadecuado



 NASA Technical Reports Server NTRS 20140016707: Acoustics Research of Propulsion Systems


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The liftoff phase induces high acoustic loading over a broad frequency range for a launch vehicle. These external acoustic environments are used in the prediction of the internal vibration responses of the vehicle and components. Present liftoff vehicle acoustic environment prediction methods utilize stationary data from previously conducted hold-down tests to generate 1-3 octave band Sound Pressure Level SPL spectra. In an effort to update the accuracy and quality of liftoff acoustic loading predictions, non-stationary flight data from the Ares I-X were processed in PC-Signal in two flight phases: simulated hold-down and liftoff. In conjunction, the Prediction of Acoustic Vehicle Environments PAVE program was developed in MATLAB to allow for efficient predictions of sound pressure levels SPLs as a function of station number along the vehicle using semi-empirical methods. This consisted of generating the Dimensionless Spectrum Function DSF and Dimensionless Source Location DSL curves from the Ares I-X flight data. These are then used in the MATLAB program to generate the 1-3 octave band SPL spectra. Concluding results show major differences in SPLs between the hold-down test data and the processed Ares I-X flight data making the Ares I-X flight data more practical for future vehicle acoustic environment predictions.



Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/







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