[미국특허]
Systems and methods for predicting supersonic acoustic signatures
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G06F-017/40
G06F-017/00
출원번호
UP-0684923
(2007-03-12)
등록번호
US-7599805
(2009-10-20)
발명자
/ 주소
Pilon, Anthony R.
출원인 / 주소
Lockheed Martin Corporation
대리인 / 주소
Koestner Bertani LLP
인용정보
피인용 횟수 :
5인용 특허 :
4
초록▼
A system for determining an acoustic signature of a device is disclosed that includes a computer processor operable to determine strength and location of shock wave sound signals based on propagation of sound waves generated by the device. The strength and location of the shock wave signals are modi
A system for determining an acoustic signature of a device is disclosed that includes a computer processor operable to determine strength and location of shock wave sound signals based on propagation of sound waves generated by the device. The strength and location of the shock wave signals are modified due to dissipation and dispersion effects in a non-uniform atmosphere. The shock wave signals are separated into even and odd numbered signals, and oscillations in the signals are smoothed by averaging even and odd numbered shock signals.
대표청구항▼
What is claimed is: 1. A system for determining an acoustic signature of a device, comprising: a computer processor configured with logic instructions operable to: determine strength and location of shock waves in acoustic signals based on nonlinear propagation of sound generated by the device; mod
What is claimed is: 1. A system for determining an acoustic signature of a device, comprising: a computer processor configured with logic instructions operable to: determine strength and location of shock waves in acoustic signals based on nonlinear propagation of sound generated by the device; modify the strength and location of the shock waves due to dissipation and dispersion effects in a non-uniform atmosphere; separate the acoustic signals into even and odd numbered signals; and smooth oscillations in the signals by averaging the even and odd numbered signals. 2. The system according to claim 1 further comprising an input file specifying parameters including at least one of the group consisting of: atmospheric properties, a propagation increment along a ray tube, an azimuth increment, an altitude interval between atmospheric absorption applications, a ground surface type, a spectral analysis rate, a background noise spectrum, and transient maneuver rates. 3. The system according to claim 1 wherein the processor is further operable to determine a near-field static pressure signal for the device. 4. The system according to claim 1 wherein the processor is further operable to increment propagation segments from an altitude of the device to a ground location, and determine the acoustic signals along the propagation segments. 5. The system according to claim 1 wherein the processor is further operable to determine whether the acoustic signals are focused; and determine location and strength of the acoustic signals when the signals are focused. 6. The system according to claim 1 wherein the processor is further operable to determine a first shock wave signal that pertains to a distorted acoustic signal, and a second shock wave signal that is interpolated from the distorted acoustic signal and is used in dispersive calculations and spectral analysis. 7. The system according to claim 6 wherein the processor is further operable to transform the second shock wave signal from a time domain to a frequency domain, and adjust the second shock wave signal for atmospheric variations in the frequency domain. 8. The system according to claim 7 wherein the processor is further operable to apply background noise to the second shock wave signal. 9. The system according to claim 6 wherein the processor is further operable to adjust the second shock wave signal based on varied ground surface characteristics. 10. The system according to claim 1 wherein the processor is further operable to determine acoustic levels for specified azimuth angles around the device. 11. The system according to claim 1 wherein the processor is further operable to generate size and location of a carpet boom plot for the device. 12. A method for predicting the acoustic signature of a device, comprising: determining strength and location of shock sound signals based on propagation of acoustic signals generated by the device; modifying the strength and location of the acoustic signals due to dissipation and dispersion effects in a non-uniform atmosphere; and determining a first shock wave signal that pertains to a distorted acoustic signal, and a second shock wave signal that is interpolated from the distorted acoustic signal and used in dispersive calculations and spectral analysis. 13. The method according to claim 12 further comprising accessing an input file specifying parameters including at least one of the group consisting of: atmospheric properties, a propagation increment along a ray tube, an azimuth increment, an altitude interval between atmospheric absorption applications, a ground surface type, a spectral analysis rate, a background noise spectrum, and transient maneuver rates. 14. The method according to claim 12 further comprising determining a near-field static pressure signal for the device. 15. The method according to claim 12 further comprising incrementing propagation segments from an altitude of the device to a ground location, and determining the acoustic signals along the propagation segments. 16. The method according to claim 12 further comprising: determining whether the acoustic signals are focused; and determining location and strength of the acoustic signals when the acoustic signals are focused. 17. The method according to claim 12 further comprising: separating the shock wave signals into even and odd numbered signals; and smoothing oscillations in the shock wave signals by averaging even and odd numbered signals. 18. The method according to claim 17 further comprising transforming the second shock wave signal from a time domain to a frequency domain, and adjusting the second shock wave signal for atmospheric variations in the frequency domain. 19. The method according to claim 18 further comprising applying background noise to the second shock wave signal. 20. The method according to claim 12 further comprising adjusting the second shock wave signal based on varied ground surface characteristics. 21. The method according to claim 12 further comprising determining acoustic levels for specified azimuth angles around the device. 22. The method according to claim 12 further comprising generating size and location of a carpet boom plot for the device. 23. A computer program product comprising: logic instructions on computer readable media operable to cause a computer processor to: determine strength and location of shock waves in acoustic signals based on nonlinear propagation of sound generated by a device; and determine a first shock wave signal that pertains to a distorted acoustic signal, and a second shock wave signal that is interpolated from the distorted acoustic signal and is used in dispersive calculations and spectral analysis. 24. The product according to claim 23 further comprising an input file specifying parameters including at least one of the group consisting of: atmospheric properties, a propagation increment along a ray tube, an azimuth increment, an altitude interval between atmospheric absorption applications, a ground surface type, a spectral analysis rate, a background noise spectrum, and transient maneuver rates. 25. The product according to claim 23 wherein the logic instructions are further operable to increment propagation segments from an altitude of the device to a ground location, and determine the acoustic signals along the propagation segments. 26. The product according to claim 23 wherein the logic instructions are further operable to determine whether the acoustic signals are focused; and determine location and strength of the acoustic signals when the signals are focused. 27. The product according to claim 23 wherein the logic instructions are further operable to transform the second shock wave signal from a time domain to a frequency domain, and adjust the second shock wave signal for atmospheric variations in the frequency domain. 28. The product according to claim 23 wherein the logic instructions are further operable to perform at least one of the group consisting of: apply background noise to the second shock wave signal, adjust the second shock wave signal based on varied ground surface characteristics, determine acoustic levels for specified azimuth angles around the device, and generate size and location of a carpet boom plot for the device.
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