Similar words: holography, holograph, holographic, cholangiography, cholecystography, holographic storage, ichnography, intravenous pyelography.
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1. The current near field acoustic holography techniques are all based on the measurement of the pressure.
2. The results demonstrated that near-field acoustic holography and underwater near-field measurement method based on the vector array is applicable and powerful.
3. Acoustic holography has attained a high lateral resolution but a poor axial resolution.
4. Based on the basic theory of Acoustic Holography in axis-symmetric sound field, a theoretical model of fast reconstructing reflection coefficients is built in this thesis.
5. The principle of WSA based acoustic holography is easier to understand, and it is more amiable to implement on the computer.
6. Acoustic holography is an effective method to analysis noise fields.
7. According to the principle of near-field acoustic holography (NAH), the system of data acquisition and analysis needed in holographic experiments have been constructed.
8. The acoustic holography technique for sound source identification and position by the method of continuously scanning improves the previous acoustic holography experiment.
9. The distributed source boundary point method(DSBPM) based nearfield acoustic holography(NAH) is used for identifying and localizing noise sources of the roots vacuum pump.
10. The distributed source boundary point method based nearfield acoustic holography is used for identifying and localizing noise sources of the roots vacuum pump.
11. The study on the holographic reconstruction and prediction of a semi-free field is valuable for the practical applications of the acoustic holography technique.
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12. Since the DSBPM is used to realize the nearfield acoustic holography, the calculation speed, the calculation precision, and the calculation stability of the reconstruction and prediction are improved.
13. This paper introduces the common methods in identifying vehicle noise, and gives a introduction of the method of acoustic holography which has been extensively applied now.
14. Sound field separation technique has been proposed, which overcomes the limitation on applications of near_field acoustic holography (NAH).
15. Numerical simulation shows that the method can enhance the resolution of the nearfield acoustic holography image efficiently.
16. Therefore, there are no problems such as parameters interpolation, singular integration etc. in WSA based acoustic holography, which are inherent to BEM based NAH.
17. The exterior noise of a truck was analyzed and predicted with the nearfield acoustic holography and the space transformation of sound field.
18. A method based on wave superposition approach is proposed for enhancing the spatial resolution of the nearfield acoustic holography.
19. The acoustic field separation technique of the statistically optimal cylindrical nearfield acoustic holography has also been developed.
20. A new method based on interpolation using orthogonal spherical wave source was proposed to enhance the resolution of the nearfield acoustic holography image without adding measurement points.
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