Dissertation > Excellent graduate degree dissertation topics show

The Application of Planar Near-filed Acoustical Holography in Noise Source Identification

Author: ZhengXu
Tutor: ZhangLin
School: Harbin Engineering University
Course: Environmental Engineering
Keywords: Planar near field acoustic holography k- space Green's function Sound source identifying Far-field prediction
CLC: TN26
Type: Master's thesis
Year: 2008
Downloads: 101
Quote: 2
Read: Download Dissertation

Abstract


The near-field acoustic holography is the acoustic study an extremely important method by the radiator near-field measurement of sound pressure data can be reconstructed and predicted the amount of acoustic sound field for the entire three-dimensional space . Not only in the near-field noise source identification , can also predict the far-field radiation of the sound source . This paper describes the basic principle of the near-field plane acoustic holography and its discrete method and means of achieving and focus on discrete k-space Green's function method in detail , various discrete method of error analysis . By Matlab software , the preparation of the calculation procedure of the planar near field acoustic holography and holographic reconstruction of a function of distance and the filtering window holographic reconstruction results using a variety of different k-space discrete Green's function method for obtaining simulation analysis . According to the basic principle of the NAH , design a preliminary experiment . In determining the emission frequency of the sound source , the various parameters used in the experiments , deduced structures outlet array test system , and the entire test system FBI . According to the preliminary results , the improved experimental conditions, to re - determine the experimental parameters and conducted experiments again . Finally , the experimental results were processed and analyzed . The experimental results show that , in the reconstructed distance range of design requirements , the planar near field acoustic holography technology can be more accurate restore sound field distribution of the noise source location and sound source surface reconstructed increasing the distance , the holographic reconstructed distinguish The rate has dropped .

Related Dissertations

  1. The Acoustic Fields Reconstruction Based on the Acoustic Radiation Modes and Its Application,TB535
  2. Fault Feature Extraction Technique Based on Patch Near-Field Acoustical Holography,TB535
  3. Fault Feature Extraction Technique Based on Patch Near-Field Acoustical Holography,TB533
  4. Numeric Simulation and Experimental Research of Sound Source Identification with Beamforming Method,TB533
  5. The Study on the Main Noise Source of Underwater Elastic Structure Based on Near-field Beamforming,O427.5
  6. Sound Quality Evaluation and Research on Properties of Noise and Vibration of Automotive Door Closing,U467.4
  7. Investigation on Acoustic Holography Technique for Main Sound Sources Identification of the Targets Near Water Surface,TB566
  8. The Application Research on Green’s Functions in Planar Near-field Acoustic Holography,TB52
  9. Research on the Technology of Noise Sources Identification of Beijing-Shanghai High-speed Railway,U270.16
  10. Reconstruction Techniques of Typical Sound Field Based on Green’s Functions,TB52
  11. Computer Generated Hologram Image Processing and Display System,TN26
  12. Study on Polarization Holography Image Storage in Azo-containing Polymers,TN26
  13. Two-Exposure Holographic Inteferometry Based on CCD/LCD Device,TN26
  14. Research of Digital Holographic Reconstruction and Record Based on CCD and EALCD,TN26
  15. Study on Phase Unwrapping in Topography Measurement with Digital Holography,TN26
  16. Research on the Quality of Reconstructed Image of Digital Holography,TN26
  17. Digital Holography and Its Application of displacement measurement,TN26
  18. Studies of Aperture Synthesis and Sub-hologram Combination Method in Digital Holography,TN26
  19. Design based on the transmission volume holographic grating wavelength division multiplexer,TN26
  20. Making Method of Color Reflection Hologram Based on Dichromated Gelatin,TN26

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Holography
© 2012 www.DissertationTopic.Net  Mobile