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Noise Source Evaluation of Misalignment and Elastomeric Couplings using Nearfield Acoustic Holography

Filyayev, Anton A
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535373234815763

Abstract Details

2017, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
This study concerns the effects of two different elastomeric (spider) coupling materials and their interaction with misalignment on the distribution and severity of noise sources in a custom-fabricated direct-drive dynamometer style rotating rig. The rig contained a motor, gearbox, alternator, electrical load, and mounting system. The test cases utilized buna-neoprene couplings and urethane couplings and a fixed amount of angular misalignment for each coupling material for a total of four cases. Using a 56-channel microphone array and the technique of patch Nearfield Acoustic Holography (NAH), the acoustic intensity field was decomposed using the measured pressure fields. The individual frequency-dependent noise sources of the rig were extensively analyzed in the form of colormap acoustic images and compared with a partial modal analysis test at 90 Hz, 670 Hz, 744 Hz, 1000 Hz, and 1282 Hz. It was found that the noise sources matched well with certain mode shapes of the rig and resulted in a few possible critical speeds. The third order was highly affected from adding the urethane coupling and induced misalignment, as well as being a critical speed. The addition of misalignment had a notable effect on amplifying individual noise sources with each respective coupling and occasionally adding additional sources. The effect of changing the spider coupling affected the position of many of the noise sources in the rig completely, resulting in a seemingly different system altogether. The input and output speeds of the rig were not very affected by the change in coupling material or misalignment.
Randall Allemang, Ph.D. (Committee Chair)
Susan Declercq, PhD (Committee Member)
Jay Kim, Ph.D. (Committee Member)
David L. Brown, Ph.D. (Committee Member)
84 p.
Mechanical Engineering
nearfield acoustic holography; misalignment; elastomeric couplings; fault detection; acoustics; microphone array

Recommended Citations

Citations

  • Filyayev, A. A. (2017). Noise Source Evaluation of Misalignment and Elastomeric Couplings using Nearfield Acoustic Holography [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535373234815763

    APA Style (7th edition)

  • Filyayev, Anton. Noise Source Evaluation of Misalignment and Elastomeric Couplings using Nearfield Acoustic Holography. 2017. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535373234815763.

    MLA Style (8th edition)

  • Filyayev, Anton. "Noise Source Evaluation of Misalignment and Elastomeric Couplings using Nearfield Acoustic Holography." Master's thesis, University of Cincinnati, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535373234815763

    Chicago Manual of Style (17th edition)

ucin1535373234815763
297
© 2017, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.