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You searched for subject:(Partition Noise). Showing records 1 – 2 of 2 total matches.

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University of Alabama

1. Kavanaugh, Joshua Stephen. Dynamics of vacuum-sealed, double-leaf partitions.

Degree: 2015, University of Alabama

The goal of this research is to investigate the feasibility and potential effectiveness of using vacuum-sealed, double-leaf partitions for applications in noise control. Substantial work has been done previously on double-leaf partitions where the acoustics of the inner chamber and mechanical vibrations of structural supports are passively and actively controlled. The work presented here is unique in that the proposed system aims to eliminate the need for active acoustic control of transmitted acoustic energy by removing all the air between the two panels of the double partition. Therefore, the only remaining energy paths would be along the boundary and at the points where there are intermediate structural supports connecting the two panels. The eventual goal of the research is to develop a high-loss double-leaf partition that simplifies active control by removing the need for control of the air cavity and channeling all the energy into discrete structural paths. The work presented here is a first step towards the goal of designing a high-loss, actively-controlled double-leaf partition with an air-evacuated inner chamber. One experiment is conducted to investigate the effects of various levels of vacuum on the response of a double-leaf partition whose panels are mechanically coupled only at the boundary. Another experiment is conducted which investigates the effect of changing the stiffness of an intermediate support coupling the two panels of a double-leaf partition in which a vacuum has been applied to the inner cavity. The available equipment was able to maintain a 99% vacuum between the panels. Both experiments are accompanied by analytical models used to investigate the importance of various dynamic parameters. Results show that the vacuum-sealed system shows some potential for increased transmission loss, primarily by the changing the natural frequencies of the double-leaf partition. (Published By University of Alabama Libraries) Advisors/Committee Members: Shepard, William S., Mahmoodi, Seyed N., Hubner, James P., University of Alabama. Dept. of Mechanical Engineering.

Subjects/Keywords: Electronic Thesis or Dissertation;  – thesis; Mechanical engineering; Acoustics; Virology; acoustics; double-leaf partition; noise control; passive control; vacuum

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kavanaugh, J. S. (2015). Dynamics of vacuum-sealed, double-leaf partitions. (Thesis). University of Alabama. Retrieved from http://purl.lib.ua.edu/131945

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Kavanaugh, Joshua Stephen. “Dynamics of vacuum-sealed, double-leaf partitions.” 2015. Thesis, University of Alabama. Accessed September 29, 2020. http://purl.lib.ua.edu/131945.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Kavanaugh, Joshua Stephen. “Dynamics of vacuum-sealed, double-leaf partitions.” 2015. Web. 29 Sep 2020.

Vancouver:

Kavanaugh JS. Dynamics of vacuum-sealed, double-leaf partitions. [Internet] [Thesis]. University of Alabama; 2015. [cited 2020 Sep 29]. Available from: http://purl.lib.ua.edu/131945.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kavanaugh JS. Dynamics of vacuum-sealed, double-leaf partitions. [Thesis]. University of Alabama; 2015. Available from: http://purl.lib.ua.edu/131945

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Georgia Tech

2. Kota Pavan, Sriharsha Kota. VCSEL-based multi-mode fiber optical links for 100Gbit/s transmission: Advanced simulation tools and experimental link studies.

Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech

Ever since the first successful demonstration of the fiber-optic systems in 1977, commercial systems have been using multimode fibers (MMF) for short reach applications as the preferred medium of transmission due to their relative ease of use compared to the single-mode fibers (SMF). In short reach applications such as the datacenters, the constraints due to the cost and complexity of deployment drive the choice of associated technology. VCSEL-based MMF optical links offer a cost-effective solution to the growing demand for bandwidth today with the IEEE 802.3 standards group evolving constantly to address the increasing data rate requirements. Thus, advanced multi-level signaling techniques that can pack more bits per symbol need to be explored and implemented in VCSEL-MMF links for achieving speeds > 100Gbit/s. At such higher speeds with tight power budgets, optimum link designing calls for a thorough understanding of the penalties due to the impairments. Hence, advanced modeling tools indispensable. This research aims at addressing the two aspects mentioned above: 1) A thorough understanding of the individual impairments and their temperature dependencies that are not well-understood for current optical links, but are important for future VCSEL-MMF links with speeds approaching 100Gbit/s. In particular, for VCSEL-MMF links using multi-level modulation schemes such as PAM-4, the mode partition noise (MPN) penalty can be a major limiting factor for the link reach, thus making it critical to model it accurately. This work attempts to develop a physical yet simple model for estimating MPN penalty accurately in multi-transverse mode VCSEL-MMF links. 2) PAM-4 based optical links that can achieve > 50Gbit/s speeds with minimum signal processing. Statistical analysis of PAM-4 based multimode fiber (MMF) links is presented using VCSELs at 850nm and 1050nm across a wide range of fiber profiles with EMBc spanning from 2GHz.km to 10GHz.km. Error-free transmission of 51.56Gbit/s is demonstrated over a set of standard OM3 and OM4 fibers up to reaches of 150m with no error-correction (FEC) and 300m at FEC-conformed BER using 850nm and 1050nm VCSELs. Fiber penalties are extracted at BER ~ 10-12 for the set of OM3, OM4, and the WBF tested and results are compared for 850nm and 1050nm links, providing insights into the advantages and challenges in moving to longer wavelengths for bitrates > 50Gbit/s using PAM-4. In addition, plastic optical fiber (POF) based VCSEL-MMF links and the impact of electronic equalization on them is also analyzed for 25Gbit/s and higher speeds. Advisors/Committee Members: Ralph, Stephen E. (advisor), Chang, Gee-Kung (committee member), Klein, Benjamin (committee member), Dupuis, Russell D. (committee member), Chapman, Michael (committee member).

Subjects/Keywords: 25Gbps MMF link; Mode partition noise for VCSEL-based optical links; Relative intensity noise; Short reach optical link; Optical noise in VCSELs; Optical communication; VCSEL-based MMF link; Spectrometry; 50Gbit/s MMF link; PAM-4 based VCSEL-MMF links; Nonlinear equalizer; MMF; POF-based VCSEL links

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kota Pavan, S. K. (2016). VCSEL-based multi-mode fiber optical links for 100Gbit/s transmission: Advanced simulation tools and experimental link studies. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/60403

Chicago Manual of Style (16th Edition):

Kota Pavan, Sriharsha Kota. “VCSEL-based multi-mode fiber optical links for 100Gbit/s transmission: Advanced simulation tools and experimental link studies.” 2016. Doctoral Dissertation, Georgia Tech. Accessed September 29, 2020. http://hdl.handle.net/1853/60403.

MLA Handbook (7th Edition):

Kota Pavan, Sriharsha Kota. “VCSEL-based multi-mode fiber optical links for 100Gbit/s transmission: Advanced simulation tools and experimental link studies.” 2016. Web. 29 Sep 2020.

Vancouver:

Kota Pavan SK. VCSEL-based multi-mode fiber optical links for 100Gbit/s transmission: Advanced simulation tools and experimental link studies. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2020 Sep 29]. Available from: http://hdl.handle.net/1853/60403.

Council of Science Editors:

Kota Pavan SK. VCSEL-based multi-mode fiber optical links for 100Gbit/s transmission: Advanced simulation tools and experimental link studies. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/60403

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