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You searched for +publisher:"University of Cincinnati" +contributor:("Lim, Teik C."). One record found.

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1. SONDKAR, PRAVIN BANDU. A Hearing-Based, Frequency Domain Sound Quality Model for Combined Aerodynamic and Power Transmission Response With Application To Rotorcraft Interior Noise.

Degree: PhD, Engineering : Mechanical Engineering, 2008, University of Cincinnati

The severity of combined aerodynamics and power transmission response in high-speed, high power density systems such as a rotorcraft is still a major cause of annoyance in spite of recent advancement in passive, semi-active and active control. With further increase in the capacity and power of this class of machinery systems, the acoustic noise levels are expected to increase even more. To achieve further improvements in sound quality, a more refined understanding of the factors and attributes controlling human perception is needed. In the case of rotorcraft systems, the perceived quality of the interior sound field is a major determining factor of passenger comfort. Traditionally, this sound quality factor is determined by measuring the response of a chosen set of juries who are asked to compare their qualitative reactions to two or more sounds based on their subjective impressions. This type of testing is very time-consuming, costly, often inconsistent, and not useful for practical design purposes. Furthermore, there is no known universal model for sound quality. The primary aim of this research is to achieve significant improvements in quantifying the sound quality of combined aerodynamic and power transmission response in high-speed, high power density machinery systems such as a rotorcraft by applying relevant objective measures related to the spectral characteristics of the sound field. Two models have been proposed in this dissertation research. First, a classical multivariate regression analysis model based on currently known sound quality metrics as well some new metrics derived in this study is presented. Even though the analysis resulted in the best possible multivariate model as a measure of the acoustic noise quality, it lacks incorporation of human judgment mechanism. The regression model can change depending on specific application, nature of the sounds and types of juries used in the study. Also, it predicts only the averaged preference scores and does not explain why two jury members differ in their judgment. To address the above shortcoming of applying regression analysis, a new human judgment model is proposed to further improve the ability to predict the degree of subjective annoyance. The human judgment model involves extraction of subjective attributes and their values using a proposed artificial jury processor. In this approach, a set of ear transfer functions are employed to compute the characteristics of sound pressure waves as perceived subjectively by human. The resulting basilar membrane displacement data from this proposed model is then applied to analyze the attribute values. Using this proposed human judgment model, the human judgment mechanism, which is highly sophisticated, will be examined. Since the human judgment model is essentially based on jury attributes that are not expected to change significantly with application or nature of the sound field, it gives a more common basis to evaluate sound quality. This model also attempts to explain the inter-juror differences in opinion,… Advisors/Committee Members: Lim, Teik C. (Committee Chair).

Subjects/Keywords: Acoustics; Mechanical Engineering; Sound Quality model; Aerodynamic noise; Powertransmission noise; human judgment model; Attribute analysis; Rotorcraft interior noise

…model) University of Cincinnati Jury Participants Preparation of Sounds Jury Testing… …previously funded project that involves a multi-year collaboration between the University of… …Cincinnati, the University of Hartford and an anonymous aerospace company. The following chart… 

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

APA (6th Edition):

SONDKAR, P. B. (2008). A Hearing-Based, Frequency Domain Sound Quality Model for Combined Aerodynamic and Power Transmission Response With Application To Rotorcraft Interior Noise. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1203968025

Chicago Manual of Style (16th Edition):

SONDKAR, PRAVIN BANDU. “A Hearing-Based, Frequency Domain Sound Quality Model for Combined Aerodynamic and Power Transmission Response With Application To Rotorcraft Interior Noise.” 2008. Doctoral Dissertation, University of Cincinnati. Accessed September 24, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1203968025.

MLA Handbook (7th Edition):

SONDKAR, PRAVIN BANDU. “A Hearing-Based, Frequency Domain Sound Quality Model for Combined Aerodynamic and Power Transmission Response With Application To Rotorcraft Interior Noise.” 2008. Web. 24 Sep 2020.

Vancouver:

SONDKAR PB. A Hearing-Based, Frequency Domain Sound Quality Model for Combined Aerodynamic and Power Transmission Response With Application To Rotorcraft Interior Noise. [Internet] [Doctoral dissertation]. University of Cincinnati; 2008. [cited 2020 Sep 24]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1203968025.

Council of Science Editors:

SONDKAR PB. A Hearing-Based, Frequency Domain Sound Quality Model for Combined Aerodynamic and Power Transmission Response With Application To Rotorcraft Interior Noise. [Doctoral Dissertation]. University of Cincinnati; 2008. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1203968025

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