東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Sound quality of diesel engines.

Hastings, Aaron Lee.

FindBook

Google Book

Amazon

博客來

Sound quality of diesel engines.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Sound quality of diesel engines./
作者:	Hastings, Aaron Lee.
面頁冊數:	393 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 5998.
Contained By:	Dissertation Abstracts International65-11B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3154642
ISBN:	9780496151721

Sound quality of diesel engines.
Hastings, Aaron Lee.

Sound quality of diesel engines. - 393 p.

Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 5998.

Thesis (Ph.D.)--Purdue University, 2004.

Variations in timing and amplitude of combustion events in diesel engines and the presence of tonal components affect the perceived attributes of the sound generated by these engines. People use the levels of these attributes when making overall judgments of the quality of the sound and these attributes influence how annoying the sound is perceived to be. The objective of the research was to be able to relate annoyance, combustion variations, and sound characteristics. Sounds from many diesel engines were measured and a sound simulation program was developed whereby timing and amplitude variation, combustion pressure profiles, transfer paths, the noise floor, and the presence of additional tonal components could be controlled. Aures Tonality was examined and refined to improve its predictions of stationary narrow-band noise. Aures Tonality was combined with statistical attributes of the Zwicker and Fastl sound quality metrics: Loudness, Sharpness, Fluctuation Strength, and Roughness, and used as inputs to an annoyance model. The influences of combustion variations and tonal presence on sound attributes and annoyance were also examined. It was found that the least annoying timing variations were at a level of 16 percent of the engine firing period and the least annoying amplitude variations were at a level of 20 percent of the nominal combustion amplitude. As the variation level increased or decreased from these levels, annoyance increased. For periodic variations, as the frequency of variation increased from 2 to 8 Hz, the annoyance decreased. A linear model which combined the effects of several sound quality metrics was developed from which it could be seen that annoyance increased as the frequency of tones, Sharpness, Loudness, Tonality, and Fluctuation Strength increased. The psychoacoustic model described by Fastl was also examined and a new term based on the modified Tonality metric was included to model the observed increase in annoyance with increasing Tonality. Recommended future work includes modifying the Tonality model to take into account the asymmetry of auditory filters and validating the modified Tonality and annoyance models to demonstrate their broader applicability beyond explaining the responses of the subjects taking part in the tests described in this manuscript.

ISBN: 9780496151721Subjects--Topical Terms:

783786
Engineering, Mechanical.

Sound quality of diesel engines.
LDR:03256nmm 2200301 4500 001 1829802
005 20070313104725.5
008 130610s2004 eng d
020 $a 9780496151721
035 $a (UnM)AAI3154642
035 $a AAI3154642
040 $a UnM $c UnM
100 1 $a Hastings, Aaron Lee. $3 1918653
245 1 0 $a Sound quality of diesel engines.
300 $a 393 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 5998.
500 $a Major Professors: Patricia Davies; J. Stuart Bolton.
502 $a Thesis (Ph.D.)--Purdue University, 2004.
520 $a Variations in timing and amplitude of combustion events in diesel engines and the presence of tonal components affect the perceived attributes of the sound generated by these engines. People use the levels of these attributes when making overall judgments of the quality of the sound and these attributes influence how annoying the sound is perceived to be. The objective of the research was to be able to relate annoyance, combustion variations, and sound characteristics. Sounds from many diesel engines were measured and a sound simulation program was developed whereby timing and amplitude variation, combustion pressure profiles, transfer paths, the noise floor, and the presence of additional tonal components could be controlled. Aures Tonality was examined and refined to improve its predictions of stationary narrow-band noise. Aures Tonality was combined with statistical attributes of the Zwicker and Fastl sound quality metrics: Loudness, Sharpness, Fluctuation Strength, and Roughness, and used as inputs to an annoyance model. The influences of combustion variations and tonal presence on sound attributes and annoyance were also examined. It was found that the least annoying timing variations were at a level of 16 percent of the engine firing period and the least annoying amplitude variations were at a level of 20 percent of the nominal combustion amplitude. As the variation level increased or decreased from these levels, annoyance increased. For periodic variations, as the frequency of variation increased from 2 to 8 Hz, the annoyance decreased. A linear model which combined the effects of several sound quality metrics was developed from which it could be seen that annoyance increased as the frequency of tones, Sharpness, Loudness, Tonality, and Fluctuation Strength increased. The psychoacoustic model described by Fastl was also examined and a new term based on the modified Tonality metric was included to model the observed increase in annoyance with increasing Tonality. Recommended future work includes modifying the Tonality model to take into account the asymmetry of auditory filters and validating the modified Tonality and annoyance models to demonstrate their broader applicability beyond explaining the responses of the subjects taking part in the tests described in this manuscript.
590 $a School code: 0183.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Acoustics. $3 1019086
650 4 $a Engineering, Automotive. $3 1018477
690 $a 0548
690 $a 0986
690 $a 0540
710 2 0 $a Purdue University. $3 1017663
773 0 $t Dissertation Abstracts International $g 65-11B.
790 1 0 $a Davies, Patricia, $e advisor
790 1 0 $a Bolton, J. Stuart, $e advisor
790 $a 0183
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3154642