Design of an acoustic enclosure with duct silencers for the heavy duty diesel engine generator set

Ju, Hyeon-Don; Lee, Shi-Bok; Jeong, Weui-Bong; Lee, Byung‐Hoon

doi:10.1016/j.apacoust.2003.10.007

Cited by 12 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In less than 25 kW standby generator noise baseline spectrum, the dominant frequencies were found to be present at 250-315 Hz third octaves low frequencies and 1250-2000 Hz third octaves high frequencies caused by engine and exhaust noise, and airflow, fan and alternator noise, respectively. In heavy-duty diesel engine generator sets, Ju et al (2004) noted that the sound pressure level is most pronounced at the frequency level of 500 Hz. Contributions of the two frequency components of 125 and 250 Hz were little.…”

Section: Introductionmentioning

confidence: 99%

“…Liu and Lu (2009;2010) separately studied the attenuation inside long enclosures due to different tunnel branching configurations and reported positive effects on sound level attenuation, early decay and reverberation time. Ju et al (2004) also applied ventilation duct silencers for fresh air intake and outflow of noise and heated air away from the receiver location. The present paper explores the duct mitigation measure to the generator noise by ducting out the combustion and the cooling air carrier of the noise after the interaction with the engine.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acoustic Characterization of Retrofit Vertical Duct Soundproof Enclosure for Portable Mini-Generators

Agbo

2020

MJST

View full text Add to dashboard Cite

Environmental noise pollution from electric power generators has become seemingly intractable in most developing countries due to the epileptic power supply. Families as well as corporate organizations now rely on these standby generators for their daily electricity needs. The concern of this paper was the characterization of the developed vertical duct soundproof acoustic enclosure on mitigating the noise produced by portable mini generators. A total of six acoustic parallelepiped boxes were produced using chopped strand E-glass fiber mat reinforced composite panels with polyurethane foam inner lining. The generator noise spectra with and without the enclosure were obtained for comparative analysis. The sound pressure level of the generator noise at each enclosure height was also measured. It was found out that the noise level reduced by 12.8 dBA when the sound pressure levels at both conditions were taken and compared at optimal enclosure height (1600 mm). The result from exhaust ducting showed that exhaust duct projection, channeling out the fumes, did not significantly impact the enclosure insertion loss. The enclosure and the generator were also found to be in stable, acceptable thermal conditions while operating at rated load with a maximum temperature of 39 °C measured inside the enclosure. This eliminates the need for artificial cooling and its consequent power drain.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic Characterization of Retrofit Vertical Duct Soundproof Enclosure for Portable Mini-Generators

Agbo

2020

MJST

View full text Add to dashboard Cite

show abstract

“…Diverse types of silencers with much different acoustic structures in the construction geometry and materials have been being used in various engineering and industrial equipments and environmental facilities [2]. Silencers of simple structure mounted already many analytical or simple approximate solutions for their acoustic behavioral characteristics.…”

Section: Introductionmentioning

confidence: 99%

Transmission loss estimation of splitter silencer using multi-domain BEM

Lee

Park

2007

J Mech Sci Technol

Self Cite

View full text Add to dashboard Cite

This paper suggests a practical method, based on multi-domain BEM, to calculate the transmission loss of 3-dimensional silencers of subdomains comprised of different geometric and material characteristics with looped and/or cascaded connections. We previously proposed an efficient method to compute the transmission loss for 3-dimensional silencers using multi-domain BEM but its application is much difficult to those having looped subdomains [l]. Here, we adopt a method summing the impedance matrices of the subdomains with various types of connection represented by system graph. The algebraic overall condensed acoustic equations having only particle velocities on the subdomain interface boundaries as unknowns are formulated. A splitter silencer of cascaded, looped and symmetric connections as a sample problem is dealt with for the explanation and verificationof the proposed method. An experimental work with the splitter silencer is performed to back lip the suggested method.

show abstract

“…Considering a constant density of the hot gas layer in a burning room, the flow coefficient of the buoyancy driven fire gases flowing through a door is 0.68 (Emmons, 2002). The cooling performance of a designed enclosure model is checked by numerical thermal flow analysis with a computational fluid dynamics (CFD) code FLUENT (Ju et al, 2004). Correlation equations of mass flow rates proposed by Nakaya et al were studied numerically with FDS (Nakaya et al, 1986;Chow and Zou, 2005).…”

Section: Introductionmentioning

confidence: 99%

Flow Coefficients of Doorway Flow Field in Two-room Building Fires

Ju¹,

Kim²

2012

Journal of Korean Society of Hazard Mitigation

View full text Add to dashboard Cite

In the case of a fire of two-room's enclosure, the inflow and outflow mass rates through the doorway located between a burn room and an adjacent room have been researched. The objective of this study are to calculate the flow rates through the doorway of the burn room, to study the inflow and outflow coefficients of the doorway, and accurately to predict the neutral-plane height from the floor of the room in the stratified fire cases of the two-room's enclosure. The inflow and outflow mass rates are analyzed by FDS developed by the National Institute of Standard and Technology, USA. The analyzed results by FDS are compared with the experimental results performed by Nakaya et al. By our study it is known that the flow coefficients vary according to fire size and opening configuration and the mean values of the inflow and outflow coefficients are 0.8 and 1.0 respectively.

show abstract

Design of an acoustic enclosure with duct silencers for the heavy duty diesel engine generator set

Cited by 12 publications

References 1 publication

Acoustic Characterization of Retrofit Vertical Duct Soundproof Enclosure for Portable Mini-Generators

Acoustic Characterization of Retrofit Vertical Duct Soundproof Enclosure for Portable Mini-Generators

Transmission loss estimation of splitter silencer using multi-domain BEM

Flow Coefficients of Doorway Flow Field in Two-room Building Fires

Contact Info

Product

Resources

About