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Title: Frequency Band Interference for the Attenuation of Combustion Noise in a DI Diesel Engine.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1373177
Report Number(s):
SAND2016-7087PE
646059
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the ACEC Meeting held July 21, 2016 in Southfield, MI.
Country of Publication:
United States
Language:
English

Citation Formats

Busch, Stephen. Frequency Band Interference for the Attenuation of Combustion Noise in a DI Diesel Engine.. United States: N. p., 2016. Web.
Busch, Stephen. Frequency Band Interference for the Attenuation of Combustion Noise in a DI Diesel Engine.. United States.
Busch, Stephen. 2016. "Frequency Band Interference for the Attenuation of Combustion Noise in a DI Diesel Engine.". United States. doi:. https://www.osti.gov/servlets/purl/1373177.
@article{osti_1373177,
title = {Frequency Band Interference for the Attenuation of Combustion Noise in a DI Diesel Engine.},
author = {Busch, Stephen},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7
}

Conference:
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  • Experiments were performed to examine the cause and effect relationship between the Diesel Engine Heat Release Rate, Cylinder Pressure Development and Engine Noise. The periodic heat release rate, pressure development and the noise from the engine exhibited a very high degree of causal relationship at frequencies below 2 kHz and somewhat lower but still significant causality at higher frequencies. The results seem to show that the noise produced by the Diesel engine is essentially dominated by low frequency components of the pressure trace and therefore manipulation of the pressure trace will have only a limited effect on the noise ofmore » Diesel engines.« less
  • The authors have been conducting studies on the reduction of exhaust emissions using a high speed diesel engine. By applying composite countermeasures consisting of five items; 1) timing retard, 2) optimization of fuel injection system, 3) water-in-oil type emulsified fuel, 4) application of ignition improver and 5) an increase in air flow quantity, an exhaust NO/sub x/ level less than a half of the original was attained while retaining the original low levels of fuel consumption, smoke density and engine noise. The authors developed new measuring instruments in order to grasp the true nature of combustion, especially to clarify themore » delicate change in combustion. By using these instruments, the combustion phenomena were analyzed accurately, speedily and synthetically on various aspects such as combustion mode, vibration, noise, thermal loading, heat balance, etc. The complicated combustion behavior in the cylinder has been clarified in part by simultaneous measurement of cylinder pressure at several points.« less
  • This paper describes an attempt to clarify the characteristics of combustion noise generation of the engine structure. The transmission-radiation coefficient of combustion noise is proposed as a conversion ratio of the combustion noise power from the gas vibration power affecting the inner surface of the combustion chamber. These experiments were carried out both with a stationary engine excited by a single explosion and an operating engine. From these results, the frequency characteristics of the combustion noise generated by each engine wall and the vibration response of each transmission path are discussed.
  • The Computational Fluid Dynamics (CFD) Code KIVA II has been applied to model combustion pressure oscillations in the Indirect Injection Diesel Engine. These oscillations are attenuated and transmitted by the engine structure to the surroundings as noise. The computational model was used to evaluate changes in design and operating characteristics of an engine, and the effect of these on the intensity of gas pressure oscillation. The results in general corroborate the trends of published experimental measurements of combustion noise. A 40% increase in grid resolution showed minor changes in the magnitude of cylinder pressure oscillation and approximately 0.5{degree} crank anglemore » phase advance in the oscillation cycle compared with the grid used for the results presented here. 18 refs., 18 figs.« less
  • A pollutant that has not yet received as much public or regulatory attention as gaseous or solid particulate emissions is engine generated noise. Excessive levels of noise can, however, be as harmful to human health and the environment as noxious gases. In a well-designed engine, mechanical noise can be kept to a minimum but the combustion process itself still generates noise, combustion noise. Thus, if the combustion process is modified for exhaust emission control it can be expected that the level of noise generated by combustion will also be affected, albeit not necessarily adversely. As exhaust gas recirculation (EGR) ismore » becoming an essential technology for NOx emission control in diesel engines, and, as this technique modifies the combustion process, it is important that the effects of using EGR on noise generation be identified.« less