Acoustic Analysis of Small Engine Catalytic Converters

Lavrentjev, Jüri; Rämmal, Hans

doi:10.4271/2010-32-0022

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…Naufal et al [19] also found similar results, where the findings showed that the use of TMCC significantly affected the noise coming out of the exhaust tip. However, in contrast to this study, two studies by Lavrentjev & Rammal [3], [4] stated that catalytic converters could reduce noise. Furthermore, the fundamental question in this research is, does the use of TMCC on the 2005 Honda Supra FIT motorcycle meet the noise standards set by the government?…”

Section: Resultscontrasting

confidence: 75%

“…In contrast to these results, Lavrentjev & Rämmal [3] the application of TMCC in the form of a honeycomb is proven to reduce noise significantly. Then, Lavrentjev & Rammal's [4] research also showed that the use of a catalytic converter was able to reduce the noise level in each design of different sizes with a decrease in the noise level between 7-8 db. These two studies show that applying technology such as a catalytic converter or similar TMCC can significantly reduce the noise produced.…”

Section: Introductionmentioning

confidence: 96%

“…However, relatively few papers are concerned with discussing the TMCC noise generated. Sulistiyono & Warju [4] applies TMCC made of nickel-plated brass, where the results show an increase in noise of 8.61%. In contrast to these results, Lavrentjev & Rämmal [3] the application of TMCC in the form of a honeycomb is proven to reduce noise significantly.…”

Section: Introductionmentioning

confidence: 99%

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Noise Effects Using Transition Metal Catalytic Converter Chrome-Coated Copper on Four Stroke Motorcycles

Ariyanto¹,

Cahyadi²,

Hadi³

et al. 2022

mesin

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Over the past few years, the Transition Metal Catalytic Converter (TMCC) has become a standard of the exhaust system of internal combustion engines. Besides being used to reduce exhaust emissions, TMCC also has a certain effect on the noise produced. In this study, the effect of noise in the use of TMCC chrome plated copper (CuCr) was investigated. The noise test was carried out in two conditions with the same vehicle, by using a 2005 Honda Supra Fit with standard exhaust conditions and using TMCC CuCr. Noise testing was carried out based on the ISO/FDIS 5130 standard, and then the results were compared with the noise standard regulated in Permen LH No. 7 of 2009. The findings show that the use of TMCC CuCr is less efficient in reducing the vehicle noise. This is proven from the comparison results which show that on average the TMCC CuCr exhaust tends to be 10% louder than the standard exhaust. The noise test results show that the measured noise at RPM 5000 is 82.2 dBA for standard exhaust and 95.4 dBA for TMCC CuCr exhaust, while the noise standard stipulated in Ministerial Regulation No. 7 of 2009 is only 90 dBA. Through these results, it can be concluded that the use of TMCC CuCr exhaust does not accordance with the government standards and included in "Not Passed Noise Test" category.

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Section: Resultscontrasting

confidence: 75%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Noise Effects Using Transition Metal Catalytic Converter Chrome-Coated Copper on Four Stroke Motorcycles

Ariyanto¹,

Cahyadi²,

Hadi³

et al. 2022

mesin

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“…The TL measurement is based on the twoport method [15], where two electrodynamic drivers are used as ex citation sources and the relevant data are measured by four microphones (see Fig. 4).…”

Section: Transmission Loss Measurementsmentioning

confidence: 99%

Experimental concept study of a small engine silencer unit based on microperforated elements

Villau,

Rämmal,

Lavrentjev

2024

PEAS

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Considering the green transformation, more and more attention must be paid to reducing noise pollution, which is one of the most important environmental problems today. Internal combustion engine (ICE) powered hand tools and small appliances, such as leaf blowers, brush cutters, chainsaws, and lawn mowers, are examples of the most undesirable sources of noise in today's human environment. This paper discusses the acoustic properties of a novel and compact silencer for a small twostroke ICE and proposes a novel concept with corresponding acoustic properties. The proposed solution has been measured on a test bench, and its properties, including transmission loss (TL) and reflection and absorption properties, have been experimentally determined. Using 3D printing technology and technological advantages, an innovative silencer with up to two microperforated (MP) panels, integrated into the expansion chamber of the original silencer, has been applied for rapid prototyping. As a result, noise reduction has been increased by at least 20 dB in the frequency range 800-4000 Hz.

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