The Passive Acoustic Effect of Automotive Catalytic Converters

Lavrentjev, Jüri; Rämmal, Hans; Tiikoja, Heiki

doi:10.4271/2011-24-0219

Cited by 10 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several causative factors have been identified. Through their research, Lavrentjev et al [3] suggested that the increased noise was caused by a change in the exhaust system's cross-sectional area resulting in sound waves' dissipation. Reinforcing these results, Prajapati & Desai [17] found that the presence of flow resistance due to the addition of a catalytic converter causes a dissipative effect that affects the sound transmitted at the exhaust tip.…”

Section: Resultsmentioning

confidence: 99%

“…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. 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.…”

Section: Introductionmentioning

confidence: 80%

“…Therefore, it is necessary to study the effect of noise on vehicles that have applied TMCC to the exhaust system. Thus, the researchers have sufficient knowledge when designing a TMCC, which can reduce exhaust emissions and noise [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Ariyanto¹,

Cahyadi²,

Hadi³

et al. 2022

mesin

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 80%

See 1 more Smart Citation

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

Ariyanto¹,

Cahyadi²,

Hadi³

et al. 2022

mesin

View full text Add to dashboard Cite

show abstract

“…where S 21 is 𝑆-matrix element describing the sound transmission through the test object [16][17][18].…”

Section: Transmission Loss Measurements For Concept Layoutsmentioning

confidence: 99%

Concept study of sustainable noise control solution for HVAC systems based on microperforated elements

Lavrentjev¹,

Rämmal²,

Villau³

2021

PEAS

View full text Add to dashboard Cite

“…deterioration of performance due to relocation and blow out of the fibers, challenging demands have been stipulated in Directive 97/24/EC [3] on the implementation of the fibrous materials. A recent investigation [4] on the use of micro-perforated (MP) elements in flow-duct silencers has proven that the fibrous materials can be successfully substituted by the MP elements.…”

Section: Introductionmentioning

confidence: 99%

A Novel Design for Cruiser Type Motorcycle Silencer Based on Micro-Perforated Elements

Kabral¹,

Rämmal²,

Auriemma³

et al. 2012

SAE Technical Paper Series

Self Cite

View full text Add to dashboard Cite

Kabral, R.; Rämmal, H.; Auriemma, F.; Luppin, J.; Koiv, R.; Tiikoja, H.; Lavrentjev, J. ABSTRACTRegulations stipulating the design of motorcycle silencers are strict, especially when the unit incorporates fibrous absorbing materials. Therefore, innovative designs substituting such materials while still preserving acceptable level of characteristic sound are currently of interest.Micro perforated elements are innovative acoustic solutions, which silencing effect is based on the dissipation of the acoustic wave energy in a pattern of sub-millimeter apertures. Similarly to fibrous materials the micro perforated materials have been proved to provide effective sound absorption in a wide frequency range. Additionally, the silencer is designed as a two-stage system that provides an optimal solution for a variety of exploitation conditions. In this paper a novel design for a cruiser type motorcycle silencer, based on micro-perforated elements, is presented. It has been demonstrated that the micro perforated elements can successfully be used to achieve high attenuation of IC-engine noise in strictly limited circumstances. A technical description of the design and manufacturing of the prototype silencer is given and technological issues are discussed. The acoustical and aerodynamical performance of the silencer is characterized by transmission loss and pressure drop data. The influence of the two-stage system valve operation has been analyzed by studying the acoustics data and engine output characteristics.In addition to the experimental investigations, numerical 1-D models were developed for the optimization of the silencer geometry and the results are compared in a number of operating conditions. The studies have resulted in development of a silencer system for a small series cruiser type motorcycle. The first silencer prototypes have been tested on the motorcycle. While maintaining acceptable pressure drop characteristics, it has proven to comply with standard noise criteria without incorporating fibrous materials.The radiated motorcycle sound, as one of the key features of successful design, has been evaluated. The sound design has been recognized as well suitable for the product. Preprint of the paper: Kabral, R.; Rämmal, H.; Auriemma, F.; Luppin, J.; Koiv, R.; Tiikoja, H.; Lavrentjev, J. "A Novel Design for Cruiser Type Motorcycle Silencer Based on Micro-Perforated Elements". Preprint of the paper: Kabral, R.; Rämmal, H.; Auriemma, F.; Luppin, J.; Koiv, R.; Tiikoja, H.; Lavrentjev, J. "A Novel Design for Cruiser Type Motorcycle Silencer Based on Micro-Perforated Elements". Preprint of the paper: Kabral, R.; Rämmal, H.; Auriemma, F.; Luppin, J.; Koiv, R.; Tiikoja, H.; Lavrentjev, J. "A Novel Design for Cruiser Type Motorcycle Silencer Based on Micro-Perforated Elements".

show abstract

The Passive Acoustic Effect of Automotive Catalytic Converters

Cited by 10 publications

References 10 publications

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

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

Concept study of sustainable noise control solution for HVAC systems based on microperforated elements

A Novel Design for Cruiser Type Motorcycle Silencer Based on Micro-Perforated Elements

Contact Info

Product

Resources

About