Experimental Facility for the Complete Determination of Sound Transmission in Turbochargers

Rämmal, Hans; Åbom, Mats; Tiikoja, Heiki; Bodén, Hans

doi:10.4271/2010-01-1424

Cited by 13 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• signal amplifier (Yamaha AS201). The transmission loss measurement is based on the 2-port method [16], where two electro-dynamic drivers are used as excitation sources and the relevant data is measured by four in-duct microphones (see Fig. 5).…”

Section: Transmission Loss Measurements For Concept Layoutsmentioning

confidence: 99%

See 1 more Smart Citation

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

Section: Transmission Loss Measurements For Concept Layoutsmentioning

confidence: 99%

“…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

“…However, due to the harsh conditions at compressor outlet (temperature as high as 150°C, oil particulates in the flow, pressure up to 2bar), it is quite difficult to implement a reliable solution with an acoustic source placed on the high pressure side of the compressor. Recent studies [7,8] have implemented such a solution; however they always used compressor drivers which can sustain harsh conditions but are of low precision at low frequencies. It was hence chosen to use the Two-Load technique, which allows us to use only one acoustical source, on the low pressure side.…”

Section: Transfer Matrixesmentioning

confidence: 99%

Determination of the transfer matrix of an automotive compressor under realistic flow conditions

Rousselet

Gibiat

Lefebvre

et al. 2013

The Journal of the Acoustical Society of America

View full text Add to dashboard Cite

Determination of the transfer matrix of an automotive compressor under realistic flow conditions Waves propagating into air intake pipes of automotive engines have been widely studied and are commonly used to obtain high volumetric efficiency. Nowadays, most of modern engines have a centrifugal compressor in their intake line. If the acoustic of intakes lines for naturally aspirated engines is well known, it is not the case for lines comprising a compressor, where both the geometry and the flow effects are of primary interest. As it is quite difficult to experimentally determine the acoustical behavior of a complete line comprising a compressor, a new system has been developed for determining acoustical transfer matrixes of each separated element of the line with flow. This new method is based on the two loads method; where a derivative of the Two Measurements Three Calibrations calibration method has been introduced. The basics of the determination of transfer matrixes with flow with our method are presented, then experimental results on cylindrical tubes and parts of intake lines are discussed. Finally an example of a transfer matrix of centrifugal compressor is presented.

show abstract

“…On the other hand, reflection mechanisms work to reduce wave energy through multiple reflections from discontinuities and changes in the crosssectional area. Reflection is especially beneficial at lower frequencies, where absorption may be less effective [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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

Villau,

Rämmal,

Lavrentjev

2024

PEAS

View full text Add to dashboard Cite

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.

show abstract

Experimental Facility for the Complete Determination of Sound Transmission in Turbochargers

Cited by 13 publications

References 6 publications

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

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

Determination of the transfer matrix of an automotive compressor under realistic flow conditions

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

Contact Info

Product

Resources

About