A Combined Experimental - Numerical Approach for Motorcycle Crank Noise: Modeling

Sekita, Masahiko; Tamura, Hiroyuki; Vandenplas, B.; Hendricx, Wim

doi:10.4271/2002-01-2209

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…Hence researchers addressed engine radiated noise reduction in greater detail. Sekita et al [2] demonstrated howt he crank noise radiated from the engine of am otorcycle often spoils the product perception because of its annoying sound. In their paper,anew method using virtual modelling of as ingle-cylinder engine of am otorcycle that succeeds in identifying the mechanism behind the generation of annoying noise is proposed.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Methodology to Design a Helmholtz Resonator for Two-Wheeler Induction Noise Reduction

Suresh¹,

Krishna²,

Ganesh³

et al. 2016

Acta Acustica united with Acustica

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In the recent past there is asteep increase in customer'spreference for powerful vehicles that are yet quieter.Itis very evident that careful attention needs to be givenduring design phase to meet such contradictory requirements. These challenges are even more complexincase of twowheelers because of limited design space, cost restrictions and high power-to-weight ratio. The major noise sources in at wo wheeler include induction system, exhaust system and engine radiated noise. There has been agreat focus on reduction of noise from sources likeexhaust and radiated engine by researchers in the past while very little attention wasgiven to induction noise. Traditionally in case of two-wheelers, an induction system is designed giving paramount importance to engine performance with respect to power and torque developed. Induction noise arising out of such ad esign is dealt by changing material properties and stiffness of panels -a st his design is already frozen for engine performance attributes and no freedom exists for optimization of entire induction system. This approach will have avery limited success in the case of aero-acoustic noise, as design changes mentioned above will have least impact on reduction of induction noise. This paper aims to address these concerns by designing asuitable Helmholtz resonator that helps in reduction of induction noise with very little changes to the layout. AMatlab program is developed to arrive at adesign with maximum Transmission Loss (TL) of resonator.This paper also highlights the challenges involved in incorporating aH elmholtz resonator for induction noise reduction in case of two-wheelers -c hallenges that are not dealt by previous researchers in detail according to authors' knowledge. In this paper,asuccessful methodology is proposed for design and development of an intaker esonator for reduction of induction noise. This methodology is provenu sing objective noise measurements on three different vehicles; achieving at least 5dB(A) noise reduction at snorkel and 1.5 dB(A) noise reduction at pass-by location. The effect of wall flexibility of resonator is studied to optimize resonator'sp erformance. The side effects of introduction of ar esonator on engine performance are studied using representative metric likew heel force. Finally,as ubjective-to-objective correlative measure for induction noise -a5dB(A) reduction at inlet will improve subjective rating by 3points -isestablished.

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Section: Introductionmentioning

confidence: 99%

A Comprehensive Methodology to Design a Helmholtz Resonator for Two-Wheeler Induction Noise Reduction

Suresh¹,

Krishna²,

Ganesh³

et al. 2016

Acta Acustica united with Acustica

View full text Add to dashboard Cite

show abstract

“…Hence, a thermally better design of the engine is not necessarily a better design from the noise point of view. With the advancement of the technology customers now seek more quitter engines for better comfort level [2][3][4]. One of the methods adopted in the design of air-cooled engines is to provide rubber dampers between the fins to reduce the noise radiated by the fins.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Disciplinary Approach for Design Improvement of an Air-Cooled Two-Wheeler Engine Cylinder Head

Singh

Sreenivasulu

Kannan

et al. 2010

SAE Technical Paper Series

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The air-cooled engine surfaces are generally provided with extended surfaces of high conducting materials called fins for enhanced heat transfer. One way to increase the rate of heat transfer is by increasing the fins surface area. However, increase in fin length introduces undesirable vibrations of the fins, which in turn radiate annoying high frequency noise. With the demand of quieter engines increasing, the vehicle manufacturers follow counter measures to minimize the fin vibrations. One trend in the two-wheeler industry is to put rubber dampers between the fins. These rubber dampers damps out the level of vibrations and the level of noise radiated is reduced. However, these rubber dampers have many disadvantages. Apart from the adding extra cost and a parallel manufacture process, these rubbers act as an insulating material, which impede the free flow of cooling air. The engine may get overheated and purpose of providing extended surface would not be satisfied. In this paper, effect of these rubber dampers on engine radiated noise and thermal performance is investigated. We discuss a systematic methodology on how to remove these rubbers by keeping the noise level same along with higher heat transfer from the engine surfaces. Results from experiments and numerical simulations for noise & vibration and computation fluid dynamics (CFD) with conjugate heat transfer are discussed. This paper describes a classic example of multidisciplinary approach to solve real-world design problems.

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Predictive Analysis for Engine/Driveline Torsional Vibration in Vehicle Conditions using Large Scale Multi Body Model

Vandenplas

Gotoh

Dutré³

2003

SAE Technical Paper Series

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A Combined Experimental - Numerical Approach for Motorcycle Crank Noise: Modeling

Cited by 5 publications

References 1 publication

A Comprehensive Methodology to Design a Helmholtz Resonator for Two-Wheeler Induction Noise Reduction

A Comprehensive Methodology to Design a Helmholtz Resonator for Two-Wheeler Induction Noise Reduction

A Multi-Disciplinary Approach for Design Improvement of an Air-Cooled Two-Wheeler Engine Cylinder Head

Predictive Analysis for Engine/Driveline Torsional Vibration in Vehicle Conditions using Large Scale Multi Body Model

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