Prediction of wind noise radiated from passenger cars and its evaluation based on auralization

Ono, Kenji; Himeno, Ryutaro; Fukushima, Tatsuya

doi:10.1016/s0167-6105(99)00033-1

Cited by 35 publications

(17 citation statements)

References 16 publications

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“…A car design can only be acceptable if its form drag and aerodynamic noise are both reduced at the same time. Many researchers have made use of CFD techniques [1][2][3][4] and aero-acoustics analysis [5][6][7] topics on acoustics have been studied throughout the years. For example, acoustic holography was adopted to identify the noise sources of a vehicle underbody [8].…”

Section: Introductionmentioning

confidence: 99%

Computational aero-acoustic analysis of a passenger car with a rear spoiler

Tsai

Tai

et al. 2009

Applied Mathematical Modelling

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a b s t r a c tThis study proposes an effective numerical model based on the Computational Fluid Dynamics (CFD) approach to obtain the flow structure around a passenger car with wing type rear spoiler. The topology of the test vehicle and grid system is constructed by a commercial package, ICEM/CFD. FLUENT is the CFD solver employed in this study. After numerical iterations are completed, the aerodynamic data and detailed complicated flow structure are visualized using commercial packages, Field View and Tecplot. The wind effect on the aerodynamic behavior of a passenger car with and without a rear spoiler and endplate is numerically investigated in the present study. It is found that the installation of a spoiler with an appropriate angle of attack can reduce the aerodynamic lift coefficient. Furthermore, the installation of an endplate can reduce the noise behind the car. It is clear that the vertical stability of a passenger car and its noise elimination can be improved. Finally, the aerodynamics and aero-acoustics of the most suitable design of spoiler is introduced and analyzed.

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Section: Introductionmentioning

confidence: 99%

Computational aero-acoustic analysis of a passenger car with a rear spoiler

Tsai

Tai

et al. 2009

Applied Mathematical Modelling

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“…In the engineering pratical applications, their behaviour in the various flow conditions needs to be well understood and if it is not, the annoying flow-induced-problems may exist and consequently degrade the performance of the design. This can be clearly observed from the noise emitted from a side view mirror of passenger car when moving at high speed, i.e., 80 km/h [1], a landing gear system of aircraft when about to land [2,3] and a pantograph system of high speed train when moving at transition speed 225 km/h [4]. The wake generated by the bridge piers is also a concern for civil engineering as it can creates a scour (a hole due to the removal of sediment) around bridge piers when the wake forms a horseshoe vortex in the channel bed [5].…”

Section: Background Of the Studymentioning

confidence: 98%

Aeolian Tones Radiated from Flow Over Bluff Bodies

Ali¹,

Zaki²,

Ismail³

et al. 2013

TOMEJ

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Bluff body is a simple but a central shape for many engineering applications. The geometry shape of the bluff body characterises the behaviour of the flow over the bluff body, where a more complex flow structure is found near downstream. Shear layer separation is mainly responsible for the periodic global phenomena, that includes the generation of sound. The magnitude of the aerodynamically generated sound is dominated by the fluctuations of aerodynamics forces, i.e., drag and lift. The study also shows that the sound pressure field is shaped by the aeolian tones that is related strongly to the lift fluctuations of the bluff body. Amplitude and frequency of the fluctuating lift change naturally with the shape of a particular bluff body. Triangular cylinder exhibits the largest sound pressure level (41.9 dB) followed by ellipse and circular shapes. Square cylinder emits the lowest sound pressure level (36.7 dB). This corresponds to the longest downstream vortex formation length at which for a square cylinder the long vortex formation length provides space for more vortex to dissipate.

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“…[1][2][3][4][5][6] In particular, airframe noise, which is generated through the interaction between the turbulent flow and the solid bodies on the aircraft, has been identified as an "aircraft noise barrier" since the early seventies. 7 Therefore, considering the interdisciplinary challenge between fluid mechanics and acoustics arising from this noise effect, airframe noise reduction has become a major concern for stakeholders within the aviation sector, acoustic experts, fluid mechanics engineers and researchers.…”

Section: Introductionmentioning

confidence: 99%

Use of dual planar jets for the reduction of flow-induced noise

et al. 2017

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The planar jet has been proposed to reduce the flow-induced noise. However, the self-noise emission from a single planar jet is a limiting factor on the performance based characteristics of this technology. Therefore, this research paper reports an alternative dual planar jets geometry in an attempt to minimize the self-noise of the single planar jet, thus, further enhancing total noise reduction in the application. Tandem cylinders are considered as the generic bluff body, which represents the source of flow-induced noise. Tests are conducted to capture noise reduction effects when using a single planar jet geometry. Subsequently, two different configurations of the dual planar jets geometry were tested in comparison. It is observed that the dual jets geometry achieves more noise reduction when compared to the single jet. Moreover, conclusions are made on the most efficient configuration in the dual jets geometry.

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Prediction of wind noise radiated from passenger cars and its evaluation based on auralization

Cited by 35 publications

References 16 publications

Computational aero-acoustic analysis of a passenger car with a rear spoiler

Computational aero-acoustic analysis of a passenger car with a rear spoiler

Aeolian Tones Radiated from Flow Over Bluff Bodies

Use of dual planar jets for the reduction of flow-induced noise

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