Objective Noise Rating of Gear Whine

Becker, Simone; Yu, Scott

doi:10.4271/1999-01-1720

Cited by 14 publications

(12 citation statements)

References 1 publication

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“…They tend to excite the gear shafts and distort the alignment of the gear sets. Whine noise is further compounded by the human aural system, which is highly tonal-memory sensitive, but has a more limited amplitude memory [4]. Therefore, vehicle occupants tend to become sensitized to this type of noise and, even if attenuated, still sense the noise and remain concerned with regard to possible failure repercussions.…”

Section: Introductionmentioning

confidence: 99%

Axle whine phenomenon in light trucks: a combined numerical and experimental investigation

Koronias

Theodossiades

Rahnejat

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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Axle whine is a continuous, steady state tonal sound, emitted from the differential unit’s hypoid gears. It is essentially induced by torque variations. This can be as a result of resonant conditions or torque fluctuations caused by engine order vibrations, compounded by gear transmission error. The principal mechanism of gear whine noise generation is, therefore, through transmission of vibration from the gear shafts and bearings to the differential housing, which is radiated as noise. Furthermore, interactions between the differential unit, axles and driveshafts often generate excessive tonal noises, which are the result of coupled bending and torsional resonances of assembled components. These resonances induce a magnification effect upon the noise source itself through exciting the gear shafts and distorting the alignment of the gear sets. Axle whine noise has become an important noise, vibration and harshness (NVH) concern, because of the nature of the noise; further compounded by the human aural system, which is highly sensitive in tonal memory. The result is continuously increasing warranty costs or use of expensive palliatives to mitigate the phenomenon. In this paper, a combined experimental and numerical investigation of axle whine in a rear-wheel-drive light truck is presented. The aim is to reveal some root causes of the drivetrain’s NVH behaviour, which can be related to the amplification/reduction of axle whine vibration and noise. Correlation of the experimental results with the vibration modes of the drivetrain has shown that for vehicle coasting conditions a number of modes are excited, which can interact with the vibrations of the hypoid gear pair. Finally, some light is shed on the role that differential bulk oil temperature plays in the severity of the ensuing vibration.

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Section: Introductionmentioning

confidence: 99%

Axle whine phenomenon in light trucks: a combined numerical and experimental investigation

Koronias

Theodossiades

Rahnejat

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…Basically, the interior sound of a car consists of very complex frequency spectrum since it has many excitation sources, resonance systems and parts of sound radiation [1][2][3][4]. However, it is known that the meshing frequency of the gear in the axle system influences the axle-gear whine sound quality [5][6][7]. Other frequency components play roles of background noise.…”

Section: Synthetic Axle-gear Whine Soundmentioning

confidence: 98%

“…Therefore, signal to noise rate is important for the identification of the pure tone sound is embedded background noise [7]. At constant speed of the propeller shaft, the meshing frequency component of the gear tooth generates the axle-gear whine sound inside a car.…”

Section: Signal To Noise Ratio (Snr) Indexmentioning

confidence: 99%

“…These two sound metrics are used for the input of the ANN model, which is a tool to identify the correlation between the axle-gear whine index and the subjective evaluation for the axle-gear whine sound of an SUV. The multiple regressions have been used for modeling of sound quality of gear whine sound [7]. Recently, the ANN has been used for sound quality analysis in automotive engineering [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…To use the output of ANN as the axle-gear whine index, one has to optimize the weights of connectors of the neurons in ANN throughout the training process. For the training process of ANN, 80 interior sounds with the axle-gear whine sound quality of various subjective ratings were synthesized by using the signal characteristics of the gear-gear whine sound, which are well known in many research papers [5][6][7]. Another five interior sounds of SUVs were obtained by measurement, and the axle-gear whine sound qualities for these interior sounds were subjectively evaluated by 21 persons for the target of ANN.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of new sound metric and its application for quantification of an axle gear whine sound by utilizing artificial neural network

2009

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The gear whine sound of an axle system is one of the most important sound qualities in a sport utility vehicle (SUV). Previous work has shown that, because of masking effects, it is difficult to evaluate the gear whine sound objectively by using only the A-weighted sound pressure level. In this paper, a new objective evaluation method for this sound was developed by using new sound metrics, which are developed based on the increment of signal to noise ration and the psychoacoustic parameters in the paper, and the artificial neural network (ANN) used for the modeling of the correlation between objective and subjective evaluation. This model developed by using ANN was applied to the objective evaluation of the axle-gear whine sound for real SUVs and the output of the model was compared with subjective evaluation. The results indicate a good correlation of over 90 percent between the subjective and objective evaluations.

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Practical methods to control gear whine in transmission manufacturing process

Yifan

Zegui³

et al. 2011

Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering (TMEE)

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Objective Noise Rating of Gear Whine

Cited by 14 publications

References 1 publication

Axle whine phenomenon in light trucks: a combined numerical and experimental investigation

Axle whine phenomenon in light trucks: a combined numerical and experimental investigation

Design of new sound metric and its application for quantification of an axle gear whine sound by utilizing artificial neural network

Practical methods to control gear whine in transmission manufacturing process

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