6 Speed Automatic Transmission Vibration Magnitude Prediction and Whine Noise Improvement through Transmission System Modeling

Shin, Won; Kanase, Ashish; Hwang, Seung Hyun; Baek, Sangbum; Shim, Hyutae; Oh, Seiwoong

doi:10.4271/2011-01-1553

Cited by 12 publications

(2 citation statements)

References 4 publications

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“…Shin et al predicted the vibration levels of a six-speed automatic transmission gearbox using Romax software, and good correlation with experimental results was demonstrated. The whine noise was improved using a planetary gear microgeometry optimization process [6]. Kanase et al predicted the vibration levels of a manual gearbox housing that was excited by transmission errors.…”

Section: Introductionmentioning

confidence: 99%

Parameter Study and Improvement of Gearbox Whine Noise in Electric Vehicle

Zhang¹

2018

Automot. Innov.

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Gearbox whine noise can seriously reduce the interior sound quality in an electric passenger car. In this work, a six-degree-offreedom (6-DOF) dynamic model of a helical gear system was constructed and the mechanism for generation of whine noise was analyzed. The root cause of the problem was found through noise, vibration and harshness (NVH) testing of the gearbox and the vehicle. A rigid-elastic coupling dynamics model of the reducer assembly was then developed. The accuracy of the model was then validated via modal testing. The structure-borne noise of the reducer under full acceleration conditions was predicted using the acoustic structure coupling model and the rigid-elastic coupling model of the reducer. Gear parameters including the pressure angle, the helix angle and the contact ratio were studied to determine their effects on the whine noise. Gear tooth microgeometry modification parameters were then optimized to reduce the transmission error of the first pair of meshing gears. Finally, the whine noise from the gearbox was eliminated.

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Section: Introductionmentioning

confidence: 99%

Parameter Study and Improvement of Gearbox Whine Noise in Electric Vehicle

Zhang¹

2018

Automot. Innov.

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“…6 Taking into account of the actual conditions, a type of planetary gear system in the wind turbine is studied by Yang Zhao et al 7 Through transmission system modeling, vibration magnitude prediction and whine noise improvement are presented by micro geometry optimization, and the results confirm that the noise could be reduced by 5-6 dB(A). 8 Also, a system level model is constructed for sensitivity analysis, which shows that whine noise behavior is not vulnerable to bearing preload and the torque input. 9 Based on these studies, a precise system level model of a deep hybrid transmission with compound planetary gear set could be established.…”

Section: Introductionmentioning

confidence: 99%

Precise model-based simulation for a deep hybrid transmission with compound planetary gear set

Zhang

Zou

2016

Proceedings of the IMechE

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Establishing a precise system level model for transmission system is quite necessary and feasible for today's computer technology. Taking into account of the exact parameters and actual working condition, an accurate model for a new deep hybrid transmission with compound planetary gear set is constructed, which in consideration of the gravity and centrifugal effect. The system level model contains the gears, shafts, bearings, clutches, electric motors and the housings. Few studies are found to investigate structure influence in system level for noise, vibration and harshness performance. Validation for the simulation results with test in three typical working conditions is carried out, which shows a quite well agreement. Furthermore, some parameters for this compound planetary gear set are investigated. The results show that for radial clearance between the ratchet and ring gear the smaller the better, while the axial clearance between the ratchet and ring gear requires cautious consideration to realize a better vibration performance for different planetary gear set. In the case of carrier, the radius of the connection pawl and the thickness of the carrier input shaft have remarkable influence on vibration characteristics. The vibration amplitude is the lowest when these two values equaling to 55 and 7 mm, respectively. Other than that, it is interesting to notice that the carrier position has a significant influence on the system vibration in pure electric drive mode. It is shown that if the planet carrier is fixed and sun gear rotates as input, the position of carrier should keep planet gears at high gravity center and symmetrical distribution on both sides of carrier centerline in the gravitational direction. The vibrational magnitude is the smallest as the carrier rotating 50 along z axis for this compound planetary gear set.

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