Browse Publications Technical Papers 2019-01-1554

Target Development for Transmission and Electric Motor NVH 2019-01-1554

It is a common practice to conduct NVH fingerprinting and benchmarking assessments at the powertrain level, to understand source level noise and vibration. To assess the NVH influence of engine, e-motor, and transmission, sub-system testing is often conducted in addition to full powertrain testing. These powertrain or sub-system investigations provide valuable information regarding the status of “source” level excitations relative to targets and / or competitive powertrains. In the case of transmissions and e-machines, it is particularly important to understand source level tonal content and how this will be perceived at the vehicle level. However, variation in component design results in differences in order content, which complicates the process of objectively comparing multiple products.
Multiple methods are presented here for characterizing tonal content of transmission and e-machines, based on assessments conducted in a component hemi-anechoic dynamometer test cell. Ultimately, sound quality is assessed by the customer at the vehicle level. Accordingly, the methods developed incorporate means of cascading results between component level and vehicle level. Furthermore, since the perception of tonal noise content is dependent upon the masking noise present, approaches for development of masking surfaces are developed for both component-level and vehicle-level assessments.
With the information provided by these methods, educated decisions can be made regarding plans for mitigation of source NVH issues early in the development process.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Robust Design of Elastic Mounting Systems


View Details


NVH Target Cascading from Customer Interface to Vehicle Subsystems


View Details


Development of Roll Mount for the Movement Control of Powertrain and the Improvement of NVH Performance


View Details