Browse Publications Technical Papers 2019-01-1554
2019-06-05

Target Development for Transmission and E-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 con-ducted in addition to full powertrain testing. These powertrain or sub-system investiga-tions provide valuable information regarding the status of “source” level excitations rela-tive 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 re-sults in differences in order content, which complicates the process of objectively com-paring 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 dy-namometer test cell. Ultimately, sound quality is assessed, by the customer, at the ve-hicle level. Accordingly, the methods developed incorporate means of cascading re-sults between component level and vehicle level. Furthermore, since the perception of tonal content is dependent upon the masking noise present, approaches for develop-ment of masking surfaces for both component-level and vehicle-level assessments. With the information provided by these methods, educated decisions can be made re-garding plans for mitigation of source issues, early in the development process.

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