Header menu link for other important links
Impact of Powertrain Dimensional Variation on Buzz, Squeak and Rattle Noise for Cradle Type Electric Vehicle
Published in SAE International
Issue: 2021
There are two types of EV (electric vehicle) currently in use, namely modified EV and dedicated EV. Generally, we use a modified EV in cost-sensitive markets where we can commonize platform between internal combustion engine (ICE) and EV vehicles. For modified EV, we use the cradle to support the powertrain components, which connects to the engine mount, which in turn attaches to extended members and subframe. The fabricated cradle has many welding components that cause dimensional variation at the rear-mount attachment point on gearbox, which creates a reduction in the dynamic envelops significantly. The decrease in clearance often results in BSR noise, which we have simulated in the rig as well as on rope track. On a rough road, this noise is predominant. This buzz, squeak and rattle (BSR) noise also results in Tip in/Tip out noise, which is quite uncomfortable for the customer during sudden acceleration and deceleration. This paper explains in detail about the contribution of dimensional variation of the cradle and various powertrain components on the rear mount attachment point and the way to mitigate the issue. Finally, it shows that an optimized mounting system, the dimensional variation of the cradle in modified EV can result in various noise, vibration and harshness (NVH) issues if not duly addressed during packaging and dynamic envelope study. © 2021 SAE International. All Rights Reserved.
About the journal
JournalSAE Technical Papers
PublisherSAE International