Automotive Powertrain Noise, Vibration and Harshness (NVH)
Automotive powertrain Noise, Vibration and Harshness (NVH) issues are in the forefront due to the increased power output and powertrain downsizing.
In the era of powertrain downsizing and electrification there is an urgent need for robust and broadband solutions to tackle vehicle’s Noise, Vibration and Harshness (NVH). Our aim is to understand the fundamentals of powertrain NVH issues by focusing on their root causes in order to develop novel and robust design solutions for the automotive industry.
Our approach comprises:
- state of the art powertrain modelling techniques at system and component levels, involving different scales of motion and multiphysics features
- validation of the modelling outcomes by experimental measurements in situ (vehicle level) as well as in the Laboratory
The Dynamics Research Group in the Wolfson School of Mechanical, Electrical and Manufacturing Engineering at Loughborough University have many years’ of experience in studying complex automotive powertrain NVH issues. Examples of ongoing projects include the study of transient clutch dynamics, the development of nonlinear vibration absorbers for torsional oscillations, as well as the NVH of Electric Powertrains.
The Dynamics Research Group has completed numerous research projects in collaboration with various industry partners. Key research projects and related outcomes are summarised here:
- EP/L019426/1 (Targeted energy transfer in powertrains to reduce vibration-induced energy losses). Project website: http://drivetraintet.net/. The developed technology for a torsional nonlinear vibration absorber for powertrain applications is a key outcome of the project.
- EP/D050332/1 (Automotive Transmission Rattle: Root Causes to Innovative Solutions). The project established for the first time a direct link between gear rattle dynamics and the lubricant presence in the teeth contacts.
- EP/G012334/1 (Refinement of Engine in-cycle losses of Parasitic and Errant Dynamic Nature, Encyclopaedic). A comprehensive methodology to study and assess piston slapping NVH.
- EPSRC funded Doctoral Training Partnership (DTP) programme (in collaboration with industry): “Simulation of Transient Wear in Elastohydrodynamic Contacts of Gears”. (Ongoing).
- The Dynamics Research Group has also collaborated with various industrial partners through research as well as enterprise routes. Examples of projects and published work include:
- Behaviour of rolling element bearings under ultra-high speed conditions of electrified powertrains.
- NVH refinement of electrified dual-clutch transmission for luxury passenger cars
- Numerical analysis of air foil bearings for high speed applications
- Noise, vibration and harshness during dry clutch engagement oscillations
- Effect of teeth micro-geometrical form modification on contact kinematics and efficiency of high performance transmissions
- Axle whine phenomenon in light trucks: a combined numerical and experimental investigation