Low Noise Transmissions

A characteristic of EV vehicles is their low drive-by and cabin noise. The absence of usual power train noise from EV vehicles, which would normally mask emissions from transmissions, power steering and other key systems, results in a greater focus on improving the NVH of drivelines. In particular, low transmission noise is a focus, reducing whine and rattle to a minimum. Design of low noise gear forms is a particular focus.

Drive System Design apply several levels of simulation and analysis to provide the greatest improvements in NVH. These proven techniques have placed Drive System Design as the leader in low noise transmissions.

• Complete approach to gear whine including macro and micro geometry influence on transmission error generation
  • balance gear pair stiffness
  • maximise contact ratio
  • optimise tooth face contact stress distribution
   
• Transmission error excited vibration analysis using LM Acoustic with sysnoise solver
  • transmission casing stiffness (CMS) matrix inclusion
  • differential housing stiffness (CMS) matrix inclusion
  • bearing race or sensor location acceleration measurements
   
• Analysis can be extended to include full power train model stiffness