NVH & Acoustics for Hybrid & Electric Vehicles
FEA & CFD Based Simulation Design Analysis Virtual prototyping MultiObjective Optimization
The increasing powertrain electrification in hybrid and electric vehicles is leading to unique NVH challenges for OEMs and suppliers. Our Engineers solutions optimize electrical motor noise behavior while leaving electromagnetic performance unchanged. They integrate electric power sources in the driveline while ensuring smooth operation with minimum NVH impact. Our Computational tools and services help you balance NVH and ride comfort with body weight.
Sounds from an EV platform are often comparable to those in an ICE platform but especially the frequency range can be very different. EVs introduce new types of higher frequency noise sources, especially from the inverter, electric motor and battery charger and are also influenced by the use of lightweight damping material.
Electric motor noise presents its own peculiarities, since the noise emission takes place in its vibrating structure where there are internal electromagnetic forces coming out of the air space between the rotor and stator. If the frequency of the radial forces on the stator teeth are close to any of the natural frequencies of the stator frame, resonance of the stator will occur. This leads to deformation of the stator, which ultimately causes vibrations and generates the noise. Assessing the noise radiated by an electric powertrain therefore requires co-simulation analysis of structural vibrations induced by the electromagnetic forces.
In NVH Engineering and simulation of Hybrid/Electric Vehicles, the noise from tire, wind or auxiliaries, which consequently become increasingly audible due to the removal of the broadband engine masking sound, should be studied. New noise sources like tonal sounds emerge from the electro-mechanical drive systems and often have, despite their low overall noise levels, a high annoyance rating. Engine/exhaust sounds are often used to contribute to the “character” of the vehicle leads to an open question how to realize an appealing brand sound with EV.
NVH based Design and Considerations
The challenge for the NVH specialists is to support the concept and design development process by reliable recommendations just-in-time prior concept or design freeze. Enteknograte’s specialists particularly use advanced methodologies for NVH simulation and optimization:
- FEA based Powertrain
- Structural Optimization
- Optimization of Engine Dynamics based on MBD ( Multi-Body Dynamics Simulation)
- Concurrent optimization of combustion efficiency with NVH considerations
- Vehicle Interior Noise Simulation based on measurement and CAE
- Vehicle Exterior Noise Simulation with couple use of CFD and FEA solvers
- Objective Analysis of Sound Quality