Are Electrical Vehicles really silent ?

Electrification is a buzz word in Automotive Industries across the world since they drastically reduce the green-house emissions. Overall their motor is much quieter than that of a typical gasoline or diesel engine with absence of intake and exhaust tail pipe noises.

But still are they comfortable from point of total quietness; are they totally vibration free ?

Under heavy torque, electromagnetic forces between stator and rotors create a tonal sound from the motor-train; unless they are controlled, the EV passengers will have a harsh In-cab sound feel inside the cabin at low & mid speeds.

Added to them, tyre/ road noise and wind noise at high speeds will deprive the overall quietness of the EVs if the design rules are not followed. Driveline jerks in regenerative braking are irritating as well.

Large Electric Buses have their own challenges due to larger acoustic cavity resonance and driveline torsional vibrations.

And now EV- racing cars are coming up and vehicle designers are struggling to get their Sportive Sound at par with those of traditional powerful multi-cylinder ICE vehicles

This session should be thus perfect for Managers, Engineers and students eager to understand EV dynamics and make them comfortable against every sound & vibration sources while cruising on road with right countermeasures

1. Sound Balance difference between ICE vehicles and EVs at different speeds

2. Electromagnetic whine of motors

3. Transmission forces

4. Driveline dynamics

5. Cooling Fan noise, Battery charging , HVAC

6. Brake Vacuum pump on/off

7. Tyre/ road and wind noise

8. Electric Buses - special challenges for NVH

9. EV -racing cars and their sportive sound