CLIMATIC & VIBRATION TESTING: NOISE, VIBRATION AND HARSHNESS
Noise cancellation and occupancy zoning provide
improved acoustic experience in electric cars
Harmonic
prominent role in addressing some of the challenges the industry faces. One company, Harman, has a long
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history in the field of acoustics and the production of sound systems and infotainment products. When electric vehicles first appeared, Harman was already working with car manufacturers on the noise profile of their products.
SOUND MANAGEMENT The core of Harman’s portfolio today is the HALOsonic suite of sound management systems, the result of significant research into road noise cancellation undertaken over five years ago with industry partners. HALOsonic comprises Engine Order Cancellation (EOC) and Electronic Sound Synthesis (ESS) to both enhance engine sound inside the vehicle (internal ESS) and
30 /// Testing & Test Houses /// December 2022
he move to electric drivetrains re- wrote the book on how engineers deal with automotive noise, vibration and harshness (NVH) with some suppliers taking a
create new sounds for hybrid and electric vehicles to comply with applicable regulations (external ESS). HALOsonic iESS enhances the driving
experience. Drivers are accustomed to the audio response of a combustion engine as they accelerate, decelerate and drive around corners, something which is missing in EV products. To improve the driving experience, this technology enables sound contouring inside the car by creating speed- and throttle-dependent sounds through the standard speaker system. The system delivers improved engine feedback, making drivers feel connected to the car they drive. HALOsonic eESS provides safety to other road users and is designed to meet legal requirements. The silence of the electric drivetrain means that pedestrians miss familiar acoustic clues warning them about an approaching vehicle. With an electric vehicle, they can no longer rely on sound to determine how fast a vehicle is
motoring
approaching and how close it is. eESS works by synthesising engine sounds with volume and pitch appropriate for the speed and direction of the vehicle. Projected forwards from speakers mounted at the front of the vehicle, this sound provides early warning to pedestrians that the car is approaching, fading away almost instantly once the vehicle has passed.
ACTIVE NOISE CONTROL Harman then went on to work with Hyundai on its Road-Noise Active Noise Control (RANC) feature, which is based on HALOsonic technology. RANC was designed to combat unwanted road noise, reducing it by up to 50 per ncent, to increase driving pleasure. The Korean manufacturer featured the technology on its Genesis GV80 SUV, launched in 2020. Harman distinguishes between sound and noise within the vehicle, asserting the former plays an essential role in the driving
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