Noise, Vibration & Harshness
Sound and harshness management technology
for perfect driving pleasure
There are times when even a small sound would rather be amplified while driving for long in a car without any window open.
The noise, vibration and harshness, also called NVH, which take away the driving pleasure are important elements to be controlled when developing a car. For this reason, auto makers put great efforts into minimizing the NVH.
Good driving experience recreated from the distracting sound and vibration
A car is a complex machine that runs on a combination of over 30 thousand parts. This is why we feel and hear various sounds and vibration from diverse parts in a car while driving. To minimize this, in the past, auto makers concentrated their efforts in blocking the sound and vibration by using acoustic materials. These days, however, the measures to minimize NVH have turned to tuning the sounds and vibrations into a pleasant experience for the driver and passengers.
Attempts for minimizing bad sound to make good sound
Especially in Asian culture, where the standard for silence is high, a quiet car is often evaluated as premium and well made. For this reason, auto makers try to curb the vibration coming from the engine and tires and to block the sounds coming from the outside of the car. However, when one excessively uses acoustic materials to cover the sound and leave alone the original source of the sound, there could be possible side effects like lowered fuel efficiency.
Hyundai Motor, to counter this issue, has applied Active Noise Control (ANC) and Active Control Mount (ACM) which help reduce unpleasant NVH while driving. These two technologies are already in use for aircraft and submarines and are called the sound technology that covers noise. In addition, Hyundai Motor has newly developed a technology called Active Sound Design (ASD). Currently under tests for commercialization, ASD enhances driving pleasure by generating sounds that well match the engine sound and car performance.
Technologies for a well-modulated car
An optimal technology that reduces sound, vibration and harshness
In order to reduce engine vibration, the biggest factor in automobile noise, Hyundai Motor has applied a three point engine mounting system. Additionally, Hyundai trimmed the design of various external parts like the mirror and applied appropriate acoustic materials fit for each element in order to block various sounds including road and wind noises. In particular, Hyundai Motor has placed a sound absorbing carpet inside the car to reduce the sound coming from the surface of the road in addition to various means that reduce the influx of the sound from the bottom of the car.
Active Noise Control (ANC)
Like how the yellow and blue colors together make green color, and red, blue, and green lights create a white light when mixed, various sounds can be mixed to make either louder or smaller sounds. Active Noise Control (ANC), developed based on this basic principle, is a type of technology that counterbalances the noise with the noise sensors. ANC would analyze the frequency, size and phase of the sound that comes into the body and sends off the counter sound waves through the speaker. Through this, the noise-minimizing components can be optimized, promoting the light freighting of the car and fuel efficiency.
A technology that makes enjoyable sounds
Active Sound Design (ASD)
Through the “Sound Design Competition” held in 2012 that created an opportunity for people outside Hyundai Motor interested in sound to design sounds to be applied in cars, Hyundai Motor has increased public awareness on the importance of sound design. In addition, the company has gathered great attention by developing Active Sound Design that allows the driver to choose the engine sound style he/she prefers. It is a cutting edge technology by which, using the sound controller established in the car, the driver can enjoy the sound appropriate for the chosen driving mode among normal, sporty and silent modes.
Virtual Engine Sound System (VESS)
Eco-friendly cars like electric vehicles, hybrid vehicles and Fuel Cell vehicles have no engine sound because they use motors instead of engines. These vehicles use a technology called Virtual Engine Sound System (VESS) to protect the pedestrians from possible car accidents. This kind of a system is necessary as these cars run without noise. VESS sends off the gasoline car engine sound via the speaker installed in the eco-friendly vehicles so that the pedestrians can reckon the vehicles.
The optimal sound design for ultimate driving pleasure
A vehicle emits various warning sounds – the opening of the vehicle door, engine sound, welcome sound, unfastened seatbelt – to alert the driver to various situations. Among these sounds, engine sound is the most critical to the driver and is the one that represents the vehicle brand. In addition, the memories registered through audio experience play a much more important role than visual memories. Enjoy Hyundai Motor’s delicate and beautiful sound design, which presents the perfect driving pleasure through the harmony of various vehicle sounds.