Hyundai Motor develops first system of active suppression of external noise

Hyundai Motor разрабатывает первую систему активного подавления внешних шумов

The first serial car with an active “threshold” of the new generation will become the next crossover of the brand Genesis.

Modern active noise control (ANC) analyzes the intensity, frequency, and phase noise using a special sensor, mounted in the car and emits a different sound wave in antiphase via noise-canceling speaker. ANC technology is already available in some car group Hyundai Motor, however, due to limitations of the measurement and analysis of noise ANC can be used only when the noise is constant and its occurrence can be predicted. Therefore, this “noise suppressers” are often intended to neutralize the constant engine noise and other outside noises are blocked by the soundproofing and the various dampers that increase the car’s weight, and can not completely block the ultrasound.

However, engineers from Hyundai Motor have found a way to circumvent the limitations of systems such as ANC. A new system of active suppression of road noise (RANC) can analyze different types of noise in real-time and create inverse sound waves. In particular, the RANC processes resonant sounds are generated between the tires and the wheels or rumbling noises coming from the road.

The principle of operation of RANC is as follows: using the acceleration sensor, the system calculates the amount of vibration transmitted from the road car, and the control computer analyzes the road noise. For the analysis of noise and creating inverse sound waves generated by the DSP (the DSP), it takes only 0.002 seconds. A microphone continuously monitors the status of the suppression of road noise and sends the information to the DSP. RANC can conduct an accurate analysis of noise and fast calculation to suppress road noise separately for the driver, front passenger and rear passengers.

During the tests, the system APPROACH has managed to reduce the cabin noise by 3 dB compared to a conventional vehicle without active noise cancellation. This means that potentially you can reduce the car’s weight, using less acoustic parts and vibration dampers.

Research and development APPROACH for the mass production took six years. Hyundai Motor Group attracted the cooperation of Korea Institute of science and technology, startups WeAcom, ARE, BurnYoung and others. Study of acoustic characteristics of a new system of active noise control were carried out jointly with specialists of Harman, a well-known manufacturer of automotive acoustical systems.

Hyundai Motor has already submitted to the relevant organizations in South Korea and United States patent application about the location of the sensors and the way selection signal, the core technology RANC. The first cars, which will use technology RANC will be the model of the premium brand Genesis. In addition, the system of active suppression of the road will appear in future models of electric vehicles and vehicles with hydrogen fuel cells.

Hyundai Motor разрабатывает первую систему активного подавления внешних шумов

Hyundai Motor разрабатывает первую систему активного подавления внешних шумов

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