Department News

Road noise active noise control (RANC) system commercialized for the first time in the world in partnership with Hyundai Motor Group

관리자 2019.12.04

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A road noise active noise control (RANC) system as part of research by Prof. Young-Jin Park's laboratory (System Dynamics and Applied Control Laboratory) is being implemented and commercialized in collaboration with Hyundai Motor Group. On the 11th, Hyundai Motor Group announced the world's first development of RANC, which significantly reduces road noise generated from roads and coming into the inside. RANC's core element technologies, including sensor position and signal selection methods, have already been applied for patents both in Korean and the US. As the term “road noise” implies, RANC is a technology that reduces road noise that occurs while driving. The system is composed of an acceleration sensor, digital signal processor (DSP, a control computer that analyzes acoustic signals), microphone, amplifier, and audio system. In an attempt to keep the system as simple as possible, a vehicle embedded audio system is used, instead of installing a separate one. Here is how the system works. First, the acceleration sensors are placed in the path of vibration transmission to detect any vibrations that may cause road noise. Here, determining the position of these acceleration sensors is critical so that vibration transmission can be accurately monitored. After a number of trials and tests, the research team managed to determine the optimal sensor position. This also constitutes one of the patented technologies of RANC. Prof. Park's laboratory conducted joint research with Hyundai Motor Company on finding ways to reduce road noise in an active manner for four years from the year of 1993 as part of the G7 National Project. Also, these results were published in international journals. In 2002, the journal Nature posted an article titled “Noise quietens driving” (https://www.nature.com/articles/news020121-12) on its news page, announcing that an attempt to reduce road noise in a real car test proved successful for the first time in the world. However, the absence of relevant technologies (automotive digital amplifiers, DSP, etc.), combined with price factors, led to a failure in commercialization. In 2013, Prof Park's laboratory started the relevant research with a total research fund of about 900 million won (including one technology transfer and eight industry-academia projects). Based on this effort, Hyundai's NVH Research Lab (led by Gang-deok Lee, a technical expert who received his Ph. D. in aeronautical engineering in 1996) proceeded with further research in the form of an industry-university cooperation open innovation platform while in cooperation with Optomeck (found by Prof. Kyoungsoo Kim, who received his Ph. D. in mechanical engineering in 1999), ARE (Hyounsuk Kim, CEO who received his Ph. D. in mechanical engineering in 1998), WIACOM, and BEON-YEONG in the preliminary research stage. As a result, they successfully developed the RANC system solely based on domestic technologies. In the preliminary research stage, Prof. Park's laboratory actively led the research by conducting theory-based studies and building the research team. In the commercialization phase led by Hyundai Motor Group, the team focused more on future-oriented research and played a consultative role. Hyundai Motor Group is working on the commercialization of RANC for the first time in the world by cooperating with Harman, a global automotive audio company, to perfect the system. Hyundai is applying RANC to GV80, the first SUV model of the Genesis model line-up. Prof. Park said, “As an engineer, it is delightful to see research work that was conducted during my early years in KAIST being commercialized 20 some years from then. Also, as a teacher, I am overwhelmed with joy that I can contribute my efforts to its commercialization along with some graduates from our laboratory.”