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강연준(Yeon Jun Kang),민동우(Dongwoo Min),송현진(David P. Song),김형건(Hyoung Gun Kim),조문환(Munhwan Cho) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
The purpose of this study is to optimize the acceleration operational data at suspension link pivotal point for Transfer Path Analysis (TPA). Generally, acceleration signal obtained at pivotal point contains not only fore-aft, radial, and tangential direction component but also undesirable rotational signal. An experimental approach to eliminate undesirable rotational signal is studied by adding extra accelerometer on the opposite side of where the original pivotal point acceleration is obtained. The acceleration signals at suspension link pivotal point are compared to one another then, averaged with phase. This averaged acceleration spectrum is then validated through TPA results.
노면 가진으로부터 차체로 전달되는 구조기인 힘 측정장비에 대한 연구
강연준(Yeon Jun Kang),David P. Song,민동우(Dongwoo Min) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
The primary purpose of this study is to verify the suspension force rig which is developed for structure-borne road noise analysis prior to availability of vehicle boy. With Continuous increase market of hybrid and electrical vehicle, NVH engineers endeavor to improve vehicle road noise thoroughly. However, tackling the vehicle road noise is known for one of the most difficult NVH issue until now because NVH engineers and R&H engineers must reach a compromise between quieter interior noise and crisp handling. To achieve such, identifying the body input force is crucial and thus, a suspension rig which enables direct force measurement has developed. In this paper, the suspension rig is verified through a comparative analysis with the actual baseline vehicle measureme nt with varying tire pressure, rig mass, and suspension parameters up to 300 Hz.
차대 동력계에서 자동차 구속조건에 따른 거동 특성 비교
강연준(Yeon Jun Kang),김희수(Heesoo Kim),David P. Song,민동우(Dongwoo Min) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
The primary purpose of this study is to observe the dynamic behavior within a vehicle on chassis dynamometer throughout cleat impact testing with two different constraining setups (Tie-down strap and one point fixation). Throughout this empirical experiment, no outstanding dynamic behavior characteristics are observed between two setups and thus, the performance of the one point fixation device is validated. Neither the interior noise nor acceleration at driver seat rail and knuckle is heavily influenced by two different constraining methods. However, one point fixation is far more advantageous considering its shorter set up time and its capability of measuring traction force with its built in force sensor.
Transmissibility를 이용한 Input Boundary 변화에 따른 차량 시스템의 Characteristic에 대한 연구
강연준(Yeonjune Kang),김준구(Jungu Kim),송현진(David P. Song),민동우(Dongwoo Min) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
The purpose of this study is to apply and experimentally verify the concept of the transmissibility on the vehicle system. In the study, the concept of transmissibility is applied to the vehicle cabin sound pressure and acceleration data at the knuckle of suspension. Furthermore, the systems’s transmissibility characteristics of the system are experimentally analyzed by replacing wheels and tires of a vehicle. It is also proved by the research that the transmissibility properties of the system does not change, although the input boundary of the system is changed. Additionally, the study suggests that transmissibility can be one of the parameters for evaluating the behavior of the system.