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가속도 바이어스와 타이어반경 오차를 고려한 차량절대속도 추정
황진권(Jin Kwon Hwang),송철기(Chui Ki Song) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.6
This paper treats the problem of estimating the longitudinal velocity of a braking vehicle using measurements from an accelerometer and wheel speed data from standard anti-lock braking wheel speed sensors. We develop and experimentally test three velocity estimation algorithms of increasing complexity. The algorithm that works the best gives peak errors of less than 3 percent even when the accelerometer signal is significantly biased.<br/>
송철기(Chul Ki Song),황진권(Jin Kwon Hwang),J.K. Hedrick 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.1
The absolute longitudinal speed of a vehicle is estimated by using vehicle acceleration data from an accelerometer and wheel speed data from standard 50-tooth antilock braking system wheel speed sensors. An intuitive solution to this problem is, When wheel slip is low, calculate absolute velocities from the wheel speeds; when wheel slip is high, calculate absolute velocity by integrating the accelerometer. Fuzzy logic is introduced to implement the above idea and a new algorithm of modified velocities with step integration is proposed. This algorithm is verified experimentally to estimate speed of a vehicle, and is also shown to estimate absolute longitudinal vehicle speed with a 6% worst-case error during a hard braking maneuver lasting three seconds.
송철기(Chul Ki Song),황진권(Jin Kwon Hwang),이장무(Jang Moo Lee) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.2
This paper presents active structural-acoustic control using piezoelectric materials. The structural-acoustic coupled system of a 3-D vehicle model was analyzed by combining the structural data which were obtained by modal testing with the acoustic data which were obtained by finite element method. Through the contribution analysis of the coupled system for its interior noise, a controlled plate and controlled modes were selected, which were most effective for reducing its noise. Interior noise as well as structural vibration could be reduced by using a robust LQG controller of vibration considering cavity acoustics.<br/>