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황요하 한국소음진동공학회 1992 소음 진동 Vol.2 No.4
Active vibration control is presented with simulation and experiment. Dynamic Data System(DDS) method is used for system modeling and this model is combined with an forecasting control technique to derive a control equation. In the experiment, on-line digital computer monitors structural vibration and calculates control input. The control input is sent to an electromagnetic actuator which cancels the structural vibration. Experiment is performed first with a simple beam setup to demonstrate the effetiveness of this method. This method is then applied to a color laser printer to actively modify the structure. The beam experiment showed vibration reduction of over 60% with one-and two-DOF models. In the printer structure experiment, the first mode of 308 Hz was successfully controlled with a one-DOF model.
승용차용 능동제어식 현가시스템의 개발(2); 실차 성능실험 및 결과
황요하(Y.Hwang),홍예선(Y.S.Hong),이종민(J.Lee),배준영(J.Y.Bae) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Test results on prototype car equipped with active suspension system is reported. Control theory is explained first. Simulation for feasibility and parameter tuning, control module test using hydraulic exciter and test run. and performance evaluation of the test car are reported successively. Emphasis was put on modification of control theory which caused many unexpected problems in actual implementation.<br/>
전달경로의 차이를 이용한 새로운 차량용 능동 머플러의 개발
황요하(Hwang, Yo-Ha),이종민(Lee, Jong-Min),김승종(Kim, Seung-Jong) 한국소음진동공학회 2002 한국소음진동공학회 논문집 Vol.12 No.5
A new active muffler system has been developed and its superior performance on both noise reduction and engine torque increase is demonstrated with experiment. Main characteristic of the proposed muffler system is the use of destructive interference by transmission path difference of divided exhaust pipes to reduce major exhaust noise components thereby overcoming problems of other active exhaust noise control methods. The exhaust pipe is divided into two sections and joined again downstream. One divided pipe has a sliding mechanism to vary its length, which is controlled to make half wavelength transmission path difference for the major engine rpm frequency. In this system one divided pipe is used to control major rpm frequency and its Harmonics and another pipe is used to control noise component double the frequency of rpm. An after-market tuning muffler, which has very simple internal structure and minimal back pressure, is also installed to remove remaining wideband noise. To make the system to be small enough to be practical, conventional muffler is also installed and used in low rpm range and active muffler is only employed in high rpm range. Noise reduction of the proposed system is comparable to conventional passive muffler. The engine dynamo test has proved the proposed system can recover almost all the torque lost by conventional muffler.
박정훈,황요하,유홍희,Park, Jeong-Hun,Hwang, Yo-Ha,Yu, Hong-Hui 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2
This paper presents a new method for calculating contact position and contact force. The proposed method calculates accurate contact position by introducing intermediate parameters. Accurate contac t force can be obtained by solving reduced equations of motion iteratively. This method can be applied to calculate not only contact force on contact points but also contact force on kinematic joints such as a rotational joint and a translational joint. Four numerical examples are given to demonstrate the effectiveness of the proposed algorithm.