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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/>
승용차용 능동제어식 현가시스템의 개발(1); 실험차량의 구성
홍예선(Y.S. Hong),황요하(Y. Hwang),김동윤(D.Y.Kim),김영범(Y.B.Kim),심재진(J.JShim) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Low-band type active suspension system is implemented on a passenger car. Level. roll. pitch and bouncing motion of body is controlled by a digital controller. Sky-hook damper is applied to control bouncing motion. This paper describes overall construction of the system. design of hydraulic system. sensor system. controller and control scheme. Performance of prototype car has been evaluated on a test track and reported in second paper.<br/>
열차 동역학에서 기구학적 비연성을 이용한 분할 해석 방법
박정훈,유홍희,황요하,김창호,Park, J.H.,Yoo, H.H.,Hwang, Y.H.,Kim, C.H. 한국철도학회 1999 한국철도학회논문집 Vol.2 No.1
In this paper, an efficient and accurate formulation for the transient analysis of constrained multibody systems is presented. The formulation employs Kane's method along with the null space method. Kane's method reduces the dimension of equations of motion by using partial velocity matrix: it can improve the efficiency of the formulation. Furthermore, the formulation partitions the coefficient matrix of linear and nonlinear equations into several sub-matrices using kinematic uncoupling. This can solve the equations more efficiently. The proposed formulation can be used to perform dynamic analysis of systems which can be partitioned into several sub-systems such as train systems. One numerical example is given to demonstrate the efficiency and accuracy of the formulation, and another numerical example is given to show its application to the train systems.
은닉 마르코프 모델을 이용한 속도 변화가 있는 회전 기계의 상태 진단 기법
장미(Jang, M.),이종민(Lee, J.M.),황요하(Hwang, Y.),조유종(Cho, Y.J.),송재복(Song, J.B.) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.5
In industry, various rotating machinery such as pumps, gas turbines, compressors, electric motors, generators are being used as an important facility. Due to the industrial development, they make high performance(high-speed, high-pressure). As a result, we need more intelligent and reliable machine condition diagnosis techniques. Diagnosis technique using hidden Markov-model is proposed for an accurate and predictable condition diagnosis of various rotating machines and also has overcame the speed limitation of time/frequency method by using compensation of the rotational speed of rotor. In addition, existing artificial intelligence method needs defect state data for fault detection. hidden Markov model can overcome this limitation by using normal state data alone to detect fault of rotational machinery. Vibration analysis of step-up gearbox for wind turbine was applied to the study to ensure the robustness of diagnostic performance about compensation of the rotational speed. To assure the performance of normal state alone method, hidden Markov model was applied to experimental torque measuring gearbox in this study.