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Random forests classifier for machine fault diagnosis
양보석,Xiao Di,Tian Han 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.9
This paper investigates the possibilities of applying the random forests algorithm (RF) in machine fault diagnosis, and proposes a hybrid method combined with genetic algorithm to improve the classification accuracy. The proposed method is based on RF, a novel ensemble classifier which builds a number of decision trees to improve the single tree classifier. Although there are several existing techniques for faults diagnosis, the application research on RF is meaningful and necessary because of its fast execution speed, the characteristics of tree classifier, and high performance in machine faults diagnosis. The proposed method is demonstrated by a case study on induction motor fault diagnosis. Experimental results indicate the validity and reliability of RF-based diagnosis method.
양보석,복정희일랑,암호탁삼 대한기계학회 1992 대한기계학회논문집 Vol.16 No.7
This paper presents a dynamic characteristics of flow induced vibration of circular cylinder set with inclined angle against flow direction. The effect of the cylinder bounded by spiral fin and wire on the damping of flow induced vibration is investigated, i.e., inclined angle, spiral pitch angle and number of spiral thread are studied. As the results, the cylinder with spiral fin is most effective for the damping. Also the cylinder bounded by pitch angle 50.deg. and 2 spiral thread is most effective. 본 연구에서는 경사원주에서 발생하는 소용돌이 여기진동을 억제하기 위한 방 법으로 원주구조물 주위에서 발생하는 규칙적인 소용돌이 방출에 의한 여진력을 감소 시키도록 원주표면에 fin이나 wire를 부착시켜 단면형상을 바꾸는 방안을 실험적으로 검토한다. 즉, 밀폐순환식 유로을 이용하여 흐름에 경사되도록 탄성지지된 원주에 나선상의 fin과 wire를 감아, 경사각(.theta.)을 45, 60, 75, 90도, 나선피치각(.alpha.)을 30, 35, 40, 45, 50, 55, 60도, 나선권수(n)를 1,2,3으로 하여, 진동특성을 실험적으로 조사하고, plain원주와 비교하여 제진효과를 확인하며, 더우기 나선핀 원주의 최적형 상을 구하는 것을 목적으로 한다.
양보석,김병욱,김용한 한국소음진동공학회 1999 소음 진동 Vol.9 No.4
This paper presents the technique using wavelet analysis to solve the seismic response of a steam turbine-generator rotor system subjected to earthquake excitations. A brief review of the wavelet transform and its discretization, time-frequency representation of the earthquake wave and the seismic response for a rotor system is presented. The Daubechies wavelet has been used for describing the time-frequency characteristics of the input and the response in case of a recorded accelerogram during 1995 Hyogoken Nanbu earthquake. Also, the results in the wavelet domain has been illustrated through comparison with the time domain simulation results.
증기터빈$\cdot$발전기축계의 지진응답해석(제 1 보, 로터$\cdot$베어링시스템만을 고려한 경우)
양보석,김용한 한국소음진동공학회 1999 소음 진동 Vol.9 No.3
This paper presents the analytical method to evaluate the seismic responses on steam turbine-generator rotor system. Deterministic analytical methods, such as response spectrum approach, modal superposition method and direct integration method, are used to calculate the seismic response. The computer software is also developed based on the methods then can be applied to estimate the seismic safety of turbine-generator rotor system for power plants. Numerical example of a steam turbine-generator rotor system of 1007MW nuclear power plant is presented. The aseismatic performance are checked by comparing maximum seismic deflection at bearing positions with bearing clearance.